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1. general description the greenchip is the latest generation of green switched mode power supply (smps) controller ics. the SSL8516BT combines a controller for power factor correction (pfc) and a flyback controller. its high level of integration enables cost-effective led lighting application power supply design using a very low number of external components. the pfc operates in quasi-resonant (qr) or discontinuous conduction mode (dcm), with valley switching. the specially built-in green fu nctions provide high efficiency at all power levels. at high power levels, the flyback operates in qr mode or dcm with valley detection. at medium power levels, the flyback controller switches to frequency reduction (fr) mode and limits the peak current to an adjustable minimum value. in low-power mode, the pfc switches off to maintain high efficiency. at very low power levels, when the flyback switching frequency drops to below 25 khz, the flyback converter switches to burst mode. during the non-switching phase of the burst mode, the internal ic supply current is minimized to optimize efficiency further. valley swit ching is used in all operating modes. the advanced burst mode ensures high effi ciency at low power and good standby power performance while minimizing audible transformer noise. the SSL8516BT is a multi-chip module (mcm), containing two chips. the proprietary high-voltage bcd800 process makes direct start- up possible from the rectified universal mains voltage in an effective and green way. the second low volta ge silicon-on-insulator (soi) is used for accurate, high-speed protection functions and control. the SSL8516BT enables easy design of highly efficient and reliable led lighting application power supplies between 25 w and 300 w. led drivers in particular benefit from the high level of integration. the ic meets the lighting class c requirements on mains current harmonics as specified by iec 61000-3-2 over a wide input voltage range and a wide output power range. remark: all values in this document are typical values unless otherwise stated. SSL8516BT greenchip pfc and flyback controller rev. 1 ? 26 may 2015 product data sheet
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 2 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 2. features and benefits 2.1 distinctive features ? integrated pfc and flyback controller ? universal mains supply operat ion between 90 v (ac) to 305 v (ac) ? fixed boost pfc with accurate maximum output voltage (nxp semiconductors patented) ? high level of integration, re sults in cost-effective designs with very low external component counts ? adjustable pfc switch off delay ? external pfc switch on and switch off override ? accurate pfc switch on and switch off control (nxp semiconductors patents: ep2566024a1, us20130057170, cn102969909 a) 2.2 green features ? on-chip start-up current source ? reduced ic supply current during burst mode ? power-down functionality for very low standby power 2.3 pfc green features ? valley/zero-voltage switching (zvs) for minimum switching losses (nxp semiconductors patented) ? frequency limitation re duces switching losses ? pfc switched off when a low-load is detected at the flyback output 2.4 flyback green features ? valley switching for minimum switching losses (nxp semiconductors patented) ? frequency reduction with adjustable minimu m peak current at low-power operation maintains high-efficiency at low output power levels ? burst mode operation at very low-power levels for high-efficiency operation 2.5 protection features ? safe restart mode for system fault conditions ? continuous mode protection using demagn etization detection for both converters (nxp semiconductors patented) ? undervoltage protection (uvp) (foldback during overload) ? accurate overvoltage protection (ovp) for both converters (adjustable for flyback converter) ? mains voltage independent overpower protection (opp) ? open control loop protection for both converters. the open-loop protection on the flyback converter is safe restart ? overtemperature protection (otp) ? low and adjustable overcurrent protection (ocp) trip level for both converters
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 3 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller ? general-purpose input for latched protection, for use with system overtemperature protection (otp) 3. applications ? this ic can be used in all lighting applicat ions requiring efficient and cost-effective ac-dc offline switch mode power solutions from 25 w to 300 w. 4. ordering information 5. block diagram table 1. ordering information type number package name description version SSL8516BT so16 plastic small outline package; 16 leads; body width 3.9 mm sot109-1 fig 1. SSL8516BT block diagram 7,0(5?v 7,0(5?v 3)& surwhfwlrq 9 r 293 9 wk926(16( w rq 5('8&7,21 1($5293 2&3 3)&gulyhu hqdeoh3)& vwduwvwrs3)& p9 3)&jdwh 9$//(< '(7(&7 %/$1. 9 9 9 0$;,080 h[whuqdosurwhfwlrq surwhfwlrq h[whuqdosurwhfwlrq 9 vwduwxs &+$5*( &21752/ 6$)( 5(67$57 3527(&7,21 vwduwio\edfn vwduwvwrs3)& surwhfwlrq 9 && jrrg fkdujh 3)& surwhfwlrq surwhfwlrq odwfk uhvhw hqdeoh3)& 5 6 4 orzsrzhughod\ 3)&fodps 6036 &21752/ 9 && jrrg exuvwprgh 9 surw89/2 67$57 62)7 vwduwio\edfn hqdeohio\edfn hqdeohio\edfn %/$1. 4 5 6 )/<%$&. 26&,//$725 w rqiepd[ iuhtxhqf\ uhgxfwlrq h[whuqdo surwhfwlrq wlphrxw exuvwprgh io\edfngulyhu io\edfnjdwh 3)&gulyhu 3)&jdwh 9,16(16( 3)&&203 9 26(16( 3)&6(16( 3)&$8; 273 273 293io\edfn fkdujh 9$//(< '(7(&7 273 lqwhuqdovxsso\ =(52&855(17 6,*1$/ =(52 &855(17 6,*1$/ io\edfn jdwh )%$8 ; )%6(16( &2817(5 293 293 io\edfn 9 +9 9 && *1' )%&75/ /$ 7&+ p9 3)&'5,9(5 )%'5,9(5 9 vwduwxs 9 wk89/2 9 wk89/2 ddd surwhfwlrq 3)&vzrq 3)&vzrii &21752/ ?$ ?$ ?$ 9 fodps 2&3 iuhtxhqf\ uhgxfwlrq exuvwprgh p9 9 surw89/2 io\edfngulyhu 9 9 7(03(5$785( p9 orz 9 lq orz9lq srzhu grzq w rqiepd[ srzhugrzq srzhugrzq 233 233 233 0,1,080 orzsrzhu ghod\ orzsrzhu 3)&7,0(5 '(/$< ?$ ?$ h[whuqdosurwhfwlrq odwfkuhvhw 6 5 /$7&+(' 3527(&7,21 3)&fodps fodps 62)767$57 62)76723 9 hq3)&)%&75/ orzsrzhu ghod\ wlphrxw 5 6 6 6 6 6 9 wk926(16( orz9lq 9 wk89/2 gulyhu gulyhu 3)& 26&,//$725 orzsrzhu 9 hq3)&)%&75/
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 4 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 6. pinning information 6.1 pinning 6.2 pin description fig 2. SSL8516BT pin configuration (sot109-1) ,& 9 && +9 *1' +96 )%&75/ 3)&7,0(5 )%$8; )%'5,9(5 /$7&+ 3)&'5,9(5 3)&&203 3)&6(16( 9,16(16( )%6(16( 3)&$8; 926(16( ddd table 2. pin description symbol pin description v cc 1 supply voltage gnd 2 ground fbctrl 3 flyback control input fbaux 4 auxiliary winding input for demagnetization timing and flyback ovp latch 5 general-purpose protection input pfccomp 6 pfc frequency compensation vinsense 7 mains voltage sense input pfcaux 8 auxiliary winding input for demagnetization timing of the pfc vosense 9 sense input for pfc output voltage fbsense 10 flyback current sense input pfcsense 11 pfc current sense input pfcdriver 12 pfc gate-driver output fbdriver 13 flyback gate-driver output pfctimer 14 pfc override and switch-off delay timer hvs 15 high-voltage safety spacer; not connected hv 16 high-voltage start-up and flyback valley sensing
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 5 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7. functional description 7.1 general control the SSL8516BT contains a power factor correction circuit controller and a flyback circuit controller. a typical conf iguration is shown in figure 3 . 7.1.1 start-up and undervoltage lockout (uvlo) initially, the capacitor on the v cc pin is charged from the high-voltage mains using the hv pin. when v cc is less than v trip , the charge current is i ch(low) . this low current protects the ic if the v cc pin is shorted to ground. to ensure a s hort start-up time, the charge current above the v trip level is increased to i ch(high) , until v cc reaches v startup . except during start-up, when v cc is between v th(uvlo) and v startup , the charge current becomes i ch(low) to ensure a low safe restart duty cycle during fault conditions. when v cc is lowered to 2 v, the ic is reset. du ring the next start-up, the charge current between v th(uvlo) and v startup is i ch(high) . (1) the hv pin can either be connected to the center tap of the flyback transformer or to the drain of mosfet s2. fig 3. a typical SSL8516BT configuration ddd 7u & ' 5 5 5 /223 5 5 & & 7,0(287 & 3)&7,0(5 5 17& & ' & & 9&& & & 5 & 7+' 5 $8; 5 9pdlqv 3)&&203 3)&$8; ,& 9,16(16( )%&75/ )%$8; )%6(16( 9&& /$7&+ *1' 3)&7,0(5 3)&'5,9(5 3)&6(16( 926(16( +9 )%'5,9(5 5 6(16( 5 &203 7 u 5 4 5 5 5 5 5 8 & ,& ' & 287 /2$' 6 6 ' 5 66 5 '59 5 6 & 66 5 5 '59 5 )%$8; 5 6(16( 5 6 5 66 & 66 5 6 5 & exon 5
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 6 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller the control logic activates the internal circui try and switches off the hv charge current when v cc passes the v startup level. first, the latch pin cu rrent source is activated and the soft-start capacitors on the pfcsense and fbsense pins are charged. also the clamp circuit on the pfccomp pin is activated. the pfc circuit is activated when the following conditions are met: ? the latch pin voltage exceeds the v en(latch) voltage ? the pfccomp pin charging current drops below the absolute value of the i en(pfccomp) current ? the soft-start capacitor on the pfcsense pin is charged if the soft-start capacitor on the fbsense pin is charged, the flyback converter is activated. the flyback converter output volt age is then regulated to its nominal output voltage. the auxiliary winding of the fly back converter takes ov er the ic supply (see figure 4 ). if during start-up, the latch pin does not reach the v en(latch) level before v cc reaches v th(uvlo) , the latch pin output is deactivated. th e charge current is switched on again. when the flyback converter is started, v fbctrl is monitored. if the output voltage does not reach its intended regulation le vel within a specified time, v fbctrl reaches the v to(fbctrl) level. an error is then assumed and a safe restart is initiated. when one of the safe restart or latched protection functions are triggered, both converters stop switching and the v cc voltage drops to v th(uvlo) . a latched protection recharges capacitor c vcc using i ch(low) from the hv pin, but does not restart the converters. to provide safe restart protection, the capacitor is recharged using i ch(low) from the hv pin and the device restarts (see figure 1 ). if ovp is triggered on the pfc circuit (v vosense >v ovp(vosense) ), the pfc controller stops switching until the v vosense < v ovp(vosense) . if a mains uvp is detected, v vinsense v start(vinsense) again. ovp and uvp of the pfc circuit do not disable flyback controller switching. when the v cc pin voltage drops under the uvlo level, both controllers stop switching and enter safe restart mode. in the safe restart mode, the v cc pin capacitor is recharged using i ch(low) from the hv pin. at very low burst mode repetition rates, v cc can drop to below the uvlo level. the uvlo protection feature v prot(uvlo) prevents the decrease when the ic is in burst mode.
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 7 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.1.2 power-down mode the power-down mode can be activated for very low standby power applications by pulling the v vinsense < v th(pd) level. the SSL8516BT stops switching and safe restart protection is activated. the high-voltage star t-up current source is also disabled during power-down and the SSL8516BT does not restart until v vinsense is raised again. during power-down mode, all internal circuitry is disabled except for a voltage detection circuit on the vinsense pin. this circuit is supplied by the hv pin and draws 12 ? a from the hv pin for biasing. the protection signal resembles an imaginary protection trigger. fig 4. start-up sequence, normal operation and restart sequence 9 && /$7&+ 35 27(&7,21 3)&6(16( 3)&'5,9(5 )%6(16( )%'5,9(5 )%&75/ 926(16( 9 2 fkdujlqj9&& fdsdflwru vwduwlqj frqyhuwhuv qrupdo rshudwlrq surwhfwlrq uhvwduw vriwvwduw vriwvwduw , +9 9 vwdu w9,16(16( 9 wr)%&75/ 9 vwduwxs 9 wk89/2 9 wuls 9 hq/$ 7&+ 9 wkvwduw926(16( 9,16(16( ddd 3)&&203 9 hq3)&&203
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 8 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.1.3 supply management all internal reference voltages are derived from a temperature compensated and trimmed on-chip band gap circuit. internal reference currents are derived from a temperature compensated and trimmed on-chip current reference circuit. 7.1.4 latch input the latch pin is a general-purpose input pin wh ich is used to switch off both converters. the pin sources a current i o(latch) of 30.5 ? a. switching of both converters is stopped when v latch is < 494 mv. a latched protection is tr iggered. it can be reset by removing the voltage from both the v cc and hv pins or by the fast latch reset function (see section 7.1.5 ). at initial start-up, switching is prevented until the capacitor on the latch pin is charged above 582 mv. no internal filtering is performed on this pin. an internal 1.75 v clamp protects the pin from excessive voltages. 7.1.5 fast latch reset in a typical application, the mains can be interrupted briefly to reset the latched protection. the bulk capacitor c bulk does not have to discharge for th is latched protection to reset. when the vinsense voltage drops below 750 mv and is then raised to 860 mv, the latched protection is reset. the latched protection is also reset by removing both the voltage on the v cc and hv pins. 7.1.6 overtemperature protection an accurate internal temperature protection is provided in the ic. when the junction temperature exceeds the thermal shut-down te mperature, the ic stop s switching. while otp is active, the capacitor c vcc is not recharged from the hv mains. if the v cc supply voltage is not sufficient, the otp circuit is supplied from the hv pin. otp is a safe restart protection. 7.2 power factor correction circuit the power factor correction (pfc) circuit operates in quasi-resonant (qr) or discontinuous conduction mode (dcm) with valle y switching. the next primary stroke is only started when the previous secondary stroke has ended and the voltage across the pfc mosfet has reached the minimum value. v pfcaux is used to detect transformer demagn etization and the minimum voltage across the external pfc mosfet switch. 7.2.1 t on control (pfccomp pin) the power factor correction circuit is operated in t on control. the resulting mains harmonic reduction is well within the cl ass-c lighting requirements. v pfccomp determines the on-time of the pfc. the v vosense is the transconductance amplifier input which outputs current to the pfccomp pin. the regulation v vosense = 2.5 v. the network connected to the pfccomp pin and the transconductance amplifier determine the dynamic behavior of the pfc control.
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 9 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller operating near the pfc ovp level causes th e pfc stage on-time to decrease rapidly to zero. to reduce the response time, in case of load variation, the pfccomp pin is clamped to a minimum level of 1.19 v during pfc operation. clamping prevents the on-time increasing too much and improves the pfc response time when the load decreases again. 7.2.2 valley switching and demagnetization (pfcaux pin) the pfc mosfet is switched on after the trans former is demagnetized. internal circuitry connected to the pfcaux pin detects the end of the secondary stroke. it also detects the voltage across the pfc mosfet. to reduce switching losses and electromagnetic interference (emi), the next stroke is started when the voltage across the pfc mosfet is at its minimum (valley switching). if a demagnetization signal is not detected on the pfcaux pin, the controller generates a zero-current signal (zcs) 48 ? s after the last pfc mosfet gate signal. if valley signal is not detected on the pfcaux pin, the controller generates a valley signal 4.2 ? s after demagnetization is detected. to protect the internal circuitry during, for example, lightning events, add a 5 k ? series resistor to the pfcaux pin. to prevent inco rrect switching due to external interference, place the resistor close to the ic on the pcb. 7.2.3 frequency limitation to optimize the transformer and minimize s witching losses, the s witching frequency is limited to f sw(pfc)max . if the frequency for quasi-res onant operation is above the f sw(pfc)max limit, the system switches to dcm. the pfc mosfet is only switched on at a minimum voltage across the switch (valley switching). 7.2.4 mains voltage compensation (vinsense pin) the equation for the transfer function of a power factor corrector contains the square of the mains input voltage. in a ty pical application, it results in a low bandwidth for low mains input voltages. to compensate for the influence of the mains input voltage, the SSL8516BT contains a correction circuit. the average input volt age is measured using the vinsense pin and the information is fed to an internal compen sation circuit. using this compensation, it is possible to keep the regulation loop bandwidth constant over the mains input range. this feature gives a fast transient response on load steps while complying with class-c mhr requirements. in a typical application, a resistor and two capacitors connected to the pfccomp pin set the regulation loop bandwidth.
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 10 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.2.5 soft-start (pfcsense pin) to prevent audible transformer noise at start-up or during hiccup, the soft-start function slowly increases the transformer peak current. to implement a soft-start function, place a capacitor c ss1 in parallel with resistor r ss1 (see figure 5 ). an internal current source charges the capacitor to: (1) the voltage is limited to v start(soft)pfc . the start level and time constant of the incr easing primary current level is externally adjusted by changing the r ss1 and c ss1 values. (2) the charging current i start(soft)pfc flows while the pfcsense pin voltage is < 0.5 v. if v pfcsense exceeds 0.5 v, the soft-start current source starts limiting current i start(soft)pfc . when the pfc starts switching, the i start(soft)pfc current source is switched off; see figure 5 . 7.2.6 pfc switch-on/switch-off control when the flyback converter output power (see section 7.3 ) is low, the flyback converter switches to fr mode. when the switching frequency of the flyback in fr mode < f sw(fb)swoff(pfc) (53 khz), the pfc circuit is switched off to maintain high efficiency. to delay the pfc s witching off, connect a capaci tor to the pfctimer pin (see section 7.2.7 ). during low-power mode operation and start-up (when pfc is disabled, e.g. at no-load), the pfccomp pin is clamped to a minimum voltage of 3.32 v or 1.18 v and a maximum voltage of 3.75 v. the minimum clamp voltage depends on v vinsense . this voltage limits the maximum power that is de livered when the pfc switches on again. the upper clamp voltage ensures that the pfc re turns from low-power mode to its normal regulation point in a limited time. in fr mode, when the flyback co nverter switching frequency exceeds f sw(fb)swon(pfc) (73 khz), the pfc circuit is switched on . if the flyback converter duty cycle is > 50 % or v fbctrl is > 3.75 v, the pfc circuit is also switched on. fig 5. soft start of the pfc v pfcsense i start soft ?? pfc r ss1 ? = ? start soft ?? pfc 3r ss1 c ss1 ?? = 62)767$57 62)76723 &21752/ 2&3 3)&6(16( p9 , vwduwvriw3)& ? $ 6 5 66 & 66 5 6(16( ddd
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 11 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.2.7 pfc switch off delay (pfctimer pin) when the flyback converter switching frequency in fr mode is < f sw(fb)swoff(pfc) (53 khz), the ic then outputs a 4.7 ? a current to the pfctimer pin. when v pfctimer reaches 3 v, the pfc is switched off by performing a soft-stop. a switch discharges the pfctimer pin capa citor when the flyback controller operating frequency is > f sw(fb)swon(pfc) (73 khz). at the same moment, the pfc stage is also switched on. to prevent that the pfc from switches off because of a dynamic load that leads to repetitive crossing of f sw(fb)swoff(pfc) and f sw(fb)swon(pfc) , connect a capacitor to the pfctimer pin (see section 7.2.7 ). a 1 nf minimum capacitor value is recommended to prevent noise influencing the pfc switch on/ switch off behavior. the pfctimer pin capacitor is also discharged when pfc is on and the flyback switching frequency is higher than 53 khz. this feature prevents pfc on/off toggling during dynamic loads causing the flyb ack to operate repetitively near f sw(fb)swoff(pfc) and f sw(fb)swon(pfc) . it is also possible to control pfc swit ch-on and switch off externally. when v pfctimer is driven below 1.03 v, the pfc stage is on. when the pfctimer pin voltage is driven above 4.4 v, the pfc stage is switched off. the external control overrides the pfc stage control by the flyback controller (see figure 6 ). the pfctimer pin has an internal clamp circuit starting around 10 v with a current capability of 0.1 ma 7.2.8 overcurrent protection (pfcsense pin) the maximum peak current is limited cycle-by-c ycle by sensing the voltage across an external sense resistor, r sense1 , on the source of the external mosfet. the voltage is measured using the pfcsense pin. fig 6. pfc switch on and switch off using the pfctimer pin ddd ?$ orzsrzhu 5 6 4 9 9 3)&7,0(5 9 5 6 4 n orzsrzhughod\ 3)&rq
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 12 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.2.9 mains undervoltage lockout/brownout protection (vinsense pin) to prevent the pfc from operating at very low mains input voltages, v vinsense is sensed continuously. when v vinsense drops below the v stop(vinsense) level, switching of the pfc is stopped. 7.2.10 overvoltage protection (vosense pin) to prevent output overvoltage during load steps and mains transients, an overvoltage protection circuit is built in. when v vosense exceeds the v ovp(vosense) level, switching of the pfc circuit is prevented. switching of the pfc restarts when the vosense pin voltage drops below the v ovp(vosense) level again. ovp is also triggered when the resistor between the vosense pin and ground is open. 7.2.11 pfc open-loop protection (vosense pin) the pfc circuit does not start switching until the v vosense pin is greater than the v th(start)(vosense) level. this feature protects the application from open-loop and vosense short-circuit situations. 7.2.12 driver (pfcdriver pin) the driver circuit to the gate of the power mosfet includes a curr ent sourcing capability of 500 ma at 2 v on the pfcdriver pin. it also includes a current sink capability of 1.2 a at 10 v on the pfcdriver pin. these capabilitie s ensure fast switch-o n and switch-off of the power mosfet for efficient operation. 7.3 flyback controller the SSL8516BT includes a controller for a flyback converter. the flyback converter operates in quasi-resonant or discontinuous conduction mode or burst mode with valley switching. the auxiliary winding of the fl yback transformer provides demagnetization detection and powers the ic after start-up. 7.3.1 multimode operation the SSL8516BT flyback controller can operate in several modes; see figure 7 .
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 13 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller at high output power the co nverter switches to quasi-resonant mode. the next converter stroke starts after demagnetization of the transformer and detection of the valley. in quasi-resonant mode, switching losses are mini mized. this minimiza tion is achieved by the converter only switching on when the voltag e across the external mosfet is at its minimum (see section 7.3.2 ). valley switching is active in all operating modes. to prevent high frequency operation at lower loads, the quasi-resona nt operation switches to discontinuous mode operation with valley skipping. when the frequency limit is reached, the quasi-resonant operation changes to dcm with valley skipping. the frequency limit reduces the mosfet switch-on losses and conducted emi. at medium power levels, the controller enters frequency reduction (fr) mode. a voltage controlled oscillato r (vco) controls the fr equency. the mini mum frequency in this mode is reduced to approximately 25 khz. during frequency reduction mode, the primary peak current is kept at an adjustable minimum level to maintain a high efficiency. valley switching is also active in this mode. at very low power and standby levels, for which the switching frequency drops to below 25 khz, the converter enters the burst mode. in burst mode, the switching frequency is 36.5 khz. the primary peak current is fixed in burst mode. in frequency reduction mode, the pfc controlle r switches off when the flyback switching frequency has dropped to below 53 khz and v pfctimer has reached 3 v. the flyback maximum frequency changes linearly with the control v fbctrl (see figure 8 ). hysteresis is added to ensure a stable pfc switch-on and switch-off. in no-load operation, the switching frequency is re duced to (almost) zero. fig 7. multimode operation flyback glvfrqwlqxrxv zlwkydooh\ vzlwfklqj txdvluhvrqdqw iuhtxhqf\ uhgxfwlrq rxwsxwsrzhu io\edfn vzlwfklqj iuhtxhqf\ ddd 3)&rii 3)&rq n+] n+] n+] n+] n+] , splq dgmxvw exuvwprgh
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 14 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.2 valley switching (hv pin) a new cycle starts when the exte rnal mosfet is switched on. v fbsense and v fbctrl determine the on-time. the mosfet is then switched off and the secondary stroke starts (see figure 9 ). after the secondary stroke, the dr ain voltage shows an oscillation with a frequency of approximately: (3) where l p is the primary self-inductance of the flyback transformer and c d is the capacitance on the drain node. when the secondary stro ke ends and the internal oscillator voltage is high again, the circuit waits for the lowest drain voltage before starting a new primary stroke. figure 9 shows the drain voltage, valley signal, secondary stroke signal and the internal oscillator signal. valley switching allows high frequency operat ion because capacitive switching losses are reduced (see equation 4 ). high frequency operation makes small and cost-effective magnetic components possible. (4) fig 8. flyback frequency control ddd 9 )%&75/ 9 3)&rii 3)&rq io\edfn vzlwfklqj iuhtxhqf\ i vziepd[ exuvwprgh iuhtxhqf\ )5plqlpxp iuhtxhqf\ )5 '&0 45 %0 454xdvl5hvrqdqw '&0'lvfrqwlqxrxv&rqgxfwlrq0r gh )5)uhtxhqf\5hgxfwlrq %0%xuvw0rgh f 1 2 ?? l p c d ? ?? ? ?? -------------------------------------------------- - = p 1 2 -- - c d v 2 ? f ?? =
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 15 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.3 current mode control (fbsense pin) current mode control is used for the flyback converter because of its good line regulation. the fbsense pin senses the primary current acro ss an external resist or and compares it to an internal control voltage. the internal control voltage is proportional to v fbctrl (see figure 10 ). the fbsense pin output s a current of 2.1 ? a. this current runs through the resistors from the fbsense pin to the sense resistor r sense2 and creates an offset voltage. resistor r ss2 causes the offset voltage because r sense2 is relatively small. the minimum flyback peak current is adjusted using this offset voltage. adjusting the minimum peak current level, changes the frequency reduction slope (see figure 7 ). (1) start of a new cycle at lowest drain voltage. (2) start of a new cycle in a classical pulse-widt h modulation (pwm) system without valley detection. fig 9. signals for valley switching gudlq vhfrqgdu\ vwurnh ddd vhfrqgdu\ ulqjlqj sulpdu\ vwurnh ydooh\ vhfrqgdu\ vwurnh rvfloodwru
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 16 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.4 demagnetization (fbaux pin) the system is always in qr or dcm. the internal oscillator does not start a new primary stroke until the previous secondary stroke has ended. demagnetization features a cycl e-by-cycle output short-circuit protection by immediately lowering the frequency (longer off-time) and reducing the power level. demagnetization recognition is suppressed during the first t sup(xfmr_ring) time of 2.2 ? s. this suppression can be necessary at low output voltages, during start-up and in applications where the transformer has a large leakage inductance. if the fbaux pin is open-circuit or not connec ted, a fault condition is assumed and the converter immediately stops. operation rest arts when the fault condition is removed. 7.3.5 flyback control/time-out (fbctrl pin) the fbctrl pin is connected to an internal voltage source of 7 v using an internal 13.2 k ? resistor. when v fbctrl > 5.5 v, the resistor is disconnected. the pin is biased with a 29 ? a current. when v fbctrl > 7.75 v, a fault is assume d, switching is stopped and a restart is made. if a capacitor and resistor are connected in seri es to the pin, a time-out function is created which protects against open control loop situations. see figure 11 and figure 12 . the time-out function is disabled by connecting a resistor (200 k ? ) to ground on the fbctrl pin. if the pin is short-circuited to ground, swit ching of the flyback controller is stopped. under normal operating conditions, the converter regulates the output voltage. v fbctrl varies between 0.77 v at minimum output power and 4.9 v at maximum output power. fig 10. flyback part peak current control 9 )%&75/ 9 p9 p9 io\edfn )5prgh 3)&rii3)&rq ddd 6(16(uhvlvwru shdnyrowdjh )%6(16 ( riivhwyr owdjh 9 vhqvhiepd[ exuvwprgh )%6(16( shdnyrowdjh io\edfn '&0ru45
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 17 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.6 burst mode operation (fbctrl pin) the flyback controller enters the burst mode when the output power is very low and the switching frequency is < 25 khz. in burst mode, the flyback converter switching frequency is 36.5 khz. the minimum flyback sense voltag e of 232 mv, in combination with an offset voltage (see section 7.3.3 ), determines the peak current. a burst cycle starts when one of the following is made: ? v fbctrl > 2.4 v ? v cc v th(uvlo) the burst cycle is stopped when v fbctrl <0.77v. in burst mode, the internal ic supply current is reduced to improve the no-load and low-load input power. the burst mode is exited and normal operation resumes when the v fbctrl >2.8v (see figure 13 ). fig 11. time-out protection circuit fig 12. SSL8516BT time-out protection (signals) and safe restart ddd )%&75/ ?$ n 9 9 9 wlp hrxw ddd 9 9 9 )%&75/ rxwsxw y rowdjh wdujhwrxwsx w yrowdjhuhdfk hg zlwklqwlphrxw wlph uhvwduw wdujhwrxwsxw yrowdjhqrwuhdfkhg zlwklqwlphrxwwlph
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 18 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.7 soft-start (fbsense pin) to prevent audible transformer noise during start-up, the soft-start function slowly increases the transformer peak current. to implement the soft-sta rt function, place a capacitor c ss2 in parallel with resistor r ss2 (see figure 14 ). an internal current source charges the capacitor to: (5) with a maximum of 0.55 v. the start level and the time constant of the increasing primary current level can be adjusted externally by changing the values of r ss2 and c ss2 . (6) the soft-start current i start(soft)fb switches on when v cc reaches v startup . when the v fbsense reaches 0.55 v, the flyback converter starts switching. the charging current i start(soft)fb flows when the v fbsense is < 0.55 v. if v fbsense exceeds 0.55 v, the soft-start current source starts limiting the current. after the flyback converter has started, the soft-start current source is switched off. when the ic is operating in the burst mode , the soft-start function is switched off. fig 13. burst mode operation ddd ordg 9 rxw )%&75/ io\edfndfwlyh exuvwprgh )%'5,9(5 9 9 n+] io\edfniuhtx hqf\ 9 vi start soft ?? fb r ss2 ? = ? start soft ?? fb 3r ss2 c ss2 ?? =
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 19 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.8 maximum on-time the flyback controller limits the on-time of the external mosfet to 38.5 ? s. when the on-time is longer than 38.5 ? s, the ic stops switching and enters the safe restart state. 7.3.9 overvoltage protection (fbaux pin) an output ovp is implemented in the greenc hip series. in the SSL8516BT, the auxiliary voltage is sensed using the current flowing into the fbaux pin during the secondary stroke. the auxiliary winding voltage is a well-defined replica of the ou tput voltage. an internal filter averages voltage spikes. an internal up-down counter prevents false ov p detection which can occur during esd or lightning events. the internal counter counts up by one when the output voltage exceeds the ovp trip level within one switching cycle . the internal counter counts down by two when the output voltage has not exceeded the ovp trip level in one switching cycle. when the counter has reached six, the ic assumes a true overvoltage and triggers the safe start protection the demagnetization resistor, r fbaux sets the output voltage v o(ovp) at which the ovp function trips: (7) where n s is the number of secondary windings and n aux is the number of auxiliary windings of the transformer. current i ovp(fbaux) is internally trimmed. accurate ovp detection is made po ssible by adjusting the value of r fbaux to the turns ratio of the transformer. fig 14. flyback soft-start ddd 62)767$57 &21752/ 2&3 )%6(16( 6 5 66 & 66 5 6(16( ?$ rfsohyho , vwduwvriwie ?$ v oovp ?? n s n aux ---------- - i ovp fbaux ?? r fbaux v clamp fbaux ?? + ? ?? =
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 20 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 7.3.10 overcurrent protection (fbsense pin) the primary peak current in the transformer is measured accurately cycle-by-cycle using the external sense resistor r sense2 . the ocp circuit limits v fbsense to a level set by v fbctrl (see also section 7.3.3 ). the ocp detection is suppressed during the leading-edge blanking period, t leb (equals t on(fb)min ? t d(fbdriver) ), to prevent false triggering due to switch-on spikes. 7.3.11 overpower protection during the flyback converter primary stroke, the flyback converter input voltage is measured by sensing the current that is drawn from the fbaux pin. the current information is used to limit the maximum flyback converter peak current and is measured using th e fbsense pin. the internal com pensation is such, that a maximum output power is obtained which is almost independent of the pfc output voltage. the opp curve is given in figure 16 . 7.3.12 driver (fbdriver pin) the driver circuit for the external power mosfet gate includes a current sourcing capability of 500 ma at 2 v on the fbdriver pin. it also includes a current sink capability of 1.2 a at 10 v on the fbdriver pin. thes e capabilities ensure fast switch-on and switch-off of the power mosfet for efficient operation. fig 15. ocp leading-edge blanking w ohe 2&3ohyho 9 )%6(16( w ddd fig 16. overpower protection curve ddd , )%$8; ?$ 9 )%6(16( p9
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 21 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 8. limiting values [1] equivalent to discharging a 100 pf capacitor through a 1.5 k ? series resistor. table 3. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit voltages v cc supply voltage ? 0.4 +38 v v latch voltage on pin latch current limited ? 0.4 +10 v v fbctrl voltage on pin fbctrl ? 0.4 +9 v v pfccomp voltage on pin pfccomp ? 0.4 +5 v v vinsense voltage on pin vinsense current limited ? 0.4 +10 v v vosense voltage on pin vosense current limited ? 0.4 +10 v v pfcaux voltage on pin pfcaux ? 25 +25 v v fbsense voltage on pin fbsense current limited ? 0.4 +5 v v pfcsense voltage on pin pfcsense current limited ? 0.4 +5 v v pfctimer voltage on pin pfctimer current limited ? 0.4 +10 v v hv voltage on pin hv ? 0.4 +650 v currents i fbctrl current on pin fbctrl ? 30 ma i fbaux current on pin fbaux ? 1+1ma i pfcsense current on pin pfcsense ? 1+10ma i fbsense current on pin fbsense ? 1+10ma i fbdriver current on pin fbdriver ? <10% ? 0.8 +2 a i pfcdriver current on pin pfcdriver ? <10% ? 0.8 +2 a i pfctimer current on pin pfctimer ? 1+0.1ma i hv current on pin hv during start-up and restart -8ma ? = 3 % due to dv/dt on hv pin ? 15 +30 ma general p tot total power dissipation t amb <75 ? c-0 . 6w t stg storage temperature ? 55 +150 ?c t j junction temperature ? 40 +155 ?c esd v esd electrostatic discharge voltage human body model pins 1 to 14 [1] ? 2+2kv pin 16 (hv) [1] ? 2+2kv charged device model ? 500 +500 v
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 22 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 9. thermal characteristics 10. characteristics table 4. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient in free air; jedec test board 127 k/w r th(j-c) thermal resistance from junction to case in free air; jedec test board 36 k/w table 5. characteristics t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit start-up current source (hv pin) i hv current on pin hv v hv >75v v cc 75v v cc 75v; v trip SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 23 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller i cc(oper) operating supply current no-load on pins fbdriver and pfcdriver; v fbctrl =5v; f fb =f pfc = 100 khz; ? =30% 2.45 2.7 2.95 ma ic in burst mode; no-load on pins fbdriver and pfcdriver; flyback switching; v fbctrl =1.6v; v pfcsense =0v 1.75 1.95 2.15 ma ic in burst mode; flyback not switching; v fbctrl =0v; v pfcsense =0v 1.24 1.35 1.46 ma i cc(prot) protection supply current time-out protection triggered; v hv =0v 0.3 0.45 0.6 ma i cc(pd) power-down mode supply current ic in power-down mode; v hv = 0 v 0.3 0.45 0.6 ma input voltage sensing pfc (vinsense pin) v stop(vinsense) stop voltage on pin vinsense 0.86 0.89 0.92 v v start(vinsense) start voltage on pin vinsense 1.12 1.16 1.20 v v flr fast latch reset voltage active after v th(uvlo) is detected 0.6 0.75 0.9 v v flr(hys) hysteresis of fast latch reset voltage 60 110 160 mv i i(vinsense) input current on pin vinsense v vinsense >v stop(vinsense) after v start(vinsense) is detected 520 50na v th(sel)clmp clamp select threshold voltage on pin vinsense 1.9 2 2.1 v v th(sel)clmp(hys) clamp select threshold voltage hysteresis 60 100 140 mv v th(pd) power-down threshold voltage 285 385 485 mv v th(pd)exit exit power-down threshold voltage v cc = 0 v 335 460 585 mv v hys(pd) power-down hysteresis voltage 45 75 105 mv loop compensation pfc (pfccomp pin) g m transconductance v vosense to i o(pfccomp) 57 77 97 ? a/v i o(pfccomp) output current on pin pfccomp v vosense = 2 v; v pfccomp = 2.75 v 30 37 44 ? a v vosense = 3.3 v; v pfccomp =2.75v ? 108 ? 88 ? 68 ? a i en(pfccomp) enable current on pin pfccomp - ? 55 - ? a table 5. characteristics ?continued t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 24 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller v clamp(pfccomp) clamp voltage on pin pfccomp low-power mode; pfc off; initial start-up; lower clamp voltage. [1] vinsense ? v th(sel)clmp + v th(sel)clmp(hys) on pin vinsense; v vosense =2v [2] 3.2 3.32 3.44 v vinsense < v th(sel)clmp on pin vinsense; v vosense =2v [2] 1.06 1.18 1.30 v upper clamp voltage 3.6 3.75 3.9 v high-power mode; pfc on; uni-directional source clamp; i pfccomp = ? 30 ? a; v vosense =2.5v 1.09 1.19 1.29 v v ton(pfccomp)zero zero on-time voltage on pin pfccomp 3.4 3.5 3.6 v pulse-width modulator pfc t on(pfc) pfc on-time v vinsense =3.3v; v vosense =2v; v pfccomp =v clamp(pfccomp) (lower clamp) 3.6 4.7 5.8 ? s v vinsense =1v; v vosense =2v; v pfccomp =v clamp(pfccomp) (lower clamp) 33 46 59 ? s output voltage sensing pfc (vosense pin) v th(start)vosense start threshold voltage on pin vosense open-loop 0.45 0.5 0.55 v v th(stop)vosense stop threshold voltage on pin vosense 0.35 0.4 0.45 v v hys(vosense) hysteresis voltage on pin vosense v th(start)vosense ? v th(stop)vosense 75 100 125 mv v reg(vosense) regulation voltage on pin vosense for i o(pfccomp) = 0 a 2.475 2.5 2.525 v v ovp(vosense) t on =0 ? s 2.59 2.62 2.65 v i prot(vosense) protection current on pin vosense ? 50 ? 25 ? 5na overcurrent protection pfc (pfcsense pin) v sense(pfc)max maximum pfc sense voltage ? v/ ? t = 0 v/s 465 495 525 mv t d(pfcdriver) delay time on pin pfcdriver v pfcsense pulse-stepping 400 mv around v sense(pfc)max -50 -ns t leb(pfc) pfc leading edge blanking time v pfcsense = 0.75 v 230 290 350 ns i prot(pfcsense) protection current on pin pfcsense ? 50 - ? 5na table 5. characteristics ?continued t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 25 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller soft-start pfc (pfcsense pin) i start(soft)pfc pfc soft start current ? 73 ? 60 ? 47 ? a v start(soft)pfc pfc soft start voltage enabling voltage 0.45 0.5 0.55 v v stop(soft)pfc pfc soft stop voltage disabling voltage 0.4 0.45 0.5 v oscillator pfc f sw(pfc)max maximum pfc switching frequency 320 400 480 khz t off(pfc)min minimum pfc off-time secondary stroke 0.8 1.1 1.4 ? s valley switching pfc (pfcaux pin) (? v/ ? t) vrec(pfc) pfc valley recognition voltage change with time -- 1.7v/ ? s t to(vrec)pfc pfc valley recognition time-out time 34.2 5.4 ? s demagnetization management pfc (pfcaux pin) v th(comp)pfcaux comparator threshold voltage on pin pfcaux ? 125 ? 90 ? 55 mv t to(demag)pfc pfc demagnetization time-out time 39 48 57 ? s i prot(pfcaux) protection current on pin pfcaux v pfcaux =50mv ? 75 - ? 5na pfc off delay (pfctimer pin) i source(pfctimer) source current on pin pfctimer v pfctimer =2.5v ? 5.4 ? 4.7 ? 4 ? a r sink(pfctimer) sink resistance on pin pfctimer v pfctimer =2.5v 4 5.5 7 k ? v start(pfctimer) start voltage on pin pfctimer 0.93 1.03 1.13 v v stop(pfctimer) stop voltage on pin pfctimer 2.85 3 3.15 v v th(off)pfctimer switch-off threshold voltage on pin pfctimer pfc override voltage 4.2 4.4 4.6 v driver (pfcdriver pin) i src(pfcdriver) source current on pin pfcdriver v pfcdriver =2v - ? 0.5 - a i sink(pfcdriver) sink current on pin pfcdriver v pfcdriver =2.5v - 0.7 - a v o(pfcdriver)max maximum output voltage on pin pfcdriver 10 11 12 v table 5. characteristics ?continued t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 26 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller overvoltage protection flyback (fbaux pin) i ovp(fbaux) overvoltage protection current on pin fbaux 279 300 321 ? a demagnetization management flyback (fbaux pin) v th(comp)fbaux comparator threshold voltage on pin fbaux 60 90 120 mv i prot(fbaux) protection current on pin fbaux v fbaux =50mv ? 65 - ? 5na v clamp(fbaux) clamp voltage on pin fbaux i fbaux = ? 100 ? a ? 0.75 ? 0.7 ? 0.65 v i fbaux =300 ? a 0.87 0.92 0.97 v t sup(xfmr_ring) transformer ringing suppression time 1.7 2.2 2.7 ? s pulse width modulator flyback t on(fb)max maximum flyback on-time 32.5 38.5 44.5 ? s oscillator flyback f sw(fb)max maximum flyback switching frequency 110 130 150 khz v start(red)f frequency reduction start voltage transfer from dcm/qr to fr mode 3.8 4 4.2 v f sw(fb)swon(pfc) pfc switch-on flyback switching frequency 70 73 76 khz f sw(fb)swoff(pfc) pfc switch-off flyback switching frequency 50 53 56 khz f sw(fb)burst(ent) enter burst mode flyback switching frequency enter burst mode 21 25 29 khz f sw(fb)burst burst mode flyback switching frequency normal operation 31 36.5 42 khz v en(pfc)fbctrl pfc enable voltage on pin fbctrl override voltage 3.4 3.75 4.1 v f sw(fb)vco voltage controlled oscillator flyback switching frequency v fbctrl =2.8v 4553 61khz peak current control flyback (fbctrl pin) v fbctrl voltage on pin fbctrl for maximum flyback peak current 4.6 4.9 5.2 v v to(fbctrl) time-out voltage on pin fbctrl enable voltage 5.3 5.5 5.7 v trip voltage 7.3 7.75 8.2 v v th(burst)off off-state burst mode threshold voltage on pin fbctrl 0.62 0.77 0.92 v table 5. characteristics ?continued t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 27 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller v th(burst)on on-state burst mode threshold voltage on pin fbctrl 2.2 2.4 2.6 v v th(burst)exit exit burst mode threshold voltage on pin fbctrl 2.6 2.8 3.0 v v burst(exit-on) burst mode voltage difference between exit and on-state pin fbctrl = v th(burst)exit -v th(burst)on 325 390 455 mv v burst(on-off) burst mode voltage difference between on-state and off-state pin fbctrl = v th(burst)on -v th(burst)off 1.5 1.63 1.76 v i o(fbctrl) output current on pin fbctrl v fbctrl =0v ? 0.75 ? 0.6 ? 0.45 ma v fbctrl =4.5v ? 0.3 ? 0.24 ? 0.18 ma i to(fbctrl) time-out current on pin fbctrl v fbctrl =6v ? 35 ? 29 ? 23 ? a r int(fbctrl) internal resistance on pin fbctrl 9.8 13.2 16.5 k ? valley switching flyback (hv pin) (? v/ ? t) vrec(fb) flyback valley recognition voltage change with time [3] ? 75 - +75 v/ ? s t d(vrec-swon) valley recognition to switch-on delay time [3] -75 -ns soft-start flyback (fbsense pin) i start(soft)fb flyback soft start current ? 75 ? 60 ? 45 ? a v start(soft)fb flyback soft start voltage enable voltage 0.5 0.55 0.6 v overcurrent protection (o cp) flyback (fbsense pin) v sense(fb)max maximum flyback sense voltage ? v/ ? t = 0 v/s 525 545 565 mv v sense(fb)min minimum flyback sense voltage ? v/ ? t = 0 v/s 221 232 243 mv t d(fbdriver) delay time on pin fbdriver v fbsense pulse-stepping 400 mv around v sense(fb)max -80 -ns t on(fb)min minimum flyback on-time v fbcrtl =3v; v fbsense = 0.75 v 280 340 400 ns i adj(fbsense) adjust current on pin fbsense ? 2.29 ? 2.1 ? 1.91 ? a overpower protection (opp) flyback (fbsense pin) v sense(fb)max maximum flyback sense voltage ? v/ ? t=0v/s i fbaux =80 ? a 525 545 565 mv i fbaux =120 ? a 495 540 565 mv i fbaux =240 ? a 400 445 490 mv i fbaux =360 ? a 345 400 455 mv table 5. characteristics ?continued t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 28 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller [1] a typical application with a compensation network on the pfccomp pin, such as the example in figure 3 . [2] the clamp voltage on the pfccomp pin is dependent on the vinsense voltage. when the v vinsense rises above v th(sel)clmp +v th(sel)clmp(hys) , the high clamp level is active. when the voltage on the vinsense pin drops below the v th(sel)clmp level again, the low clamp level is active. [3] guaranteed by design. driver (fbdriver pin) i src(fbdriver) source current on pin fbdriver v fbdriver =2v - ? 0.5 - a i sink(fbdriver) sink current on pin fbdriver v fbdriver =2.5v - 0.7 - a v o(fbdriver)(max) maximum output voltage on pin fbdriver 10 11 12 v latch input (latch pin) v prot(latch) protection voltage on pin latch 469 494 519 mv i o(latch) output current on pin latch v prot(latch) SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 29 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 11. application information an led driver with the SSL8516BT consists of a pfc circuit and a flyback converter (see figure 17 ). capacitor c vcc buffers the ic supply voltage. the ic supply is charged from the high voltage rectified mains during start-up and the aux iliary winding of the flyback converter during operation. sense resistors r sense1 and r sense2 convert the current through the mosfets s1 and s2 into a voltage on the pfcsense and fbsense pins. the r sense1 and r sense2 values define the maximum primary peak current in mosfets s1 and s2. in the example, the latch pin is connected to a negative temperature coefficient (ntc) resistor. the protection is activated when the resistance drops below the value as calculated in equation 8 : (8) capacitor c timeout is connected to the fbctrl pin. r loop ensures that the time-out capacitor does not interfere with the flyback regulation control loop. r s1 and r s2 prevent that the soft-start capacitors c ss1 and c ss2 are charged during normal operation due to negative voltage spikes across the sense resistors. resistor r aux1 protects the ic from damage during lightning events. r s3 and r comp can be used to lower the pfc on/off power level. the minimum and maximum peak current ratio increase. so, the pfc switch-on and switch-off power level decreases. r drv1 and r drv2 prevent that the internal moset drivers are damaged due to, for example, power mosfet avalanche. depending on the drain voltage maximum rating of mosfet s2, the hv pin of the ic can either be connected to the center tap of the flyback transformer or to the drain of mosfet s2. v prot latch ?? i olatch ?? ------------------------------- 16.2 k ? =
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 30 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller (1) in the application, the hv pin of the ic can either be connect ed to the center tap of the flyback transformer or to the drai n of mosfet s2. fig 17. SSL8516BT typical application diagram ddd 7u & ' 5 5 5 /223 5 5 & & 7,0(287 & 3)&7,0(5 5 17& & ' & & 9&& & & 5 & 7+' 5 $8; 5 9pdlqv 3)&&203 3)&$8; ,& 9,16(16( )%&75/ )%$8; )%6(16( 9&& /$7&+ *1' 3)&7,0(5 3)&'5,9(5 3)&6(16( 926(16( +9 )%'5,9(5 5 6(16( 5 &203 7 u 5 4 5 5 5 5 5 8 & ,& ' & 287 /2$' 6 6 ' 5 66 5 '59 5 6 & 66 5 5 '59 5 )%$8; 5 6(16( 5 6 5 66 & 66 5 6 5 & exon 5
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 31 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 12. package outline fig 18. package outline sot109-1 (so16) ; z 0 $ $ $ e s ' + ( / s 4 ghwdlo; ( = h f / y 0 $ $ $ \ slqlqgh[ 81,7 $ pd[ $ $ $ e s f ' ( h + ( / / s 4 = \ z y 5()(5(1&(6 287/,1( 9(56,21 (8523($1 352-(&7,21 ,668('$7( ,(& -('(& -(,7$ pp lqfkhv r r ',0(16,216lqfkglphqvlrqvduhghulyhgiurpwkhruljlqdoppgl phqvlrqv 1rwh 3odvwlfruphwdosurwuxvlrqvripplqfkpd[lpxp shuvlghduhqrwlqfoxghg 627 ( 06 pp vfdoh 62sodvwlfvpdoorxwolqhsdfndjhohdgverg\zlgwkp p 627
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 32 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 13. revision history table 6. revision history document id release date data sheet status change notice supersedes SSL8516BT v.1 20150526 product data sheet - -
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 33 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller 14. legal information 14.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 14.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 14.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept no liability for inclusion and/or use of nxp semiconducto rs products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification.
SSL8516BT all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights r eserved. product data sheet rev. 1 ? 26 may 2015 34 of 35 nxp semiconductors SSL8516BT greenchip pfc and flyback controller export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from competent authorities. non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. translations ? a non-english (translated) version of a document is for reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 14.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. greenchip ? is a trademark of nxp semiconductors n.v. 15. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors SSL8516BT greenchip pfc and flyback controller ? nxp semiconductors n.v. 2015. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 26 may 2015 document identifier: SSL8516BT please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 16. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 2 2.1 distinctive features . . . . . . . . . . . . . . . . . . . . . . 2 2.2 green features . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.3 pfc green features . . . . . . . . . . . . . . . . . . . . . 2 2.4 flyback green features . . . . . . . . . . . . . . . . . . . 2 2.5 protection features . . . . . . . . . . . . . . . . . . . . . . 2 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 ordering information . . . . . . . . . . . . . . . . . . . . . 3 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 7 functional description . . . . . . . . . . . . . . . . . . . 5 7.1 general control . . . . . . . . . . . . . . . . . . . . . . . . . 5 7.1.1 start-up and undervoltage lockout (uvlo) . . 5 7.1.2 power-down mode . . . . . . . . . . . . . . . . . . . . . . 7 7.1.3 supply management. . . . . . . . . . . . . . . . . . . . . 8 7.1.4 latch input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.1.5 fast latch reset . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.1.6 overtemperat ure protection . . . . . . . . . . . . . . . 8 7.2 power factor correction circuit . . . . . . . . . . . . . 8 7.2.1 t on control (pfccomp pin). . . . . . . . . . . . . . . . 8 7.2.2 valley switchin g and demagnetization (pfcaux pin) . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.2.3 frequency limitation . . . . . . . . . . . . . . . . . . . . . 9 7.2.4 mains voltage compensation (vinsense pin) . . . . . . . . . . . . . . . . . . . . . . . . 9 7.2.5 soft-start (pfcsense pin). . . . . . . . . . . . . . . 10 7.2.6 pfc switch-on/switch-off control . . . . . . . . . . 10 7.2.7 pfc switch off delay (pfctimer pin) . . . . . . 11 7.2.8 overcurrent protection (pfcsense pin) . . . . 11 7.2.9 mains undervoltage lockout/brownout protection (vinsense pin) . . . . . . . . . . . . . . 12 7.2.10 overvoltage protection (vosense pin) . . . . . 12 7.2.11 pfc open-loop protection (vosense pin) . . 12 7.2.12 driver (pfcdriver pin) . . . . . . . . . . . . . . . . 12 7.3 flyback controller . . . . . . . . . . . . . . . . . . . . . . 12 7.3.1 multimode operation . . . . . . . . . . . . . . . . . . . . 12 7.3.2 valley switching (hv pin) . . . . . . . . . . . . . . . . 14 7.3.3 current mode control (fbsense pin) . . . . . . 15 7.3.4 demagnetization (fbaux pin) . . . . . . . . . . . . 16 7.3.5 flyback control/time-out (fbctrl pin) . . . . . 16 7.3.6 burst mode operation (fbctrl pin) . . . . . . . 17 7.3.7 soft-start (fbsense pin) . . . . . . . . . . . . . . . . 18 7.3.8 maximum on-time . . . . . . . . . . . . . . . . . . . . . . 19 7.3.9 overvoltage protection (fbaux pin) . . . . . . . 19 7.3.10 overcurrent protection (fbsense pin) . . . . . 20 7.3.11 overpower protection. . . . . . . . . . . . . . . . . . . 20 7.3.12 driver (fbdriver pin) . . . . . . . . . . . . . . . . . 20 8 limiting values . . . . . . . . . . . . . . . . . . . . . . . . 21 9 thermal characteristics . . . . . . . . . . . . . . . . . 22 10 characteristics . . . . . . . . . . . . . . . . . . . . . . . . 22 11 application information . . . . . . . . . . . . . . . . . 29 12 package outline. . . . . . . . . . . . . . . . . . . . . . . . 31 13 revision history . . . . . . . . . . . . . . . . . . . . . . . 32 14 legal information . . . . . . . . . . . . . . . . . . . . . . 33 14.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 33 14.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 14.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 33 14.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 34 15 contact information . . . . . . . . . . . . . . . . . . . . 34 16 contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

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