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irs2983 spbf 1 www.irf.com ? 20 1 3 international rectifier dec ember 10 , 201 3 led flyback control ic features ? flyback led driver ? critical - conduction / transition mode operation ? primary constant power control ? burst mode operation at light load ? over - current protection ? micropower startup (150 ? a) ? low quiescent current (2.5 ma) ? lat ch immunity and esd protection ? open load over voltage protection ? noise immunity typical applications ? led drivers product summary topology flyback v offset n/a v out n/a i o+ & i o - (typical) 200 ma / 4 00 ma t on & t off (typical) 60 ns / 30 ns dead time (typical) n/a package 8 - lead soic irs2 983 spb f ordering information base part number package type standard pack complete part number form quantity irs2983 spbf s o8n tube/bulk 95 IRS2983SPBF tape and reel 2500 irs2983s trpbf
irs2983 spbf 2 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 table of contents page description 3 qualification inform ation 4 absolute maximum ratings 5 recommended operating conditions 5 electrical characteristics 6 functional block diagram 8 state diagram 9 input/output pin equivalent circuit diagram 10 lead definitions 11 lead assignments 11 application inform ation and additional details 12 package details 15 tape and reel details 16 part marking information 17
irs2983 spbf 3 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 description the irs2983 is a fully integrated, fully protected smps control ic designed to drive flyback converter led drivers. the irs2983 features include primary side power regulation, which allows a basic converter to be implemented without the need for an opto isolator in a flyback led driver with a fixed load enabling a low cost, high reliability isolated led driver design to be realized. the irs2983 may also be used in converters that do include secondary feedback through an opto isolator. other features of the irs2983 include a high voltage startup enabling vcc supply to be derived initially from the high voltage dc bus until the auxiliary inductor winding is able to take over. the irs2983 operates in critical conduction (crcm) or discontinuous (dcm) modes and is fully protected against open and short circuit as well as inductor saturation. the irs2983 may be used in single stage flyback led drivers with an unsmoothed dc bus to obtain high power factor and low thd. typical connection diagram dfb t1 br1 cin m1 rg cvout rcs cf rf dvcc ic1 rin rdc rzx1 ac line input cdc ccomp cs com out vcc comp vdc hv zx irs2983 7 6 5 1 2 3 4 8 rzx2 cvcc rout radj dsn rsn csn ci dz rz qvcc cs
irs2983 spbf 4 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 qualification information ? qualification level industrial ?? comments: this family of ics has passed jedecs industrial qualification. irs consumer qualification level is granted by extension of the higher industrial level. moisture sensitivity level soic8 msl2 ??? 260c (per ipc/jedec j - std - 020) esd machine model class b (per jedec standard jesd22 - a115) h uman body model class 1c (per eia/jedec standard eia/jesd22 - a114) ic latch - up test class i , level a (per jesd78) rohs compliant yes ? qualification standards can be found at international rectifiers web site http:// www.irf.com/ ?? higher qualification ratings may be available should the user have such requirements. please contact your international rectifier sales representative for further information. ??? higher msl ratings may be available for the specific pac kage types listed here. please contact your international rectifier sales representative for further information.
irs2983 spbf 5 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 absolute maximum ratings absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. all voltage parameters are absolute voltages referenced to com, all currents are defined positive into any lead. the thermal resistance and power dissipation ratings are measured under board mounted and still air conditions. symbol definition mi n. max. units v cc ic low voltage supply ? out gate driver output voltage - 0.3 v cc + 0.3 io max maxim um allowable output current (out ) due to external power transistor m iller effect - 800 600 ma i cc vcc current 0 25 ma v hv hv pin voltage - 0.3 600 v v comp comp pin voltage - 0.3 v cc + 0.3 v dc vdc pin voltage v zx zx pin voltage i comp comp pin current - 5 5 ma i zx zx pin current i cs cs pin current p d package power dissipation @ ta ? ? ? ja thermal resistance, ju nction to ambient (8 - pin s oic) --- 200 oc/w t j junction temperature - 55 150 oc t s storage temperature - 55 150 t l lead temperature (soldering, 10 seconds) --- 300 ? this ic contains a zener clamp structure between the chip vcc and com which has a nominal breakdown voltage of 20v. this supply pin should not be driven by a dc, low impedance power source greater than the vclamp specified in the electrical characteristics section. recommended operating conditions for proper operation the device should be used within recommended conditions. symbol definition min. max. units v cc supply voltage v ccuv+ 18 v i cc v cc supply current note 2 10 ma i cs cs pin current - 1 1 i zx zx pin current v dc vdc pin voltage 0 6 .0 v v cs vcs pin voltage 0 .1 1.3 t j junction temperature - 25 125 oc
irs2983 spbf 6 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 electrical characteristics v cc =14v +/- 0.25v, cout = 1000pf, v comp = v oc = vbus = vzx = 0v, t a =25 ? c unless otherwise specified symbol definition min typ max units test conditions supply characteristics v ccuv + v cc supply undervoltage positive going threshold 11.5 12.5 13.5 v v ccuv - v cc supply undervoltage negative going threshold 9.5 10.5 11.5 v uvhys v cc supply undervoltage lockout hysteresis 1.5 2.0 3.0 i qccuv uvlo mode v cc quiescent current --- 150 --- ? cc v cc supply current --- 2.5 5.0 ma v clamp v cc zener clamp voltage 19.8 20.8 21.8 v i cc = 10ma high voltage startup charac teristics v hvsmin minimum startup voltage 3 0.0 --- --- i hv_charge vcc charge current 1 2 --- ma vcc< v ccuv - hv=100v~400v i hvs_off high voltage start - up circuit off state leakage current --- --- 50 ? error amplifier characteristics i comp source comp pin error amplifier output current sourcing --- 30 --- ? comp sink comp pin error amplifier output current sinking --- 30 --- v compoh error amplifier output voltage swing (high state) --- 13.5 --- v v compol error amplifier output volta ge swing (low state) --- 2.5 --- gbd v compflt error amplifier output voltage in fault mode --- 0 --- i vbus input bias current --- - 1 - -- ? control characteristics v zx+ zx pin threshold voltage (arm) 1.40 1.54 1.68 v v zx - zx pin thres hold voltage (trigger) 0.52 0. 60 0.68 v pref power regulation reference --- 1.00 --- k mult multiplier gain 1.90 2.00 2.10 vcs=0.5v t blank oc pin current - sensing blank time 160 200 264 ns vbus=2.5v comp=4.0v cs=1.5v t wd gate drive restart pulse int erval 6 0 100 135 ? onmin pwm minimum on time 136 167 198 n s t onmax pwm maximum on time 22 32 42 ?
irs2983 spbf 7 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 (ohfwulfdo&kdudfwhulvwlfvfrqw?g v cc =14v +/ - 0.25v, cout = 1000pf, v comp = v oc = vbus = vzx = 0v, t a =25 c unless otherwise specified. t offmin pwm minimum off time 2.7 3.0 3.3 p s v compoff_hys cut off voltage hysteresis --- 40 --- mv v dcmax maximum voltage for multiplier input ? --- --- 7.0 v gbd v cspkmax maximum peak voltage for multiplier input ? --- -- - 1.0 v signal is averaged before entering multiplier input. gbd protection circuitry characteristics v csth cs pin over - current sense threshold 1.19 1.25 1.31 v v compoff cut off voltage below which gate drive output is disabled 1.12 1.40 1.68 vbus=2.6 v v ovth zx pin over - voltage comparator threshold 4.90 5. 15 5. 40 v ovhys zx pin over - voltage comparator hysteresis --- 200 --- mv gate driver output characteristics (out pin) v ol low - level output voltage --- 0 100 mv i o = 0 v oh high - level output volt age --- 0 100 v cc v o i o = 0 t r turn - on rise time --- 60 110 ns t f turn - off fall time --- 30 70 i0+ source current --- 2 00 --- ma i0 - sink current --- 4 00 --- ? multiplier operates accurately from zero to the maximum input specif ied. gbd guaranteed by design
irs2983 spbf 8 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 functional block diagram o u t c o m p z x v z x + / v z x - v c c c s 5 7 3 4 v o v t h v c l a m p v d c 2 h v s t a r t u p h v 1 v p r e f v c c 8 c o m 6 u v l o q s r q r e s t a r t t i m e r v c s t h q s r q s e t d o m i n a n t b l a n k t i m e r a v e r a g e r x k m u l t m i n i m u m o f f t i m e
irs2983 spbf 9 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 state diagram u v l o m o d e i c c = i q c c u v h v r e g = o n o u t = l o w c o m p = h e l d l o w p o w e r t u r n e d o n s t a r t u p m o d e o u t = s w i t c h i n g v c c > v c c u v + f a u l t m o d e o u t = l o w c o m p = h e l d l o w v z x > v o v t h c u r r e n t l i m i t o u t = l o w v c s > v c s t h w a t c h d o g t i m e o u t r e g u l a t i n g m o d e o u t = s w i t c h i n g h v r e g = o f f v m u l t > 1 v v c s < v c s t h - v o v h y s v c s > v c s t h v c s < v c s t h - v o v h y s v z x > v o v t h
irs2983 spbf 10 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 input/output pin equivalent circuit diagrams v c c c o m c o m p , v d c , c s , z x , o u t e s d d i o d e e s d d i o d e v c l a m p
irs2983 spbf 11 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 lead definitions symbol description hv high voltage startup input vdc full wave voltage input comp compensation and averaging capacitor input zx pfc zero - crossing & over - voltage detection cs pfc current sensing input com ic po wer & signal ground out gate driver output vcc logic & low - side gate driver supply lead assignments c s c o m o u t v c c c o m p v d c h v z x i r s 2 9 8 3 7 6 5 1 2 3 4 8
irs2983 spbf 12 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 application information and additional details the irs2983 is a switched mode contro ller ic designed for use in flyback or buck - boost led driver s . an internal high voltage regulator suppl ies the ic low voltage vcc supply during startup allowing operation directly from a dc input voltage up to 600v. internal high voltage regulator in ord er to begin operating the irs2983 requires the low voltage vcc supply to be raised above the under voltage lockout positive threshold (vccuv+) and to continue ope r ating vcc must be maintained above the under voltage lockout negative threshold (vccuv - ). th e hv regulator enables the irs2983 based led driver to start up very rapidly and deliver light within 0.5s of switch on over the range of line voltage input . when th e switching converter is running vcc is normally supplied through an auxiliary winding . whe n operating with primary regulation (see below) as steady state operation is reached the hv regulator is deactivated. the auxiliary winding from the flyback or buck - boost inductor /transformer provides output voltage and zero - crossing (zx) i nformation as we ll as supplying vcc . in the event of a short circuit at the output the vcc supply from the auxiliary winding collapses below vccuv - causing the irs2983 to shut off. t he startup sequence begins again in a continuous 3 hiccup mode until the short circuit is removed thereby preventing damage to the circuit. primary power regulation the irs2983 can operate using primary regulation or using a secondary feedback loop. it is capable of regulating the led output current indirectly by calculating and controlling the input power of the converter. since the led load voltage is essentially constant , the power consumed is approximately proportional to the dc output current. in practice there are variations in led forward voltage drop due to tolerance and temperature, however perfect accuracy is not usually necessary in such applica tions . for a fixed led load the current will be approximately proportional to the input power . the irs2983 senses input voltage and inductor current and us es these quantities to estimate the input power . this 3srzhu is then regulated against an accurate internal reference (vpref) to provid e regulation of the led current typically within +/ - 5% over line voltage variation from 120vac to 230vac. input voltage is sensed through an appropriately s caled resistor divider (rin and rdc) to provide a voltage at vdc within the range from 0v to vdcmax. input current is sensed through a shunt resistor (rcs) connected from the source of the flyback mosfet switch to the dc b us return . this current waveform i s a high frequency ramp rising from zero at the beginning of each switching cycle to reach a peak level at the point the mosfet is switched off and remaining at zero during the off time. figure 1: current sense waveform in order to obtain a dc current feedback signal the irs2983 contains an averaging circuit that takes the cs pin input and converts it to a dc level proportional to the converters input current. this signal is then mu ltiplied with the voltage (vdc) input to pr oduce a n internal voltage proportional to the converter input power. loop compensation is performed by means of a transconductance error amplifier us ing an external capacitor (ccomp) connected to 0v to realize an integrator that provide s a stable error vol tage used to control the converter on time. ccomp is typically 1 ) the output curr ent normally increases by a small amount as the input voltage is increased. radj is a resistor in the order of m eg - o hms that can be added to provide a small feed forward correction to the current sense input allowing the output current t o be fine - tuned to give tighter regulation over a wide input voltage range. at light loads if vcomp drops below vcompol the irs2983 operates in burst mode . t t s v ( t ) v o u t ( t ) v c s ( t )
irs2983 spbf 13 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 primary current limiting at very low input voltages the power regulation loop would require a ve ry high peak current that may exceed t he maximum rating of the inductor. in order to prevent this from occurring , the irs2983 also includes cycle by cycle prima ry current limiting with a threshold vcsth at the cs pin input. under low line or fault conditio ns where the mosfet current is abnormally high the gate drive is switched off after the blanking time tblank. leading edge blanking is necessary to avoid false tripping due to the fast high current switch on transient that occurs at switch on of the mosfet resulting from the ci rcuit parasitics. this is also blanked from the averaging input that feeds the power regulation multiplie r in order to prevent inaccuracies. the irs2983 normally operates in critical conduction mode (crcm), also known as transition o r boundary mode. the transformer auxiliary winding provide s a signal to the irs2983 that indicates when all of the energy stored in the inductor has been transferred to the output. this triggers the start of the next switching cycle. the auxiliary winding voltage is divided down through rzx1 and rzx2 to provide the zx pin input signal . figure 2: cycle by cycle current limiting the pulse that appears at zx has an amplitude proportional to the secondary output voltage and there fore the dc output voltage: [1] where, n a = number of turns on the auxiliary winding n s = number of turns on the secondary winding vout = dc output voltage (led voltage) when the converter mosfet switches off the voltage vzx transitions high . the values of rzx1 and rzx2 must be selected so that this voltage always exceeds the vzx+ threshold. i f the irs2983 is used in a converter that is required to drive loads over a range of voltage an add itional feedback cir cuit is needed to control the output current. in this case the vzx voltage needs to exceed vzx+ at the minimum load voltage. if vzx does not exceed vzx+ the irs2983 cannot operate in crcm and remains pulsing and waiting for twd timeout for the next cycle. when vzx exceeds vzx+ the irs2983 waits until the vzx then drops below vzx - again to initiate the next switching cycle. a capacitor may be added in parallel with rzx2 to add some delay if needed to minimize switching loss by switching on in the minimum poi nt or 3ydooh\riwkhgudlqyrowdjh the irs2983 includes a minimum off time function so that if the zx pin input transitions high and low before toffmin the gate drive output will not go high again until after this period. this prevents false tripping by ringing at the zx input and also limits the converter ma ximum switching frequency by entering discontinuous mode (dcm) under conditions where the off tim e would otherwise be very short. this function extends the operating range of the converter allowing op eration down to very low duty cycles. this thereby enables dimming designs to be implemented as well as limiting operating frequency to prevent overheating of the circuit inductor, mosfet and snubber components. figure 3: zer o crossing detection t t s v ( t ) v o u t ( t ) v c s ( t ) v c s t h ) 2 1 ( 2 rzx rzx n vout rzx n vzx s a ? ? ? t t s v ( t ) v o u t ( t ) v z x ( t )
irs2983 spbf 14 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 over voltage protection the zx is a multi - function input also used for output over voltage limiting. in a flyback or buck - boost converter if the load becomes disconn e cted the output voltage can become very high causing damage to comp onents as well as present ing an electrical hazard. in order to protect against this the irs2983 senses the output voltage indirectly through the zx input , which is proportional t o the actual output voltage. if the zx input voltage exceeds vovth when the mo sfet switches off the gate drive remain s switched off for a twd period before starting the next cycle regardless of when the zx voltage transitions low. t he irs2983 also discharges the comp capacitor to zero so that the next cycle will begin at minimum du ty cycle and ramp up slowly . this protection scheme allows the led load to be hot connected and disconnected from the converter output without risk of damaging the circuit or of high voltages appearing at the output. care should be taken however to avoid l ed damage due to output capacitor discharge. an ntc thermistor at the output may be needed to limit the current surge. the overvoltage threshold is set by choosing the values of rzx1 and r zx2 appropriately, according to the formula: [2] the recommended over voltage threshold is 25% above the normal operating voltage of the led load. operating with a secondary feedback circuit in applications where accurate current regulation over a wide input voltage range or range of output voltages is required, the irs2983 can be used in conjunction with a secondary sensing and feedback circuit. figure 4: overvoltage protection the feedback circuit is usually fed through an opto isolator. this can be connecte d to the irs2983 in the following way: figure 5: secondary feedback circuit a simple output voltage feedback scheme is shown in figure 5 to illustrate how the opto isolator is connected to the irs2983 to create a feedback circuit. the vdc input is tied to com leaving the internal multiplier output at zero so that the comp output provides pull up . the opto isolator feedback pulls down on the comp voltage to reduce the on time as the opto diode current is increased driven by a secondary error amplifier circuit. the hv startup is not disabled in this operating mode but draws only micro current if vcc is biased above 17v. this is easily done by using a series pass transistor with the base biased with an 18v zener diode to supply vcc. 2 ) 2 1 ( rzx n rzx rzx n vovth vout a s ov ? ? ? t t w d v ( t ) v o u t ( t ) v z x ( t ) v c o m p ( t ) t 1 c i n m p f c r p f c r c s c f 2 r f d v c c i c 1 r z x 1 c s c o m o u t v c c c o m p v d c h v z x i r s 2 9 8 3 7 6 5 1 2 3 4 8 r z x 2 c v c c s e c o n d a r y e r r o r f e e d b a c k d z x q v c c r v c c
irs2983 spbf 15 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 package details
irs2983 spbf 16 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 tape and reel details e f a c d g a b h note : controlling dim ension in m m loaded tape feed direction a h f e g d b c carrier tape dimension for 8soicn code min max min max a 7.90 8.10 0.311 0.318 b 3.90 4.10 0.153 0.161 c 11.70 12.30 0.46 0.484 d 5.45 5.55 0.214 0.218 e 6.30 6.50 0.248 0.255 f 5.10 5.30 0.200 0.208 g 1.50 n/a 0.059 n/a h 1.50 1.60 0.059 0.062 metric imperial reel dimensions for 8soicn code min max min max a 329.60 330.25 12.976 13.001 b 20.95 21.45 0.824 0.844 c 12.80 13.20 0.503 0.519 d 1.95 2.45 0.767 0.096 e 98.00 102.00 3.858 4.015 f n/a 18.40 n/a 0.724 g 14.50 17.10 0.570 0.673 h 12.40 14.40 0.488 0.566 metric imperial
irs2983 spbf 17 www.irf.com ? 20 1 3 internati onal rectifier dec ember 10 , 201 3 part marking information the information provided in this document is believed to be accurate and reliable. however, internationa l rectifier assumes no responsibility for the consequences of the use of this information. international rectifier assumes no responsibility for an y infringement of patents or of other rights of third parties which may result from the use of this informat ion. no license is granted by implication or otherwise under any patent or patent rights of international rectifier. the specifications mentioned in this document are su bject to change without notice. this document supersedes and replaces all informatio n previously supplied. for technical support, please contact irs technical assistance center http://www.irf.com/technical - info/ world headquarters: 233 kansas st., el segundo, california 90245 tel : (310) 252 - 7105 s2983 ir logo yww ? part number date code pin 1 identifier lot code (prod mode C 4 digit spn code) assembly site code per scop 200-002 ? xxxx marking code lead free released non-lead free released ? p

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