View MP4034_7724998.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MP4034 offline led driver MP4034 rev. 1.02 www.monolithicpower.com 1 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP4034 is an offline regulator that provides accurate constant-current regulation. the led driver circuit design is simplified by removing the opto-coupler and the secondary feedback components. the MP4034 has an integrated 700v mosfet. its variable off-time control allows a flyback converter to operate in discontinuous conduction mode (dcm). the MP4034 also features complete protection functions such as vcc under-voltage lockout, over-voltage protection, over-temperature protection, and open-loop protection. the MP4034's variable switching frequency provides natural spectrum shaping to smooth the emi signature, which can reduce the emi filter?s size and cost. features ? primary-side?control without opto-coupler or secondary feedback circuit ? precise constant current regulation ? integrated 700v mosfet with minimal external components ? variable off-time and peak-current control ? 550a high-voltage current source ? up to 7w output power ? over-voltage protection ? over-temperature protection ? open-loop protection ? natural spectrum shaping for improved emi signature ? low cost and simple external circuit ? soic8-7a package applications ? offline led driver all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology?, are registered trademarks of monolithic power systems, inc. typical application l n
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 2 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* package top marking MP4034gs soic8-7a MP4034 * for tape & reel, add suffix ?z (e.g. MP4034gs?z); package reference top view 8 6 5 4 3 2 1 soic8-7a absolute maxi mum ratings (1) drain to gnd ................................-0.7v to 700v vcc to gnd ...................................-0.3v to 30v fb input ..........................................-0.7v to 10v continuous power dissipation (t a = +25c) (2) soic8-7a?????????????...1.3w junction temperature ...............................150c lead temperature ....................................260c storage temperature............... -60c to +150c esd capability human body mode .......... 2.0kv esd capability machine mode .................. 200v recommended operating conditions (3) operating vcc range ......................6.6v to 28v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc soic8-7a .............................. 76 ...... 45... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 3 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics v cc = 15v, t a = 25c, unless otherwise noted. parameter symbol condition min typ max units supply voltage management (vcc pin) v cc on threshold v cch 16.8 17.3 17.8 v v cc off threshold v ccl 6 6.3 6.6 v v cc operating voltage 6.6 28 v quiescent current i q at no load condition, v cc =20v 360 410 a operating current i op 60khz, v cc =20v 500 a leakage current from vcc pin i leak_vcc v cc =0v ? 16v, drain float 0.1 1 a internal mosfet (drain pin) break down voltage v brdss v cc =20v, v fb =7v 700 v supply current from drain pin i charge v cc =4v, v drain =100v 450 550 750 a leakage current from drain pin i leak_drain v ds =500v dc 1 10 a on-state resistance r on i d =10ma, t j =20 degree 10 13 ? internal current sense current limit i limit v fb =-0.5v 365 380 395 ma leading-edge blanking t leb 230 300 370 ns feedback input (fb pin) fb pin input current i fb v fb =4v 0.2 0.5 a dcm detect threshold v dcm 80 120 160 mv fb open-circuit threshold v fbopen -0.22 -0.15 -0.08 v first-level fb ovp threshold v fbovp1 3.93 4 4.07 v second-level fb ovp threshold v fbovp2 6.2 6.35 6.5 v ovp sampling delay t ovp 3.5 s thermal shutdown thermal shutdown threshold 150 c thermal shutdown recovery threshold 120 c
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 4 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical characteristics vccl(v) vcch(v) leakage current vs. junction temperature breakdown voltage vs. junction temperature v cc off threshold vs. junction temperature first-level ovp threshold vs. junction temperature v cc on threshold vs. junction temperature fb open circuit threshold vs. junction temperature second-level ovp threshold vs. junction temperature dcm detect threshold vs. temperature chart vfb_open(v) vdcm(v) charge current vs. junction temperature 400 450 500 550 600 650 700 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 500 550 600 650 700 750 800 850 vbrdss(v) 15.0 15.5 16.0 16.5 17.0 17.5 18.0 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 3.900 3.925 3.950 3.975 4.000 4.025 4.050 4.075 4.100 vfb(v) 0.100 0.105 0.110 0.115 0.120 0.125 0.130 -0.200 -0.180 -0.160 -0.140 -0.120 -0.100 -0.080 -0.060 -0.040 -0.020 0.000 5.000 5.250 5.500 5.750 6.000 6.250 6.500 6.750 7.000 vfb_ovp(v)
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 5 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical characteristics (continued) ovp sample delay v s. junction temperature 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -50 -25 0 25 50 75 100 125 on state resistance vs. junction temperature 0 5 10 15 20 -50 -25 0 25 50 75 100 125 current i limit vs. junction temperature 350 360 370 380 390 400 -50 -25 0 25 50 75 100 125 current ilimit(ma)
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 6 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics performance waveforms are tested on the evaluation board of the design example section. v in = 230vac, v out = 40v, i out =0.13a, l = 1.2mh, t a = 25c, unless otherwise noted. i out 50ma/div. i out 50ma/div. i out 100ma/div. i out 100ma/div. v ds 100v/div. v ds 100v/div. v cc 10v/div. v ds 100v/div. v cc 10v/div. v ds 100v/div. i out 50ma/div. v cc 10v/div. v ds 100v/div. i out 50ma/div. v cc 10v/div. v ds 100v/div. i out 50ma/div. i out 50ma/div. v cc 10v/div. v ds 100v/div. i out 50ma/div. v cc 10v/div. v ds 100v/div. input power startup input power shut down ockp entry ockp recovery ovp entry ovp recovery scp entry scp recovery output current ripple
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 7 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics (continued) performance waveforms are tested on the evaluation board of the design example section. v in = 230vac, v out = 40v, i out =0.13a, l = 1.2mh, t a = 25c, unless otherwise noted. input voltage (v) output current regulation -5 -4 -3 -2 -1 0 1 2 3 4 5 80 100120140160180200220240260 i out 100ma/div. v ds 100v/div. v cc 10v/div. v fb 10v/div. normal operation
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 8 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions soic8-7a pin # name description 1 vcc supply. an internal high-voltage curre nt source charges vcc voltage to v cch to start the ic. the internal high-voltage current source will also turn on when v cc falls below v ccl to charge vcc. connect a 0.1f ceramic decoupling capacitor as close as possible to this pin. 3 fb feedback. controls the ovp function. if v fb =4.0v, the first-level ovp triggers and output voltage remains constant. if v fb =6.35v, the second-level ovp triggers, switch immediately shuts off, and ic restarts. 2, 4, 5, 6 gnd ground. 8 drain internal mosfet drain. input fo r the startup high-voltage current source.
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 9 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. functional block diagram figure 1: functional block diagram
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 10 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation figure 2: simplified flyback converter startup initially, the ic is self-supplying through the internal high-voltage current source, which is drawn from the drain pin. the internal high- voltage current source will turn off for better efficiency when v cc reaches the v cc on threshold. then the transformer?s auxiliary winding takes over as the power source. when v cc falls below the v cc off threshold, the ic stops switching and the internal high-voltage current source turns on again. see figure 3 for the start-up waveform. figure 3: vcc uvlo transformer design figure 4: isolated flyback led driver the MP4034 ensures that the circuit operates in discontinues conduction mode (dcm). when the ic internal mosfet turns on, the current (i p ) flowing through transformer?s primary-side winding (n p ) increases linearly until it reaches its peak current limit (i pk ) 0 figure 5: current waveform assume switching frequency is f s , the power stored in the inductor is given by: 2 mpk s 1 plif 2 = then inductance of coupling inductor is then: o m 2 pk s 2p l if = where p o is output power and is the estimated efficiency. when MP4034?s internal switch turns off, the freewheeling current (i s ) will flow through secondary-side diode and decrease linearly, as shown in figure 5. 17.3 v 6. 3 v vcc drain switching pulses regulation occurs here auxiliary winding takes charge high voltage current source on off
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 11 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the relationship of peak current at on period and off period is: p pk _ s pk s n ii n = where p n is the number of primary winding turns, and s n is the number of secondary winding turns. the MP4034 detects the secondary side diode duty cycle by sampling the auxiliary winding voltage and generates a zcd signal as shown in figure 6. figure 6: vfb and zcd waveforms when the fb voltage is high?which means that the current is flowing through secondary- side diode?the zcd signal goes high. conversely, when the fb voltage is low?which means no current flows through the secondary- side diode?the zcd signal goes low, meaning the secondary-side diode duty cycle (d s ) is: s_on s s_on s_off t d tt = + then the average output current is: out pk _ s s s_on p pk ss_ons_off 1 iid 2 t n 1 i 2n t t = = + the MP4034 keeps s d at 0.4. thus the output current is: pp out pk s pk ss nn 11 iidi 2n 5n = = this provides enough information to design the transformer turn ratio. leading-edge blanking turning the power switch on induces a spike on the sense resistor. to avoid falsely terminating the switching pulse, the MP4034 includes a 300ns leading-edge blanking period. during this blanking period, the current sense comparator is disabled and the gate driver can not switch off. dcm detection the MP4034 is designed to operate in discontinuous conduction mode (dcm). to avoid operating in continuous conduction mode (ccm), the MP4034 detects the falling edge of the fb input voltage with each cycle. if the chip does not detect a 120mv falling edge, it will stop switching. over voltage protection the MP4034 has two levels of over-voltage protection based on the fb voltage. in normal operation, MP4034 samples the fb pin voltage 3.5 s after the primary switch turns off, as shown in figure 6. figure 7: auxiliary voltage waveform the relationship of output voltage and v fb is : p_au down fb o d supdown n r v(vv) nrr = + + where v d is the secondary-diode forward-drop voltage. when the MP4034 detects that the fb voltage equals 4.0v, the first level ovp triggers. the switching frequency drops to maintain the output voltage at a constant value. if v fb voltage exceeds 6.35v for 3.5 s, it will shut down immediately and discharge the vcc
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 12 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. voltage. when v cc drops to uvlo, the MP4034 will restart. 1 2 n-1 n figure 8: led string assume the forward voltage of one led is v f and the total number of leds on the string is n. so the output voltage can be calculated as nv f . to ensure that ovp won?t trigger during normal operation; the v fb should not exceed v fbovp1 (typical 4.0v). however, avoid a large output voltage when ovp occurs. so the voltage reflected on the fb pin should be: p_au down fb f d fbovp1 sdownup n r v (n v v ) 0.85v nr r = += + open-circuit protection (ockp) the MP4034 has open-circuit protection (ockp). if the ? 0.15v falling edge of v fb can not be monitored?which means the feedback loop is open?the MP4034 immediately shuts off the driving signals and enters hiccup mode. the MP4034 resumes normal operation when the fault has been removed. thermal shutdown (tsd) when the temperature of the ic exceeds 150c, the over-temperature protection is enacted and the ic enters auto-recovery mode. when the temperature falls below 120c, the ic resumes working.
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 13 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information component selection input filter input filter produces a dc source through the rectifier from the ac input power figure 9 shows the input filter and figure 10 shows the typical dc bus voltage waveform. figure 9: input filter figure 10: dc input-voltage waveform bulk capacitors c1 and c2 filter the rectified ac. inductor l forms a filter with c1 and c2 to restrain the differential-mode emi noise. the resistor (r) in parallel with the inductor (l) restrains the mid-frequency-band emi noise. normally, r is selected between 1k ? and 10k ? . the dc input capacitors, c1 and c2, are usually 2f/w to 3f/w for the universal input condition. for a 230vac single-range application, the capacitor can be half that value. normally, the minimum dc voltage should not be too low to ensure the converter can supply the maximum power to the load which can be express as follows: s p dc(min) f d ss d n v(nvv) n1d ??+ ? ? if the v dc(min) can not satisfy this express, increase the value of the input capacitors to increase the v dc(min) . output diode use a schottky diode because of its fast switching speed and low forward voltage drop for better efficiency. if a lower average efficiency (3%-4%) is acceptable, replace the output diode with a pn- junction diode or other non-schottky diode to lower costs. leakage inductance the transformer leakage inductance will decrease the system efficiency and affect the output current constant precision. the transformer structure should be optimized to improve the primary side and secondary side coupling and minimize the transformer leakage inductance of transformer. aim for a leakage inductance that is less than 5% inductance. rcd snubber the transformer leakage inductance causes the mosfet drain voltage spike and the excessive ringing on the drain voltage waveform. the rcd snubber circuit can limit this drain voltage spike. figure 11 shows the rcd snubber circuit. figure 11: rcd snubber
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 14 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. select r sn and c sn for an acceptable voltage spike and better system operation. the power dissipated in the snubber circuit is approximately: 2 sn sn k pk s sn ps o v 1 pli f 2vnv =? ? ? ? where: ? l k is the leakage inductance, ? v sn is the clamp voltage, ? n ps is the turn ratio of primary and secondary side. the power consumed in the snubber resistor (r sn ), the resistor (r sn ) is: 2 sn sn sn v r p = the maximum ripple of the snubber capacitor voltage is: sn sn sn sn s v v crf = ?? generally, a 15% ripple is reasonable. use the previous equation to approximate c sn . the damping resistor (r) in series with the rcd has a relatively large value to prevent any excessive ringing voltage that can affect the emi. use a damping resistor of about 200 ? to 500 ? to limit the drain voltage ringing. resistor divider for better application performance, use a resistor divider with values in the range of 10k ? to 100k ? to limit noise from adjacent components on the fb pin. connect a resistor with a value ranging from 1k ? to 2k ? from the fb pin to the resistor divider to limit substrate injection current effects, as shown in figure 12. figure 12: fb pin in series with on resistor dummy load a dummy load is required in open-output applications for good over-voltage protection. use a dummy load of ~10mw for good load regulation. maximum switching frequency because of the parameter tolerance of the sampling detecting time and inductance tolerances, select a secondary-side-diode conduction time that exceeds 5.4s as follows. sm s _ on pk po d nl ti 5.4s n(v v) ? = ?> ?+ for high or low temperature operation, select a maximum switching frequency below 75khz.
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 15 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pcb layout guide pcb layout is very important to achieve reliable operation, and good emi and thermal performance. the use design guide as follows to help optimize performance. 1. minimize the loop area formed by the input capacitor, the MP4034 drain-source, and the primary winding to reduce emi noise. 2. the copper area connected to source pins acts as a heat sink. provide a large copper area to improve the thermal performance. 3. minimize the clamp circuit loop to reduce emi. 4. minimize the secondary loop area of the output diode and output filter to reduce the emi noise. in addition, provide a sufficient copper area at the anode and cathode terminal of the output diode for heat dissipation. 5. place the ac input away from the switching nodes to minimize the noise coupling that may bypass the input filter. 6. place the bypass capacitor as close as possible to the ic and source. 7. place the feedback resistors at the fb pin and minimize the feedback sampling loop area to minimize noise coupling. 8. use a single point connection at the negative terminal of the input filter capacitor for the MP4034 source pin and bias winding return. figure 13 shows a layout example. top layer bottom layer figure 13: pcb layout design example below are design examples following the application guidelines for the given specifications: table 1: design example example 1 v in 85vac-265vac v out 40v i out 0.13a example 2 v in 85vac-265vac v out 10v i out 0.35a figure 14 and figure 15 show the detailed isolated application, while figure 16 and figure 17 show the detailed non-isolated application. these examples were used in the typical performance characteristics section. for more applications, please refer to the related evaluation board datasheets.
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 16 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application circuits l n s1ml/1000v/ 1a figure 14: typical application example universal input, driving 14 leds in series, 130ma led current, 6w isolation flyback converter u1 2.2nf/630v c3 pgnd agnd pgnd pgnd 499k r2 led+ led- l n n p n p_au fr1 1mh/0.1a l1 10k/0805 r1 bav21w d2 10/1w 200v/0.2a 1206 600v/0.5a 10v/0.35a 85vac~265vac 13.3k/1% r5 pgnd n s d1 wsrgc10mh 5 2 4 3 6 1 t1 10k r7 ee13 n p :n p_au :n s =95:23:19 1206 1206 pgnd agnd bd1 mb6s 1kv/1a d3 es1d/200v/1a 510 r3 0805 1206 20/0805 r4 lp=1.1mh 1nf/4kv cy1 c2 2.2uf/400v 4.7uf/400v c1 22uf/16v c5 32.4k/1% r6 4.7uf/50v c4 vcc 1 gnd 2 fb 3 gnd 4 gnd 5 gnd 6 drain 8 MP4034/soic8-7a figure 15: typical application example universal input, driving 3 leds in series, 350ma led current, 3.5w isolation flyback converter
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 17 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. figure 16: typical application example universal input, driving 14 leds in series, 150ma le d current, 6w non-isolated buck-boost converter figure 17: typical application example universal input, driving 3 leds in series, 350ma led current, 3.5w non-isolated buck-boost converter
MP4034 ? offline led driver MP4034 rev. 1.02 www.monolithicpower.com 18 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. flow chart start monitor v cc v cc > n monitor v fb monitor v cc y v cc < y n cc operation v fb >6.35v n n ockp operation y shut off switching pulse v fb >-0.15v for entire cycle v fb >4.0v first level ovp cv operation y y n discharge vcc to off threshold v ccl v cch
MP4034 ? offline led driver notice: the information in this document is subject to change without notice. users should warrant and guarantee that third party i ntellectual p roperty r ights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP4034 rev. 1.02 www.monolithicpower.com 19 12/4/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information soic8-7a 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o see detail "a" 0.0075(0.19) 0.0098(0.25) 0.150(3.80) 0.157(4.00) pin 1 id 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.004(0.10) 0.010(0.25) 0.189(4.80) 0.197(5.00) 0.053(1.35) 0.069(1.75) top view front view 0.228(5.80) 0.244(6.20) side view 14 85 recommended land pattern 0.213(5.40) 0.063(1.60) 0.050(1.27) 0.024(0.61) note: 1) control dimension is in inches . dimension in bracket is in millimeters . 2) package length does not include mold flash , protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming ) shall be 0.004" inches max. 5) jedec reference is ms-012. 6) drawing is not to scale . 0.010(0.25) bsc gauge plane

▲Up To Search▲

Price & Availability of MP4034

	To Download MP4034 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .