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MP4031 triac and analog dimmable, primary-side?controlled offline led controller with active pfc MP4031 rev.1.03 www.monolithicpower.com 1 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP4031 is a triac and analog dimmable, primary-side?controlled, offline led lighting controller with active pfc. it can output an accurate led current for an isolated lighting application with a single-stage converter. the proprietary real-current?control method can accurately control the led current using primary- side information. it can significantly simplify led lighting system design by eliminating secondary- side feedback components and the optocoupler. the MP4031 implements power-factor correction and works in boundary-conduction mode to reduce mosfet switching losses. the MP4031 has an integrated charging circuit at the supply pin for fast start-up without a perceptible delay. the proprietary dimming control expands the triac-based dimming range. the special current sense structure can implement analog dimming. the MP4031 has multiple protections that greatly enhance system reliability and safety, including over-voltage protection, overload protection, supply-pin under-voltage lockout, and over- temperature protection. all fault protections feature auto-restart. the MP4031 is available in an 8-pin soic package. features ? primary-side-control without secondary-side feedback ? internal charging circuit at the supply pin for fast start-up ? accurate line regulation ? high power factor ? operates in boundary conduction mode ? flicker-free, phase-controlled triac dimming with expanded dimming range. ? analog-dimming compatible ? cycle-by-cycle current limit ? over-voltage protection ? over-load protection ? over-temperature protection ? available in an 8-pin soic package applications ? solid-state lighting, including: o industrial and commercial lighting o residential lighting 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.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 2 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application analog dimming application emi filter n: 1 comp gnd d s vcc mult mp 4031 1 cs /dim zcd v a_dim analog with triac dimming application
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 3 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* package top marking MP4031gs soic8 MP4031 * for tape & reel, add suffix ?z (e.g. MP4031gs?z); package reference top view comp vcc 1 2 3 4 5 6 7 8 cs/dim mult zcd s gnd d soic8 absolute maxi mum ratings (1) input voltage vcc ........................-0.3v to +30v low-side mosfet drain voltage -0.7v to +30v zcd pin voltage ................................-8v to +7v other analog inputs and outputs .....-0.3v to 7v zcd pin current ..........................-5ma to +5ma continuous power dissipation (t a = +25c) (2) soic8 ........................................................ 1.3w junction temperature ...............................150c lead temperature ....................................260c storage temperature............... -65c to +150c recommended operating conditions (3) supply voltage vcc .........................11v to 27v operating junction temp (t j ).. -40c to +125c thermal resistance (4) ja jc soic8 ....................................96 ...... 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 power 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 operation conditions. 4) measured on jesd51-7 4-layer board.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 4 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics t a = +25c, unless otherwise noted. parameter symbol condition min typ max units supply voltage operating range v cc after turn on 10 27 v vcc upper level: internal charging circuit stops and ic turns on v cch 9.5 10 10.5 v vcc lower level: internal charging circuit trigger v ccl vcc falling, no fault 8.55 9 9.45 v vcc re-charge/ic turn-off level in fault condition v ccen vcc falling, fault occurs 6.45 7 7.55 v supply current vcc charging current from d i d_charge vd=16v, vcc=5v 12.5 15 17.5 ma quiescent current i q no switching, vcc=15v 800 1000 a quiescent current at fault i q_fault fault condition, ic latch, vcc=15v 180 220 300 a operating current i cc f s =70khz, vcc=15v 1 2 ma multiplier linear operation range v mult v comp from 1.9v to 4.9v 0 3 v v comp =2v, v mult =0.5v 0.84 1.06 1.26 1/v v comp =2v, v mult =1.5v 0.9 1.08 1.23 1/v gain k (5) v comp =2v, v mult =3v 0.93 1.1 1.25 1/v triac dimming off detection threshold v mul_off 0.13 0.15 0.17 v triac dimming on detection threshold v mul_on 0.32 0.35 0.38 v triac dimming off line-cycle blanking ratio d off_leb 25% error amplifier reference voltage v ref 0.386 0.4 0.414 v transconductance g ea guaranteed by design 250 a/v comp lower clamp voltage v compl 1.85 1.9 1.95 v max. source current i comp+ 57 a max. sink current without dimmer i comp- -300 a sink current at triac dimming off i sink_dim 60 70 80 a over-load detect threshold v comp_olp 4.85 5 5.15 v
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 5 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics (continued) t a = +25c, unless otherwise noted. parameter symbol condition min typ max units current sense comparator leading-edge blanking time leb 360 450 540 ns current sense upper clamp voltage v s clamp h 2.2 2.3 2.4 v current sense lower clamp voltage v s clamp l 0.12 0.15 0.18 v zero-current detector zero-current?detect threshold v zcd_t falling edge 0.32 0.35 0.37 v zero-current?detect hysteresis v zcd_hy 520 550 580 mv zero-current?detect leb v zcd_leb starts at gate turn off 1.8 2.5 3.1 s over-voltage threshold v zcd_ovp 5.2 5.5 5.8 v ovp detect leb ovp_leb starts at gate turn off 1.5 2 2.5 s minimum off time off_min 4.2 5.6 7 s starter start-timer period start 90 115 140 s internal main mosfet breakdown voltage bv dss_main v gs=0 30 v drain-source on-resistor r ds(on)_main i d =100ma 200 250 300 m ? notes: 5) the multiplier output is given by: vs=k?v mult ? (v comp -1.5)
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 6 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name pin function 1 mult internal multiplier input. connect to the tap of resistor divider from the rectified voltage of the ac line. the half-wave sinusoid signal to this pin provides a reference signal for the internal current control loop. the mult pin also detects the triac dimming phase. 2 zcd zero-current detection. a negative going edge triggers the internal mosfet?s turn-on signal. connect to the tap of a resistor divider from the aux iliary winding to gnd. zcd can also detect over-voltage and over-current conditions. over-voltage occurs if v zcd exceeds the over-voltage-protection (ovp) threshold after a 2s blanking time when the internal mosfet turns off. 3 vcc supply voltage. supplies power for both the cont rol signal and the internal mosfet?s gate driver. connect to an external bulk capacitor?typically 22f with a 100pf ceramic capacitor to reduce noise. 4 cs/dim current sense and analog dimming. an internal comparator compares the current sense voltage to the internal sinusoidal current reference to determine when the mosfet turns off. if the voltage exceeds the cu rrent-limit threshold of 2.3v after the leading edge blanking time and during the turn-on interv al, the gate signal turns off. in triac dimming, this pin is connected directly to s pin for current sens e, and in analog dimming, the analog dimming signal is added through this pin as the typical application shows. 5 s internal low-side main mosfet source. connect a resistor from this pin to gnd to sense the internal mosfet current. 6 d internal low-side main mosfet drain. this pin internally connects to vcc via a diode and a jfet to form an internal charging circuit for vcc. connect to the source of the high-side mosfet. 7 gnd ground. current return of the co ntrol signal and the gate drive signal. 8 comp loop compensation. connects to a compensation network to stabilize the led driver and accurately control the led driver current. the comp pin can also monitor for overload conditions: if the comp voltage rises above 5v, the overload protection triggers.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 7 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performance charac teristics v in =120vac, 7 leds in series, i o =350ma, v o =22v, lm=1.6mh, n p :n s :n aux =82:16:19, triac dimmable. i led 200mv/div. v cc 10v/div. v d 10v/div. v comp 1v/div. v s 1v/div. v zcd 2v/div. v d 10v/div. i in 100ma/div. v in 100v/div. i led 200ma/div. v cc 10v/div. v comp 1v/div. v d 10v/div. i led 200ma/div. v cc 10v/div. v comp 1v/div. v d 10v/div. i led 100ma/div. v mult 1v/div. v comp 1v/div. i in 200ma/div. i led 50ma/div. v mult 1v/div. v comp 1v/div. i in 200ma/div. i led 5ma/div. v mult 1v/div. v comp 1v/div. i in 200ma/div.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 8 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performance charac teristics v in =120vac, 7 leds in series, i o =350ma, v o =22v, lm=1.6mh, n p :n s :n aux =82:16:19, triac dimmable. conducted emi triac dimming curve 0 50 100 150 200 250 300 350 400 0.0 20.0 40.0 60.0 80.0 100.0 performance data 83.10% 82.60% 81.20% efficiency 21.64v 21.65v 21.62v vo (v) 0.364a 0.364a 0.36a io (a) 11.60% 9.50% 7.00% thd 0.982 0.99 0.993 pf 9.47w 9.54w 9.58w pin (w) 132v 120v 108v vin (vac) 83.10% 82.60% 81.20% efficiency 21.64v 21.65v 21.62v vo (v) 0.364a 0.364a 0.36a io (a) 11.60% 9.50% 7.00% thd 0.982 0.99 0.993 pf 9.47w 9.54w 9.58w pin (w) 132v 120v 108v vin (vac)
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 9 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performance charac teristics v in =120vac, 7 leds in series, i o =350ma, v o =22v, lm=1.6mh, n p :n s :n aux =82:16:19, analog dimmable. i led 200mv/div. v cc 10v/div. v d 10v/div. v comp 1v/div. v s 1v/div. v zcd 2v/div. v d 10v/div. i in 100ma/div. v in 100v/div. i led 200ma/div. v cc 10v/div. v comp 1v/div. v d 10v/div. i led 200ma/div. v cc 10v/div. v comp 1v/div. v d 10v/div. v cs 1v/div. v zcd 2v/div. v d 10v/div. v comp 1v/div. v zcd 2v/div. v comp 1v/div. v d 10v/div. v cs 500mv/div. v zcd 2v/div. v comp 1v/div. v d 10v/div. v cs 500mv/div.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 10 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performance charac teristics v in =120vac, 7 leds in series, i o =350ma, v o =22v, lm=1.6mh, n p :n s :n aux =82:16:19, analog dimmable. 0 50 100 150 200 250 300 350 400 012345678910
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 11 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. functional block diagram cur r ent sense current limit zcd s d mult comp cs/dim multiplier zero current detection gate driver control protection current control pw m / pfc triac phase detector emi filter n: 1 triac dimmer gnd vcc uvlo / en power supply real current cal cul ati on zero current detection gate control ovp otp latch off and counting figure 1: functional block diagram
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 12 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the MP4031 is a triac and analog dimmable, primary-side?controlled, offline led controller designed for high-performance led lighting. the MP4031 can accurately control the led current using the real-current?control method based on primary-side information. it can also achieve a high power factor to eliminate noise pollution on the ac line. the integrated vcc charging circuit can achieve fast start-up without any perceptible delay. the MP4031 is suitable for triac-based dimming with an extended dimming range. and the special current sense structure can implement analog dimming. boundary-conduction mode during the external mosfet on time ( on ), the rectified input voltage applied across the primary- side inductor (l m ) increases the primary current increases linearly from zero to the peak value (i pk ). when the external mosfet turns off, the energy stored in the inductor forces the secondary-side diode to turn on, and the inductor current decreases linearly from the peak value to zero. when the current decreases to zero, the parasitic resonance caused by the inductor and the combined parasitic capacitances decreases the mosfet drain-source voltage that is also reflected on the auxiliary winding (see figure 2). the zero-current detector generates the external mosfet turn-on signal when the zcd voltage falls below 0.35v after a blanking time and ensures the mosfet turns on at a relatively low voltage (see figure 3). v ds v bus +nv out i pri t off t on turn-on v zcd 0 inductor current i sec /n v bus i pk figure 2: boundary-conduction mode + vcc zcd auxiliary winding r zcd1 0.35v r zcd2 c zcd figure 3: zero-current detector as a result, there are virtually no primary-switch turn-on losses and no secondary-diode reverse- recovery losses. this ensures high efficiency and low emi noise. real-current control the proprietary real-current?control method allows the MP4031 to control the secondary-side led current based on primary-side information. the output led mean current can be calculated approximately as: fb o s nv i 2r ? ?
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 13 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. where: ? n is the turn ratio of the primary side to the secondary side, ? v fb is the feedback reference voltage (typically 0.4), and ? r s is the sense resistor between the mosfet source and gnd. power-factor correction the mult pin connects to the tap of a resistor divider from the rectified instantaneous line voltage. the multiplier output also has a sinusoidal shape. this signal provides the reference for the current comparator against the primary-side?inductor current, which shapes the primary-peak current into a sinusoid with the same phase as the input line voltage. this achieves a high power factor. inductor current multiplier output figure 4: power-factor correction the multiplier?s maximum output voltage to the current comparator is clamped to 2.3v to limit the cycle-by-cycle current. the multiplier?s minimum output voltage is clamped to 0.1 to ensure a turn- on signal during the triac dimming off interval, which pulls down the rectifier input voltage and accurately detects the dimming phase. vcc timing sequence initially, vcc charges through the internal charging circuit from the ac line. when vcc reaches 10v, the internal charging circuit stops charging, the control logic initializes and the internal main mosfet begins to switch. then the auxiliary winding takes over the power supply. however, the initial auxiliary-winding positive voltage may not be large enough to charge vcc, causing vcc to drop. instead, if the vcc voltage drops below the 9v threshold, the internal charging circuit triggers and charges vcc to 10v again. this cycle repeats until the auxiliary winding voltage is high enough to power vcc. if any fault occurs during this time, the switching and the internal charging circuit will stop and latch, and vcc drops. when vcc decreases to 7v, the internal charging circuit re-charges for auto-restart. 10v 9v vcc internal charging circuit and regulates the vcc auxiliary winding takes charge fault happens gate switching pulses 7v figure 5: vcc timing sequence auto start the MP4031 includes an auto starter that starts timing when the mosfet turns off. if zcd fails to send a turn-on signal after 122s, the starter will automatically sends a turn-on signal to avoid unnecessary ic shutdowns if zcd fails. minimum off time the MP4031 operates with a variable switching frequency; the frequency changes with the instantaneous input-line voltage. to limit the maximum frequency and get good emi performance, the MP4031 employs an internal minimum off-time limiter of 5s, as shown in figure 6. zcd gate 5.6us figure 6: minimum off time
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 14 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. leading-edge blanking in order to avoid premature switching-pulse termination due to the parasitic capacitances discharging when the mosfet turns on, an internal leading-edge blanking (leb) unit between the s pin and the current-comparator input blocks the path from the s pin to the current comparator input during the blanking time. figure 7 shows the leading-edge blanking. t leb = 450 ns v s t figure 7: leading-edge blanking output over-voltage protection (ovp) output over-voltage protection (ovp) prevents component damage from over-voltage conditions. the auxiliary winding voltage?s positive plateau is proportional to the output voltage, and the ovp monitors this auxiliary winding voltage instead of directly monitoring the output voltage as shown in figure 8. once the zcd pin voltage exceeds 5.5v, the ovp signal triggers and latches, the gate driver turns off, and the ic functions in quiescent mode. when the vcc voltage drops below the uvlo threshold, the ic shuts down and the system restarts. the output ovp set point can be calculated as: aux zcd2 out _ ovp sec zcd1 zcd2 nr v5.5 nr r ?? = + where: v out-ovp is the output ovp threshold, n aux is the number of auxiliary winding turns, and n sec is the number of secondary winding turns + 2us blanking vcc zcd auxiliary winding r zcd1 ovp signal 5.5v latch r zcd2 c zcd figure 8: ovp sampling circuit to avoid switch-on spikes mis-triggering ovp, ovp sampling has a ovps blanking period of around 2s, as shown in figure 9. v zcd 0v t o vps sampling here figure 9: zcd voltage and ovp sampling overload protection (olp) in the event of an output overload, the comp voltage rises. when the voltage reaches 5v, the ic will shut down and restart until vcc drops below uvlo. thermal shutdown to prevent internal temperatures from exceeding 150c and causing lethal thermal damage, the MP4031 shuts down the switching cycle and latched until vcc dropping below uvlo and restarts again. triac-based dimming control the MP4031 can be used in triac-based dimming application with the cs pin connected directly to the s pin. the triac dimmer usually consists of a bi-directional scr with an adjustable turn-on phase. figure 10 shows the leading-edge triac dimmer waveforms.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 15 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. line voltage after triac dimmer input line voltage before triac dimmer rectified line voltage dimmer turn on phase line cycle figure 10: triac dimmer waveforms the MP4031 detects the dimming turn-on cycle through the mult pin, which is fed into the control loop to adjust the internal reference voltage. when the mult voltage exceeds 0.35v, the device treats this signal as a dimmer turn-on signal. when the mult voltage falls below 0.15v, the system treats this as a dimmer turn-off signal. the MP4031 has a 25% line-cycle?detection blanking time with each line cycle, the real phase detector output adds this time, as shown in figure 11. that means if the turn-on cycle exceeds 75% of the line cycle, the output remains at the same maximum current. it improves the line regulation during the maximum triac turn-on cycle or without a dimmer. figure 11: dimming turn-on cycle detector if the turn-on cycle decreases to less than 75% of the line cycle, the internal reference voltage decreases as the dimming turn-on phase decreasing, and the output current decreases accordingly to implement dimming. as the dimming turn-on cycle decreases, the comp voltage also decreases. once the comp voltage reaches to 1.9v, it is clamped so that the output current decreases slowly to maintain the triac holding current and avoid random flicker. figure 12 shows the relationship between the dimming turn-on phase and output current. io triac dimming turn on cycle 100% 30% 75% v comp figure 12: dimming curve analog dimming the MP4031 is also available for analog dimming. with injecting an analog signal to the cs/dim pin. figure 13 shows a typical application circuit for analog dimming. the analog dimming signal is usually on the second side, so there will be isolation circuit (opto-coupler is used) to transfer the dimming signal from second side to the primary side. opto-coupler can only transfer pwm signal for high accuracy, so there will be interface circuit to change the analog dimming signal into pwm signal as figure 13 shows. the interface circuit is also used to change the logic of the second analog dimming signal, so that the output current will be direct proportion to the second analog dimming signal. then a 0v to 10v analog signal v a_dim is got on the primary side after these two steps. so the voltage at cs/dim pin ( v cs/dim ) is determined by the voltage at s pin ( ip*rs ) and v a_dim . the output led mean current ( io ) can be calculated
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 16 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. approximately as: p fb o 12 a_dim s p 12 12 i nv i rr 2 vri rr rr ? =? ?+ ?? ++ as the equation shows, the output current io decreases from max value to min, when v a_dim increasing from 0v to 10v. emi filter n: 1 com p gnd d s vcc m ult MP4031 1 cs /dim zcd v a_dim interface circuit isolation circuit rs ip power supply 0-10 v dimmer r1 r2 v cs/dim figure 13: typical application circuit for analog dimming
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 17 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ripple suppressor (innovative proprietary) for dimming led lighting application, a single stage pfc converter needs large output capacitor to reduce the ripple whose frequency is double of the grid. and in deep dimming situation, the led would shimmer caused by the dimming on duty which is not all the same in every line cycle. what?s more, the grid has noise or inrush which would bring out shimmer even flicker. figure 14 shows a ripple suppressor, which can shrink the led current ripple obviously. figure14: ripple suppressor principle: shown in figure 14, resister r, capacitor c, and mosfet m compose the ripple suppressor. through the rc filter, c gets the mean value of the output voltage v co to drive the mosfet m. m works in variable resistance area. c?s voltage v c is steady makes the leds voltage is steady, so the leds current will be smooth. mosfet m holds the ripple voltage v co of the output. diode d and zener diode d z are used to restrain the overshoot at start-up. in the start-up process, through d and d z , c is charged up quickly to turn on m, so the led current can be built quickly. when v c rising up to about the steady value, d and d z turn off, and c combines r as the filter to get the mean voltage drop of v co . the most important parameter of mosfet m is the threshold voltage v th which decides the power loss of the ripple suppressor. lower v th is better if the mosfet can work in variable resistance area. the bv of the mosfet can be selected as double as v co and the continues drain current level can be selected as decuple as the leds? current at least. about the rc filter, it can be selected by rc linecycle 50 / f . diode d can select 1n4148, and the zener voltage of d z is as small as possible when guarantee o ddz c_pp vv 0.5v +>? . optional protection circuit in large output voltage or large leds current application, mosfet m may be destroyed by over-voltage or over-current when led+ shorted to led- at working. gate-source(gs) over-voltage protection: + + n s d o d d z c o c d g r r o m r g figure 15: gate-source ovp circuit figure 15 shows gs over-voltage protection circuit. zener diode d g and resistor r g are used to protect mosfet m from gs over-voltage damaged. when led+ shorted to led- at normal operation, the voltage drop on capacitor c is high, and the voltage drop on gate-source is the same as capacitor c. the zener diode d g limits the voltage v gs and r g limits the charging current to protect d g . r g also can limit the current of d z at the moment when led+ shorted to led-. v dg should bigger than v th . drain-source over-voltage and over-current protection as figure 16 shows, npn transistor t, resistor r c and r e are set up to protect mosfet m from over-current damaged when output short occurs at normal operation. when led+ shorted to led-, the voltage v ds of mosfet is equal to the v co which has a high surge caused by the parasitic parameter. zener dioder d ds protects mosfet from over-voltage damaged. transistor t is used to pull down the v gs of m. when m turns off, the load is opened, mp4030 detects there is an ovp happened, so the ic functions in quiescent. the
MP4031?primary-side?control offli ne led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 18 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pull down point is set by r c and r e : co ce v r/r 0.7v 2 ?= . figure 16: drain-source ovp and ocp circuit mosfet list in the table 1, there are some recommended mosfet for ripple suppressor. table 1: mosfet list manufacture p/n manufacture v ds /i d v th (v ds =v gs @t j =25c) power stage si4446dy vishay 40v/3a 0.6-1.6v@ id=250 a <10w ftd100n10a ips 100v/17a 1.0-2.0v@ id=250 a 5-15w p6015cdg niko-sem 150v/ 20a 0.45-1.20v@ id=250 a 10-20w
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 19 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information components selection for triac dimming application it is the same with mp4030, please refer to an055 for detailed information. components selection for analog dimming application the bleeding and damping circuit are not needed in analog dimming application. the analog dimming signal v a_dim is divided by r1 and r2, and then connected to cs/dim pin. the selection of the current sense resistor ( rs ) is the same with mp4030, it is determined by the full-load output current. a 1k ? resistor is recommended for r1, which is much bigger than rs, so will not influence the output current when the dimmer is not connected. r2 is determined by the v a_dim , it can be calculated by the following equation approximately: a_dim_max r1 *v 0.8v r1 r2 = + this equation can get a min r2 to make sure the output current will be at full load with max dimming signal a_dim_max v . in most application, r2 need to be increased to enlarge the dimming ratio. and other components? selection can refer to an055.
MP4031?primary-side?controlled, offline led controller with pfc MP4031 rev.1.03 www.monolithicpower.com 20 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application circuit 22nf/275v cx1 df06s db1 1mh/0.5a l1 bav21w d7 mbrs3200t3g d2 l n 30k/1206 r9 led+ led- gnd gnd 2.2nf/250v cy1 22nf/630v c2 wsgc10mh d3 1m/1%/0.25w r10 2.2nf/50v c9 5.1k/1206 r14 5.1k/1206 r13 1k r1 330/2w r12 10 r5 1m/1%/0.25w r3 100nf/400v c3 22nf/50v c4 1n4148ws d1 450v/0.2a q1 ssn1n45bta mmbt3906lt1 q3 bzt52c15 d4 gnd gnd 5.9k/1% r17 300m/1%/1206 r18 1.1/1%/1206 r20 gnd 25.5k/1% r15 gnd 470k/1w r6 1n4148ws 1 d5 bzt52c16 d6 gnd cef04n7g q2 30v/500ma 108-305vac 95ts 25ts 20ts lp=1.74mh f1 tvr10431 rv1 gnd 3 1 4 6 11 7 pq2020 t1 250v/2a 100nf/630v c1 200v/0.2a 700v/4a 1kv/1a 200v/3a c10 1n4148ws d8 10k/0.25w r21 5.9k/1% r16 600v/1.5a 51/1206 r11 499k/1206 r2 470pf/1kv/1206 c11 c8 2.2mh/0.3a l2 2.2mh/0.3a l3 200k/1% r8 510/2w r7 510/2w r4 c7 200/1206 r22 10k/1% r23 mult 1 zcd 2 vcc 3 cs 4 s 5 d 6 gnd 7 comp 8 MP4031 u1 1k/1% r19 10k/1% r30 gnd 1kv/1a c12 499k//1206 r26 499k/1206 r25 2.43k/1% r27 68k/1% r28 mmbt3904lt1 q4 40v/200ma 3.92k r29 c5 c6 10pf/50v c13 1n4148ws d9 1n5383b d12 bzt52c27 d11 gnd bav21w d13 51/1206 r32 c14 gnd mmbt3904lt1 q5 c16 10k r33 tl431 u3 75k/1% r34 24k/1% r35 gnd u2 ns agnd c17 gnd 2.1k/1% r36 150k r37 1k r38 40v/200ma 10v 100nf/25v c15 dimming signal wsgc10mh d10 499k/1206 r31 499k/1206 r24 figure 17: 108-305vac input with pwm dimming, comp atible with 108-132v triac dimming, isolated flyback converter, drive 10 leds in seri es, 500ma led current for led lighting. evb model: ev4031-s-00a
MP4031?primary-side?controlled, offline led controller with pfc notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP4031 rev. 1.03 www.monolithicpower.com 21 5/8/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information soic8 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) drawing conforms to jedec ms-012, variation aa. 6) drawing is not to scale. 0.010(0.25) bsc gauge plane

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