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lt 8312 1 8312fa for more information www.linear.com/lt8312 typical application features description boost controller with power factor correction the lt ? 8312 is a power factor correction ( pfc) boost controller. a lt8312-based design can achieve a power factor of greater than 0.99 by actively modulating the input current, allowing compliance with most harmonic current emission requirements. the lt8312 is well suited for a wide variety of off-line applications. the input range can be scaled up or down, depending mainly on the choice of external components. efficiencies higher than 95% can be achieved with output power levels up to 250w. applications n pfc boost with minimum number of external com-ponents n v in and v out limited only by external components n active power factor correction n low harmonic distortion n overvoltage protection n energy star compliant (<0.5w no-load operation) n 16-lead msop package n industrial n aviation l , lt , lt c , lt m , linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. efficiency 90v to 265v ac 0.1f b1gbu404 10f 2.2f 499k 499k 1m 95.3k 560f 2 v out 400v0.5a 4.7pf 4.7f 100k 221k 100k 100k 2k 1m 1m 9.53k 0.01 8312 ta01a d3 d4 cmr5h-06 d2 20 20 4:1 ? ? v in v in_sense fb gate en/uvlo dcm lt8312 v c sense v ref ovp gnd intv cc power (w) 0 40 80 100 20 60 120 140 160 8312 g01 91 efficiency (%) 92 9493 95 9796 98 99 115vac 230vac 50hz universal input 200w pfc boost converter downloaded from: http:///
lt 8312 2 8312fa for more information www.linear.com/lt8312 pin configuration absolute maximum ratings en / uvlo ................................................................... 30 v v in ............................................................................ 42 v intv cc ...................................................................... 18 v fb ............................................................................... 3v v c ............................................................................... 5v v in ( sense ) ................................................................ 1 ma ovp ............................................................................. 4v sense ...................................................................... 0.4 v dcm ....................................................................... 3 ma operating temperature range ( note 2) .... C40 c to 125 c storage temperature range .................. C65 c to 150 c (note 1) 12 3 4 5 6 7 8 gndgnd gnd v ref ovp v c gndgnd 1615 14 13 12 11 10 9 sense gate intv cc en/uvlov in dcmfb top view ms package 16-lead plastic msop v in_sense ja = 125c/w order information lead free finish tape and reel part marking* package description temperature range lt8312ems#pbf lt8312ems#trpbf 8312 16-lead plastic msop C40c to 125c lt8312ims#pbf lt8312ims#trpbf 8312 16-lead plastic msop C40c to 125c lt8312hms#pbf lt8312hms#trpbf 8312 16-lead plastic msop C40c to 150c lt8312mpms#pbf lt8312mpms#trpbf 8312 16-lead plastic msop C55c to 150c consult lt c marketing for parts specified with wider operating temperature ranges . * the temperature grade is identified by a label on the shipping container . consult lt c marketing for information on nonstandard lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ( http:// www .linear.com/product/lt8312#orderinfo ) downloaded from: http:///
lt 8312 3 8312fa for more information www.linear.com/lt8312 electrical characteristics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. parameter conditions min typ max units input voltage range 10 38 v quiescent current v en/uvlo = 0.2v not switching 45 60 70 70 a a v in quiescent current, intv cc overdriven v intvcc = 11v 60 a v in shunt regulator voltage i = 1ma 40 v v in shunt regulator current limit 8 ma intv cc quiescent current v en/uvlo = 0.2v v en/uvlo = 1.5v, not switching 12.5 1.8 15.5 2.2 17.5 2.7 a ma en/uvlo pin threshold en/uvlo pin voltage rising l 1.21 1.25 1.29 v en/uvlo pin hysteresis current en/uvlo = 1v 8 10 12 a v ref voltage 0a load 200a load l l 1.97 1.95 2.0 1.98 2.03 2.03 v v sense current limit threshold 96 102 107 mv minimum sense current limit 3 mv sense input bias current current out of pin 15 a current sense blanking time 90 130 170 ns fb voltage l 1.22 1.25 1.28 v fb voltage line regulation 10v < v in < 35v 0.01 0.03 %/v fb pin bias current (note 3), fb = 1.25v, ovp = 1.35v 100 600 na fb error amplifier voltage gain v vc /v fb 180 v/v fb error amplifier transconductance i = 5a 170 mhos fb low detection voltage 0.1 v dcm current turn-on threshold current out of pin 80 a maximum oscillator frequency 400 khz linear regulator intv cc regulation voltage 9.8 10 10.4 v dropout (v in -intv cc ) i intvcc = C10ma, v in = 10v 500 900 mv current limit intv cc < 9.5v intv cc > 9.5v 12 80 25 120 ma ma gate drivert r gate driver output rise time c l = 3300pf 18 ns t f gate driver output fall time c l = 3300pf 18 ns gate output low (v ol ) 0.01 v gate output high (v oh ) intv cc C 50mv v note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the lt8312e is guaranteed to meet specified performance from 0c to 125c junction temperature. specification over the C40c and 125c operating junction temperature range are assured by design, characterization and correlation with statistical process controls. the lt8312i is guaranteed to meet specified performance from C40c to 125c operating junction temperature range. the lt8312h is guaranteed to meet performance specifications over the C40c to 150c operating junction temperature range. the lt8312mp is guaranteed to meet performance specifications over the C55c to 150c operating junction temperature range. high junction temperatures degrade operating lifetimes. operating lifetime is derated for junction temperatures greater than 125c. note 3: current flows out of the fb pin. downloaded from: http:///
lt 8312 4 8312fa for more information www.linear.com/lt8312 typical performance characteristics v ref vs temperature v ref vs v in sense pin threshold current vs temperature intv cc vs temperature intv cc vs v in en/uvlo threshold vs temperature v in i q vs temperature input voltage hysteresis current vs temperature v in shunt voltage vs temperature temperature (c) C50 0 50 75 C25 25 100 125 150 8312 g01 1.2 en/uvlo (v) 1.22 1.261.24 1.28 1.3 rising falling temperature (c) C50 0 50 75 C25 25 100 125 150 8312 g02 10 10.5 en/uvlo hysteresis current (a) 11 11.5 12 temperature (c) C50 0 50 75 C25 25 100 125 150 8312 g03 0 i q (a) 2010 30 40 6050 100 9080 70 v in = 12v v in = 24v temperature (c) C50 1.900 v ref (v) 1.925 1.975 2.000 2.025 2.1002.075 0 50 75 1.950 2.050 C25 25 100 125 150 8312 g04 v in = 24v with no load v in = 24v with 200a load v in (v) 10 1.95 v ref (v) 1.96 1.98 1.99 2 2.01 2.052.03 2.041.97 2.02 15 25 20 30 35 40 8312 g05 no load 200a load temperature (c) C50 0 sense current limit (mv) 20 60 80 100 120 0 50 75 40 C25 25 100 125 150 8312 g06 max i lim temperature (c) C50 9.5 intv cc (v) 9.75 10.25 10.5 0 50 75 10 C25 25 100 125 150 8312 g07 25ma load 10ma load no load v in (v) 5 15 25 30 10 20 35 40 8312 g08 9 intv cc (v) 9.2 9.4 9.6 9.8 10 10.2 temperature (c) C50 0 50 75 C25 25 100 125 150 8312 g09 39 v in shunt voltage (v) 39.5 40 40.5 41 41.5 42 i shunt = 1ma downloaded from: http:///
lt 8312 5 8312fa for more information www.linear.com/lt8312 typical performance characteristics thd vs output power power factor vs output power maximum v in shunt current vs temperature temperature (c) C50 0 50 75 C25 25 100 125 150 8312 g10 5 shunt current (ma) 6 7 8 9 10 power (w) 0 40 80 100 20 60 120 140 160 8312 g11 0 thd 10 3020 40 50 60 115vac 230vac 50hz power (w) 0 40 80 100 20 60 120 140 160 8312 g12 0.60 power factor 0.65 0.750.70 0.80 0.950.90 0.85 1.00 115vac 230vac 50hz pin functions gnd (pins 1, 2, 3, 7, 8): ground. v ref ( pin 4): voltage reference output pin, typically 2v. this pin drives a resistor divider for the ovp pin. can supply up to 200a.ovp ( pin 5): overvoltage protection. this pin accepts a dc voltage to compare to the voltage output information. when fb pin voltage is above the ovp, the part stops switching. this protects devices connected to the output. v c ( pin 6): compensation pin for internal error amplifier. connect a series rc from this pin to ground to compen- sate the switching regulator. a 100 pf capacitor in parallel helps eliminate noise.fb ( pin 9): voltage loop feedback pin. fb is used to regulate the output voltage.dcm ( pin 10): discontinuous conduction mode detection pin. connect a capacitor and resistor in series with this pin to the auxiliary winding. v in ( pin 11): input voltage. this pin supplies current to the internal start-up circuitry and to the intv cc ldo. this pin must be locally bypassed with a capacitor. a 42 v shunt regulator is internally connected to this pin. en/uvlo ( pin 12): enable/undervoltage lockout. a resis - tor divider connected to v in is tied to this pin to program the minimum input voltage at which the lt8312 will turn on. when below 1.25 v, the part will draw 60 a with most of the internal circuitry disabled and a 10 a hysteresis current will be pulled out of the en/uvlo pin. when above 1.25v, the part will be enabled and begin to switch and the 10a hysteresis current is turned off. intv cc ( pin 13): regulated supply for internal loads and gate driver. supplied from v in and regulates to 10 v (typical). intv cc must be bypassed with a 4.7 f capacitor placed close to the pin. gate ( pin 14): n- channel fet gate driver output. switches between intv cc and gnd. driven to gnd during shutdown state and stays high during low voltage states.sense ( pin 15): the current sense input for the control loop. kelvin connect this pin to the positive terminal of the switch current sense resistor, r sense , in the source of the nfet. the negative terminal of the current sense resistor should be connected to the gnd plane close to the ic.v in(sense) ( pin 16): line voltage sense pin. the pin is used for sensing the ac line voltage to perform power factor correction. connect a resistor in series with the line voltage to this pin. downloaded from: http:///
lt 8312 6 8312fa for more information www.linear.com/lt8312 block diagram 14 1.22v C + a7 a4 m2 v in r10 r1 r5 r9 r11 r13 r14 r3 v out r4 r6 8312 bd driver gate 15 sense q ss r master latch multiplier current comparator oscillator gnd 1, 2, 3, 7, 8 13 intv cc m1 c5 c3 c2 c6 l1 v in r2 C + a1 one shot v600mv q1 + C C + start-up internal reg a3 a6 C + a8 1.22v vc c4 6 fb 9 v ref r8 4 ovp 5 en/uvlo 12 dcm 10 v in(sense) 16 11 c1 l2 d2 d1 a2 downloaded from: http:///
lt 8312 7 8312fa for more information www.linear.com/lt8312 operation the lt8312 is a power factor correction boost controller ic. it provides high power factor and low harmonic distor- tion in applications with current mode control and critical conduction mode. active power factor correction is becoming a require - ment for offline power supplies. a power factor of one is achieved if the current drawn is proportional to the input voltage. the lt8312 modulates the peak current limit with a scaled version of the input voltage. this technique can provide power factors of 0.97 or greater. the block diagram shows an overall view of the system. the external components are in a boost topology configu - ration. the auxiliary winding supplies power to the part in steady-state operation. the v in pin supplies power to an internal ldo that generates 10 v at the intv cc pin. the control circuitry consists of an error amplifier, a multiplier, a current comparator, and a master latch, which will be explained in the following sections. a comparator is used to detect discontinuous conduction mode ( dcm) with a cap connected to the auxiliary winding. the part features a 1.9a gate driver. the lt8312 is designed for off-line applications. the en/uvlo and a resistor divider are configured for a micropower hysteretic start-up. in the block diagram, r2 is used to stand off the high voltage supply voltage. the internal ldo starts to supply current to the intv cc pin when v in is above 2.5 v. the v in and intv cc capacitor are charged by the current from r2. when v in exceeds the turn-on threshold and intv cc is in regulation at 10 v, the part begins to switch. the v in hysteresis is set by the en/uvlo resistor divider. the auxiliary winding provides power to v in when its voltage is higher than the v in volt- age. a voltage shunt is provided for fault protection and can sink 8ma of current when v in is over 40v. during a typical cycle, the gate driver turns the external mosfet on and a current flows through the inductor. this current increases at a rate proportional to the input voltage. the control loop determines the maximum current and the current comparator turns the switch off when the current level is reached. when the switch turns off, the inductor current begins to flow through the diode con - nected to the output capacitor. this current decreases at a rate proportional to the difference between the output voltage and the input voltage. when the current decreases to zero, the output diode turns off and the voltage on the drain of the mosfet starts to oscillate from the parasitic capacitance and the inductor. the auxiliary winding has the same voltage across it as the main inductor and rings too. the capacitor connected to the dcm pin, c1, trips the comparator a2, which serves as a dv/dt detector, when the ringing occurs. the dv/dt detector waits for the ringing waveform to reach its minimum value and then the switch turns back on. this switching behavior is similar to zero volt switching and minimizes the amount of energy lost when the switch is turned back on and improves efficiency as much as 5%. since this part operates on the edge of continuous conduction mode and discontinuous conduc - tion mode, the operating mode is called critical conduction mode (or boundary conduction mode). the output voltage is regulated with a resistor divider connected to the fb pin. the output of the error amplifier is the vc pin. this node needs a capacitor to compensate the control loop.power factor correction when the v in(sense) pin is connected to the supply volt- age with a resistor, the current limit is proportional to the supply voltage. if the lt8312 is configured with a fast control loop, the vc pin would adjust to the changes of the v in(sense) . the only way for the multiplier to function is to set the control loop to be an order of magnitude slower than the fundamental frequency of the v in(sense) signal. in an offline application, the fundamental frequency of the supply voltage is 120 hz so the control loop unity gain frequency needs to be set less than approximately 12 hz. start-up the lt8312 uses a hysteretic start-up to operate from high offline voltages. a resistor connected to the supply voltage protects the part from high voltages. this resistor is connected to the v in pin on the part and bypassed with a capacitor. when the resistor charges the v in pin to a turn-on voltage set with the en/uvlo resistor divider and the intv cc pin is at its regulation point, the part begins to switch. the resistor cannot provide power for the part in downloaded from: http:///
lt 8312 8 8312fa for more information www.linear.com/lt8312 operation steady state, but relies on the capacitor to start up the part, then the auxiliary winding begins to provide power to the v in pin along with the resistor. an internal voltage clamp is attached to the v in pin to prevent the resistor current from allowing v in to go above the absolute maximum voltage of the pin. the internal clamp is set at 40 v and is capable of 8 ma ( typical) of current at room temperature. setting the v in turn-on and turn-off voltages a large voltage difference between the v in turn-on voltage and the v in turn-off voltage is preferred to allow time for the auxiliary winding to power the part. the en/uvlo sets these two voltages. the pin has a 10 a current sink when the pins voltage is below 1.25 v and 0 a when above 1.25 v. the v in pin connects to a resistor divider as shown in figure 1. the uvlo threshold for v in rising is: v in(uvlo,rising) = 1.25v ? r1 + r2 r2 + 10a ? r1 the uvlo threshold for v in falling is : v in(uvlo, falling) = 1.25v ? r1 + r2 r2 programming output voltage the output voltage is set using a resistor divider from the output capacitor to the fb pin. from the block diagram the resistors r3 and r4 form a resistor divider from the output capacitor. the output voltage equation is: v out = v bg ? r3 + r4 r5 the v bg voltage is equal to fb voltage in electrical speci- fication table. setting v in(sense) resistor the v in (sense) resistor sets the current feeding the internal multiplier that modulates the current limit for power factor correction. at the maximum line voltage, v max , the current is set to 360 a. under this condition, the resistor value is equal to (v max /360a). critical conduction mode operation critical conduction mode is a variable frequency switching scheme that always returns the inductor current to zero with every cycle. the dcm pin uses a fast current input comparator in combination with a small capacitor to detect dv/dt on the auxiliary winding. to eliminate false tripping, a blanking time of 200 ns is applied after the switch turns off. the detector looks for 80 a of current through the dcm pin due to falling voltage on the auxiliary winding when the output diode turns off. this is not the optimal time to turn the switch on because the switch voltage is still close to v out and would waste all the energy stored in the parasitic capacitance on the switch node. discontinuous ringing begins when the output diode current reaches zero en/uvlo lt8312 v in gnd r2 8312 f01 r1 figure 1. undervoltage lockout (uvlo) downloaded from: http:///
lt 8312 9 8312fa for more information www.linear.com/lt8312 operation and the energy in the parasitic capacitance on the switch node transfers to the input capacitor. this is a second- order network composed of the parasitic capacitance on the switch node and the main inductor. the minimum voltage of the switch node during this discontinuous ring is 2 v in -v out . the lt8312 turns the switch back on at this time, during the discontinuous switch waveform, by sensing when the slope of the switch waveform goes from negative to positive using the dv/dt detector. this switching technique may increase efficiency by 5%. at low current limits, the frequency of critical conduc - tion mode can become very high. the lt8312 features a maximum frequency clamp of 400 khz. the part operates in discontinuous conduction mode when the natural criti - cal conduction mode frequency is higher than 400khz.sense resistor selection the resistor, r sense , between the source of the external n- channel mosfet and gnd should be selected to provide an adequate switch current to drive the application without exceeding the current limit threshold. minimum current limit the lt8312 features a minimum current limit of approxi - mately 3% of the peak current limit. this helps improve the harmonic distortion during the input supplies off-line crossover period. universal input the lt8312 operates over the universal input voltage range of 90v ac to 265v ac. loop compensation the feedback loop is a traditional g m error amplifier. the loop crossover frequency is set much lower than twice the line frequency for pfc to work properly. in a typical application, the compensation capacitor is 1f.mosfet and diode selection with a strong 1.9 a gate driver, the lt8312 can effectively drive most high voltage mosfets. a low q g mosfet is recommended to maximize efficiency. in most applications , the r ds(on) should be chosen to limit the temperature rise of the mosfet. the drain of the mosfet is stressed to v out during the time the mosfet is off and the diode is conducting current. the diode is stressed to v out when the switch is on. the average current through the diode is equal to the load current.discontinuous mode detection the discontinuous mode detector uses ac-coupling to detect the ringing on the auxiliary winding. a 22 pf ca - pacitor with a 30 k resistor in series is recommended in most designs.power factor correction/harmonic content the lt8312 attains high power factor and low harmonic content by making the peak current of the main power switch proportional to the line voltage by using and internal multiplier. a power factor of >0.97 is easily attainable for most applications by following the design equations in this data sheet. with proper design, lt8312 applications can easily meet most harmonic standards. downloaded from: http:///
lt 8312 10 8312fa for more information www.linear.com/lt8312 typical applications universal input 150w pfc boost converter c144.7f r2610k 1% r19 0 d6 1n4148w r150.015 1206 8312 ta02 r14 100 q1 ipa50r190ce ? ? v in v in_sense fb gate en/uvlo dcm lt8312 v c sense v ref ovpgnd gnd gnd gnd gnd intv cc intv cc c5680nf c3100pf c84.7f 16v c9100pf 50v r13 1m 1206 r16 1m 1206 r11 10 1% r129.53k r102k c15100pf c10100f 450v c727pf c6 4.7nf c4 10f, 50v d3 cmz5934b d1 bav20w d2 bav20w r9 47 1206 d4 1n4005 d5 cmr5h-06 + r171m 1206 j2 400v/0.375a +C 12 r8 2.4m 1% r3 301k 1% r18 75k r411.8k 1% r7150k 1% 1206 r6150k 1% 1206 r2499k 1% 1206 r1499k 1% 1206 r524.9k 1% c131nf c12 1f l4 300h b1gbu404 3 2 c20.47f 4 ? ? j1 c1 0.22f z1 1 2 f13.15a l n 90-265vac l1 15mh 41 32 l3760802122 450h 10:1 37 126 1612 45 1 2 3 11 10 6 914 15 13 8 7 + downloaded from: http:///
lt 8312 11 8312fa for more information www.linear.com/lt8312 typical applications avionics input 60w pfc boost converter c14470nf r2682.5k 1% r19 0 d6 1n4148w r150.04 1206 8312 ta03 r14 100 q1 ipa50r190ce ? ? v in v in_sense fb gate en/uvlo dcm lt8312 v c sense v ref ovpgnd gnd gnd gnd gnd intv cc intv cc c527nf c3100pf c84.7f 16v c9100pf 50v r13 1m 1206 r16 1m 1206 r11 10 1% r129.53k r102k c15100pf c1047f 450v c727pf c6 4.7nf d3 cmz5934b d1 bav20w d2 bav20w r9 47 1206 d4 1n4005 d5 cmr2u-06 + r171m 1206 j2 400v/0.15a +C 12 r8 2.4m 1% r3 301k 1% r18 75k r411.8k 1% r7100k 1% 1206 r6100k 1% 1206 r2499k 1% 1206 r1499k 1% 1206 r524.9k 1% c131nf c12220nf l4 1mh b1kbp204g 3 2 c12100nf 4 ? ? j1 c1 47nf z1 1 2 f12.5a l n 97~134vac 400hz l1 27mh 41 32 l3760801130 750h 37 126 1612 45 1 2 3 11 10 6 914 15 13 8 7 c4 10f, 50v + downloaded from: http:///
lt 8312 12 8312fa for more information www.linear.com/lt8312 package description ms package 16-lead plastic msop (reference ltc dwg # 05-08-1669 rev a) msop (ms16) 0213 rev a 0.53 0.152 (.021 .006) seating plane 0.18 (.007) 1.10 (.043) max 0.17 C?0.27 (.007 C .011) typ 0.86 (.034) ref 0.50 (.0197) bsc 16151413121110 1 2 3 4 5 6 7 8 9 note:1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.254 (.010) 0 C 6 typ detail a detail a gauge plane 5.10 (.201) min 3.20 C 3.45 (.126 C .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.305 0.038 (.0120 .0015) typ 0.50 (.0197) bsc 4.039 0.102 (.159 .004) (note 3) 0.1016 0.0508 (.004 .002) 3.00 0.102 (.118 .004) (note 4) 0.280 0.076 (.011 .003) ref 4.90 0.152 (.193 .006) please refer to http:// www .linear.com/product/lt8312#packaging for the most recent package drawings. downloaded from: http:///
lt 8312 13 8312fa for more information www.linear.com/lt8312 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. revision history rev date description page number a 2/16 modified schematics. changed minimum current limit for intv cc . changed ovp pin description. 1, 14 36 downloaded from: http:///
lt 8312 14 8312fa for more information www.linear.com/lt8312 ? linear technology corporation 2015 lt 0216 rev a ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/lt8312 related parts typical application part number description comments lt3798 off-line isolated no opto flyback controller with active pfc v in and v out limited only by external components lt3752/lt3752-1 active clamp synchronous forward controllers with internal housekeeping controller input voltage range: lt3752: 6.5v to 100v, lt3752-1: limited only by eternal components lt3753 active clamp synchronous forward controller input voltage range: 8.5v to 100v lt8311 synchronous rectifier controller with opto-coupler driver for forward converters optimized for use with primary-side lt3752/lt3752-1, lt3753 and lt8310 controllers lt3748 100v isolated flyback controller 5v v in 100v, no opto flyback, msop-16 with high voltage spacing lt c ? 3765/ ltc3766 synchronous no opto forward controller chip set with active clamp reset direct flux limit, supports self starting secondary forward control ltc3723-1/ltc3723-2 synchronous push-pull and full-bridge controllers high efficiency with on-chip mosfet drivers, adjustable synchronous rectification timing ltc3722/ltc3722-2 synchronous full bridge controllers adaptive or manual delay control for zero voltage switching, adjustable synchronous rectification timing 90v to 265v ac 0.1f 10f 2.2f 499k 499k 1m 95.3k 560f 2 v out 400v0.5a 4.7pf 4.7f 100k 221k 100k 100k 2k 1m 1m 9.53k 0.01 8312 ta04 d3 d4 d2 20 20 4:1 ? ? v in v in_sense fb gate en/uvlo dcm lt8312 v c sense v ref ovp gnd intv cc universal input 200w pfc boost converter downloaded from: http:///

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