DEMO MANUAL DC607A LTC3722, LTC4440, LTC3901, and LT1431 Isolated Full Bridge Converter DESCRIPTION Demonstration circuit 607A is an isolated full bridge converter featuring the LTC3722, LTC4440, LTC3901, and LT1431. This circuit was designed to demonstrate the phase-shifted full bridge power supply to generate 12V at 35A from a typical telecom input voltage range of 36V to 72V. Isolation voltage is 1500VDC. Fixed zero-voltage transition timing was chosen because of the relatively fast PERFORMANCE SUMMARY SYMBOL PARAMETER VIN Input Supply Range VOUT Output Voltage IOUT Output Current Range fSW Switching (Clock) Frequency VOUT(P-P) Output Ripple bridge leg transition times with a 48V input. The DC607A PCB layout includes options to implement adaptive timing. Design files for this circuit board are available at http://www.linear.com/demo/DC607A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C CONDITIONS MIN TYP 36 MAX 72 12.0 200LFM 0 VIN = 48V, IOUT = 35A (20MHz BW) UNITS V V 35 A 200 kHz 200 mVP-P IREG Output Regulation Line and Load (9V to 36V, 0V to 8.4A) ±0.06 % POUT/PIN Efficiency VIN = 48V, IOUT = 35A >92 % POUT/PIN Efficiency VIN = 48V, IOUT = 25A >93 % Isolation Basic Approximate Size Component Area × Top Component Height 1500 4.3 × 2.9 × 0.4 VDC Inches OPERATING PRINCIPLES The LTC3722 synchronous dual mode phase modulated full bridge controller is used on the primary and works together with the LTC3901 secondary side synchronous driver to provide a synchronous rectified output. When an input voltage is applied, the LTC3722 begins a controlled soft-start of the output voltage. As this voltage begins to rise, the LT1431 programmable reference is quickly powered up via the output voltage. The LT1431 provides feedback via opto-coupler ISO1 to set the output voltage at 12V. The LTC4440 high voltage gate driver is used to level shift the high side primary MOSFETs gate signals. The LTC3722 provides precise control of gate signals to primary MOSFETs and secondary MOSFETs via T3 and U1 (LTC3901). The LTC3901 includes a timer and current sense to limit reverse inductor current. For large values of input inductance, a 100V, 47µF electrolytic capacitor can be added across the input terminals to damp the input filter and provide adequate stability. See Linear Technology Application Note 19 for a discussion on input filter stability analysis. A recommended part is the Sanyo 100MV47AX. dc607af 1 DEMO MANUAL DC607A QUICK START PROCEDURE Demonstration circuit 607A is easy to set up to evaluate the performance of the LTC3722, LTC4440, LTC3901, and LT1431. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output (or input) voltage ripple by touching the probe tip and probe ground directly across the +Vout and –Vout (or +Vin and –Vin) terminals or input/output capacitors. See Figure 2 for proper scope probe technique. 1. Set an input power supply that is capable of 36V to 72V to a voltage of 36V. Then turn off the supply. 2. With power off, connect the supply to the input terminals +Vin and –Vin. a. Input voltages lower than 36V can keep the converter from turning on due to the undervoltage lockout feature of the LTC3722. b.If efficiency measurements are desired, an ammeter capable of measuring 15Adc or a resistor shunt can be put in series with the input supply in order to measure the DC607A’s input current. c. A voltmeter with a capability of measuring at least 72V can be placed across the input terminals in order to get an accurate input voltage measurement. 3. Turn on the power at the input. NOTE. Make sure that the input voltage never exceeds 72V. 4. Check for the proper output voltage of 12V ±1%. Turn off the power at the input. 5. Once the proper output voltage is established, connect a variable load capable of sinking 35A at 12V to the output terminals +Vout and –Vout. Set the current for 0A. a. If efficiency measurements are desired, an ammeter or a resistor shunt that is capable of handling 35Adc can be put in series with the output load in order to measure the DC607A’s output current. b.A voltmeter with a capability of measuring at least 12V can be placed across the output terminals in order to get an accurate output voltage measurement. 6. Turn on the power at the input. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 7. Once the proper output voltage is again established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other desired parameters. dc607af 2 DEMO MANUAL DC607A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup GND VIN Figure 2. Measuring Input or Output Ripple dc607af 3 DEMO MANUAL DC607A QUICK START PROCEDURE Figure 3. Transient Response, 0A to 35A, 48VIN (200mV and 0.5ms/Div) dc607af 4 DEMO MANUAL DC607A QUICK START PROCEDURE Figure 4. Thermal Map, 48VIN, 12V at 35AOUT, 200LFM, Frontside Figure 5. Thermal Map, 48VIN, 12V at 35AOUT, 200LFM, Backside dc607af 5 DEMO MANUAL DC607A QUICK START PROCEDURE Figure 6. Thermal Map, 48VIN, 12V at 35AOUT, 400LFM, Frontside Figure 7. Thermal Map, 48VIN, 12V at 35AOUT, 400LFM, Backside dc607af 6 DEMO MANUAL DC607A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R, 0.82µF, 100V, 10%, 1812 VITRAMON, VJ1812Y824KXBAT Required Circuit Components 1 6 C1, C2, C3, C4, C5, C46 2 2 C24, C31 CAP., X7R, 1.0µF, 25V, 10%, 1206 AVX, 12063C105KAT2A 3 1 C7 CAP., NPO, 470pF, 200V, 10%, 1206 AVX, 12062A471KAT2A 4 1 C16 CAP., X7R, 0.1µF, 25V, 10%, 0805 AVX, 08053C104KAT2A 5 2 C13, C36 CAP., OSCON, 180µF, 16V, 20%, PANASONIC, 16SEP180M 6 1 C14 CAP., TANT., 68µF, 20V, 20%, 7343 AVX, TPSE686M020R0150 7 1 C21 CAP., X7R, 0.047µF, 25V, 10%, 0805 AVX, 08053C473KAT2A 8 1 C23 CAP., X7R, 0.022µF, 25V, 10%, 0805 AVX, 08053C223KAT2A 9 1 C26 CAP., X7R, 0.47µF, 25V, 10%, 1206 AVX, 12063C474KAT2A 10 1 C27 CAP., NPO, 330pF, 25V, 10%, 0805 AVX, 08053A331KAT2A 11 1 C28 CAP., NPO, 180pF, 25V, 10%, 0805 AVX, 08053A181KAT2A 12 2 C32, C49 CAP., NPO, 220pF, 25V, 10%, 0805 AVX, 08053A221KAT2A 13 1 C29 CAP., X7R, 0.068µF, 25V, 10%, 0805 AVX, 08053C683KAT2A 14 1 C30 CAP., CER., 2.2nF, 250V, +20, –55% MURATA, DE2E3KH222MB3B 15 2 C34, C35 CAP., X7R, 0.22µF, 25V, 10% 0805 AVX, 08053C224KAT2A 16 1 C40 CAP., X7R, 2.2nF, 25V, 10%, 0603 AVX, 06033C222KAT2A 17 1 C41 CAP., NPO, 220pF, 25V, 10%, 0603 AVX, 06033AA221JAT2A 18 2 C42, C43 CAP., NPO, 22pF, 25V, 10%, 0603 AVX, 06033AA220JAT2A 19 2 C44, C45 CAP., X7R, 0.47µF, 100V, 10% 1210 TDK C3225X7R2A474K 20 2 C47, C48 CAP., X5R, 1µF, 25V, 10% 0603 AVX, 06033D105KAT2A 21 1 C50 CAP., NPO 330pF, 25V, 10% 0603 AVX, 06033A331KAT2A 22 2 C58, C59 CAP., X7R 0.1µF, 16V, 10%, 0603 AVX, 0603YC104KAT2A 23 3 D21, D22, D25 SUPER-FAST RECTIFIER, MURS120 DIODES INC., MURS120-13-F 24 4 D12, D14, D23, D24 DIODE, FAST SWITCHING DIODE, SOT23 DIODES INC., BAS21-7-F 25 1 D16 DIODE, 10V, SOT23, DIODES INC., MMBZ5240B-7-F 26 1 D20 DIODE, 5.1V, SOT23 DIODES INC., MMBZ5231B-7-F 27 1 D26 DIODE, 3.3V, SOT23 DIODES INC., MMBZ5226B-7-F 28 1 D28 DIODE, SCHOTTKY, SOT23 DIODES INC., BAT54-7-F 29 1 ISO1 I.C., OPTOISOLATORS, SO8 FAIRCHILD SEMI., MOC207M 30 1 L1 INDUCTOR, 0.85µH, PULSE, PA1294.910NL 31 1 L2 INDUCTOR, 150nH, PULSE, PA0651NL 32 1 L4 INDUCTOR, 1.0mH, DO1608C COILCRAFT, DO1608C-105 33 1 L5 INDUCTOR, 1.3µH, CDEP105 SUMIDA, CDEP105-1R3MC-50 34 4 Q7, Q9, Q25, Q26 XSTR., NPN, SOT23 ZETEX, FMMT619TA 35 16 Q3, Q4, Q8, Q11-Q15, Q23, Q24, Q27-Q30, Q32, Q33 N-MOSFET, Si7852DP, POWERPAK-SO-8 VISHAY, Si7852DP-T1-GE3 36 4 Q10, Q16-Q18 XSTR., PNP, SOT23 DIODE INC., FMMT718TA 37 2 Q34, Q35 XSTR., SWITCHING NPN, SOT23 DIODE INC., MMBT3904-7-F 38 2 R2, R5 RES., 3.9k, 1/4W, 5%, 1206 VISHAY, CRCW12063K90JNEA 39 5 R1, R4, R6, R8, R10 RES., 240Ω, 1/4W, 5%, 1206 VISHAY, CRCW1206240KJNEA 40 2 R3, R91 RES., 1k, 1/16W, 5%, 0603 VISHAY, CRCW06031K00JNEA dc607af 7 DEMO MANUAL DC607A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 41 1 R18 RES., 182k, 1/8W, 1%, 0805 VISHAY, CRCW0805182KFKEA 42 1 R22 RES., 30.1k, 1/8W, 1%, 0805 VISHAY, CRCW080530K1FKEA 43 1 R30 RES., 20k, 1/8W, 5%, 0805 VISHAY, CRCW080520K0JNEA 44 2 R32, R33 RES., 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA 45 1 R37 RES., 470Ω, 1/8W, 5%, 1206 VISHAY, CRCW1206470RJNEA 46 1 R38 RES., 330Ω, 1/8W, 5%, 0805 VISHAY, CRCW0805330RJNEA 47 1 R39 RES., 150Ω, 1/16W, 5%, 0805 VISHAY, CRCW0805150RJNEA 48 1 R40 RES., 2.7k, 1/16W, 5%, 0805 VISHAY, CRCW08052K70JNEA 49 1 R41 RES., 10k, 1/8W, 5%, 0805 VISHAY, CRCW080510K0JNEA 50 1 R42 RES., 9.53k, 1/8W, 1%, 0805 VISHAY, CRCW08059K53FKEA 51 1 R43 RES., 750Ω, 1/8W, 5%, 0603 VISHAY, CRCW0603750RJNEA 52 1 R44 RES., 5.1k, 1/16W, 5%, 0603 VISHAY, CRCW06035K10JNEA 53 1 R46 RES., 2.49k, 1/8W, 1%, 0805 VISHAY, CRCW08052K49FKEA 54 1 R47 RES., 33k, 1/16W, 5%, 0603 VISHAY, CRCW060333K0JNEA 55 2 R48, R49 RES., 0.020Ω 1.5W, 2%, 2512 IRC, LRC-LRF2512LF-01-R020-G 56 1 R53 RES., 22Ω, 1/8W, 5%, 0805 VISHAY, CRCW080522R0JNEA 57 1 R58 RES., 10k 1/16W, 5%, 0603 VISHAY, CRCW060310K0JNEA 58 2 R54, R55 RES., 80.6k, 1/16W, 1%, 0603 VISHAY, CRCW060380K6FKEA 59 1 R56 RES., 20.0k, 1/16W, 1%, 0603 VISHAY, CRCW060320K0FKEA 60 2 R65, R66 RES., 18.2k, 1/16W, 1%, 0603 VISHAY, CRCW060318K2JNEA 61 1 R71 RES., 8.25k, 1/16W, 1%, 0603 VISHAY, CRCW06038K25FKEA 62 4 R72-R75 RES., 100Ω, 1W, 5%, 2512 VISHAY, CRCW2512100RJNEA 63 1 R84 RES., 100Ω, 1/4W, 5%, 1206 VISHAY, CRCW1206100RJNEA 64 2 R85, R88 RES., 4.87k, 1/4W, 1%, 1206 VISHAY, CRCW12064K87FKEA 65 2 R86, R89 RES., 2.21k, 1/16W, 1%, 0603 VISHAY, CRCW06032K21FKEA 66 2 R87, R90 RES., 1.50Ω, 1/16W, 1%, 0603 VISHAY, CRCW06031K50FKEA 67 1 R92 RES., 39.2k, 1/16W, 1%, 0603 VISHAY, CRCW060339K2FKEA 68 1 R93 RES., 100Ω, 1/16W, 5%, 0603 VISHAY, CRCW0603100RJNEA 69 1 R94 RES., 100Ω, 1/8W, 5%, 0805 VISHAY, CRCW0805100RFKEA 70 1 R95 RES., 200k, 1/16W, 5%, 0603 VISHAY, CRCW0603200KJNEA 71 1 R15 RES., 1M, 1/16W, 5%, 0603 VISHAY, CRCW06031M00JNEA 72 2 T1, T4 TRANSFORMER, PULSE, PA0526NL 73 1 T5 TRANSFORMER, PULSE, PA0297NL 74 1 U1 I.C., LTC3901EGN SSOP-16 LINEAR, LTC3901EGN#PBF 75 1 U2 I.C., LTC3722EGN-1, SSOP-24GN LINEAR, LTC3722EGN-1#PBF 76 1 U3 I.C., LT1431CS8, SO8 LINEAR, LT1431CS8#PBF 77 2 U5, U6 I.C., LTC4440EMS8E, MSOP-8/EXPOSED LINEAR, LTC4440EMS8E#PBF dc607af 8 DEMO MANUAL DC607A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components 1 0 C19, C20, C22, C53, C56, C57 CAP., 0805 OPT 2 0 Q37 (OPT.) XSTR., PNP, SOT23 OPT 3 0 R7 (OPT.) RES., 1206 OPT 4 0 R9, R11, R12, R14, R31, R61, R62 RES., 0603 OPT 5 15 R13, R57, R59, R60, R63, R64, R76-R83, R98 RES., 0 JUMPER, 0603 VISHAY, CRCW06030000Z0EA 6 0 R23-R28, R34 (OPT.) RES., 0805 OPT 7 1 R45 RES., 0 JUMPER, 0805 VISHAY, CRCW08050000Z0EA 8 2 R50, R51 RES., 33Ω, 1/8W, 5%, 0805 VISHAY, CRCW080533R0JNEA Hardware: For Demo Board Only 1 4 P1, P2, P3, P4 MICRO PINS, 0.08 PIN-SWAGE MOUNT KEYSTONE, 1455-2 2 4 STANDOFF STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833(SNAP ON) 3 1 PRINTED CIRCUIT BOARD DEMO CIRCUIT #607A dc607af 9 C59 0.1uF C3,C4,C5,C46 4x0.82uF 100V A 1 IN R22 30.1K R18 182K VIN C24 1.0uF 12V R39 150 C32 220pF 20K 1/4W R30 12 18 10 R32 4.99k B R65 18.2K 22pF C42 UVLO VIN SBUS C26 0.47uF 5VREF D23 7 6 C34 0.22uF 20.0K R56 22pF C43 R55 80.6K R48 0.020 1.5W A R3 220pF C28 180pF R44 5.1K B 1K R49 0.020 1.5W 1 C R47 33K IN D U6 7 C35 0.22uF C45 0.47uF 100V R53 22 + 12V Q16 Q9 12V CS MMBT3904 330pF 68nF C27 Q35 1M R15 8.25K C29 D28 R71 3 0.1uF C16 1 8 5 C30 2.2nF 250V 6 R43 750 2.2nF C40 200K D14 D12 T5 1(1.5mH):0.5 1.0mH L4 2 2 1 5 4 R86 2.21K R37 2.7K REF U3 R89 2.21K R42 9.53K -VOUT R46 2.49K 1 C23 22nF R41 10K C50 330pF PVCC C48 1uF D16 10V CUSTOMER NOTICE LINEAR TECHNOLOGY CORPORATION CONFIDENTIAL THIS CIRCUIT IS DISTRIBUTED TO CUSTOMERS ONLY FOR USE WITH LTC PARTS. C47 1uF R93 100 R91 1K Q34 MMBT3904 -Vout +VOUT -VOUT C31 1.0uF LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. -VOUT R92 39.2K +VOUT R51 33 Q26 Q18 R90 1.50K +VOUT LT1431CS8 8 470 1/4W R40 COLL C21 0.047uF D20 5.1V R50 R88 33 4.87K 1/4W +VOUT LTC3901EGN U1 1 Q17 Q25 +Vout 12V/35A +VOUT VHIGH C7 470pF 200V R1,R4,R6,R8,R10 5x240,0.25W=48 VLOW 0.85uH Q14,Q15,Q24,Q33 + 4xSi7852DP C13,C36 2x180uF 16V L1 -VOUT D25 C1 0.82uF 100V +VOUT R2,R5 2x3.9K,0.25W=2k Q12,Q13,Q23,Q32 4xSi7852DP R87 1.50K VHIGH SYNC C49 220pF R94 100 9 R85 4.87K 1/4W 7 8 10 11 7 8 10 11 ISO1 MOC207 R38 330 1 6 T4 5:5(105uH):1:1 Q11,Q30 2xSi7852DP 2xSi7852DP 4 2 R74,R75 2x100, 1W=50 Q4,Q28 4 C44 100V 0.47uF T1 5:5(105uH):1:1 D21 VLOW D22 ISNS 5VREF R95 3.3V 100 D26 R84 LTC4440-EMS8E C14 68uF 20V D TG BOOST 6 D24 R72,R73 2x100,1W=50 Figure 8. Schematic without Optional Components R58 10K C ISNS 12V Q8,Q29 2xSi7852DP 150nH L2 C58 0.1uF Q3,Q27 2xSi7852DP LTC3722EGN-1 U2 C41 R33 4.99k C R66 18.2K Q10 LTC4440-EMS8E 12V B Q7 U5 TG BOOST R54 80.6K 0.47uF, 100V TDK C3225X7R2A474K (1210) 0.82uF, 100V Vishay VJ1812Y824KXBAT (1812) 180uF, 16V Sanyo 16SP180M C14 AVX TPSE686M020R0150 C30 MuRata DE2E3KH222MB3B D21,D22,D25 MURS120T3 D23,D24,D12,D14 BAS21 D26 3.3V MMBZ5226B D28 BAT54 D16 10V MMBZ5240B D20 5.1V MMBZ5231B L1 PA1294.910 L2 Pulse PA0651 L4 Coilcraft DO1608C-105 L5 Sumida CDEP105-1R3MC-50 Q7,Q9,Q25,Q26 Zetex FMMT619 Q10,Q16,Q17,Q18 Zetex FMMT718 T1,T4 Pulse PA0526 5VREF T5 Pulse PA0785 -Vin C2 0.82uF 100V 3 VCC GND GND 4 2 3 VCC GND GND 36-72Vin 12V TS 8 VIN TS 8 11 ADLY 6 CSE+ 12 L5 1.3uH NC 8 CT 24 VREF 14 SYNC 1 SPRG 13 DPRG 2 9 PDLY 21 OUTA 20 OUTB RLEB 5 19 OUTC FB 6 3 4 2 PGND 22 GND 23 17 OUTD 16 OUTE 15 OUTF SS 7 2 5 COMP GND 8 6 GND2 10 RTOP RMID V+ GND-F PGND 4 4 GND-S COMP 7 4 PGND2 13 5 CSE- 2 ME 3 ME2 11 CSF+ 14 CSF- TIMER 7 15 MF 16 MF2 10 VCC +Vin DEMO MANUAL DC607A SCHEMATIC DIAGRAM dc607af C59 0.1uF C3,C4,C5,C46 4x0.82uF 100V A 1 IN R22 30.1K R18 182K VIN C24 1.0uF 12V R39 150 C32 220pF 20K 1/4W R30 12 18 10 R32 4.99k B R65 18.2K 22pF C42 UVLO VIN SBUS C26 0.47uF 5VREF D23 7 6 C34 0.22uF 20.0K R56 22pF C43 R55 80.6K R48 0.020 1.5W A R3 220pF C28 180pF R44 5.1K B 1K R49 0.020 1.5W R58 10K C 1 C ISNS 12V Q8,Q29 2xSi7852DP 150nH L2 C58 0.1uF Q3,Q27 2xSi7852DP LTC3722EGN-1 U2 C41 R33 4.99k C R66 18.2K Q10 LTC4440-EMS8E 12V B Q7 U5 TG BOOST R54 80.6K 0.47uF, 100V TDK C3225X7R2A474K (1210) 0.82uF, 100V Vishay VJ1812Y824KXBAT (1812) 180uF, 16V Sanyo 16SP180M C14 AVX TPSE686M020R0150 C30 MuRata DE2E3KH222MB3B D21,D22,D25 MURS120T3 D23,D24,D12,D14 BAS21 D26 3.3V MMBZ5226B D28 BAT54 D16 10V MMBZ5240B D20 5.1V MMBZ5231B L1 PA1294.910 L2 Pulse PA0651 L4 Coilcraft DO1608C-105 L5 Sumida CDEP105-1R3MC-50 Q7,Q9,Q25,Q26 Zetex FMMT619 Q10,Q16,Q17,Q18 Zetex FMMT718 T1,T4 Pulse PA0526 5VREF T5 Pulse PA0785 -Vin C2 0.82uF 100V 3 VCC GND GND 4 2 IN D U6 7 C35 0.22uF C45 0.47uF 100V R53 22 + 12V Q16 Q9 12V CS MMBT3904 330pF 68nF C27 Q35 1M R15 8.25K C29 D28 R71 3 0.1uF C16 1 8 5 C30 2.2nF 250V 6 R43 750 2.2nF C40 200K D14 D12 T5 1(1.5mH):0.5 1.0mH L4 2 2 1 5 4 R86 2.21K R37 2.7K REF U3 R89 2.21K R42 9.53K -VOUT R46 2.49K 1 C23 22nF R41 10K C50 330pF PVCC C48 1uF D16 10V CUSTOMER NOTICE LINEAR TECHNOLOGY CORPORATION CONFIDENTIAL THIS CIRCUIT IS DISTRIBUTED TO CUSTOMERS ONLY FOR USE WITH LTC PARTS. C47 1uF R93 100 R91 1K Q34 MMBT3904 -Vout +VOUT -VOUT C31 1.0uF LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. -VOUT R92 39.2K +VOUT R51 33 Q26 Q18 R90 1.50K +VOUT LT1431CS8 8 470 1/4W R40 COLL C21 0.047uF D20 5.1V R50 R88 33 4.87K 1/4W +VOUT LTC3901EGN U1 1 Q17 Q25 +Vout 12V/35A +VOUT VHIGH C7 470pF 200V R1,R4,R6,R8,R10 5x240,0.25W=48 VLOW 0.85uH Q14,Q15,Q24,Q33 + 4xSi7852DP C13,C36 2x180uF 16V L1 -VOUT D25 C1 0.82uF 100V +VOUT R2,R5 2x3.9K,0.25W=2k Q12,Q13,Q23,Q32 4xSi7852DP R87 1.50K VHIGH SYNC C49 220pF R94 100 9 R85 4.87K 1/4W 7 8 10 11 7 8 10 11 ISO1 MOC207 R38 330 1 6 T4 5:5(105uH):1:1 Q11,Q30 2xSi7852DP 2xSi7852DP 4 2 R74,R75 2x100, 1W=50 Q4,Q28 4 C44 100V 0.47uF T1 5:5(105uH):1:1 D21 VLOW D22 ISNS 5VREF R95 3.3V 100 D26 R84 LTC4440-EMS8E C14 68uF 20V D TG BOOST 6 D24 R72,R73 2x100,1W=50 Figure 9. Schematic with Optional Components R47 33K 3 VCC GND GND 36-72Vin 12V TS 8 VIN TS 8 11 ADLY 6 CSE+ 12 L5 1.3uH NC 8 CT 24 VREF 14 SYNC 1 SPRG 13 DPRG 2 9 PDLY 21 OUTA 20 OUTB RLEB 5 19 OUTC FB 6 3 4 2 PGND 22 GND 23 17 OUTD 16 OUTE 15 OUTF SS 7 2 5 COMP GND 8 6 GND2 10 RTOP RMID V+ GND-F PGND 4 4 GND-S COMP 7 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 4 PGND2 13 5 CSE- 2 ME 3 ME2 11 CSF+ 14 CSF- 15 MF TIMER 7 MF2 16 VCC +Vin DEMO MANUAL DC607A SCHEMATIC DIAGRAM dc607af 11 DEMO MANUAL DC607A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc607af 12 Linear Technology Corporation LT 0315 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015