5 4 3 2 1 VLOW +VOUT 3.9K 1/4W 3.9K 1/4W opt. 1/4W R2 R1 240 1/4W R4 240 1/4W VIN 240 1/4W 100 1W R73 240 1/4W +Vin 100 U6 LTC4440-EMS8E D24 12V BAS21 U5 LTC4440-EMS8E Q27 123 VCC 10 2 4 11 2 Q12 5678 5678 Q30 4 123 Q16 12V R3 + C14 1K 220pF A Note: UNLESS NOTED: All caps 25V; All resistors 0603 (1/16W) or 0805 (1/8W); Q3, Q4, Q8, Q11-15,Q23,Q24,Q27-Q30, Q32,Q33 Siliconix Si7852DP; Q7, Q9,Q25,Q26 Zetex FMMT619; Q10, Q16-18 Zetex FMMT718; D12, D14, D23, D24 BAS21; L2 Pulse PA0651; L1 PA1294.910; L5 Sumida CDEP105-1R3MC-50; L4 Coilcraft DO1608C-105; T5 Pulse PA0297; T1,T4 Pulse PA0526; D21,D22,D25 MURS120; C26 0.47uF 180pF 5VREF R58 10K R47 33K R83 0 C27 330pF C29 R15 68nF 1M Q26 opt. D28 R45 0 C53 opt. BAT54 C21 5 R11 opt. C30 2.2nF 250V 1 0.047uF R34 opt. +VOUT MF Q18 R93 100 1 1 TIMER 2 PVcc R91 1K 3 R92 39.2K Vcc 14 15 12 16 MF2 MF Q34 MMBT3904 C47 1uF 7 PGND 4 CSF- 11 R90 1.5K CSF+ ME2 5 CSE- 6 CSE+ -VOUT C48 1uF D16 MMBZ5240B 10V B -VOUT R40 D20 5.1V COLL REF R41 10K R42 9.53K 4 2 2 6 0 R9 C +VOUT 2.7K RTOP COMP 4 8.25K 8 C22 opt. 7 MMBT3904 R98 C40 2.2nF 1 R38 330 3 16 SS 7 Q35 43 -VOUT ME R51 33 C23 0.022uF 8 U3 LT1431CS8 R46 2.49K MMBZ5231B -VOUT A R12 CT Q37 opt. opt. C56 opt. CUSTOMER NOTICE R13 0 CONTRACT NO. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS DATE CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO DRAWN June Wu 9/13/02 TITLE VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL CHECKED APPLICATION. COMPONENT SUBSTITUTION AND PRINTED LTC3722EGN-1, CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT APPROVED PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.ENGINEER Kurk Mathews 9/13/02 DESIGNER 4 3 2 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 36-72Vin to 12V/35A Isolated Supply SIZE CAGE CODE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND Wednesday, January 14, 2015 SCALE: SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 R82 0 470 1/4W C57 opt. V+ OUTF PGND 22 GND 23 FB RLEB 5 6 SPRG C28 R81 0 +VOUT SYNC R37 ISO1 MOC207 R43 750 3 C31 1.0uF P4 321 C50 330pF 5VREF 200K R71 C41 220pF R80 0 MF R88 4.87K 1/4W GND 5 R95 OUTE 15 17 OUTC OUTD 20 ISNS CS 13 CT D 19 C OUTB 21 OUTA R44 5.1K R87 1.5K 8 8 RMID 0 C24 1.0uF 20.0K 0.1uF GND-S COMP R57 22 9 GND-F R22 30.1k C32 R56 R79 0 R89 2.21K R50 33 R94 100 5 5VREF CT UVLO B R78 0 VLOW ME C49 220pF U2 LTC3722EGN-1 VIN 14 12 SBUS 24 18 C16 4 C43 22pF 9 11 10 2 R39 150 ADLY 20K R18 182k R53 PDLY A SBUS VREF R30 LTC3901EGN T5 OPT. 22pF 12V C 18.2K C42 VIN U1 1 R14 321 4 Q17 R66 ADLY B 321 4 + C13 C36 180uF 180uF 16V 16V +VOUT VHIGH MMBZ5226B 6 PDLY 5VREF R55 80.6K PDLY R32 4.99K R31 OPT. R28 OPT. ADLYR54 5VREF 80.6K B R33 R65 4.99K 18.2K 4 Q25 1 R85 4.87K 1/4W SYNC R27 OPT. SBUS 321 + 8765 T4 5:5(105uH):1:1 D14 OPT. NC R26 OPT. 4 321 Q33 8765 6 1.0mH C20 OPT. 4 Q24 8765 D12 7 R25 OPT. C19 1 R24 OPT. 321 Q15 8765 4 R77 0 R86 2.21K DPRG R23 OPT. R49 0.020 1.5W 321 Q14 8765 4 R76 0 P_LEG A_LEG 8 VIN D26 3.3V 68uF 20V Q32 -Vout L4 100 8765 PGND2 R48 0.020 1.5W R84 Q23 8765 321 123 C ISNS Q13 4 7 4 opt 8765 8 Q11 Q9 R62 D P2 D25 MURS120 VHIGH 12V +Vout 12V/35A 7 10 R64 0 +VOUT L1 8 0.85uH R75 100 1W 123 A_LEG MD 123 11 GND2 Q10 4 0 C35 0.22uF Q29 4 123 4 R74 100 1W 13 4 TG 5678 R61 opt IN R60 7 4 5678 10 Q8 5 6 7 8 6 BOOST -VOUT Q28 5678 L2 150nH P_LEG Q7 R63 0 B C58 0.1uF 16V 12V MB 123 0 P_LEG C34 0.22uF -Vin 123 R59 7 1 TS GND GND TG 4 C7 470pF 200V D 1 2 P3 IN 4 6 C1 0.82uF 100V R10 VHIGH VLOW 0.47uF 100V Q4 4 2 1 C59 0.1uF 16V BOOST TS A 8 C3 C4 C5 C46 0.82uF 0.82uF 0.82uF 0.82uF 100V 100V 100V 100V 4 2 C2 0.82uF 100V VCC 3 C T1 5:5(105uH):1:1 D216 0.47uF 100V C45 D22 3 5678 GND GND 5678 8 Q3 D23 BAS21 12V 36-72Vin C44 1W R8 240 1/4W 3 L5 1.3uH R7 R6 R72 ME P1 D R5 DWG NO REV A DC607A FILENAME: SHEET 1 1 OF 1