4 3 2 T1 PA0801 8 C83 47pF 5 C85 47pF NOTE: 1uF, 100V CER TDK C3225X7R2A105M(1210) 22uF, 16V CER TDK C3225X5R1C226M(1210) 39uF, 100V Sanyo 100ME39AX 47uF, 10V Taiyo Yuden LMK325BJ476MM-B(1210) 69uF, 16V Sanyo 6TQC68M L1 Vishay IHLP-2525CZER1R0M-01 L2 PULSE PA1393.302 Q26 FMMT618 Q32 FMMT718 T1 Pulse PA0801 (4:4:4) T2 Pulse PA0297 2(1.4mH):1:1 U2 R58 5.1K LTC3726EGN C78 33nF C30 2.2nF 250V R66 100K -VOUT -Vout 2 0 Q27 FCX491A VCC R75 opt. 3 16 C70 VCC 15 PT+ 14 PT- 12V 12A E8 R91 R83 R94 opt. D28 opt. R56 100 MMBZ5236B 7.5V SG -VOUT SG 1 C71 1uF R76 1K 1 R85 1200pF Q26 VSB PT- R61 100 5 R63 75K 6 4 R55 100 1% 909 FG 2 IS 10 GND PGND FS/IN- 11 C29 33nF 1200pF 1uF 6 C24 3 Q32 - -VOUT VCC C C23 opt. R41 11.5K FB/PH ITH R84 0 R53 opt. 1 C73 470pF LTC3725EMSE 9 C55 GATE 7 NDRV 3 ULVO 2 SSFLT R22 15.0K 4 U1 VSLMT 1 FB/IN+ T2 68uF 16V E4 FS/SYNC 4 8 VCC C72 0.1uF 68uF 16V 4 5 R54 Q25 100 1% Q33 opt. 7.5K R18 365K 0.004 1W VCC VA C31 22uF 16V + C80 321 R50 321 R95 R77 0 B R51 R52 1/4W 1/4W 56 56 220pF 3 C R1 1/4W 56 C33 22uF 16V + C68 4 VA 9 C27 R29 100K Q28 FDC2512 R48 0.025 1W 4 IS+ 11 6 5 2 1 100 C69 470pF 100V D 8765 VSW SLP 123 R3 8765 C66 330pF 200V 4 0 E2 7 7 R49 -Vin 2 IS- 10 5678 RUN/SS C5 1.0uF 100V +Vout E3 Q12 HAT2244WP R79 510 Q14 HAT2244WP 6 C4 1.0uF 100V 8 12 C3 1.0uF 100V C2 1.0uF 100V 9 GND 36V-72Vin 3 4 SW Q11 Q8 Si7450DP Si7450DP D E7 4 2.8uH PGND 1.0uH 1 10 8 E1 + L2 11 5 13 L1 +Vin 1 MODE 3 5 R68 15.0K R69 124K C77 47uF 10V C76 opt. C79 1.0nF R46 604 B C75 47pF -VOUT VSW VCC SG C82 68pF R93 3 R92 150 Q35 MMBT2907A 150 VSB D32 MMBZ5259B 39V 1 2N7002 D29 -VOUT 4 PT- 1N4148W R89 249 -VOUT 5 10pF Q34 2 A VSW C81 D31 1N4148W CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 CONTRACT NO. APPROVALS DRAWN DATE J. WU 11/1/06 CHECKED TECHNOLOGY TITLE A LTC3725EMSE, LTC3726EGN 100W, 36V - 72Vin to 12V/12A Isolated Forward Converter APPROVED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 K. Mathews 11/1/06 DESIGNER Monday, December 03, 2007 2 SIZE CAGE CODE SCALE: FILENAME: DWG NO REV DC1032A SHEET 1 A 1 OF 1