5 4 3 2 1 REVISION HISTORY ECO REV __ 1 DESCRIPTION APPROVED PRODUCTION DATE DAVID B. 04-14-12 PULSE, PA0801=4:4:4 E1 4T 100 C29 33nF R51 13.3K R52 22K PGNDP 6 1 9 17 10 C28 10nF R53 8.25K C30 1nF C31 1nF + C9 68uF 16V C24 R40 PGNDP 2.2nF PGND 250V 1812 0 R42 OPT C25 C26 33nF 0ohms COG 0805 IS+ 18 IS- 17 VCC 28 NDRV 21 VAUX 24 VIN 22 R45 0 0402 R43 OPT 0402 PGND R44 56.2K VSOUT ITH VS+ 12 R56 1.00K FB 6 VCC C33 2.2nF C32 47pF C27 10uF 16V 1206 PGND B R50 R49 1.87K 604 SGND Fsw=240KHz C36 OPT 0402 OPT 0402 SGNDP SGNDP NOTE: 2.2uF 100V Murata GRM32ER72A225MA35 (X7R 1210) 22uF 16V Murata GRM32ER61C226ME20 (X7R 1210) 10uF 16V GRM31CR1C106K (1206 X5R) 2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812) 68uF 16V Sanyo 16TQC68M 33uF 100V Suncon 100ME33PX (10x12mm) L1 Vishay IHLP2525EZER1R5M01 L4 Pulse PA2729.802NL 0.004 ohm Panasonic ERJM1WTF4M0U (2512) 0.006 ohm Panasonic ERJM1WSF6M0U (2512) R27 SUSUMU, RL1220S-R75-F (0805) T1 PA0801NL T3 PA3493NL 5 3 1 R13 OPT 0402 VA Q8 OPT 1 D6 L5 3 2 2 0603 R12 A SGNDP R15 OPT PG C37 1.0nF VS- 13 R41 4.12K R46 R47 60.4K 15.0K VCC C R35 R36 1.82K 11.5K 11 +VOUT 7 AS SGD 25 PT- LTC3766EGN 19 U2 4 -VOUT IS+ C18 470pF PGND VAUX FS/SYNC 1T B R48 4.99K C8 68uF 16V R26 OPT 0603 C35 0.1uF MODE 1.25T 3 6 VCC 15 R39 ISMAG 5 T3 R33 0 0402 4 R38 100 1 + RSRS+ R24 R23 100 100 0402 0402 VPK 0402 Q7 FMMT491A PHASE C20 0.1uF 19.1K SGND C21 26 PT+ 1uF 0805 R21 0 R28 OPT 0402 5 C22 220pF R30 0 0402 R29 SG 1 AG 4 IS- 7 IN- 16 DELAY FS/UV 11 RCORE GND PGNDP PGND 13 SSFLT GND2 U1 LTC3765EMSE IN+ 15 FG R31 R32 0 0 0402 0402 PGND 12 RUN C23 1uF 0805 IS+ 8 PG 2 NDRV 14 4 3 VCC 1nF C17 0.1uF R27 0.75 AS 0805 1/3W 27 C16 3 R25 10K C12 22uF 16V 1210 E4 PGND 1.82K 1206 2 D5 ZHCS400 C11 22uF 16V 1210 C10 1nF 630V 1206 C15 OPT 50V R22 D4 ES1PD 4 D 12V / 12.5A J4 SGND PGND FG 2 5 6 7 8 SGNDP R20 100 R19 100 1 ES1PD R5 68.1K 1206 321 GND 2 R18 100K 0805 Q6 FDC2512 6 5 2 1 R17 61.9K 0805 1 C RS+ R11 75 0805 Q5 IRF6217 PGNDP D3 ZHCS400 R4 68.1K 1206 0.004 2512 14 R14 0.006 2512 VIN RS- R10 321 SW 23 E2 C13 1.0uF 100V 1210 C14 0.1uF 1206 123 4 D1 +VOUT J3 1 Q4 4 FDMS86200 REGSD 4 0 0402 R37 909 0805 FG E3 +VOUT IPK Q1 FDMS86201 2 8765 16 R9 J2 C7 OPT 0805 8765 Q3 FDMS86322 5678 PG -VIN 7 L4 8.0uH 10 Q2 OPT R7 909 0805 VSEC 3 C5 2.2uF 100V 1210 SS C4 2.2uF 100V 1210 9 C3 2.2uF 100V 1210 2 FGD/SWB 20 C2 2.2uF 100V 1210 PGND RUN C1 33uF 100V 5 4T 3 4 4T 2 8 + 11 RS- 2 18 to 72 VIN VIN 1 J1 6 51.1 1206 1 2 3 +VIN C6 47pF 200V 1206 1 1 D R1 VA T1 L1 1.5uH VAUX VPK OPT C34 OPT 1206 OPT SGNDP +VOUT R54 0 0402 PGND 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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. Unless otherwise specified: All resistors are in ohms 0603. All capacitors are in microfarads 0603. All capacitors are 25V. 1/16W = 0402, 1/10W = 0603, 1/8W = 0805, 1/4W = 1206, 1W = 2512. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 APPROVALS PCB DES. AK APP ENG. dkb TECHNOLOGY TITLE: SCHEMATIC SIZE N/A SCALE = NONE 2 DATE: IC NO. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only ACTIVE CLAMP FORWARD CONVERTER WITH DIRECT FLUX LIMIT LTC3765EMSE, LTC3766EGN DEMO BOARD 1739A-B Friday, June 15, 2012 SHEET 1 1 REV. 1 OF 1 A