5 4 3 2 1 REVISION HISTORY D11 10, 11 8, 7 6T C25 6 1 9 17 10 B PGNDP R48 4.99K C28 10nF C29 33nF R51 16.2K R52 21.5K PGNDP C30 OPT R53 8.25K C31 OPT 464K 2.2nF 250V PGND 1812 C44 1.0nF PGND C26 R42 33nF 0ohms 78.7K COG 0805 R12 OPT 0402 R6 18 R35 1.82K IS+ IS- 17 28 R45 R43 0 OPT 0402 0402 R44 102K VCC VS+ VS- VSOUT ITH LTC3766EGN C 0 VCC 21 U2 R40 IS+ FB 11 +VOUT C24 100 VS0 C18 2.2nF 7 R39 5 PT- AS R26 2.21K PGND 0402 SGD 25 VAUX 19 R38 100 1T 4 PT+ C35 0.1uF FS/SYNC 1.25T 3 26 1uF 0805 R33 0 0402 R24 100 0402 R23 100 0402 VCC 15 ISMAG 0.1uF 8 IN- 16 C21 R32 0 0402 NDRV SGND 6 R31 0 0402 R30 0 0402 20.0K T3 -VOUT E4 RS+ R34 0 MODE R29 C19 12nF 0805 1 R28 0 0402 FG 4 AS C20 15 C9 68uF 16V VPK 0402 Q7 OPT PGND 50V 1.82K 1206 20 4 AG IS- 7 8 IS+ 2 PG SSFLT RCORE R22 R21 0 22 1 11 PGNDP U1 LTC3765EMSE RUN DELAY 13 PGND C23 1uF 0805 R27 0.75 0805 1/3W C22 220pF GND2 2 4148 D5 ZHCS400 R25 10K AG IN+ GND 1 12 VCC FS/UV 3 E5 0.1uF 1nF NDRV 14 4 VCCP RUN 4 C16 3 D2 AG1 R20 100 + -VOUT C15 OPT 1 R19 100 C8 68uF 16V J4 RS- 1 2 3 R18 100K 0805 + SGND PGND D4 OPT 2 1 C17 Q6 2N7002 FDC2512-NL 6 5 2 1 R17 28.7K 0805 5 6 7 8 SGNDP D3 ZHCS400 R11 51.1 0805 Q5 IRF6217 C12 10uF 16V 1210 1206 D 321 VIN PGNDP 2 VIN C11 OPT 16V 1210 0.005 2512 24 R14 0.004 2512 RS+ VAUX E2 C14 0.1uF 1206 Q4 4 BSC190N15NS3/ FDMS86200 4 RS- R10 C10 2.2nF 630V 1206 IPK 123 FG 1 10 Q1 BSC028N06NS 4 0 0402 C Q3 BSC057N08NS3 C13 1.0uF 321 100V 1210 8765 R37 909 0805 R4 15K 2512 ES1PD 2 J2 -VIN 8765 2 D1 PHASE R9 -VIN C7 15pF 0805 2 5678 R7 909 0805 +VOUT 12V / 10A J3 5 Q2 OPT 3 4 3T 1 C39 1.0uF 50V 0805 +VOUT SG C5 10uF 50V 1210 PGND C4 10uF 50V 1210 SW 27 C3 10uF 50V 1210 05-21-13 +VOUT 2 C2 10uF 50V 1210 DATE DAVID B. E3 FG C1 100uF 50V + APPROVED PRODUCTION L4 16uH GND 9 - 36 VIN DESCRIPTION RS- 14 FG 12.4 1206 C6 47pF 200V 1206 23 VIN 1 R1 VA R2 6 OPT 0402 1 R3 PGND 5 OPT 0402 T1 SW Q9 OPT CHAMPS, G45R2-0603=3:6 SGND REGSD J1 2 16 L1 0.56uH 3 C43 OPT 3 OPT R57 OPT 0805 VSEC +VIN 1 SS E1 3 R60 OPT 0805 9 4 REV __ FGD/SWB D 3 1 2 1 +VIN 2 T4 ECO OPT RUN VIN R46 R47 60.4K 15.0K C32 C33 47pF 12 R56 100 R8 0 0402 13 6 VCC VS0 R41 14.7K C37 1.0nF R36 11.5K PGND C27 10uF 16V 1206 B R49 R50 C36 1.87K 604 1.5nF 0402 2.2nF Fsw=240KHz SGND SGNDP VA SW VCCP Q8 OPT 1 A NOTE: 10uF 50V Murata GRM32ER71H106KA12 (X7R 1210) 10uF 16V Murata GRM31CR71C106MA12 (X7R 1206) 10uF 16V GRM31CR1C106K (1206 X5R) 2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812) 68uF 16V Sanyo 16TQC68M 100uF 50V Suncon 50ME100PX (10x12mm) L1 Vishay IHLP2525EZER0R56M01 L4 Champs PQA2050-16-HX 0.004 ohm Susumu KRL6432D-C-R004-F-T5 (2512) 0.005 ohm Panasonic ERJM1WSF5M0U (2512) R27 SUSUMU, RL1220S-R75-F (0805) T1 Champs, G45R2-0603-XX (3:6) T3 COILCRAFT, CT8281-BL (1.25T:1T) 5 6 4 3 C42 OPT 0402 5 VAUX OPT OPT 0402 AG1 2 D10 1 2 C40 OPT 0805 1 VA D9 2 OPT VAUX L5 OPT VPK VA OPT 1 2 C34 OPT 1206 OPT D7 1 R55 OPT OPT 0805 PGND R59 CUSTOMER NOTICE 0 0402 TECHNOLOGY LT DAVID B. TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 N/A SCALE = NONE 2 DATE: +VOUT R54 0 0402 C38 OPT 0805 PGND APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. 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. 4 +VOUT R58 2 AG C41 D8 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 1739B-C Tuesday, May 21, 2013 SHEET 1 1 REV. 1 OF 1 A