5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION APPROVED DATE PRODUCTION DAVID B. 10-29-14 2 R10 C55 1nF C113 33nF R150 14.3K 5 C66 47nF 200V 1206 AG1 C102 0.1uF 0805 Q29 IRF6217 B 3 R109 10K AS C119 1nF 2 1 D30 ZHCS506 Q31 OPT RUN C73 1nF + C26 OPT 12VOUT / 30A + C68 150uF 16V 7343 C78 33nF 0805 C105 0 R122 0 IS+ 2 3 C -SENSE E6 +VOUT 3.3nF SGND IS+ VSOUT ITH SGD 11 ITH R69 46.4K R125 17.4K R115 0 1/4W 1206 C74 0 18 17 IS- VCC 19 +SENSE E5 VS- OPT SYNC R124 0 R126 OPT 12 VS+ 13 VS- FS/SYNC 15 R43 OPT - E4 C70 0 28 21 VIN NDRV 22 24 VCC R123 118K R121 133K R107 OPT LTC3766EGN SSS -VOUT -VOUT VCC C103 R113 OPT 1206 MODE PT- RS+ R106 OPT Q27 FCX491A R116 VAUX U2 R118 681K D34 ES1PD 4 3 R140 274 1/8W 0805 C75 100pF C76 3.3nF R41 11.5K R42 1K 6 FB R119 OPT R120 VCC OPT R68 2.15K C79 4.7nF C77 4.7uF 1206 PGND R127 OPT 1/4W 1206 C9 OPT R46 604 B COG 1 SGNDP R112 0 PT- C112 0.22uF 200V 1210 +VOUT 150uF 16V 7343 VS+ VCC 4 AG 0 IPK ND PT+ C23 C25 + C7 150uF 16V 7343 0603 R137 1 R111 0 R7 RS0 VPK R138 OPT VAUX 26 25 AG AG1 C80 1nF 28.7K SGND 1uF 16V 0805 C111 10 4 R8 0 AS R117 12.7K 1T C71 R147 OPT PHASE AG 1.25T 6 0603 5 4 T2 + C31 150uF 16V 7343 J4 PGND OPT 1 IS+ R139 26.7K 16 1 + C33 C34 22uF 16V 1210 RUN R6 0 FG R146 0 R114 R103 0 C8 OPT R77 0 0805 OPT 1206 TRANS-PA3493NL 3 R101 100 PGND SG C101 0.1uF 220pF 0805 IN- DELAY UV R22 3.74K C72 15 R75 215 0805 -VOUT 7 8 2 PGND GND RCORE 1 SSFLT 9 11 GND2 C24 1uF 16V 0805 SGNDP LTC3765EMSE 17 13 C30 2.2nF 4 +VOUT 321 R108 250V 1812 U1 RUN PSS SGND -VIN IN+ 6 12 1N4148WS VCC FS/UV 3 2 10 D40 1 NDRV E7 RUN PG 4 14 3 VCP 4 RS- R102 RS+ 321 Q15 BSC028N06NS3 0 Q14 BSC028N06NS3 1225 Q24 OPT + J3 Q12 BSC028N06NS3 Q13 BSC028N06NS3 Q23 OPT PGND R18 102K 0805 R149 100 C118 1.5nF RS- SGNDP IS- C R148 100 ISMAG 6 5 2 1 3 R29 100K 0805 Q28 FDC2512 R136 0.005 1225/2512 PGNDP R52 3.0 1206 2 1 123 C10 2.2nF 630V 1206 FG R51 3.0 1206 8765 27 C106 150pF 200V D29 ZHCS506 8765 C69 1.5nF 630V 1206 FG 5678 Q8 BSC190N15NS3 Q9 BSC190N15NS3 Q11 OPT R5 OPT 2512 SWB R53 6.8 1206 4 0 R4 8.2K 2512 CLAMP D1 ES1PD GND VIN ND SGND R76 4.22 0805 R49 FG 12 13 14 1 IS+ 1 6 5 23 R9 0 E3 +VOUT L3 3.3uH Q3 OPT SW 3 -VOUT 8.2 1206 7 SW D28 OPT 3 -VIN OPT REGSD 1.21K 0805 D27 ZHCS506 9 10 3 16 1210 R84 2 4 1 E2 32 C5 4.7uF 100V 3 C4 4.7uF 100V 1210 C3 4.7uF 100V 1210 VSEC -VIN C6 4.7uF 100V 1210 SS 33uF 80V D 8.2 1206 R24 C51 470pF 630V 1206 9 C2 4.7uF 100V 1210 + C22 PGND 20 33uF 80V R3 1 2 3 + C1 R23 14 FGD/SWB 36V-60VIN VA R2 OPT RUN E1 T1 LTCP26-0402 8 2 8 1 L2 2.0uH 5 6 7 8 +VIN T3 CT02-100 VIN 3 2512 2 1.0uH OPT 2512 1 D L1 R1 0.33 R110 1.20 1206 1/2W ITH- SGND C11 15nF R151 100 SGNDP A NOTE: 4.7uF 100V MURATA, GRM32ER72A475KE14 (X7R 1210) 4.7uF 25V AVX, 12063C475KAT2A (X7R 1206) 22uF 16V MURATA, GRM32ER71C226MEA8L (1210 X5R) 2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812) 150uF 16V PANASONIC, 16TQC150MYF 33uF 80V PANASONIC, EEHZA1K330P (10x12.5mm) L2 Vishay IHLP4040DZER2R0M11 L3 Coilcraft SER2915L-332KL Unless otherwise specified: 0.005 ohm Susumu KRL6432D-M-R005-F-T5 (1225) All resistors are in ohms 0603. R110 SUSUMU, RL1632S-1R20-F (1206) All capacitors are in microfarads 0603. T1 Champs, LTC-PQ26-0402 All capacitors are 25V. T2 Pulse, PA3493NL CUSTOMER NOTICE 1/16W = 0402, 1/10W = 0603, 1/8W = 0805, 1/4W = 1206, 1W = 2512. 5 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 2 TECHNOLOGY LT DAVID B. TITLE: SCHEMATIC SIZE N/A SCALE = NONE 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 DC2199A Wednesday, October 29, 2014 SHEET 1 1 REV. 2 OF 2 A 5 4 3 2 1 OPTIONAL CIRCUITS D D J1 FG R11 1.00K R13 6.8 2512 RSQ1 7 2 5 C16 56pF 1 6 4 3 ZXGD3002E6 R14 6.8 2512 R15 6.8 2512 CLAMP D2 OPT R25 1 OPT PSS PSS 2 R34 3 OPT 4 5 C15 0.1uF 0805 6 Q4 FQD4P25 2 C14 0.1uF R17 100K 1206 SGNDP R19 1.5K R26 OPT SGND SSS SSS 7 R35 OPT 8 ITH R27 OPT VS+ R28 OPT 1 16 VDD B1 VSS2 VSS 1 Q1 C20 0.1uF VCC 15 4 A1 CRX 8 2 C13 10pF RES R12 4.99K 3 47pF 5 SO16 U3 HEF4528BT SGNDP C17 15nF 200V 1206 ACTIVE SNUBBER VSS1 C12 SW ITH RSITHC ITH- R30 OPT VS- R31 OPT VS- VS+ 9 10 11 PTSYNC PT- R32 OPT SYNC R33 OPT 12 13 14 1 2 3 4 5 6 7 8 9 10 C 11 12 13 14 OPT HD2X7-MOLEX VCCP 2 AG AG C18 OPT PGNDP 5 PGNDP 1 6 4 +VOUT OPT 2 AG1 AG1 VA C21 OPT 0805 D4 1 VA D37 1 3 OPT OPT D38 OPT OPT 3 PEAK CHARGE VCC L4 VAUX VPK VA 2 C116 OPT 1206 D35 OPT 1 OPT 0805 C114 OPT 0805 PGND PGNDP A PGND CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 B R152 1 B VCC FROM T1 SW C19 Q2 OPT 3 AC DRIVER 4 3 2 TECHNOLOGY LT DAVID B. TITLE: SCHEMATIC SIZE N/A SCALE = NONE 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 DC2199A Wednesday, October 29, 2014 SHEET 2 1 REV. 2 OF 2 A