5 4 3 2 1 REVISION HISTORY ECO REV - 1 APPROVED DESCRIPTION PRODUCTION DATE Keith S. 04/14/10 D D E3 25 JP1 34 INTVCC 28 C10 4.7uF 10V 0603 8 NC NC C8 0.01uF 0402 6 VOUT 48V @ 500mA E7 R5 464k 1% 0402 C12 (Opt) 0402 C R7 15.8k 1% 0402 1 2 10 35 36 B GND GND GND C7 2.2uF 100V 1210 31 C9 0.33uF 0603 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 TECHNOLOGY RB Keith S. C:\ORCADWIN\CAPTURE\1569A\1569A_REV1.DSN 5 C6 2.2uF 100V 1210 12 13 14 32 SS R3 10k 0402 24 C13 (Opt) 0402 GND B GND NC VC 15 30 C5 2.2uF 100V 1210 SW 9 SW 20 SW 21 SW RT GND 41.2k 1% 0402 16 300kHz NC 33 C11 (Opt) 0402 LT3958EUHE NC R4 SGND U1 INTVCC SGND E9 FBX 17 E2 SGND SYNC SGND E1 INTVCC 38 SENSE1 SYNC C4 2.2uF 100V 1210 3 R8 0 Ohm 0402 37 E5 3 C3 2.2uF 100V 1210 GND C14 (Opt) 0402 R2 53.6k 1% 0402 2 NO SYNC C 1 SENSE2 SGND SYNC SYNC E6 3 2 EN/UVLO 4 E8 EN/UVLO 23 E10 GND SW R1 392k 1% 0402 27 GND 1 D1 PDS360 Sumida C2 2.2uF 100V 1210 C1 2.2uF 100V 1210 VIN E4 SGND VIN 11V - 40V L1 33uH CDRH127/LDNP-330MC SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY A TITLE: SCHEMATIC HIGH VOLTAGE BOOST, FLYBACK, SEPIC, AND INVERTING CONVERTER SIZE IC NO. LT3958EUHE N/A DEMO CIRCUIT 1569A Thursday, June 10, 2010 DATE: 2 SHEET 1 1 REV. 1 OF 1