1 L1 11 VIN 0 A R5 APD IN 2 49.9 C4 0.1uF 100V 10 GND GND RT 9 7 R13 (OPT) SYNC 16 MON J1 1 13 VREF MON C8 (OPT) R3 18.7K FB 15 14 CTRL R7 OPT R2 1M N/C 1 E3 R6 C3 10nF 100V MON IN 3 12 SHDN C9 0.22uF 3 CTRL U1 LT3571EUD 2 SHDN A 20 17 GND JP1 OUTPUT RUN SW 5 SW 6 E2 1 GND C1 0.1uF 100V 2 3 4 5 R4 20K C2 1uF 16V R1 10uH COPPER BUSSMANN SD3110-100-R VOUT 4 VIN E1 8 VIN 5V - 12V 2 R8 12.1K APD 50V @ 2mA E4 GND E7 SYNC FAST MON RESPONSE CIRCUIT E6 Q1 ZXTN25100DFH R9 100K VIN R10 U2 B R12 4.99K 1 OUT C7 1uF LOAD STEP CIRCUIT 3 E10 +IN 3 V- MON R11 4.99K 2 OUT PWM C6 0.1uF B 2 C5 0.5pF -IN 4 V+ 5 U3 LT1815CS5 E9 IN 1 LT1460KCS3-2.5 100 GND MON 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 CONTRACT NO. APPROVALS DRAWN DATE HELEN 4/08/08 ENGINEER Jesus.R 4/08/08 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TITLE CHECKED LT3571EUD, DC/DC Boost Converter for APD Bias APPROVED DESIGNER Monday, March 02, 2009 SIZE CAGE CODE SCALE: DWG NO FILENAME: 2 REV A DC1423A SHEET 1 OF 1