5 3 +Vin T1 +Vout CTX-02-15242 C Q2 MMBTA42 8.5V R3 8.06K 1 2 5 6 1 Ith/RUN NGATE 6 2 GND 5 3 Vfb C03 100uF 6.3V Vcc SENSE GND E5 C12 150pF 200V Q1 FDC2512 3 11 4 D3 BAS516 U1 LTC3803ES6 470pF(opt.) 82K (opt.) C C02 100uF 6.3V Ith E4 R4 C01 100uF 6.3V R20 100K E B PDZ-9.1B 9.1V C4 D R1 220K D2 C11 22pF (opt.) 9 2 1uF 100V R21 220 4 E3 +Vout 5V@2A 10 Cin1 E2 UPS840 -Vin SHDN 1 D1 E1 36V-72V D 2 12 +Vin 4 Rs1 4 C 4.7K Rcs 0.068 C1 1uF 10V +Vout R6 42K (opt.) 8.5V D4 BAS516 Ith R8 470K B NOTE : To convert to non isolated design, remove the opto coupler and LT1431 circuit. Place a short across C10 and install R6. Also, add C4 and R3. R22 6.8K R19 C2 U3 8 47nF 1 7 6 2 5 3 4 100 C3 10V R2 4.75K 4.7nF R18 C5 1 C Ref 8 2 COMP Rmid 7 3 V+ GND-F 6 4 Rtop GND-S 5 U2 LT1431CS8 CONTRACT NO. APPROVALS DATE June Wu 2/11/03 Goran Perica 2/11/03 CHECKED TECHNOLOGY 5 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A TITLE LTC3803ES6, Telecom DC/DC Converter APPROVED ENGINEER R5 10K 1uF C10 2200pF 250V DRAWN B 10K MOCC207 A R7 220 DESIGNER SIZE CAGE CODE Monday, August 25, 2003 SCALE: 2 FILENAME: DWG NO REV A DC649A SHEET 1 1 OF 1