1 2 3 4 5 6 7 8 A A On 1 R1 274K 1% JP1 R6 0 2 R5 133K 1% 3 Off U1 1 R2 0 RUN SENSE 2 ITH VIN 9 3 FB INTVCC 8 4 FREQ GATE 7 5 MODE/SYNC GND 6 Q1 SI4840DY R7 Opt. E3 1 3 5 6 7 8 Opt. L1-2 4.56uH BH510-1009 4 R4 110K 1% RT 80.6K 1% 1 + COUT1 47uF COUT2 16V COUT3 X5R COUT4 10uF 16V X7R GND 4 LTC1871EMS10 R8 0 2512 CVCC 4.7uF JP2 3 B E4 + R3 12.4K 1% 2 CC2 6800pF VOUT 12V/2A 1 2 3 RC 33.2K 1% D1 UPS840 2 CC1 GND E2 CDC 10uF 25V X5R 10 + CIN4 100uF 20V TPS 3 B L1-1 4.56uH BH510-1009 VIN 5V-15V CIN1 10uF CIN2 25V CIN3 X5R 2 1 E1 C C Cont. Burst 10V X5R LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA 95035 PHONE (408) 432-1900 FAX (408) 434-0507 D Title Size D High Efficiency SEPIC Converter Document Number DC415A LTC1871EMS10 Date: Wednesday, November 28, 2001 1 2 3 4 5 6 Sheet 7 of 1 8 Rev 1