4 3 2 This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice: Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customers 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 Applications Engineering for assistance. E1 4 5 R1 1M 0805 JP1 C1 1 3 SHDN BURST MODE 1 C3 R4 R14 470 4 5 VFB 6 VC 7 8 R8 93.1k 1% R9 2.21k 1% D5 1N4148WS C12 0.01µF 3 402k 1% 3 R7 4.99k 1% 1 2 1000pF 10% BURST_EN R6 1M 0603 U1 LT3724EFE 1000pF 100V R3 52.3k 1% VCC 2 12/9/03 Ying Cheng June 18, 2012 08/03/05 B GND 2 SHDN FIXED FREQ. "VIN" 60V to 55V, "D2" to 30BQ060 L1= DO5040H-473MLB (Sch & BoM Only) DATE D. Canny CIN3 2.2µF 100V CIN2 2.2µF 100V RUN JP2 1st PROTOTYPE VIN C6 120pF VIN BOOST NC TG SHDN SW CSS NC BURST_EN VCC VFB PGND VC GND SENSE+ Sgnd E2 GND 1 - SENSE- R2 16 15 0 Ohm 14 C2 0.22µF 10% Q1 Si7852DP VOUT L1 R5 SW 13 12 VCC D1 BAS19 11 10 9 47µH DO5040H-473MLB COILCRAFT C4 0.1µF 10% C5 1µF 10% E3 VOUT 24V @ 3A VOUT 0.025 1% 0.5W + D2 30BQ060 COUT1 330µF 35V COUT2 22µF 25V COUT3 22µF 25V GND E4 GND 17 CIN1 + 68µF 63V B ECO REV VIN VIN 30V - 55V 1 REVISION HISTORY DESCRIPTION APPROVED C7 1500pF R15 47k A NOTES: UNLESS OTHERWISE SPECIFIED OPTIONAL BOOST BIAS CIRCUIT (DO NOT INSTALL) VCC 0 Ohm C10 220pF R11 107k 1% R12 10k R13 12.4k 1% 3 STAND-OFF VCC L2 1 5 SW VIN FB SHDN GND D4 ZHCS400 (Opt) C8 4.7µF,6.3V 0805 4 U2 LT1613CS5 + C11 22µF 35V (Opt) LTC CONFIDENTIAL - For Customer Use Only E5 VBIAS 9V-20V (Opt) UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 CONTRACT NO. APPROVALS THIRD ANGLE PROJECTION 2 12/9/03 CHECKED- - APPROVED- - ENGINEER D. CANNY 12/9/03 June 18, 2012 DO NOT SCALE DRAWING 3 2 DATE DRAWN RB DESIGNER - 4 A 10µH ZHCS400 C9 1µF 16V 2. INSTALL SHUNT ON JP1 PIN 1 AND 2, JP2 PIN 1 AND 2. VOUT D3 R10 1. ALL RESISTORS ARE IN OHMS, 0402; AND ALL CAPACITORS ARE IN MICROFARAD, 0402. - TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TITLE SCH, HIGH VOLTAGE STEP-DOWN CONTROLLER SIZE CAGE CODE SCALE: NONE DWG NO REV DC736A FILENAME: 736A_Rev4.DSN 1 SHEET 5 1 OF 1