5 4 3 2 1 D D E1 +VIN 10V-15.5V VIN J1 C11 C1 10µF 50V + R1 1.00M 1% R2 R3 1.00M 1% R4 E2 -VIN VIN 4 143k 1% R5 86.6k 1% C 5 R6 9 (Opt) UVLO OVLO/DC ILIM/SS C3 0.1µF R7 R8 1 7 RT SWB 6 2 49.9k 1% 4 C4 180pF 0805 U1 LT3999EMSE 1MHz 12.1k 1% 13.3k 1% R9 SWA 10 R10 39 0805 C5 4.7µF 25V 1206 5 3 2 6 7 1 8 C7 10uF 50V 1206 C6 (Opt) 1206 T1 750314781 Wurth Elektronik D1 C8 (Opt) 1206 D2 D4 1 2 IN IN 3 SHDN 4 PWRGD 6 D3 CMSH1-200HE C12 U2 LT3065EDD L1 39µH Coilcraft XFL3012-393MEC 3 (Opt) ADJ 7 C10 10µF 25V 1206 R15 (Opt) 1206 E5 8 C GND IMAX GND GND 5 E4 VOUT1 +12V 200mA 9 10 R13 1.00M 1% REF/BYP C9 0.01µF 50V R12 10k 1210 OUT OUT 0.1µF 25V R14 52.3k 1% 11 RDC RBIAS SYNC GND 8 11 U3 LT3090EDD L2 39µH Coilcraft XFL3012-393MEC C13 (Opt) 1206 E3 C14 10uF 50V 1206 C15 (Opt) 1206 1 2 IN 11 IN IN OUT OUT E6 VOUT2 -12V 200mA 9 10 3 R11 0Ω 6 C17 2200pF 1KV 1206 4 5 C16 10µF 25V 1206 E7 R16 10k 1206 SYNC B 12V Noise Monitor 1µF 25V C2 4.7uF 25V 0805 ILIM SET SHDN 7 IMONP IMONN GND B GND R17 243k 1% 8 NOTE: UNLESS OTHERWISE SPECIFIED. 1. ALL RESISTORS 0603. CUSTOMER NOTICE 2. ALL CAPACITORS 0603. 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. A APPROVALS TECHNOLOGY PCB DES. TITLE: SCHEMATIC APP ENG. Low Noise Isolated Power Supply C:\PADS PROJECTS\2049A(LT3999MS10)\SCH\2049A_REV3.DSN 5 4 3 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 IC NO. N/A SCALE = NONE 2 MODIFY DATE: REV. LT3999EMSE DC2049A Nov 13, 2014 3 SHEET 1 1 OF 1