5 4 3 2 1 REVISION HISTORY VCC VCC INPUT TP11 C6 D3 ISNK TP17 C15 3 8 NC 0-> +5V 2 A 3 C14 1uF GND 4 CW INCREASE VR2 10K VCSRC +5V MAX 2 4 6 19 V- SENSE+ SENSE- VCSRC C23 0.1uF 3 VEE -18V MAX E3 C 1/2W * Q2 G * IRF530N TBD 2 6 D5 BAV99 C18 TBD 1 * C13 3 2 TP3 JP4 DC GAIN 1-2 +1 AC GAIN +2 2-3 -1, +1 -1, +1 3-4 -1, +1 -1, +1 4-5 +2 +2 R11 * FET_V- JP4 SETTING DIAGRAM FET_V- 1-2 TP7 R30 100 IN JP2 3 * R12 TBD INV NON TBD * R15 OUTPUT * TP8 TBD R1K_LOAD 1K (OPT.) RF 10K 1 10K 10K OUTPUT J4 GND J6 3-4 IN JP2 2 B + 10uF DUAL SINGLE SUPPLY 10K 4-5 INV NON JP2 + INV NON 10K C2 DUAL SUPPLY ONLY IN + J2 (OPT.) OUTPUT MONITOR BNC JP6 DUAL SINGLE SUPPLY JP2 INV NON 10K R_SENSE * R14 2-3 IN - * TP4 10K DUAL SINGLE SUPPLY + R13 VEE_DEVICE 3 + E2 D VEE DUAL SINGLE C22 10uF 35V C21 0.1uF GND TP9 C24 1 100K VCSRC/VCLCONT R2 + NFET JP5 S C 10K C20 10uF 35V C11 0.1uF S B R1 + D VCC OUT FET D 220pF R28 100K VCSNK C10 10uF 35V C9 0.1uF JP4 SETTINGS 1 NC 2 C5 0.1uF 11-28-12 1/2W 2 +5V CW INCREASE 1 C4 10uF 35V VCSNK 1 VR1 10K 5 R8 *100 R29 + 1uF SENSE VCSNK VEE_DEVICE IN 7 1 10 11 20 VEE_DEVICE 12 R16 2K -IN DATE TIM R. + VCC +18V MAX E1 * Q1 R9 3 OPA OUT 13 8 V- D V+ TSD VCC COMMON VEE VEE VEE VEE VCC NC 16 17 18 7 ENABLE U1 LT1970A 4 14 ISRC VEE V-18V MAX E5 VEE FILTER 25V R26 10K 6 S TP5 5 C VEE * OPA OUT +IN D4 BAT54WS C17 10uF JP7 OUTPUT SUPPLIES R10 TBD TP2 JP4 1 2 3 4 5 3 R21 C12 TBD V- IRF9530N PFET +IN 9 OUT B G 15 3 R27 4.99K R20 4.99K SHDN * TBD TP15 ISRC TP16 2 DUAL U2 LTC3010EMS8E-5 R3 SEP 2 D1 * A 5 3 1 * TP14 ISNK SINGLE C16 10uF 35V TP10 TSD JP3 APPROVED C8 10uF 35V GND E6 V+ VCC R5 R6 R7 1.5K 1.5K 1.5K ENABLE IN INV R19 TP6 * R23 TBD COM NON 2 D2 JP2 R18 4.99K 2.5K FET_V+ * R22 TBD R4 10K AC 1 DC VCC TSD AMB ISNK AMB ISRC RED 3 JP1 V+ +18V MAX E4 FET_V+ 2 1 BNC B DESCRIPTION PRODUCTION V+ 0.1uF 10uF 35V INPUT_OPA TP1 J1 (OPT.) INPUT + 1 1 10uF C1 25V R17 4.99K REV __ + GND TP12 D C7 ECO TP13 10K 10K 10K TBD CUSTOMER NOTICE * VERSION TABLE A TP18 TP19 TP20 TP21 TP22 Assembly Type R9, R10, R11 R8 R12,R14 Q1, Q2 R_SENSE C12, C13 R13,R15 R3, R21 R22, R23 GND DC453B-A NON BOOSTED DC453B-B BOOSTED 0 JUMPER 100 NOT NOT NOT INSTALLED INSTALLED INSTALLED NOT INSTALLED INSTALLED INSTALLED 1 OHM >=0.5W NOT 0 JUMPER INSTALLED NOT INSTALLED 0.1 OHM >=3W INSTALLED 0 JUMPER NOT INSTALLED 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. 4 3 PCB DES. AK APP ENG. TIM R. TECHNOLOGY POWER OP AMP WITH ADJUSTABLE CURRENT LIMIT N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 APPROVALS DATE: IC NO. REV. LT1970A DEMO CIRCUIT 453B Wednesday, November 28, 2012 1 SHEET 1 1 OF 1 A