QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 491 TEC TEMPERATURE CONTROLLER LTC1923EUH DESCRIPTION set point stability typically well within 0.05C over widely varying ambient temperature. Temperature set point is established with a potentiometer. Considerably more detail relating to TEC temperature control issues is available in LTC Application Note AN-89, A Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers. This publication should be reviewed before demo board results are evaluated. Demonstration circuit 491 features the LTC1923EUH thermoelectric cooler (TEC) controller. The LTC1923EUH comes in a small 32-lead QFN package (5mm by 5mm). Since the switching frequency of the circuit is 1MHz, small size inductors and capacitors are used as output filters. The main components are within a small assembly area about 0.75" by 0.5". DC491 provides a complete temperature control solution for TEC based temperature control of fiber-optic lasers. Laser temperature may be controlled at temperatures above or below ambient with Design files for this circuit board are available. Call the LTC factory. QUICK START PROCEDURE Demonstration circuit 491 is easy to set up to evaluate the performance of the LTC1923EUH. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 3. Adjust the temperature set point potentiometer (R15) using a small screwdriver. 4. Connect the TEC leads from the laser to the boards TEC+ and TEC- terminals. Observe polarity. 1. Connect a turned-off power supply (2.7-5.5V) to the 5. Turn on the power supply. The board will typically pull VDD and GND terminals. hundreds of milliamps for several seconds. Once the temperature set point is reached the current drops and settles to some sustaining value. 2. Connect a thermistor to the NTC+ and NTC- termi- nals. Although the thermistor is not a polarized device, one of its leads may be committed to the lasers case ground. If this is so, this lead should be connected to NTC-. Shielded cable should be used for the thermistor leads, with the shield connected to ground. - 6. Performance optimization for any particular laser is achievable by following the procedures and guidelines given in LTC Application Note AN-89. + + + - - LASER THERMISTOR + + - - TEC Figure 1. Proper Measurement Equipment Setup 1 5 4 3 2 1 TEC SUPPLY R1 C1 56 VSET R6 9.09K 1% C9 0.1uF SM Film R9 R7 10M 1% 100K 1% R10 TP4 NTC+ 1K 1% TP5 NTC- C17 0.1uF C C13 1uF C10 4.7uF 6.3V R12 R13 10K 1% 47.5K 1% 32 SDSYNCB VREF 27 1 CNTRL PDRVB 24 2 EAOUT NDRVB 23 3 FB 4 AGND 6 SS 7 ILIM VSET 8 VSET 9 FAULTB C18 0.1uF VSET 10 VTHRM 11 H/C 12 VTEC 26 N/C 25 N/C R14 10K 0.1% TP6 VTEC B PGND 20 NDRVA 19 PDRVA 18 CS+ 17 CS- 16 ITEC 15 TEC+ 14 TEC- 13 C5 4 VDDF VDD VDD 1uF TP1 0.1uF C12 2.2 1uF R11 0.1uF TECTEC L1 Q2-1 Si5904DC 2 C7 TP2 TEC+ Q1-2 Si5915DC VDD R8 C6 L2 4.2uH C14 10uF 6.3V 4.2uH C15 10uF 6.3V C16 Q1-1 Si5915DC Q2-2 Si5904DC 10uF 6.3V 0.02 0.25W 1% C8 10uF 6.3V 2 4 C N/C 5 TP7 ITEC GND CW 2 FAULT R17 C19 0.1uF SM Film 200 D1 VDDF LED(Red) 3 VDDF R16 10K 0.1% VDD 22 VDD 21 VSET TP8 3 1 R15 20K TEMP. ADJ. RT 29 CT 28 1 0 SHDN/SYNC 30 PLLPF 31 RSLEW 8 7 - R24 6 5 2 VDDF 3 + TP3 D 330pF 3 3 U2 LTC2053CMS8 7 + 841 C3 U1 LTC1923EUH 5 6 R4 2.2K R5 10K 1% C11 0.1uF SM Film RT1 OPEN R25 10K 7 8 0.1uF 0.1uF R3 10K 0.1% 0.1uF R2 VDDF 1 C2 C4 D 2.2K VDDF VSET VDDF R18 100K Q3 VDD 1 2 Q4 2N7002 Heat R20 200 D2 GND TP10 LED(Grn) Q5 2N7002 R22 VDDF 100K 1 R23 100K 2 3 200 VDDF D3 3 R21 C20 22uF 10V 1 LED(Orn) Cool VDDF VDD 2.7-5.5V 2 VDDF B TP9 R19 100K 3 2N7002 Q6 2N7002 A CONTRACT NO. 1 APPROVALS 2 DRAWN DATE June Wu 1/10/02 Wei Chen 1/10/02 TECHNOLOGY CHECKED ENGINEER LTC1923EUH, TEC Temperature Controller DESIGNER Friday, April 05, 2002 4 A TITLE APPROVED 5 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 3 2 SIZE CAGE CODE DWG NO REV DC491A SCALE: FILENAME: SHEET 1 A 1 OF 1 Bill Of Material Demo Bd. # 491A Linear Technology Corporation LTC1923EUH 6/17/2005 Item Qty Reference 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 7 1 3 4 3 1 1 1 1 1 2 1 1 4 2 1 0 3 2 1 1 1 5 1 1 1 1 3 1 10 1 1 4 4 1 C1,C2,C4,C6,C7,C17,C18 C3 C5,C12,C13 C8,C14,C15,C16 C9,C11,C19 C10 C20 D1 D2 D3 L1,L2 Q1 Q2 Q3,Q4,Q5,Q6 R1,R4 R25 R2(not install) R3,R14,R16 R5,R12 R6 R7 R8 R9,R18,R19,R22,R23 R10 R11 R13 R15 R17,R20,R21 R24 TP1-TP10 U1 U2 Part Description CAP., X5R, 0.1uF, 10V, 20% 0402 CAP., X7R, 330pF, 50V, 20% 0402 CAP., X5R, 1uF, 6.3V, 20% 0603 CAP., X5R, 10uF, 6.3V, 20% 1206 CAP., SM Film, 0.1uF, 16V, 20% 0805 CAP., Tant., 15uF, 10V, 20% 3216 CAP., Tant., 22uF, 10V, 20% 3528 LED(Red) LED(Orn) LED(Grn) INDUCTOR, 4.2uH CDRH5D28 Dual P-MOSFET, Si5915DC 1206-8 Dual N-MOSFET, Si5904DC 1206-8 N-MOSFET, 2N7002 RES., CHIP, 2.2K, 1/16W, 5% 0402 RES., CHIP, 10K, 1/16W, 5% 0402 RES., 0402 RES., CHIP, 10K, 0.1W, 0.1% 0805 RES., CHIP, 10K, 1/16W, 1% 0402 RES., CHIP, 9.09K, 1/16W, 1% 0402 RES., CHIP, 10M, 1/16W, 1% 0402 RES., CHIP, 2.2, 1/16W, 5% 0402 RES., CHIP, 100K, 1/16W, 1% 0402 RES., CHIP, 1K, 1/16W, 1% 0402 RES., CHIP, 0.02, 0.25W, 1% 1206 RES., CHIP, 47.5K, 1/16W, 1% 0402 Pot. 11 Turns 20K RES., CHIP, 200, 1/16W, 5% 0402 RES., CHIP, 0, 1/16W, 5% 0402 TURRET, I.C., LTC1923EUH, MLP-32 I.C., LTC2053, MS8 SCREW, #4-40, 1/4" STANDOFF, NYLON HEX #4-40 1/4" PRINTED CIRCUIT BOARD Page 1 - of - 1 Manufacture / Part # TAIYO YUDEN, LMK105BJ104MV AVX, 04025C331MAT TAIYO YUDEN, JMK107BJ105MA TAIYO YUDEN, JMK316BJ106ML Panasonic, ECP-U1C104MA5 AVX, TAJA156M010R AVX, TPSB226M010R Panasonic, LN1251-C-TR Panasonic, LN1851-C-TR Panasonic, LN1351-C-TR SUMIDA, CDRH5D28-4R2 VISHAY, SI5915DC VISHAY, SI5904DC Diodes Inc., 2N7002-7 AAC, CR05-222JM AAC, CR05-103JM KOA, RN73T2A1002B AAC, CR05-1002FM AAC, CR05-9091FM AAC, CR05-1005FM AAC, CR05-2R2JM AAC, CR05-1003FM AAC, CR05-1001FM IRC, LRF1206-01-R020-F AAC, CR05-4752FM Bourns, 3224W-1-203E AAC, CR05-201JM AAC, CR05-000JM MILL-MAX, 2501-2 LINEAR., LTC1923EUH LINEAR., LTC2053CMS8 ANY MICRO PLASTICS 14HTSP101 DEMO CIRCUIT 491A