DEMO MANUAL DC2902A DESCRIPTION LTM4663 Ultrathin 1.5A Thermoelectric Cooler (TEC) Module Regulator Demonstration circuit 2902A is a thermoelectric cooler (TEC) regulator featuring the LTM(R)4663 Module regulator. The demo board has a 2.7V to 5.5V input voltage range and can deliver up to 1.5A of sinking or sourcing current. Inside the LTM4663, a linear power stage works together with a PWM power stage to form an H-bridge configuration. The direction of the current fed through the TEC can be either positive (for cooling mode), or negative (for heating mode). The LTM4663 has two built-in zero drift, rail-to-rail chopper amplifiers which can serve as a thermistor input amplifier and form an analog temperature control loop. The LTM4663 provides a 1% accuracy 2.5V internal reference voltage to bias the thermistor temperature sensing circuit and to program the maximum TEC current and voltage limits for both the cooling and heating modes. The demo board has a default 2MHz switching frequency and can be synchronized to an external clock from 1.85MHz to 3.25MHz applied to the EN/SY input pin (JP1: EN/SY). The clock high level must be above 2.1V and the clock low level must be below 0.8V. Maximum TEC current limit can be programmed with a resistor, R7 (default: 1.5A for cooling mode; -1.5A for heating mode). Maximum TEC voltage limit can be programmed with a resistor, R10 (default: 5V for cooling mode; -4.8V for heating mode). Other features include VTEC output for TEC voltage monitor and ITEC output for TEC current monitor. The LTM4663 datasheet gives a complete description of the operation and application information. The datasheet must be read in conjunction with this demo manual. Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at TA = 25C PARAMETER CONDITIONS VALUE Input Voltage Range Maximum TEC Current Cooling mode 2.7V to 5.5V 1.5A Maximum TEC Current Typical Switching Frequency Typical Efficiency Typical Efficiency Heating mode Cooling mode, VIN = 5V, ITEC = 1.5A, 2 load Heating mode, VIN = 5V, ITEC = -1.5A, 2 load -1.5A 2MHz 88.6% 89.1% BOARD PHOTO Rev. 0 1 DEMO MANUAL DC2902A QUICK START PROCEDURE Demonstration circuit 2902A is easy to set up to evaluate the performance of the LTM4663. Refer to Figure1 for the proper measurement setup and follow the procedure below: the changes of value and direction of the voltage across the TEC+ and TEC- terminals, and the current through the load. (Positive TEC voltage: cooling mode; negative TEC voltage: heating mode). 1.With power off, connect the input power supply to VIN(2.7V-5.5V) and GND (input return). 6.Adjust the VIN within the operating range (2.7V-5.5V) and repeat step 5. Observe the voltage across the TEC+ and TEC- terminals, and the current through the load, efficiency, maximum TEC current limits, maximum TEC voltage limits and other features. 2.Many users do not have a real TEC, or do not want to use a real TEC for initial tests. In these cases, you may use a proper power resistor as a load to test the operation of the LTM4663, by connecting the resistor to TEC+ and TEC- terminals. Set jumper JP1 to "on" position, and jumper JP2 to "POT" position. 3.Connect the DVMs to the input and outputs. 4.Turn on the input power supply (VIN = 3.3V recommended) and check for the voltage across the TEC+ and TEC- terminals, and the current through the load. 5.Use a small screwdriver to adjust the potentiometer (R18). check for the voltage across the TEC+ and TEC- terminals, and the current through the load. Observe Notes: a.To test the LTM4663 with a suitable TEC, connect the TEC to TEC+ and TEC- terminals. Observe TEC polarity. b.For real TEC thermal system, connect a thermistor (NTC) between the Thermistor terminal and ground terminal. Set jumper JP2 to "NTC". c. When using a power resistor as a load for testing, make sure it has high enough power rating. Recommend a power resistor with 10W rating. Proper cooling may be needed for the power resistor. Figure1. Proper Measurement Setup Rev. 0 2 DEMO MANUAL DC2902A QUICK START PROCEDURE 100 80 80 70 70 60 50 40 60 50 40 30 30 20 20 10 10 0 0 VIN = 3.3V VIN = 5V 90 EFFICIENCY (%) EFFICIENCY (%) 100 VIN = 3.3V VIN = 5V 90 0.5 1.0 TEC CURRENT (A) 0 1.5 Figure2. Efficiency vs TEC current (Cooling mode, 2 load) EN 2V/DIV TEC CURRENT 1A/DIV TEC CURRENT 1A/DIV 50ms/DIV Figure4. Typical Enable waveforms (Cooling mode, VIN = 3.3V, 2 load, TEC current = 1.4A) -0.5 -1.0 TEC CURRENT (A) -1.5 Figure3. Efficiency vs TEC current (Heating mode, 2 load) EN 2V/DIV TEC+ 2V/DIV TEC- 2V/DIV 0 TEC- 2V/DIV TEC+ 2V/DIV 50ms/DIV Figure5. Typical Enable waveforms (Heating mode, VIN = 3.3V, 2 load, TEC current = -1.2A) Rev. 0 3 DEMO MANUAL DC2902A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 3 C1, C7, C12 CAP., 10uF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J106KE47D 2 1 C5 CAP., 1uF, X5R, 6.3V, 10%, 0603 MURATA, GRM188R60J105KA01D 3 1 C8 CAP., 0.1uF, X7R, 6.3V, 10%, 0603 KEMET, C0603C104K9RAC7867 4 1 C10 CAP., 0.01uF, X5R, 50V, 10%, 0603 MURATA, GRM188R61H103KA01D 5 1 C14 CAP., 1.5uF, X7R, 10V, 10%, 0603 TDK, C1608X7R1A155K080AC 6 1 R1 RES., 15k OHMS, 1%, 1/10W, 0603 YAGEO, RC0603FR-0715KL 7 1 R7 RES., 49.9k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4992V 8 3 R11, R16, R29 RES., 0 OHM, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA 9 2 R13, R15 RES., 10k OHMS, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER, RK73H1JTTD1002F 10 1 R17 RES., 100k OHMS, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1003TRF 11 1 R18 RES., 20K OHMS, 10%, 1/4W, SMD 4.8x3.9mm, 12 TURN, TOP ADJUST, TRIMPOT BOURNS, 3224W-1-203E 12 2 R25, R28 RES., 1.87M OHMS, 1%, 1/10W, 0603 VISHAY, CRCW06031M87FKEA 13 1 R27 RES., 165k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603165KFKEA 14 1 U1 IC, 1.5A TEC MODULE REGULATOR, LGA ANALOG DEVICES, LTM4663EV#PBF Additional Demo Board Circuit Components 15 0 R10 RES., OPTION, 0603 Hardware: For Demo Board Only 16 10 E1, E2, E3, E10, E11, E14, E16, E17, E18, E19 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0 17 2 J1, J2 CONN., BANANA JACK, FEMALE, THT, NONINSULATED, SWAGE, 0.218" KEYSTONE, 575-4 18 1 JP1 CONN., HDR., MALE, 2x3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121 19 1 JP2 CONN., HDR., MALE, 1x3, 2mm, VERT, STR, THT SULLINS CONNECTOR SOLUTIONS, NRPN031PAEN-RC 20 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2902A 21 2 STENCILS (TOP & BOTTOM) STENCIL DC2902A 22 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833 23 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421 Rev. 0 4 A B C D JP2 E18 E11 J2 J1 E10 E1 1 2 3 15k 3 6 4 2 JP1 R18 20k VIN 1 0 R16 EN/SY C1 10uF 6.3V 5 3 1 EN/SY OFF ON C8 0.1uF 6.3V Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 5 1. ALL RESISTORS AND CAPACITORS ARE 0603. NOTE: UNLESS OTHERWISE SPECIFIED POT NTC THERMISTOR GND GND 2.7V - 5.5V VIN VIN EN/SY R1 R13 10k TAMPOUT 100k R17 4 10k R15 VIN 4 0 R11 SVIN TFB TSET VREF SVIN C12 10uF TAMPOUT C4 E5 E1 E2 PVIN PVIN R10 A3 B3 49.9k OPT R7 R25 E3 165k R27 1.87M C10 0.01uF 1.5uF C14 U1 R28 1.87M LTM4663-EV 3 3 SW 1 SVIN 2 C2 VTEC D2 EN/SY A2 SW B2 SW C3 ITEC E4 VLIM/SD TAMPOUT C5 ILIM PAMPN D4 PAMPOUT D3 5 GNDP GNDL GNDL NC GNDA SFB VPWM VLDR VLDR A1 A5 B5 D5 D1 C1 B1 B4 A4 0 R29 C7 10uF 6.3V 2 THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS. ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE. CUSTOMER NOTICE C5 1uF 6.3V 2 LT CZ APP ENG. APPROVALS PCB DES. GND GND TEC- TEC+ ITEC VTEC SIZE: www.analog.com 1 SHEET 1 OF 710-DC2902A_REV02 SCHEMATIC NO. AND REVISION: DATE: Friday, November 15, 2019 IC NO. LTM4663EV SKU NO. DC2902A N/A TM DATE 1 11-15-19 2555 AUGUSTINE DRIVE SANTA CLARA, CA 95054 CZ ULTRA TINY 1.5A TEC uMODULE REGULATOR TITLE: SCHEMATIC AHEAD OF WHAT'S POSSIBLE E19 E17 E16 E14 E3 E2 PRODUCTION 1 REVISION HISTORY DESCRIPTION APPROVED ANALOG DEVICES 2 ECO REV A B C D DEMO MANUAL DC2902A SCHEMATIC DIAGRAM Rev. 0 5 DEMO MANUAL DC2902A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. 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