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| Analog Technologies, Inc. TEC-4A HIGH EFFICIENCY TEC CONTROLLER Main features: high efficiency and high power density, high precision, and zero EMI. Specifications Target* temp. stability v.s. ambient temp.: Target temp. offset: Target temp. response time: Efficiency: Max. output current: Max. output voltage: Power supply voltage: Set-point temp.** control voltage: Packaging: Shielding: Default set-point temp. range***: 0.002C/C 0.01C to 0.1C in less than 5 seconds at 1C step 90% 4A externally adjustable from 0V to Vps - 0.2V 3.1V to 3.5V or 4.75V to 5.25V (specify 3.3V or 5V when ordering) 0 to Vps through hole complete metal shielding on all 6 sides 15C to 37C @Vps = 3.3V 15C to 50C @Vps = 5V Operating ambient temp. range: * -25C to 85C Target temperature refers to the actual cold side temperature of the TEC, on where the target is mounted. ** Set-point temperature is the temperature desired to have on the target. *** Can be customized to any range by requirement. Thermistor t Temperature Measurement Circuit Thermal Load 12 Compensation Network Temperature 12 Monitor Circuit High Efficiency 12 H Bridge Drive + TEC - Set-point Temp. Temp. Good Indication Temp. Output Figure 1 TEC Controller Block Diagram 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 1 Analog Technologies, Inc. 4.75V to 5.25V or 3.1V to 3.3V GND Rm D/A Rm TEC-4A TEC Controller 16 15 14 3 5 4 VPS PGND PGND TEMPSP TECCRT GND 3V TEMPGD SDNG TEMP CMIN 7 TECPOS 12 + TEC 13 - TECNEG Voltage Ref. To Microprocessor From Microprocessor 2 1 9 8 RTH 11 t Thermistor Rth = 10K @ 25 oC GND VTEC 6 Rp 3M Ci 0.22uF 10 A/D Ri 3M Compensation network (Provided by internal components) Cd Rd 1M 0.33uF Figure 2 TEC Controller Connections Pin Descriptions Pin 1, TEMPGD, Temperature good indication. It is pulled high when the set-point temperature and the actual target temperature are less than 0.1C in difference. The internal pull up resistor to Vps is 10K Ohm. The pull down resistance is 250 Ohm @ Vps = 5V and 330 Ohm @ Vps = 3.3V. Pin 2, 3V, reference voltage output, 3V. It can be used for external A/D's and/or D/A's. Maximum output sourcing current 1.5mA and sinking current is 4mA. Vo = 50ppm/C max. Pin 3, TEMPSP, target temperature set-point value. The open circuit voltage is 1.5V, corresponding to a set-point temperature of 25C. When Vps = 5V, it can be set from 0V to 5V and the set-point temperature changes from 15C to 50C (See the curve in the back). The input impedance is 10K. When Vps = 3.3V, the max. TEMPSP can be set to 3.3V, corresponding to 37C. This pin can be set by using a D/A, a POT, or a single resister. When the set-point temp. is fixed at 25C, leave this pin unconnected. Pin 4, GND, signal ground for the A/D, D/A and the thermistor. Pin 5, TECCRT, TEC control voltage input. It can be left unconnected or used to control the TEC voltage directly. Set TECCRT between 0V to Vps, the voltage across TEC will be: TEC voltage = Vps - 2*TECCRT. It can also be used to configure the maximum voltage cross the TEC: Max. TEC voltage = Vps*Rm/(Rm+10K), where Rm is the resistance of the two resistors one between TECCRT to GND and the other between TECCRT to Vps, see Figure 2. 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 2 Analog Technologies, Inc. TEC-4A Pin 6, VTEC, TEC voltage indication. TEC voltage = [max. TEC voltage]*[Vps - 2*VTEC]/Vps. When TECCRT is used to control the TEC voltage directly, measure TECCRT to derive the TEC voltage instead, and use this formula: TEC voltage = Vps - 2*TECCRT. The maximum driving current of pin VTEC is 30mA and the output voltage swing is 0V to Vps. Pin 7, CMIN, compensation input pin for the thermal loop control. Leave it open in production. When prototyping, use this pin with a tuner on the evaluation board (produced by ATI) to tune the compensation network to match the characteristics of the thermal load. Pin 8, TEMP, actual target temperature. It swings from 0V to Vps, corresponds to 15C to 37C when Vps is 3.3V and 15C to 50C when Vps equals 5V, see the curve in the below. Pin 9, SDNG, shut down control. When pulled low, it shuts down the controller. Leave it open or pull it high to activate the controller. This pin is internal pull up by a resister of 100K to Vps. Pin 10, GND, signal ground, internally connected to Pin 4 GND. Can be used for connecting the thermistor. Pin 11, RTH, connect to the thermistor for sensing the target temp. Thermistor's other end connects to the signal ground, pin 4 or pin 10. Rth = 10K @ 25C. Other thermistors or temperature sensors can also be used, Consult with us. Pin 12, TECPOS, connects to TEC positive terminal. Pin 13, TECNEG, connects to TEC negative terminal. Pin 14, PGND, power ground for connecting to the power supply. Pin 15, PGND, power ground for connecting to the power supply, internally connected with pin 14. Pin 16, VPS, positive power supply rail. Two possible values: 3.3V and 5V, depending on the module. Customizations It is often found that some of the default specifications do not meet our users particular need. We offer customizations on these specifications: 1. Maximum TEC voltage. When ordering, the part number will become: TEC-4A-5V-(max. TEC voltage). E.g., TEC-4A-5V-4V. 2. Set-point temperature range. When ordering, specify the lower limit, the upper limit, and the open circuit temperature. The part number will become: TEC-4 A-5V-4V-(lower temp. limit)/(upper temp. limit)/(open circuit temp.), where lower temp. limit is the temperature corresponding to TEMPSP = 0V; upper temp. limit is the corresponding to TEMPSP = 3V; open circuit temp. corresponding to TEMPSP = 1.5V or being left unconnected. E.g., TEC-4A-5V-4V-20/80/60. 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 3 Analog Technologies, Inc. TEC-4A 1 2 3 4 5 6 7 8 TEMPGD 3V TEMPSP GND TECCRT VTEC CMIN TEMP VPS PGND PGND TECNEG TECPOS RTH GND SDNG 16 15 14 13 27mm 12 11 10 9 21.5mm Figure 3 Top View of TEC-4A 11mm 0.42mm 18mm 3mm Figure 4 End View of TEC-4A 11mm 0.6mm 2.54mm 3mm Figure 5 Side View of TEC-4A 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 4 Analog Technologies, Inc. Ordering Guide Part Number TEC-4A-5V-XX Description 5V power supply in DIP package. TEC-4A TEC-4A-3V-XX 3.3V power supply in DIP package. Note Max. TEC voltage can be selected from 4.8V, 4V, 3.5V, 3V, 2.5V and 2V or required one Max. TEC voltage can be selected from 2.5V and 2V or required one 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 5 Analog Technologies, Inc. TEC-4A Rth v.s. Temperature Rth (K Ohm) 30 25 20 15 10 5 0 5 10 15 20 25 30 35 40 Temperature (C) 45 50 55 60 TEMPSP (V) 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 15 20 25 TEMPSP v.s. Temperature 30 35 40 45 50 Temperature (C) 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 6 Analog Technologies, Inc. TEC-4A I Rth (uA) 114 109 104 99 94 89 84 79 74 69 64 59 54 15 20 25 I Rth v.s. Temperature 30 35 40 45 50 Temperature (C) V Rth (V) 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 15 20 25 V Rth v.s. Temperature 30 35 40 45 50 Temperature (C) 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 7 Analog Technologies, Inc. TEC-4A P Rth (uW) 54 53.5 53 52.5 52 51.5 51 50.5 50 49.5 49 48.5 48 47.5 47 46.5 46 15 P Rth v.s. Temperature 20 25 30 35 40 45 50 Temperature (C) Linearity Error in TEMPSP (V) 0.255 0.24 0.225 0.21 0.195 0.18 0.165 0.15 0.135 0.12 0.105 0.09 0.075 0.06 0.045 0.03 0.015 0 -0.015 15 Linearity Error in TEMPSP v.s. Temperature 20 25 30 35 40 45 50 Temperature (C) 5 5 0 E . W e d d e l l D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . T e l . : (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W e b : w w w . a n a l o g t e c h n o l o g i e s . c o m (c) Copyright 2000 - 2003, Analog Technologies, Inc. All Rights Reserved. 8 |
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