550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 1
TEC-4A
Analog Technologies, Inc.
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.: 0.002°C/°C
Target temp. offset: ±0.01°C
Target temp. response time: to ≤0.1°C in less than 5 seconds at 1°C step
Efficiency: ≥90%
Max. output current: 4A
Max. output voltage: externally adjustable from 0V to Vps − 0.2V
Power supply voltage: 3.1V to 3.5V or 4.75V to 5.25V
(specify 3.3V or 5V when ordering)
Set-point temp.** control voltage: 0 to Vps
Packaging: through hole
Shielding: complete metal shielding on all 6 sides
Default set-point temp. range***: 15°C to 37°C @Vps = 3.3V
15°C to 50°C @Vps = 5V
Operating ambient temp. range: -25°C to 85°C
* 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.
t
Figure 1 TEC Controller Block Diagram
Set-point Temp.
TEC
++
−−
Thermistor
Temp. Good Indication
12
Temperature
Measurement
Circuit
Thermal
Load
Compensation
Network
12
High Efficiency
H Bridge
Drive
12
Temperature
Monitor
Circuit Temp. Output
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 2
TEC-4A
Analog Technologies, Inc.
RTH
D/A
t
Figure 2 TEC Controller Connections
A/D
TEMPSP
VPS
PGND
4.75V to 5.25V
GND
VTECCMIN
TECNEG
TECPOS
TEC
+
−
GND
Thermistor
TEC Controller
TEMP
16
15
3
5
8
7 6
10
11
13
12
CdRd
RpCi
23V
Ri
PGND
14
TECCRT
Voltage Ref.
9SDNG
From Microprocessor
4GND
3.1V to 3.3V
or
R
R
TEMPGD
1
To Microprocessor
Compensation network
(Provided by internal components)
3M
0.33uF 1M 3M 0.22uF
m
m
R = 10K @ 25 Cth o
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 0.1°C 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 25°C. When Vps = 5V, it can be set from 0V to 5V and the set-point temperature
changes from 15°C to 50°C (See the curve in the back). The input impedance is 10KΩ. When Vps =
3.3V, the max. TEMPSP can be set to 3.3V, corresponding to 37°C. This pin can be set by using a D/A, a
POT, or a single resister. When the set-point temp. is fixed at 25°C, 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.
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 3
TEC-4A
Analog Technologies, Inc.
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 15°C to 37°C when
Vps is 3.3V and 15°C to 50°C 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 = 10KΩ @ 25°C. 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.
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 4
TEC-4A
Analog Technologies, Inc.
Figure 3 Top View of TEC-4A
VTEC
3V
TEMPSP
TEMP
CMIN
TECCRT
TEMPGD
GND
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
GND
RTH
TECNEG
TECPOS
PGND
VPS
PGND
SDNG
27mm
21.5mm
11mm
0.42mm
Figure 4 End View of TEC-4A
18mm
3mm
11mm
0.6mm
Figure 5 Side View of TEC-4A
2.54mm
3mm
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 5
TEC-4A
Analog Technologies, Inc.
Ordering Guide
Part Number Description Note
TEC-4A-5V-XX 5V power supply in DIP package. Max. TEC voltage can be
selected from 4.8V, 4V, 3.5V,
3V, 2.5V and 2V or required
one
TEC-4A-3V-XX 3.3V power supply in DIP package. Max. TEC voltage can be
selected from 2.5V and 2V or
required one
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 6
TEC-4A
Analog Technologies, Inc.
Rth v.s. Temperature
0
5
10
15
20
25
30
510 15 20 25 30 35 40 45 50 55 60
Temperature (C)
Rth (K Ohm)
TEMPSP v.s. Temperature
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
15 20 25 30 35 40 45 50
Temperature (C)
TEMPSP (V)
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 7
TEC-4A
Analog Technologies, Inc.
V Rth v.s. Temperature
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
15 20 25 30 35 40 45 50
Temperature (C)
V Rth (V)
I Rth v.s. Temperature
54
59
64
69
74
79
84
89
94
99
104
109
114
15 20 25 30 35 40 45 50
Temperature (C)
I Rth (uA)
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com
Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. 8
TEC-4A
Analog Technologies, Inc.
Linearity Error in TEMPSP v.s. Temperature
-0.015
0
0.015
0.03
0.045
0.06
0.075
0.09
0.105
0.12
0.135
0.15
0.165
0.18
0.195
0.21
0.225
0.24
0.255
15 20 25 30 35 40 45 50
Temperature (C)
Linearity Error
in TEMPSP (V)
P Rth v.s. Temperature
46
46.5
47
47.5
48
48.5
49
49.5
50
50.5
51
51.5
52
52.5
53
53.5
54
15 20 25 30 35 40 45 50
Temperature (C)
P Rth (uW)
