Vset

VTEMP

Vset

VCC

VCC

Hot Plate

Cold Plate

Vref

VCC

VTEMP

Vref

Vref

VCC

VCC

Cold Plate

Hot Plate

VCC

Tobject (C)

C3 2.5u

R7 31.6k

R6 100M

C2 15.9n

R3 1M

VoA333

R2 100k

V

+

VM3

+

-

+

U1 OPA333

1

3

T1 TEC1

GND

T

GND

VOUT

V+

2

4

5

TMP20

Iset

3

I LimFlg

4

5

_

6

+

7

T Flg

8

En

12

+V

14

Out

17

V-

19

Imon

U3 OPA569

V2 1.4

TEMP(C)

R5 100k

V1 2.5

RTflag2 10k

Iset

3

I LimFlg

4

5

_

6

+

7

T Flg

8

En

12

+V

14

Out

17

V-

19

Imon

U2 OPA569

RTflag1 10k

V

+

VM2

V

+

VM1

A

+

Isink

VoA2

RF3 100k

RG3 100k

A

+

Isource

VoA1

5

RG1 100k

TEC, Heat Sink, Object,

and TMP20 Mounting

Copyright © 2017, Texas Instruments Incorporated

15

TMP20

www.ti.com

SBOS466B – DECEMBER 2009 – REVISED DECEMBER 2018

Product Folder Links: TMP20

Submit Documentation Feedback

Copyright © 2009–2018, Texas Instruments Incorporated

Device Support (continued)

(1)

The TMP20 TINA model is preliminary only.

(2)

Parameters and definitions:

a.

Tobject = Temperature of the object to be cooled (in °C)

b.

Vset = Voltage that corresponds to the desired output temperature from the TMP20

c.

VTEMP = Voltage output of the TMP20

d.

Hotplate = TEC plate on opposite side of object

e.

Coldplate = TEC plate in contact with object

(3)

In this configuration, the TEC driver can cool to –T°C and heating to 41°C; the Vset range is 1.38 V to 1.95 V. The

OPA569 device outputs = ±1.65 A, ±0.5 V to ±4.5 V. The 10-MΩ resistors are for TINA convergence.

(4)

For convergence in TINA software: In Analysis/Set Analysis Parameters menu, set shunt conductance = 1 p.

Figure 16. Thermoelectric Cooler

To download a compressed file that contains the TINA-TI simulation file for this circuit, see Thermoelectric

Cooler.