TMP20 datasheet(9/18 Pages) TI1

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Vset

VTEMP

Vset

VCC

HotPlate

ColdPlate

Vref

VCC

VTEMP

Vref

VCC

ColdPlate

HotPlate

VCC

Tobject(C)

C32.5u

R731.6k

R6100M

C215.9n

R31M

VoA333

R2100k

VM3

U1OPA333

T1 TEC1

GND

VOUT

V+

TMP20

Iset

ILimFlg

T Flg

Out

V-

Imon

U3OPA569

V21.4

TEMP(C)

R5100k

V12.5

RTflag210k

Iset

ILimFlg

T Flg

Out

V-

Imon

U2OPA569

RTflag110k

VM2

VM1

Isink

VoA2

RF3100k

RG3100k

Isource

VoA1

RG1100k

TEC,HeatSink,Object,

andTMP20Mounting

TMP20

www.ti.com

SBOS466 – DECEMBER 2009

(1)

The TMP20 TINA model is preliminary only.

(2)

Parameters and definitions:

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

Vset = Voltage that corresponds to desired output temperature from TMP20

Vtemp = Voltage output of TMP20

Hotplate = TEC plate on opposite side of object

Coldplate = TEC plate in contact with object

(3)

In this configuration, the TEC driver is capable of cooling to –7°C and heating to +41°C; the Vset range is 1.38V to

1.95V. The OPA569 device outputs = ±1.65A, ±0.5V to ±4.5V. The 10M

Ω resistors are for TINA convergence.

(4)

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

Figure 13. Thermoelectric Cooler

To download a compressed file that contains the TINA-TI simulation file for this circuit, click the following link:

Thermoelectric Cooler.

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