TMP20_15 Datasheet, PDF (9/19 Pages) Texas Instruments – ±2.5°C Low-Power, Analog Out TEMPERATURE SENSOR

TMP20
www.ti.com
SBOS466 – DECEMBER 2009
R5 100k
Vref
RG1 100k
C3 2.5u R7 31.6k _{R6 100M} C2 15.9n
R3 1M
U1 OPA333
-
++
VoA333
R2 100k
Vset VCC
17
3 19
4
VoA1
_
5
+
6
V-
Iset _{Imon I LimFlg 14}
U2 OPA569
En
Out
T Flg
+V
12
8
7
+_A
Isource
VCC
RTflag1 10k
VTEMP
VCC
4
V+
TEMP(C)
VOUT TMP20 T
GND GND
5
2
VCC
Cold Plate
3
Tobject (C)
T1 TEC1
Hot Plate ¹
TEC, Heat Sink, Object,
and TMP20 Mounting
RG3 100k
RF3 100k
VoA2
A₊
Isink
4
19 3
17
V- _
14 I LimFlg ^{Imon Iset}
Out
U3 OPA569
T Flg
En
7
8
+V ⁺
12
5
Vref
6
RTflag2 10k
VCC
VTEMP
Vset
Vref
VCC
+
V2 1.4
V
V1 2.5
5
VM3
Cold Plate
Hot Plate
+
V
VM1
+
V
VM2
(1) The TMP20 TINA model is preliminary only.
(2) Parameters and definitions:
a. T_object = Temperature of object to be cooled (in °C)
b. V_set = Voltage that corresponds to desired output temperature from TMP20
c. V_temp = Voltage output of 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 is capable of cooling to –7°C and heating to +41°C; the V_set range is 1.38V to
1.95V. The OPA569 device outputs = ±1.65A, ±0.5V to ±4.5V. The 10MΩ 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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Product Folder Link(s): TMP20
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