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TMP63 Arkusz danych(PDF) 15 Page - Texas Instruments

Numer części TMP63
Szczegółowy opis  TMP63 짹1% 100-k廓 Linear Thermistor With 0402 and 0603 Package Options
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TMP63 Arkusz danych(HTML) 15 Page - Texas Instruments

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Temperature (qC)
0
25
50
75
100
125
150
0
1
2
3
4
5
6
D014
OUT
TEMP
R EF
V
G
V
1
G
V
u
u
FB
1
R
G
R
TMP63
TEMP
BIAS
BIAS
TMP63
R
V
V
R
R
§
·
u ¨
¸
©
¹
RBias
200 k
5 V
RTMP63
R2
200 k
VOut
R1
10 k
R3
200 k
VTemp
RFB
300 k
VRef
15
TMP63
www.ti.com
SNIS211C – OCTOBER 2019 – REVISED JUNE 2020
Product Folder Links: TMP63
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Copyright © 2019–2020, Texas Instruments Incorporated
Typical Application (continued)
Figure 19. Thermal Foldback Using Voltage Divider and a Rail-to-Rail Op Amp
The op amp remains high as long as the voltage output is below VREF. When the temperature goes above 110°C,
the output falls to the 0-V rail of the op amp. The rate at which the foldback occurs depends on the feedback
network, RFB and R1, which varies the gain of the op amp, G, as shown in Equation 6. The foldback behavior
controls the voltage and temperature sensitivity of the circuit. The device feeds this voltage output into a LED
driver circuit that adjusts output current accordingly. VOUT is the final output voltage used for thermal foldback
and is calculated in Equation 7. Figure 20 describes the output voltage curve in this example which sets the knee
point at 110°C.
(5)
(6)
(7)
Figure 20. Thermal Foldback Voltage Output Curve


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