Temperature (qC)

0

25

50

75

100

125

150

0

1

2

3

4

5

6

D014

94 k

5 V

200 k

10 k

200 k

300 k

13

TMP64

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SNIS212 – DECEMBER 2019

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Typical Application (continued)

Figure 11. Thermal Foldback Using TMP64 Voltage Divider and a Rail-to-Rail Op Amp

then the output swings low to the 0-V rail of the op amp. The rate at which the foldback occurs is dependent on

controls the voltage/temperature sensitivity of the circuit. This voltage output is fed into a LED driver IC that

Equation 7. In this example where the knee point is set at 110 °C, the output voltage curve is as shown in

Figure 12.

(5)

(6)

(7)

Figure 12. Thermal Foldback Voltage Output Curve