Temperature (qC)

0

25

50

75

100

125

150

0

1

2

3

4

5

6

D014

OUT

TEMP

REF

V

G

V

1

G

V

u

u

FB

1

R

G

R

TMP64

TEMP

BIAS

BIAS

TMP64

R

V

V

R

R

§

·

u ¨

¸

©

¹

94 k

5 V

200 k

10 k

200 k

300 k

15

TMP64

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SNIS212B – DECEMBER 2019 – REVISED JUNE 2020

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Typical Application (continued)

Figure 16. 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 17.

(5)

(6)

(7)

Figure 17. Thermal Foldback Voltage Output Curve