200 k

5 V

200 k

10 k

200 k

300 k

Figure 8-9. Thermal Foldback Using Voltage Divider and a Rail-to-Rail Op Amp

110°C, the output falls to the 0-V rail of the op amp. The rate at which the foldback occurs depends on the

behavior controls the voltage and temperature sensitivity of the circuit. The device feeds this voltage output into

foldback and is calculated in Equation 7. Figure 8-10 describes the output voltage curve in this example which

sets the knee point at 110°C.

TMP63

TEMP

BIAS

BIAS

TMP63

R

V

V

R

R

§

·

u ¨

¸

©

¹

(5)

FB

1

R

G

R

(6)

OUT

TEMP

R EF

V

G

V

1

G

V

u

u

(7)

Temperature (qC)

0

25

50

75

100

125

150

0

1

2

3

4

5

6

D014

Figure 8-10. Thermal Foldback Voltage Output Curve

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TMP63-Q1

SNIS215C – JANUARY 2020 – REVISED SEPTEMBER 2020

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