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

200 k

5 V

200 k

10 k

200 k

300 k

14

TMP63-Q1

SNIS215 – JANUARY 2020

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Typical Application (continued)

Figure 19. Thermal Foldback Using Voltage Divider and a Rail-to-Rail Op Amp

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

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

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