PTMP6331QDECTQ1 datasheet(14/21 Pages) TI1

tên linh kiện	PTMP6331QDECTQ1

Giải thích chi tiết về linh kiện	TMP63-Q1 100-k廓 Linear Thermistor With Small, 0402 Package Option

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Temperature (qC)

100

125

150

D014

OUT

TEMP

R EF

TMP63

TEMP

BIAS

TMP63

u ¨

RBias

200 k

5 V

RTMP63

200 k

VOut

10 k

200 k

VTemp

RFB

300 k

VRef

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 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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