TMP300 datasheet(7/14 Pages) TI

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ANALOG TEMPERATURE OUTPUT

USING A DAC TO SET THE TRIP POINT

210kW

SET

OUT

V+

HYST

SET

TEMP

TMP300

3 A

Proportional

toT

AnalogOut

OPA335

1.00

0.75

0.50

0.25

0.50

0.75

1.00

100

125

Temperature( C)

210kW

SET

OUT

V+

HYST

SET

TEMP

TMP300

3 A

Proportional

toT

Open-DrainControl

Voltagesource

totesttrippoint.

DAC8560

TMP300

SBOS335A – JUNE 2005 – REVISED SEPTEMBER 2007

The analog out or VTEMP pin is high-impedance

The trip point is easily converted by changing the

(210k

Ω). Avoid loading this pin to prevent degrading

digital-to-analog

converter

(DAC)

code.

This

the analog out value or trip point. Buffer the output of

technique can be useful for control loops where a

this pin when using it for direct thermal measurement.

large thermal mass is being brought up to the set

Figure 9 shows buffering of the analog output signal.

temperature and the OUT pin is used to control the

heating element. The analog output can be monitored

in a control algorithm that adjusts the set temperature

to prevent overshoot. Trip set voltage error versus

temperature is shown in Figure 10, which shows error

°C of the comparator input over temperature. An

alternative method of setting the trip point by using a

DAC is shown in Figure 11.

Figure 9. Buffering the Analog Output Signal

Figure 10. Trip Set Voltage Error vs Temperature

Figure 11. DAC Generates the Voltage-Driving TSET Pin

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