TMP303ADRLR datasheet(14/22 Pages) TI1

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TMP303

HYSTSET0

HYSTSET1

SOH

GND

OUT

OUTPUT

1.4 V to 3.6 V

0.1 F

12 V

TMP303

SBOS486G – JULY 2009 – REVISED JULY 2017

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Typical Applications (continued)

9.2.3 Simple Fan Controller

The circuit in Figure 17 senses system temperature and turns a cooling fan on when the sensor's temperature

exceeds a preselected value. The TMP303 device can be used directly to control the fan. The OUT pin is active

high, and it can be used directly to drive the DC fan. When temperature is within the temperature limits of the

system, the fan turns off, and when the temperature exceeds the trip-point, the fan turns on. In this example, the

TMP303A device is used and is configured with a 1°C hysteresis window (HYSTSET0 = HYSTSET1 = GND). The

TMP303A high trip-point is 60°C. When this trip-point temperature is exceeded, the output (OUT) changes state

from low to high. The output does not return to its low state until the temperature decreases below

(TH – hysteresis) = 59°C.

Figure 17. Simple Fan Controller

TMP303ADRLR Datasheet(PDF) 14 Page - Texas Instruments