TC647EOA datasheet(6/28 Pages) MICROCHIP

6 / 28 page

TC647

DS21447C-page 6

 2002 Microchip Technology Inc.

Continuous restart mode is enabled by connecting the

FAULT output to VMIN through a 0.1 µF capacitor, as

shown in Figure 3-1. When so connected, the TC647

automatically attempts to restart the fan whenever a

fault condition occurs. When the FAULT output is

driven low, the VMIN input is momentarily pulled below

VSHDN, initiating a reset and clearing the fault

condition. Normal fan start-up is then attempted as pre-

viously described. The FAULT output may be

connected to external logic (or the interrupt input of a

microcontroller) to shut the TC647 down if multiple fault

pulses are detected at approximately one second

intervals.

FIGURE 3-1:

Fan Fault Output Circuit.

FAULT

SENSE

10 k

Ω

1 k

Ω

GND

From

System

Shutdown

Controller

(Optional)

Note: The parallel combination of R3 and R4 must be >10 kΩ.

+12V

+5V

VDD

VIN

VMIN

VOUT

RBASE

RSENSE

CSENSE

1 µF

TC647

Fan

0.01 µF

0.01µF

1µF

From

Temp

Sensor

+5V

TC647

RESET

Fault

Detected

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