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Features

鈥?Temperature Proportional Fan Speed for Acoustic

Control and Longer Fan Life

鈥?Efficient PWM Fan Drive

鈥?3.0V to 5.5V Supply Range:

- Fan Voltage Independent of TC642

Supply Voltage

- Supports any Fan Voltage

鈥?FanSense鈩?Fault Detection Circuits Protect

Against Fan Failure and Aid System Testing

鈥?Shutdown Mode for "Green" Systems

鈥?Supports Low Cost NTC/PTC Thermistors

鈥?Space Saving 8-Pin MSOP Package

鈥?Over-temperature Indication

TC642

Package Types

SOIC/PDIP/MSOP

V

IN

CF

V

MIN

GND

1

2

3

4

8

V

DD

V

OUT

FAULT

SENSE

PWM Fan Speed Controller with FanSense

鈩?/div>

Technology

TC642

7

6

5

General Description

The TC642 is a switch mode fan speed controller for

use with brushless DC fans. Temperature proportional

speed control is accomplished using pulse width mod-

ulation (PWM). A thermistor (or other voltage output

temperature sensor) connected to the V

IN

input fur-

nishes the required control voltage of 1.25V to 2.65V

(typical) for 0% to 100% PWM duty cycle. Minimum fan

speed is set by a simple resistor divider on the V

MIN

input. An integrated Start-up Timer ensures reliable

motor start-up at turn-on, coming out of shutdown

mode or following a transient fault. A logic low applied

to V

MIN

(Pin 3) causes fan shutdown.

The TC642 also features Microchip Technology's pro-

prietary FanSense鈩?technology for increasing system

reliability. In normal fan operation, a pulse train is

present at SENSE (Pin 5). A missing pulse detector

monitors this pin during fan operation. A stalled, open

or unconnected fan causes the TC642 to trigger its

Start-up Timer once. If the fault persists, the FAULT

output goes low and the device is latched in its shut-

down mode. FAULT is also asserted if the PWM

reaches 100% duty cycle, indicating a possible thermal

runaway situation, although the fan continues to run.

See Section 5.0, 鈥淭ypical Applications鈥? for more

information and system design guidelines.

The TC642 is available in the standard 8-pin plastic

DIP, SOIC and MSOP packages and is available in the

commercial, extended commercial and industrial

temperature ranges.

Applications

鈥?/div>

Power Supplies

Personal Computers

File Servers

Telecom Equipment

UPSs, Power Amps, etc.

General Purpose Fan Speed Control

Available Tools

鈥?Fan Controller Demonstration Board (TC642DEMO)

鈥?Fan Controller Evaluation Kit (TC642EV)

錚?/div>

2002 Microchip Technology Inc.

DS21444C-page 1

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