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 modulation (PWM).

Features

• Temperature Proportional Fan Speed for Acoustic

Control and Longer Fan Life

• Efficient PWM Fan Drive

• 3.0V to 5.5V Supply Range:

- Fan Voltage Independent of TC642

Supply Voltage

- Supports any Fan Voltage

• FanSense™ Fault Detection Circuits Protect

Against Fan Failure and Aid System Testing

• Shutdown Mode for Green Systems

• Supports Low Cost NTC/PTC Thermistors

• Space Saving 8-Pin MSOP Package

• Over-temperature Indication

Applications

• Power Supplies

• Personal Computers

• File Servers

• Telecom Equipment

• UPSs, Power Amps, etc.

• General Purpose Fan Speed Control

Available Tools

• Fan Controller Demonstration Board (TC642DEMO)

• Fan Controller Evaluation Kit (TC642EV)