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General Description

The TC646 is a switch mode, fan speed controller for use with brushless DC fans. Temperature proportional speed control is accomplished using pulse width modulation (PWM). A thermistor (or other voltage output temperature sensor) connected to the VIN input furnishes the required control voltage of 1.25V to 2.65V (typical) for 0 to 100 PWM duty cycle. The TC646

automatically suspends fan operation when measured temperature (VIN) is below a user programmed minimum setting (VAS). An integrated Start-up Timer ensures reliable motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode or following a transient fault.

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 TC646 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

? Computers

? File Servers

? Portable Computers

? Telecom Equipment

? UPS, Power Amps

? General Purpose Fan Speed Control