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TC642B - PWM Fan Speed Controllers

General Description

The TC642B/TC647B devices are new versions of the existing TC642/TC647 fan speed controllers.

These devices are switch mode, fan speed controllers that incorporate a new fan auto-restart function.

Temperature-proportional speed control is accomplished using pulse width modulation.

Key Features

  • Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life.
  • Efficient PWM Fan Drive.
  • 3.0V to 5.5V Supply Range: - Fan Voltage Independent of TC642B/TC647B Supply Voltage - Supports any Fan Voltage.
  • FanSense™ Fault Detection Circuit Protects Against Fan Failure and Aids System Testing.
  • Shutdown Mode for "Green" Systems.
  • Supports Low Cost NTC/PTC Thermistors.
  • Over-Temperature Indication (TC642B only).

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Other Datasheets by Microchip Technology

Part Number Description
TC642 PWM Fan Speed Controller
TC643 INTEGRATED FAN / MOTOR DRIVER
TC646 PWM Fan Speed Controller
TC647 PWM Fan Speed Controller
TC647B PWM Fan Speed Controllers

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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M TC642B/TC647B PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense™ Technology for Fault Detection Features • Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life • Efficient PWM Fan Drive • 3.0V to 5.