首页产品索引TC649B

    TC649B

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    TC649B PWM fan speed controller with temperature proportional control, thermistor input, fan sense, fault, auto shutdown

     

    产品信息

    The TC649B is a new version of the existing TC649 fan speed controller. This device is a switch mode fan speed controller, which incorporates a new fan auto restart function. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input supplies the required control voltage of 1.20V to 2.60V (typical) for 0% to 100% PWM duty cycle. The auto-shutdown speed is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode, or following a transient fault. A logic low applied to VIN, pin 1, causes fan shutdown.

    The TC649B also features Microchip Technology's proprietary FanSense™ 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 TC649B device to turn the VOUT output on full (100% duty cycle). If the fan fault persists (a fan current pulse is not detected within a 32/F period), the FAULT output goes low. Even with the FAULT output low, the VOUT output is on full during the fan fault condition in order to try and restart the fan.

      

    优势特点

    • Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life

    • FanSense™ Protects Against Fan Failure

    • Efficient PWM Drive

    • Automatic Shutdown Mode for "Green" Systems

    • 3.0V to 5.5V Supply Range

    • Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage

    • Supports Low Cost NTC/PTC Thermistors

    • Fan Auto-Restart


    规格参数

    tc649b规格参数.png

    tc649b规格参数1.png


    电路图、引脚图和封装图

    在线购买

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    应用案例更多案例

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