TC646VUA

TC646 风扇控制器Microchip TC646 是开关模式风扇速度控制器，设计为可与无刷直流风扇一起使用。 TC646 从外部电热调节器（或其他电压输出传感器）经由 PWM 提供温度比例风扇速度控制。 具有用户可编程的最低温度设置。 这可允许对 TC646 进行自定义，风扇下方的最低温度阈值将关闭。 集成启动计时器，用于可靠电动机启动。 该设备还可利用 Microchip FanSense™ 技术来监控风扇性能。 如果检测到风扇可靠性问题，则 TC646 将通过故障引脚触发警报。### 特点温度比例风扇速度，适用于声学控制和延长风扇寿命 高效 PWM 风扇驱动器 3.0V 至 5.5V 电源范围：- 风扇电压独立于 TC646 电源电压，支持任何风扇电压 FanSense™ 故障检测电路 关闭模式 支持 NTC/PTC 电热调节器 过温指示 ### 电动机控制器和驱动器，Microchip

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