器件名称: TC648BEOA713
功能描述: PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense
文件大小: 683.71KB 共36页
简 介:M TC646B/TC648B/TC649B
PWM Fan Speed Controllers With Auto-Shutdown, 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 5.5V Supply Range: - Fan Voltage Independent of TC646B/ TC648B/TC649B Supply Voltage - Supports any Fan Voltage FanSense Fault Detection Circuit Protects Against Fan Failure and Aids System Testing (TC646B/TC649B) Automatic Shutdown Mode for “Green” Systems Supports Low Cost NTC/PTC Thermistors Over-Temperature Indication (TC646B/TC648B) Fan Auto-Restart Space-Saving 8-Pin MSOP Package
Description
The TC646B/TC648B/TC649B devices are new versions of the existing TC646/TC648/TC649 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. 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 threshold/temperature is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor startup at turn-on, coming out of shutdown mode, autoshutdown mode or following a transient fault. A logic low applied to VIN (pin 1) causes fan shutdown. The TC646B and TC649B also feature Microchip Technology's ……
