器件名称:
TC649VUA
功能描述:
PWM Fan Speed Controller with Auto-Shutdown and FanSense
文件大小:
478.53KB 共28页
简 介:
M 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 TC649 Supply Voltage - Supports any Fan Voltage FanSense Fault Detection Circuits Protect Against Fan Failure and Aid System Testing Automatic Shutdown Mode for “Green” Systems Supports Low Cost NTC/PTC Thermistors Space Saving 8-Pin MSOP Package TC649 Package Types SOIC/PDIP/MSOP VIN CF VAS GND 1 2 3 4 8 VDD VOUT FAULT SENSE PWM Fan Speed Controller with Auto-Shutdown and FanSense Technology TC649 7 6 5 General Description The TC649 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 TC649 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. In normal fan operation, a pulse train is present at SENSE (Pin 5). The TC649 features Microchip Technology’s proprietary FanSenseTM technology for increasing system reliability. A missing pulse detector monitors this pin during fan operation. A stalled, o……
