Microchip Technology TC647B
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.| Part No. | TC647B |
|---|---|
| Datasheet | TC647B Download |
| Manufacturer |  Microchip Technology |
| Description | PWM Fan Speed Controllers |
| Buy | Stock & Price |
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)
● Fan Auto-Restart
● Space-Saving 8-Pin MSOP Package
APPLICATIONS
● Personal Computers & Servers● LCD Projectors
● Datacom & Telecom Equipment
● Fan Trays
● File Servers
● General Purpose Fan Speed Control Package Types MSOP, PDIP, SOIC VIN CF VMIN GND 1 2 3 4 TC642B TC647B 8 VDD 7 VOUT 6 FAULT 5 SENSE
DESCRIPTION
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.
