TC649
PWM Fan Speed Controller with Auto-Shutdown
and FanSenseв„ў Technology
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 FanSenseв„ў 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 Applications Power Supplies
Computers
File Servers
Portable Computers
Telecom Equipment
UPSs, Power Amps
General Purpose Fan Speed Control Available Tools Fan Controller Demonstration Board (TC642DEMO) Fan Controller Evaluation Kit (TC642EV) Package Types
SOIC/PDIP/MSOP
VIN 1 CF 2 VAS
GND 8 VDD 7 VOUT 3 6 FAULT 4 5 SENSE TC649 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 …