The TC649B is a new version of the existing TC649 fan speed controller. This device is a switch mode fan speed controller, which incorporates 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 speed is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode, or following a transient fault. A logic low applied to VIN, pin 1, causes fan shutdown.
The TC649B also features Microchip Technology's proprietary FanSense™ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, pin 5. A missing-pulse detector monitors this pin during fan operation. A stalled, open, or unconnected fan causes the TC649B device to turn the VOUT output on full (100% duty cycle). If the fan fault persists (a fan current pulse is not detected within a 32/F period), the FAULT output goes low. Even with the FAULT output low, the VOUT output is on full during the fan fault condition in order to try and restart the fan.
Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
FanSense™ Protects Against Fan Failure
Efficient PWM Drive
Automatic Shutdown Mode for "Green" Systems
3.0V to 5.5V Supply Range
Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
Supports Low Cost NTC/PTC Thermistors
Fan Auto-Restart
TC649B 封装图
TC649B 封装图
TC649B 封装图
TC649B 封装图
TC649B电路图
TC649B 引脚图
型号 | 制造商 | 描述 | 购买 |
---|---|---|---|
TC649BEUATR | - | - | 立即购买 |
TC649BEUA | ON | SWITCHING CONTROLLER, CURRENT-MO | 立即购买 |
TC649BEOATR | Linear | ICREGCTRLRFWRDCONV38TSSOP | 立即购买 |
TC649BEPA | Torex | ICWATCHDOGTIMER6-USP | 立即购买 |
TC649BEOA | Torex | IC SUPERVISOR 1 CHANNEL 6USPC | 立即购买 |
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