The TC646B is a new version of the existing TC646 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 TC646B 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 TC646B 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. The FAULT signal is also asserted if the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible thermal runaway condition exists.
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
Over-Temperature Indication
TC646B 封装图
TC646B 封装图
TC646B 封装图
型号 | 制造商 | 描述 | 购买 |
---|---|---|---|
TC646BEUA713 | TI | IC REG BUCK ADJ 1.5A 16HTSSOP | 立即购买 |
TC646BEUA | Maxim | IC REG BUCK ADJ 1.7A 20TQFN | 立即购买 |
TC646BEOA713 | Maxim | IC REG CTRLR BUCK 28SSOP | 立即购买 |
TC646BEPA | Torex | IC SUPERVISOR 1 CHANNEL 6USPC | 立即购买 |
TC646BEOA | Omron Automation and Safety | L-BRACKT FOR WATER-RESIST E3X-NA | 立即购买 |
它由温度传感及继电控制风扇电机电路、温限指示电路、乐曲发声电路和交流降压整流电路等部分组成。核心器件是TC621温控集成电路。
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本文介绍基于TestPro CV100 实现汽车以太网线束TC2/TC9传输性能现场测试方案。
本文介绍基于TestPro CV100 实现汽车以太网线束TC2/TC9传输性能现场测试方案。
本文介绍基于TestPro CV100 实现汽车以太网线束TC2/TC9传输性能现场测试方案。
本文介绍基于TestPro CV100 实现汽车以太网线束TC2/TC9传输性能现场测试方案。
本文介绍基于TestPro CV100 实现汽车以太网线束TC2/TC9传输性能现场测试方案。
下图(a)是由温度传感器TC07构成的加热器控制电路。该电路适用于需要进行加热控制的场合。在下图(a)中,当TC07检测到的温度低于HSFr[滞回温度,如图2-78(b)所示]时,TC07⑤脚输出
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