TC642B

更新时间： 2024-11-06 04:00:31

品牌	Logo	应用领域
美国微芯 - MICROCHIP		风扇控制器
页数	文件大小	规格书
34页	663K
描述
PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection

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TC642B 数据手册

TC642B/TC647B

PWM Fan Speed Controllers With Minimum Fan Speed,

Fan Restart and FanSense™ Technology for Fault Detection

Features

Description

• Temperature-Proportional Fan Speed for Acoustic

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. Tempera-

ture-proportional speed control is accomplished using

pulse width modulation. A thermistor (or other voltage

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

output temperature sensor) connected to the V input

- Supports any Fan Voltage

supplies the required control voltage of 1.20V to 2.60V

(typical) for 0% to 100% PWM duty cycle. Minimum fan

• FanSense^™Fault Detection Circuit Protects

Against Fan Failure and Aids System Testing

speed is set by a simple resistor divider on the V

MIN

input. An integrated Start-Up Timer ensures reliable

motor start-up at turn-on, coming out of shutdown

mode or following a transient fault. A logic-low applied

• Shutdown Mode for "Green" Systems

• Supports Low Cost NTC/PTC Thermistors

• Over-Temperature Indication (TC642B only)

• Fan Auto-Restart

to V

(pin 3) causes fan shutdown.

MIN

The TC642B and TC647B also feature Microchip

• Space-Saving 8-Pin MSOP Package

™

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 TC642B/

Applications

• Personal Computers & Servers

• LCD Projectors

• Datacom & Telecom Equipment

• Fan Trays

TC647B device to turn the V

output on full (100%

OUT

duty cycle). If the fault persists (a fan current pulse is

not detected within a 32/f period), the FAULT output

• File Servers

• General Purpose Fan Speed Control

goes low. Even with the FAULT output low, the V

OUT

output is on full during the fan fault condition in order to

attempt to restart the fan. FAULT is also asserted if the

PWM reaches 100% duty cycle (TC642B only), indicat-

ing that maximum cooling capability has been reached

and a possible overheating condition exists.

Package Types

MSOP, PDIP, SOIC

The TC642B and TC647B devices are available in 8-pin

plastic MSOP, SOIC and PDIP packages. The specified

temperature range of these devices is -40 to +85ºC.

OUT

TC642B

TC647B

FAULT

MIN

GND

SENSE

 2003 Microchip Technology Inc.

DS21756B-page 1

12 3 4 5 6 7...34

中文翻译

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与TC642B相关器件

型号	品牌	获取价格	描述	数据表
TC642B_13	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642BEOA	MICROCHIP	获取价格	暂无描述
TC642BEOA713	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642BEOATR	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642BEPA713	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642BEPATR	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642BEUA	MICROCHIP	获取价格	BRUSHLESS DC MOTOR CONTROLLER, PDSO8, PLASTIC, MSOP-8
TC642BEUA713	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642BEUATR	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
TC642COA	MICROCHIP	获取价格	PWM Fan Speed Controller with FanSense⑩ Techn

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