Datasheet > TC642B_13

TC642B_13

更新时间： 2024-11-05 12:01:55

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
36页	563K
描述
PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSenseâ¢ Technology for Fault Detection

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TC642B_13 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

Noise Reduction and Longer Fan Life

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

output temperature sensor) connected to the V_INinput

supplies the required control voltage of 1.20V to 2.60V

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

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

to V_MIN(pin 3) causes fan shutdown.

• 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

The TC642B and TC647B also feature 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 TC642B/

TC647B device to turn the V_OUToutput on full (100%

duty cycle). If the 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 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.

• 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

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.

V_IN

C_F

V_DD

V_OUT

TC642B

TC647B

V_MIN

GND

FAULT

SENSE

 2002-2013 Microchip Technology Inc.

DS21756C-page 1

12 3 4 5 6 7...36

中文翻译

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TC642BEUA713	MICROCHIP	获取价格	PWM Fan Speed Controllers With Minimum Fan Sp
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TC642COA	MICROCHIP	获取价格	PWM Fan Speed Controller with FanSense⑩ Techn
TC642COA713	MICROCHIP	获取价格	PWM Fan Speed Controller with FanSenseâ¢ Tec

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