TC648B

更新时间： 2025-08-31 04:00:31

品牌	Logo	应用领域
美国微芯 - MICROCHIP		风扇风机控制器
页数	文件大小	规格书
36页	684K
描述
PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection

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TC648B 数据手册

M _{TC646B/TC648B/TC649B}

PWM Fan Speed Controllers With Auto-Shutdown, Fan

Restart and FanSense™ Technology for Fault Detection

Features

Description

• Temperature-Proportional Fan Speed for Acoustic

The TC646B/TC648B/TC649B devices are new ver-

sions of the existing TC646/TC648/TC649 fan speed

controllers. These devices are switch-mode fan speed

controllers that incorporate a new fan auto-restart func-

tion. Temperature-proportional speed control is accom-

plished using pulse width modulation. A thermistor (or

other voltage output temperature sensor) connected to

Noise Reduction and Longer Fan Life

• Efficient PWM Fan Drive

• 3.0V to 5.5V Supply Range:

- Fan Voltage Independent of TC646B/

TC648B/TC649B Supply Voltage

- Supports any Fan Voltage

the V input supplies the required control voltage of

• FanSense^™Fault Detection Circuit Protects

Against Fan Failure and Aids System Testing

(TC646B/TC649B)

1.20V to 2.60V (typical) for 0% to 100% PWM duty

cycle. The auto-shutdown threshold/temperature is set

by a simple resistor divider on the V input. An inte-

grated 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

• Automatic Shutdown Mode for “Green” Systems

• Supports Low Cost NTC/PTC Thermistors

• Over-Temperature Indication (TC646B/TC648B)

• Fan Auto-Restart

low applied to V (pin 1) causes fan shutdown.

The TC646B and TC649B 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 TC646B/

• Space-Saving 8-Pin MSOP Package

Applications

• Personal Computers & Servers

• LCD Projectors

• Datacom & Telecom Equipment

• Fan Trays

TC649B device to turn the V

output on full (100%

OUT

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

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

• File Servers

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 (TC646B) or OTF

(TC648B) is also asserted if the PWM reaches 100%

duty cycle, indicating that maximum cooling capability

has been reached and a possible overheating condition

exists.

• General-Purpose Fan Speed Control

Package Types

MSOP, PDIP, SOIC

The TC646B, TC648B and TC649B devices are avail-

able in 8-pin plastic MSOP, SOIC and PDIP packages.

The specified temperature range of these devices is

-40 to +85ºC.

OUT

TC646B

TC649B

FAULT

GND

SENSE

OUT

TC648B

OTF

GND

 2003 Microchip Technology Inc.

DS21755B-page 1

12 3 4 5 6 7...36

中文翻译

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