Datasheet > TC646B_13

TC646B_13

更新时间： 2024-09-16 12:27:19

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	580K
描述
PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSenseâ¢ Technology for Fault Detection

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TC646B_13 数据手册

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

Noise Reduction and Longer Fan Life

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

the V_INinput supplies the required control voltage of

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_ASinput. 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

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

• Efficient PWM Fan Drive

• 3.0V to 5.5V Supply Range:

- Fan Voltage Independent of TC646B/

TC648B/TC649B Supply Voltage

- Supports any Fan Voltage

• FanSense^™Fault Detection Circuit Protects

Against Fan Failure and Aids System Testing

(TC646B/TC649B)

• Automatic Shutdown Mode for “Green” Systems

• Supports Low Cost NTC/PTC Thermistors

• Over-Temperature Indication (TC646B/TC648B)

• Fan Auto-Restart

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/

TC649B device to turn the V_OUToutput 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 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.

• 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 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.

V_IN

C_F

V_DD

V_OUT

TC646B

TC649B

V_AS

GND

FAULT

SENSE

V_IN

V_DD

V_OUT

OTF

C_F

V_AS

TC648B

GND

 2002-2013 Microchip Technology Inc.

DS21755C-page 1

12 3 4 5 6 7...36

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