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Features

鈥?Temperature Proportional Fan Speed for Acoustic

Control and Longer Fan Life

鈥?Efficient PWM Fan Drive

鈥?3.0V to 5.5V Supply Range:

- Fan Voltage Independent of TC647

Supply Voltage

- Supports any Fan Voltage

鈥?FanSense鈩?Technology Fault Detection Circuits

Protect Against Fan Failure and Aid System

Testing

鈥?Shutdown Mode for "Green" Systems

鈥?Supports Low Cost NTC/PTC Thermistors

鈥?Space Saving 8-Pin MSOP Package

TC647

Package Types

SOIC/PDIP/MSOP

V

IN

C

F

V

MIN

GND

1

2

3

4

8

V

DD

V

OUT

FAULT

SENSE

PWM Fan Speed Controller with FanSense

鈩?/div>

Technology

TC647

7

6

5

General Description

The TC647 is a switch mode, fan speed controller for

use with brushless DC fans. Temperature proportional

speed control is accomplished using pulse width mod-

ulation (PWM). A thermistor (or other voltage output

temperature sensor) connected to V

IN

furnishes the

required control voltage of 1.25V to 2.65V (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.

The TC647 also features Microchip Technology's pro-

prietary FanSense鈩?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 TC647 to trigger its

Start-up Timer once. If the fault persists, the FAULT

output goes low and the device is latched in its shut-

down mode.

The TC647 is available in the 8-pin plastic DIP, SOIC

and MSOP packages and is available in the industrial

and extended commercial temperature ranges.

Applications

鈥?/div>

Power Supplies

Personal Computers

File Servers

Telecom Equipment

UPSs, Power Amps

General Purpose Fan Speed Control

Available Tools

鈥?Fan Controller Demonstration Board (TC642DEMO)

鈥?Fan Controller Evaluation Kit (TC642EV)

錚?/div>

2002 Microchip Technology Inc.

DS21447C-page 1

標(biāo)準(zhǔn)包裝
100
類(lèi)別
集成電路 (IC)
家庭
PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器
系列
-
應(yīng)用
風(fēng)扇控制器，無(wú)刷（BLDC）
評(píng)估套件
-
輸出數(shù)
1
電流 - 輸出
-
電壓 - 負(fù)載
-
電源電壓
3 V ~ 5.5 V
工作溫度
0°C ~ 85°C
安裝類(lèi)型
表面貼裝
封裝/外殼
8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝
8-MSOP
包裝
管件

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