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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 TC649

Supply Voltage

- Supports any Fan Voltage

鈥?FanSense鈩?Fault Detection Circuits Protect

Against Fan Failure and Aid System Testing

鈥?Automatic Shutdown Mode for 鈥淕reen鈥?Systems

鈥?Supports Low Cost NTC/PTC Thermistors

鈥?Space Saving 8-Pin MSOP Package

TC649

Package Types

SOIC/PDIP/MSOP

V

IN

C

F

V

AS

GND

1

2

3

4

8

V

DD

V

OUT

FAULT

SENSE

PWM Fan Speed Controller with Auto-Shutdown

and FanSense鈩?Technology

TC649

7

6

5

General Description

The TC649 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 the V

IN

input fur-

nishes the required control voltage of 1.25V to 2.65V

(typical) for 0% to 100% PWM duty cycle. The TC649

automatically suspends fan operation when measured

temperature (V

IN

) is below a user programmed

minimum setting (V

AS

). An integrated Start-up Timer

ensures reliable motor start-up at turn-on, coming out

of shutdown mode, auto-shutdown mode or following a

transient fault.

In normal fan operation, a pulse train is present at

SENSE (Pin 5). The TC649 features Microchip

Technology鈥檚 proprietary FanSense

TM

technology for

increasing system reliability. A missing pulse detector

monitors this pin during fan operation. A stalled, open

or unconnected fan causes the TC649 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. See Section 5.0, 鈥淭ypical Applications鈥?

for more information and system design guidelines.

The TC649 is available in the 8-pin PDIP, SOIC and

MSOP packages and is available in the industrial and

extended commercial temperature ranges.

Applications

鈥?/div>

Power Supplies

Computers

File Servers

Portable Computers

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.

DS21449C-page 1

標準包裝
100
類別
集成電路 (IC)
家庭
PMIC - 電機和風(fēng)扇控制器，驅(qū)動器
系列
-
應(yīng)用
風(fēng)扇控制器，無刷（BLDC）
評估套件
-
輸出數(shù)
1
電流 - 輸出
-
電壓 - 負載
-
電源電壓
3 V ~ 5.5 V
工作溫度
0°C ~ 85°C
安裝類型
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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