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Global Mixed-mode Technology Inc.

G760A

Fan Speed PWM Controller

Features

Constant Fan Speed Control

PWM control for stable operation

Build-in MOSFET switch

SMBus interface

Internal short-circuit protection

On/Off control provided

General Description

G760 is a single chip solution for fan speed control,

packaged in a space saving SO-8 package. It con-

nects directly to the fan and performs closed-loop

control of the fan speed. The only external compo-

nent required is a 10碌F capacitor. It determined the

current fan speed based on the fan rotation pulses

and an externally supplied clock. It uses pulse width

modulation (PWM) method and an on-chip

MOSFET to control the fan speed to

鹵2%

of the

programmed speed. The desired fan speed is pro-

grammed via the SMBus. The actual fan speed and

fan status can be read via the SMBus. Short-circuit

protection is implemented to prevent damages to

the fan and this IC itself. An On/Off control pin is

also provided.

Applications

Notebook PC

Industrial PC

LAN Switch

Servers

Telecom equipment

Industrial Control

Ordering Information

PART*

G760A

TEMP. RANGE

0擄C to +70擄C

PIN-PACKAGE

8-SOP

Pin configuration

G760A

OUT

F.G.

ON/OFF

GND

1

2

3

4

8

7

6

5

V

CC

SMBDATA

SMBCLKLK

CLK

8Pin SOP

Ver 4.3

Oct 28, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

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  Fan Speed PWM Controller
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