Fan Speed Control IC

Version

：A.002

PAGE 1

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FC122

FC122

Fan Speed Control IC

General Description

The FC122 is a linear fan-speed-control IC designed for power supply. It is a flexible

solution to fan speed control according to the NLX/ATX/PS98 fan speed control

specification.

The FC122 incorporate one linear fan-speed-control input, and one temperature

sensor input for fan-speed-control and monitoring ambient status. Additional output is

provided to report if temperature fault is sensed.

Features

Linear fan speed control for high reliable power supply use

NLX/ATX/PS98 fan control compliant

Low power consumption

Adjustable I/O voltage mapping for wide range of application design

Auto-started fan driving for over temperature protection

Fault output provided for easy programming control

Low pin count 8-pin DIP package

Block Diagram

300mS

delay

4

GND

8

VDD

3

VOT

1

FC

2

TS

300mS

delay

7

FLT

6

OUT

210 KΩ

35 KΩ

B

A

126 KΩ

114 KΩ

5

VST

VDD