Philips Semiconductors

Product data

P82CF201

Low power, low price dual fan manager

2

2002 Nov 18

853–2393 29207

GENERAL DESCRIPTION

The P82CF201 is a 20-pin single-chip dual digital fan controller

designed for use with brushless DC fan motors. A thermistor (or

provides the required resistance of 10K to 1.75 K

Ω for 30% to 98%

PWM duty cycle.

With temperature less than 25

°C (thermistor resistance more than

10 K

Ω) and THRESHOLD is set to LOW, the fan will be off. When

temperature rises above 25

°C (NTC thermistor at 10K or less), the

PWM turns the fan on. The P82CF201 features a Turn-on Delay for

a second fan when both fans have to turn-on. This reduces the

in-rush current and suppresses acoustic noise.

The P82CF201 also features fan fault sensing for enhancing system

protection and reliability. It detects the presence of a fan, when the

asserts the fault signal. The fault condition also triggers the

maximum PWM applied to the running fan. The fault is also asserted

when the thermistor resistance is less than 1.5 K

Ω (temperature is

over 76

°C).

FEATURES

acoustic and longer fan life

turn-on, coming out of fault condition, or following a transient fault

fan failure, overheat warning, no fan connect

turn-on, reducing high surge current and noise

components

components

Vss/Ground) for resistance between 10K (25

°C) and 15K (20 °C)

during cooling to avoid unnecessary fan turning during cool down

during fan failure

ORDERING INFORMATION

Type number

Package

Name

Description

Thermistor Range

Version

P82CF201BDH

TSSOP20

plastic thin shrink small outline package; 20 leads; body width 4.4 mm

NTC – 1.7 to 32 K

Ω

SOT360-1

PIN CONFIGURATION, 20-PIN TSSOP PACKAGES

SU01716

1

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

FAN1DRIVE

FAN2DRIVE

NC

FAULT

NC

NC

NC

NC

THRESHOLD

NC

NC

NC

10

P82CF201