TC651AGVUA(2004) データシートの表示（PDF） - Microchip Technology

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TC651AGVUA
(Rev.:2004)

Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert

Microchip Technology 

5.0 TYPICAL APPLICATIONS

5.1 Reducing Switching Noise

For fans consuming more than 300 mA, a slowdown

capacitor (CSLOW) is recommended for reducing

switching PWM induced noise (see Figure 5-1). The

value of this capacitor should be 4.7 µF to 47 µF,

depending on the fan current consumption.

See Application Note 771, “Suppressing Acoustic

Noise in PWM Fan Speed Control Systems”

(DS00771), for more information.

TC650/TC651

PICmicro®

Microcontroller

SHDN

Control

Overtemperature

Alert

+12V

+5V VDD

TC650

TC651

DC Fan

500 mA

1 VDD

PWM 8

2 NC

GND 7

3 SHDN TOVER 6

4 GND

NC 5

GND

CSLOW

GND

FIGURE 5-1:

Reducing Switching Noise.

 2004 Microchip Technology Inc.

DS21450C-page 9

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