TC651BEVUA データシートの表示（PDF） - Microchip Technology

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TC651BEVUA

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

Microchip Technology 

4.0 TYPICAL APPLICATIONS

4.1 Reducing Switching Noise

For fans consuming more than 300mA, a slowdown

capacitor (CSLOW) is recommended for reducing

switching PWM induced noise (see Figure 4-1). The

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

depending on the fan current consumption.

See Application Note AN771 “Suppressing Acoustic

Noise in PWM Fan Speed Control Systems” for more

information.

FIGURE 4-1:

REDUCING SWITCHING

NOISE

+12V

+5V VDD

TC650

TC651

1 VDD

2 NC

PWM 8

GND 7 CSLOW

3 SHDN TOVER 6

4 GND

NC 5

GND

SHDN Control Over-Temp.

Alert

µController

DC Fan

500mA

GND

TC650/TC651

© 2002 Microchip Technology Inc.

DS21450B-page 7

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