TC651 Microchip Technology Inc., TC651 Datasheet - Page 9

• Manufacturer Part Number: TC651
• Description: Tiny Integrated Temperature Sensor & Brushless Dc Fan Controller With Overtemperature Alert
• Manufacturer: Microchip Technology Inc.

5.0
5.1
For fans consuming more than 300 mA, a slowdown
capacitor (C
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
(DS00771), for more information.
FIGURE 5-1:
 2004 Microchip Technology Inc.
TYPICAL APPLICATIONS
Reducing Switching Noise
PWM Fan Speed
SLOW
Overtemperature
Microcontroller
) is recommended for reducing
PICmicro
Reducing Switching Noise.
SHDN
Control
Alert
®
Control
+5V V
Systems”
GND
DD
1
2
3
4
V
NC
SHDN
GND
DD
TC650
TC651
T
PWM
OVER
GND
NC
6
8
7
5
C
SLOW
TC650/TC651
+12V
GND
DC Fan
500 mA
DS21450C-page 9