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TC651CCVUA Scheda tecnica(PDF) 7 Page - Microchip Technology |
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TC651CCVUA Scheda tecnica(HTML) 7 Page - Microchip Technology |
7 / 14 page © 2002 Microchip Technology Inc. DS21450B-page 7 TC650/TC651 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 4.7 µFto47µF, 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 1 8 2 7 3 6 4 5 NC VDD CSLOW PWM GND TOVER NC GND GND +5V VDD +12V TC650 TC651 SHDN GND µController DC Fan 500mA SHDN Control Over-Temp. Alert |
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