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TC653EFVUA 데이터시트(PDF) 7 Page - Microchip Technology |
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TC653EFVUA 데이터시트(HTML) 7 Page - Microchip Technology |
7 / 14 page © 2002 Microchip Technology Inc. DS21453B-page 7 TC652/TC653 TABLE 3-3: TEMPERATURE SELECTION GUIDE Note: The Bold Type temperature settings are available for ordering. Contact factory for other temperature selections. TL and TH canbe selectedin5°C increments. TH must be chosen at least 10°C higher than TL.TL can range anywhere from 25°C to 35°C. As an example, suppose you wanted the fan to run at 40% speed at 25°C or less and go to full speed at 45°C. You would order the part number TC652AEVUA. As another example, suppose you wanted the fan to turn on at 30°C and go to full speed at 45°C. You would order the part number TC653BEVUA. 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 Temp. Range °C TL TH Part # 10°C 25 35 AC 30 40 BD 35 45 CE 15°C 25 40 AD 30 45 BE 20°C 25 45 AE 30 50 BF 35 55 CG 30°C 25 55 AG 1 8 2 7 3 6 4 5 VDD PWM GND TOVER NC GND GND +5V VDD CSENSE CSLOW 0.01µF 10µF RSENSE 2 Ω 1k Ω +12V TC652 TC653 SHDN FAULT GND µController DC Fan 400mA Max. SHDN Control Fan Fault Alert Over-Temp Alert - |
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