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AN770

Title:
Linear Voltage Fan Speed Control Using Microchip?s TC64x Family (TC642, TC646, TC648)
Name:
AN770
Date:
07/27/2004
Author:
Don Alfano
Description:
PWM fan speed control methodology pulse-width modulates a fan?s full-rated power supply voltage at a low frequency, typically 30Hz. A typical PWM circuit, consisting of a transistor in series with a fan, can be small and inexpensive because it is either fully on or completely off. This efficient control methodology affords a very wide speed control range (typically 10% to 100% of full speed) because the fan motor is exposed to its full-rated voltage during the active portion of the PWM cycle.
Keywords:
Fan Speed Control,Pulse Width Modulation,PWM,BDC
 
Application Notes & Source Code
 Last Updated
Size
 
  AN770
  07/27/2004
  203KB
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