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AN3530

Title:
PID Fan Speed Control for 4-Wire Fans
Name:
AN3530
Date:
08/10/2020
Author:
Keith Curtis
Description:
In today’s electronics, air moving fans provide a critical service in that they cool the system power electronics. However, just running the fan at full speed has a disadvantage in that it can produce significant audio noise. Therefore, most modern systems regulate the speed of the fan so they can balance the requirements of cooling and noise abatement. Given that the fan speed is also significantly affected by restrictions on the airflow, both into (dirty air filter) and out of (blocked outlet ports) the fan, some form of fan speed regulation is typically needed to maintain consistent cooling. This application note will cover a relatively simple, low-cost solution for managing the fan speed, using a software-based Proportional Integral Differential (PID) fan speed control.
Keywords:
Proportional Integral Differential (PID), fan speed, fan speed control, Tachometer Input, Fan Speed Drive, RTCC, serial EEPROM
 
Application Notes & Source Code
 Last Updated
Size
 
  AN3530
  08/10/2020
  184KB
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