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AN771
| Title |
Title
Suppressing Acoustic Noise in PWM Fan Speed Control Systems
|
|---|---|
| Name |
Name
AN771
|
| Date |
Date
06/24/2015
|
| Application Categories |
Application Categories
Power Supply & Conversion /
Thermal Management
|
| Product Categories |
Product Categories
Power Management ICs /
PWM Controllers
|
| Description |
Description
Fan speed control extends fan service life and decreases acoustic airflow noise and average fan current. The most efficient way to implement fan speed control is to use low frequency pulse width modulation (PWM). However, PWM fan speed control can sometimes introduce unwanted acoustic noise at a frequency equal to that of the PWM itself. This is especially noticeable when PWM control is used with higher operating current (>300 mA) fans and at low operating speeds. This application note discusses the source of this acoustic noise and a method to suppress it.
|
Silicon Products
| Description | Product |
Description |
|---|---|---|
|
TC642
TC642
|
TC642 | TC642 |
|
TC648B
PWM Fan Speed Controller with Temp Proportion
|
TC648B | PWM Fan Speed Controller with Temp Proportion |
|
TC649
TC649
|
TC649 | TC649 |
|
TC646B
PWM fan speed controller with temperature proportional control, thermistor input,
|
TC646B | PWM fan speed controller with temperature proportional control, thermistor input, |
|
TC647
PWM fan speed controller with temperature proportional control, thermistor input,
|
TC647 | PWM fan speed controller with temperature proportional control, thermistor input, |
|
TC649B
PWM fan speed controller with temperature proportional control, thermistor input,
|
TC649B | PWM fan speed controller with temperature proportional control, thermistor input, |
|
TC646
PWM fan speed controller with temperature proportional speed control, thermistor input,
|
TC646 | PWM fan speed controller with temperature proportional speed control, thermistor input, |
|
TC647B
PWM fan speed controller with temperature proportional control, thermistor input,
|
TC647B | PWM fan speed controller with temperature proportional control, thermistor input, |
|
TC642B
TC642B PWM fan speed controller with temperature proportional control
|
TC642B | TC642B PWM fan speed controller with temperature proportional control |
|
TC648
PWM fan speed controller with temperature proportional control, thermistor input
|
TC648 | PWM fan speed controller with temperature proportional control, thermistor input |