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AN770
| Title |
Title
Linear Voltage Fan Speed Control Using Microchip?s TC64x Family (TC642, TC646, TC648)
|
|---|---|
| Name |
Name
AN770
|
| Date |
Date
06/24/2015
|
| Application Categories |
Application Categories
Power Supply & Conversion /
Thermal Management
|
| Product Categories |
Product Categories
Power Management ICs /
PWM Controllers
Thermal Management /
Fan Controllers
|
| Description |
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.
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