![]() That’s why we typically change the duty cycle to control things like LED brightness, DC motor speed, etc. And it directly affects the PWM’s total (average) voltage that most devices respond to. The duty cycle is usually expressed as a percentage ( %) value because it’s a ratio between two-time quantities. The PWM’s duty cycle equation is as follows: It’s a measure of how long the PWM signal stays ON relative to the full PWM’s cycle period. The PWM’s duty cycle is the most important feature that we’re always interested in. So we usually set the PWM frequency above that range.Īll in all, there are good reasons why we need and will control the PWM output signal’s frequency.
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