PWM DC Motor Speed Controller Driver 20A
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Prices updated: 12 Oct 2026
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About this product
A 20 A PWM DC motor speed controller that adjusts motor speed by changing the duty cycle of the output square wave, so the average voltage delivered to the motor varies. The same PWM principle is used for LED dimming. The listing does not state the full electrical ratings, so check the board label before powering it.
Specifications
- Rated current
- 20 A
- Control method
- PWM (duty cycle)
- Typical application
- DC motor speed and LED dimming
Frequently asked questions
How does PWM change the motor speed?
The controller switches the output fully on and off at a set frequency. Changing the on-time ratio, or duty cycle, changes the average voltage across the motor, which changes its speed.
What input voltage should I use?
The listing does not state the input voltage range. Check the printed label or the supplier's technical sheet for the supply voltage and motor rating before connecting power.
