Wiring an L298N Motor Driver Module to an Arduino This is why the L298N based motor drivers require a big heatsink. This excess voltage drop results in significant power dissipation in the form of heat. The image below shows PWM technique with various duty cycles and average voltages. The shorter the duty cycle, the lower the average voltage applied to the DC motor, resulting in a decrease in motor speed. The higher the duty cycle, the higher the average voltage applied to the DC motor, resulting in an increase in motor speed. This average voltage is proportional to the width of the pulses, which is referred to as the Duty Cycle. PWM is a technique in which the average value of the input voltage is adjusted by sending a series of ON-OFF pulses. A widely used technique to accomplish this is Pulse Width Modulation (PWM). The speed of a DC motor can be controlled by changing its input voltage.
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