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I am not sure what you are looking for. Do you want a current limited power supply? Or are you trying to limit the current the PWM uses from an existing fixed supply?
Limiting the current of that the PWM uses is most often done as a peak limiter. One way is to place a small value resistor in the emitter circuit or the source circuit, depending on BJT or MOSFET. These resistors tend to reduce the drive of the transistor as the current demand goes up.
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