I'm planning to power the circuit from a micro usb charger rated 1.8A. The peak current for the circuit is 1.5A but if the charger is not providing enough current I can use PWM with e.g. a 50% duty cycle, then the average current should be 0.75A (half of 1.5A).
I suppose to average out the current so that to the supply it looks like a constant 0.75A I need a capacitor. Provided the PWM is at approx 1.5KHz with 320uS ON and 320uS OFF and the voltage is 5V what type and value of a capacitor should I use on the input (preferably a smaller size)?