Abstract: Power controllers, control methods and related integrated circuits for power supplies are disclosed. A power supply has a power switch and an inductive device. An exemplifying power controller comprises a first current source, a discharge time sensor, a representative current generator, and a pulse width modulator. The first current source generates a target current pouring to a compensation node. The discharge time sensor determines a discharge time of the inductive device. The representative current generator generates a representative current representing an inductor current of the inductive device. The pulse width modulator determines an output power of the power supply according to the compensation voltage at the compensation node. The representative current drains from the compensation node during the discharge time.