A method which regulates a power supply is disclosed. In one aspect of the invention, the method includes sensing an excess control current through a control terminal with a control current sensor circuit. A transistor is switched with a control circuit in response to the control current sensor circuit and an oscillator that is coupled to a trim circuit, which is trimmed during manufacture of a circuit, to regulate the output of a power supply. A current through the transistor is limited with a current limit circuit that is coupled to the trim circuit, which is trimmed during manufacture of the circuit. A maximum deliverable power value of the power supply is determined by said trimming of the trim circuit during manufacture of the circuit.