Patent ID: 7368894

Claim:
A power supply comprising: a current sense circuit including a current sense terminal of a power supply controller of a voltage regulation circuit, wherein a voltage difference between the current sense terminal and a voltage reference terminal of the power supply controller of the voltage regulation circuit is substantially fixed when a first current to be sensed by the current sense circuit at the current sense terminal is substantially equal to a first current sense threshold; a power transistor coupled to the current sense circuit and coupled between a drain terminal of the power supply controller and the voltage reference terminal of the power supply controller, the drain terminal coupled to a power supply input terminal of the voltage regulation circuit and the voltage reference terminal electrically coupled to a power supply output terminal of the voltage regulation circuit, the power transistor coupled to be switched in response to the first current to be sensed by the current sense circuit at the current sense terminal to control a transfer of energy from the input of the power supply to the output of the power supply to regulate an output voltage of the power supply; and a first impedance coupled to conduct a second current between the current sense terminal and the voltage reference terminal, wherein a second current sense threshold is equal to a sum of the first current sense threshold and the second current.