Patent ID: 6717458
Filing Date: 2004-04-06
Classification: H02M

Abstract:
An apparatus for providing an output signal from a supply signal that has an associated voltage level, the apparatus comprising:a control circuit that is configured to produce a control signal in response to the supply signal and a feedback signal that is associated with the output signal; a first multiplier circuit receiving the control signal to produce the output signal by multiplying the supply signal according to a first multiplication factor, wherein the first multiplication factor is adjusted to compensate for a change in the supply signal; a second multiplier circuit that is selectively coupled to the first multiplier circuit such that the first and second multiplier circuits produce the output signal in response to multiplying the supply signal by a second multiplication factor when the second multiplier circuit is coupled to the first multiplier circuit, wherein the second multiplication factor is greater than the first multiplication factor when the supply signal decreases below a predetermined level; the feedback circuit that is configured to provide a feedback signal in response to receiving the output signal, wherein the control circuit provides regulation of the output signal in response to the feedback signal.