Patent ID: 6310467
Filing Date: 2001-10-30
Classification: G05F

Abstract:
An apparatus that regulates a regulation voltage across a load from an unregulated power supply, comprising:a series regulator circuit is arranged to selectively couple power from the unregulated power supply to the load in response to a control signal;a feedback circuit is arranged to provide a feedback voltage from the regulation voltage, wherein the feedback voltage is at least a portion of the regulation voltage;a power control circuit is arranged to selectively couple power from the unregulated power supply to an internal power supply when activated by an over-temperature signal;a temperature sensor circuit is arranged to provide an over-temperature signal when an over-temperature condition is detected;a diode circuit is arranged to couple power from the regulation voltage to the internal power supply when the power control circuit is deactivated such that the internal power supply is regulated when the power control circuit is deactivated; andan error amplifier circuit is arranged to produce the control signal in response to a reference voltage and the feedback voltage, wherein the error amplifier is arranged to operate from the internal power supply whereby the regulation voltage has an improved power supply rejection ratio.