Patent ID: 6885530
Filing Date: 2005-04-26
Classification: G05F,G06F

Abstract:
1. A power limiting circuit for a power supply controlled by a power supply control module comprising: a voltage (Vcomp) input operatively connected to the power supply control module for receiving a voltage indicative of a power supply error; a voltage (Vdd) output operatively connected to the power supply control module and an operating voltage for the power supply control module; a three terminal integrated circuit shunt regulator having a cathode, an anode, and a reference input operatively connected to said voltage (Vcomp) input, said shunt regulator being biased on when the voltage to the reference input increases above a reference voltage established at the voltage (Vcomp) input; a bipolar transistor operatively connected to said shunt regulator and being biased on from the shunt regulator such that said shunt regulator and transistor form a latch wherein the voltage at the (Vdd) output will reduce below a (Vdd) off voltage level to turn off the power supply, dropping the (Vcomp) input voltage and switching the power supply to a new cycle.