Patent ID: 6023156
Filing Date: 2000-02-08
Classification: G05F

Abstract:
A voltage regulation circuit for supplying regulated voltage to a switched load comprising:a switched voltage regulator having an unregulated voltage input connected to an unregulated voltage source, a common input connected to common voltage, an enabling input, and a regulated voltage output, the voltage regulator operative to produce a regulated voltage at the output when the enabling input is asserted and to produce high impedance at the output when the enabling input is unasserted;a capacitor connected between the regulated voltage output and the common voltage;a controlled precharge switch in series with a precharge resistor connected between the unregulated source and the regulated voltage output, the precharge switch having a precharging input operative to close the precharge switch when the precharging input is asserted and to open the precharging switch when the precharging input is unasserted; anda control logic in communication with the enabling input and the precharging input, the control logic operative to(a) unassert the enabling input,(b) assert the precharging input to close the precharging switch,(c) unassert the precharging input to open the precharging switch after sufficient time to charge the capacitor to a voltage substantially the same as the regulated voltage, and(d) assert the enabling input.