| 摘要 |
Low voltage switched loads, such as magnetic tape write drivers, require a power source with a regulated voltage. A voltage regulator circuit includes a switched voltage regulator having an unregulated voltage input connected to an unregulated voltage source and an enabling input. The voltage regulator produces a regulated voltage at an output when the enabling input is asserted and produces high impedance at the output when the enabling input is unasserted. A capacitor is connected between the regulated voltage output and common voltage. A controlled precharge switch in series with a precharge resistor is connected between the unregulated source and the regulated voltage output. The precharge switch has a precharging input which closes the precharge switch when the precharging input is asserted. The circuit also includes a control logic operative to unassert the enabling input, assert the precharging input to close the precharging switch, unassert the precharging input after sufficient time to charge the capacitor to a voltage substantially the same as the regulated voltage, and assert the enabling input.
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