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Power-supply device and hard disk drive using same

  • US 20050127881A1
  • Filed: 08/06/2004
  • Published: 06/16/2005
  • Est. Priority Date: 12/16/2003
  • Status: Active Grant
First Claim
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1. A power-supply device of a step-down type DC-DC converter provided with a power semiconductor switching device, driving means of the power semiconductor switching device, a pulse-width modulation oscillator that supplies a driving signal to the driving means and an error amplifier that supplies an error signal with reference voltage to the oscillator, comprising:

  • a power output filter that passes output power; and

    first and second filters provided separately from the power output filter, wherein;

    the first filter and one input terminal of the error amplifier are connected;

    differential voltage between the output of the second filter and the output of the power output filter is added to the reference voltage; and

    voltage acquired by the addition is input to the error amplifier.

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