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Error amplifier and DC-DC converter and the method thereof

  • US 20040160270A1
  • Filed: 08/12/2003
  • Published: 08/19/2004
  • Est. Priority Date: 02/18/2003
  • Status: Active Grant
First Claim
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1. An error amplifier, comprising:

  • a soft start signal;

    an input signal;

    a reference voltage;

    an output signal converging to a steady state voltage;

    a first amplification stage for amplifying the difference between the reference voltage and the input signal;

    a clamp stage for clamping the output signal to the soft start signal when the soft start signal is smaller than the steady state voltage;

    a buffer stage for driving the output signal; and

    a second amplification stage including a first transistor controlled by the first amplification stage and a second transistor controlled by the clamp stage, wherein the outputs of the first transistor and second transistor are electrically connected to the buffer stage.

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