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DC/DC converter having improved regulation

  • US 7,072,198 B2
  • Filed: 10/09/2003
  • Issued: 07/04/2006
  • Est. Priority Date: 10/09/2003
  • Status: Active Grant
First Claim
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1. In a switching mode converter having a switching transistor and an inductor, a discontinuous mode control circuit comprising:

  • a discontinuity detector coupled to the inductor that detects when the converter enters the discontinuous mode to generate a TRIP signal, the discontinuity detector determining the portion of a cycle of the switching transistor during which the converter is in discontinuous mode; and

    a feedback controller coupled to an output of the converter and to the discontinuity detector, which alters a feedback control signal of the converter responsive to the determined portion of the cycle of the switching transistor during which the converter is in discontinuous mode; and

    further comprising a freewheeling diode coupled to the inductor to discharge magnetic field energy stored in the inductor when the switching transistor shuts off; and

    wherein the discontinuity detector comprises a comparator coupled across the freewheeling diode and detecting when voltage across the diode is an appropriate polarity for reverse current flow to generate the TRIP signal.

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