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Self-oscillation type DC-DC converter having a driving transistor connected in parallel to a circuit element for starting a switching element

  • US 5,689,178 A
  • Filed: 07/16/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 07/25/1995
  • Status: Expired due to Fees
First Claim
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1. In a non-isolated self-oscillation type DC-DC converter for turning on and off an inputted dc voltage by means of a switching element and supplying a stabilized dc output voltage to a load through a smoothing circuit including a diode, a choke coil and a smoothing capacitor connected to a current output terminal of the switching element, the self-oscillation type DC-DC converter comprising:

  • wherein said switching element is a MOSFET, a control terminal of said switching element being connected to ground through a starting resistor;

    a first driving transistor, a current input terminal of which is connected to a current input terminal of said switching element and a current output terminal of which is connected to a control terminal of said switching element;

    a feedback circuit, the feedback circuit being connected between said current output terminal of said switching element and a control terminal of said first driving transistor; and

    a second driving transistor, a main current path of which is connected in parallel to said starting resistor, and a control terminal of which being connected to said feedback circuit through a capacitor element.

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