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Switching regulators having a synchronizable oscillator frequency with constant ramp amplitude

  • US 5,929,620 A
  • Filed: 11/07/1996
  • Issued: 07/27/1999
  • Est. Priority Date: 11/07/1996
  • Status: Expired due to Term
First Claim
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1. A switching regulator circuit that provides a regulated voltage at an output terminal to a load, said switching regulator circuit comprising:

  • a switch circuit coupled to an input terminal and to said output terminal;

    an output circuit coupled to said output terminal, said output circuit providing a feedback signal that is representative of said regulated voltage;

    a control circuit coupled to said output circuit and to said switch circuit, said control circuit providing a control signal to said switch circuit so that said switch circuit interrupts current flow from said input terminal to said output circuit, said control signal being produced, at least in part, from said feedback signal;

    a voltage controlled oscillator circuit that provides an oscillator output signal to said switch circuit to control the frequency at which current is supplied to said output circuit from said input terminal, said voltage controlled oscillator circuit producing a ramp signal that varies from a minimum to a maximum value; and

    a signal control circuit coupled to said voltage controlled oscillator circuit, said signal control circuit controlling the frequency at which said voltage controlled oscillator circuit operates so that said minimum and maximum values of said ramps signal are substantially constant.

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