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Ballast control IC with minimal internal and external components

  • US 7,723,928 B2
  • Filed: 07/30/2008
  • Issued: 05/25/2010
  • Est. Priority Date: 06/19/2000
  • Status: Expired due to Fees
First Claim
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1. A ballast control IC comprising an oscillator circuit, a preheat circuit, and a start-up circuit, the oscillator circuit including only one comparator such that a smaller layout space is required and the overall size of the IC is reduced;

  • wherein the oscillator circuitry further comprises a capacitor coupled to the one comparator and operable to be charged and discharged to influence operation of the one comparator;

    further comprising a threshold voltage applied to the one comparator being selectively varied in dependence upon the charging or discharging of the capacitor; and

    further comprising a switch for selectively varying the threshold voltage, the switch being coupled to the comparator.

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