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Digital feedback power supply

  • US 5,969,514 A
  • Filed: 11/24/1997
  • Issued: 10/19/1999
  • Est. Priority Date: 11/24/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus including an integrated digital feedback power supply circuit for providing a signal to an external circuit, the digital feedback power supply circuit comprising:

  • an output node configured to couple to an external circuit and convey an output power signal, wherein an amount of power the external circuit draws varies;

    a switching array circuit comprising three or more switches, each of the three or more switches being individually controlled to provide a switching output signal;

    an output circuit coupled to the switching array circuit and configured to receive the switching output signal and in accordance therewith generate the output power signal to the output node;

    a monitoring circuit coupled to the output node and configured to monitor the output power signal from the output circuit and in accordance therewith generates a digital feedback signal; and

    a control circuit coupled between the monitoring circuit and the switching array circuit,wherein when the control circuit receives the digital feedback signal from the monitoring circuit, the control circuit compares a magnitude of the digital feedback signal to a reference signal value to determine a number of the three or more switches that need to be active to satisfy the amount of power drawn by the external circuit.

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