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DRIVER CIRCUIT WITH EXTENDED OPERATION RANGE

  • US 20170055322A1
  • Filed: 02/13/2015
  • Published: 02/23/2017
  • Est. Priority Date: 02/24/2014
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a driver circuit comprising switched capacitor a voltage converter having multiple operating modes;

    a controller operable to control a ratio between an input voltage supplied to the driver circuit and a target output voltage to be output from the driver circuit by varying a duty cycle of a pulse width modulated signal, and by switching between operating modes of said voltage converter;

    wherein the controller is configured to determine that the driver circuit is operating in an undesired state caused by a combination of the duty cycle and the operating mode of the converter said undesired state corresponding to an efficiency below a threshold efficiency level; and

    a resistance adjustment circuit configured to adjust an equivalent output resistance of the driver circuit in response to said determination.

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