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Flash driver to limit a load current of a flash and method to limit a load current of a flash driver

  • US 8,981,653 B2
  • Filed: 03/15/2013
  • Issued: 03/17/2015
  • Est. Priority Date: 04/13/2012
  • Status: Active Grant
First Claim
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1. A flash driver to limit a load current for a flash comprising:

  • a dc/dc converter having a first input to receive an input voltage and an output to supply an output voltage, and being designed to convert the input voltage to the output voltage;

    an adjustable current source connected between the output and a load terminal;

    a first control unit connected to the first input and coupled to the adjustable current source, and being designed to compare the input voltage to a threshold and, if the comparison indicates the input voltage being smaller than the threshold value, adjust the adjustable current source such that the input voltage is equal or greater than the threshold value; and

    a second control unit coupled to the adjustable current source and the dc/dc converter to detect a voltage drop over the adjustable current source and to set the dc/dc converter to control the conversion of input voltage to the output voltage depending on the detected voltage drop.

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