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Circuits and methods for driving light sources

  • US 8,890,440 B2
  • Filed: 08/19/2013
  • Issued: 11/18/2014
  • Est. Priority Date: 03/04/2010
  • Status: Expired due to Fees
First Claim
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1. A controller for controlling power to a light source, said controller comprising:

  • a first sensing pin operable for receiving a first signal indicating an instant current flowing through an energy storage element;

    a second sensing pin operable for receiving a second signal indicating whether said instant current decreases to a predetermined current level;

    a driving pin operable for providing a driving signal to a switch to control a current flowing through said light source to a target current level, wherein said driving signal is generated based on one or more signals selected from said first signal and said second signal;

    an error amplifier operable for generating an error signal based on said first signal and also based on a reference signal indicating said target current level, wherein the output of said error amplifier is coupled to a capacitor, anda power pin operable for receiving a voltage to power said controller,wherein said controller determines whether said light source is in a short circuit condition according to said voltage.

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