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DRIVER CIRCUIT FOR LIGHT-EMITTING DIODES

  • US 20150008837A1
  • Filed: 11/28/2012
  • Published: 01/08/2015
  • Est. Priority Date: 01/17/2012
  • Status: Active Grant
First Claim
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1. Driver circuit for light-emitting diodes, comprisinga first DC/DC converter (DCDC1) with an input (IN) for feeding a supply voltage (VBAT) and with a first output (OUT),a second DC/DC converter (DCDC2), which is coupled on the output side to the first output (OUT) and is designed for operation with energy supplied in advance,a current source (IFlash), which is connected to the first output (OUT), anda main output (LED_OUT), which is coupled to the current source (IFlash) and is designed for connecting to the light-emitting diodes,wherein the first DC/DC converter (DCDC1) is designed for operation in a current-limiting mode and wherein the second DC/DC converter (DCDC2) is designed for regulation to a nominal voltage (Vds) of the current source (IFlash), andwherein the driver circuit is designed for operation in a flash mode, in which a flash is triggered with the aid of the light-emitting diodes, for which a constant power for the light-emitting diodes is provided at the main output (LED_OUT) for the duration of the flash.

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