Constant current source

For a number of applications where the load can vary, such as LED strings, the best way to ensure stable power driving is to use a constant current source. That is because these simple circuits can provide a constant steady state current independent of the load, producing an I-V characteristic represented by a straight line.

Block diagram

Design considerations

  • Should operate as close as possible to a 100% efficient source of current
  • Low EMI solution using small scale highly integrated package technology

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