Constant current source for interior LED lighting

Highly efficient and compact, LEDs have become the de-facto choice for interior lighting applications, from cluster backlighting to mood lighting. However, LEDs are sensitive to operating current so, for any single or string system, a constant steady state current is vital. That’s why constant current source devices make the ideal solution for driving LEDs in the electrically noisy environment of vehicles. Our space-saving NCR series complements the efficiency of LEDs perfectly with accurate and stable outputs.

Block diagram

Design considerations

  • Individually dimmable LED control
  • Accurate LED current control
  • Compact package (SOT23 / SOT457)
  • High efficiency driver design
  • Low EMI solution using small scale highly integrated package technology
  • Maximum drain current: 10 to 50 mA

Constant current LED drivers

While high power LEDs need complex driver schemes, the vast majority of applications use LEDs with currents below 500 mA and can be driven by linear constant-current LED drivers. These are easy-to-use, reliable, cost efficient, and do not affect EMC. This article gives a short overview on the design and power considerations necessary to use constant-current LED drivers in practical applications. 

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Selection Guide 2020

The 2020 edition of the Nexperia Selection Guide presents all our Discrete, Logic and MOSFET devices in one single document to give you a complete overview of our portfolio, making it easier for you to find the right product for your design.

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