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Reducing the power dissipation when driving short LED chains

Reducing the power dissipation when driving short LED chains

Infineon_Team
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To reduce power dissipation in the LITIX Basic+ devices, when driving short LED chains, it is possible to add a Zener diode or resistor in series with the LEDs. 

The implementation is shown on the figure below:

Image1.png

 Figure 1: Addition of Zener diode or resistor in series with LEDs

All configurations need to be confirmed in the real application. In order to determine the proper Zener diode or resistor value it is needed to be considered:

  • the minimum battery voltage Vs;
  • the required voltage drop for current control VPSx(CC) (datasheet parameters P_6.5.36 - P_6.5.39);
  • and the maximum LED voltage drop.
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