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How to configure the D-pin and DS-pin of LITIX™ Basic+?

How to configure the D-pin and DS-pin of LITIX™ Basic+?

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The configuration of D-pin and DS-pin depends on the fault management required in the application.

The D-pin activates or de-activates the N-1 behavior, when a fault (OL, SC, SLS) is detected. N-1 is the behavior, if 1 LED or LED chain fails all LEDs are OFF.
Below the possible configurations in order to activate or de-activate the N-1 behavior:

  • D-pin connected to GND: N-1 is de-activated. The LEDs which are not failing will remain ON. The failure is communicated via the ERRN
  • D-pin left open: N-1 is activated. All LEDs will switch OFF immediately
  • D-pin connected to a capacitor: N-1 is activated. All LEDs will switch OFF after delay time defined by the capacitor

D-pin configuration.png

The DS-pin defines the driver's reaction to a single LED short failure (SLS). Below the possible configurations:

  • DS-pin connected to GND: Latched behavior. All LEDs are switched OFF
  • DS-pin connected to a capacitor: Restart behavior. All LEDs are OFF and the driver performs a load reactivation retry with wait time cycle tsl(wait)

When the SLS detection is not required in the application, it can be de-activated by: 

  • Connect SLS_REF-pin to GND and
  • Leave DS-pin open

DS-pin configuration.png

Note: OL and SC detection will not be de-activated!

More details on the fault management can be found in the datasheet and the "Diagnosis and fault management" application note, available at https://www.infineon.com/cms/en/product/power/lighting-ics/litix-automotive-led-driver-ic/litix-basi...