Infineon XMC LED Current Control Explorer Kit Getting Started page 37

Getting Started
Adopting SW to Your LED Engine (3/6)
6. Open the UI of GLOBAL_BCCU APP
7. Change the frequency of FCLK such that the bit-time is the
same as the LED current rise time or fall time, whichever is
longer
– This is to ensure the following criteria are met:
a. During an ON bit, there is enough time for the LED current to
reach the desired peak level
b. During an OFF bit, there is enough time for the LED current to
reach zero
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