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LP8861Q1-EVM: Unstable with Minimum Pulsewith @ 500ns

Dear Team,

the LP8861Q1 states in the data sheet a minimum pulse width of 500ns.

Evaluating the EVM, the device's current is unstable. Within the first ~10sec everything works fine, however later the current goes back to 50% (see purple trace):

What could be the reason behind this behavior?

Thanks and best regards
Martin