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LP8861-Q1EVM schematics

Guru 20090 points

Hello,

In the LP8861-Q1EVM schematics , there are the capacitors of C10~C13 between Boost and OUT.
Could you please let me know the role of these capacitors?

Best Regards,
Ryuji Asaka

  • Hello Ryuji Asaka,

    Those caps were added for the short circuit testing. When shorting the boost output directly to the LED output the LED driver can be damaged if the dv/dt is too fast.

    Adding those capacitors will make the LP8861 pass the short test, but disadvantage is that the LED output rise/fall times in normal operation will slow down. So if the customer is interested in high dimming ratio and the boost output to LED output short testing is not a requirement, the capacitors can be removed.

    Kind Regards,

    David D Quintana