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LP8556: When use slope function, can't directly extinguish LED

Part Number: LP8556

Hi Team

My NB ODM customer use SLOPE function as 500mS, and when touch the power-off key, SOC will first give a BRT[7:0] value down to 0 first and then do the EN pin off or turn off BL_CTL function.

But we will see the LED turn-off around after 500mS. If we make SLOPE be 0mS, LED will turn off directly.

We think it is because SLOPE function influence. We even try to disable LED string LED_EN(0x16h), also will influence by the SLOPE function.

Do you have any good idea procedure to make LED turn off directly and also use 500mS SLOPE?

Thanks for feedback!

BR

Bruce