LP8864S-Q1: LP8864S-Q issue

Hi, Muxia

Could you pls confirm that voltage on VDD pin is stable all the time?

hello, Zhiqian

thanks for your reply.

please see the waveform. I think it is OK even if it have some fluctuation.

Hi Muxia,

Our expert will give you reply later.

HI, Muxia

May I ask why VDD pin will drop to 3V, very close to UVLO threshold? Could you pls check if it still happened with external stable VDD?

hello, Zhiqian

yes， i check with stable VDD， but it still happened.

please see the waveform.

Hi, Muxia

I have called you but no answer. Lets align in the phone.

hello, Zhiqian

when it happened , the i2c value is read as below.

  {BRT_CONTROL,     0x0000},

    {LED_CURR_CONFIG, 0x0FFF},

    {USER_CONFIG1,    0x08A3},

    {USER_CONFIG2,    0x0100},

    {SUPPLY_INT_EN,   0x0000},

    {BOOST_INT_EN,    0x0000},

    {LED_INT_EN,      0x0082},

    {SUPPLY_STATUS,   0x0020},

    {BOOST_STATUS,    0x0020},

    {LED_STATUS,      0x0000},

Hi, Muxia

Depending on your feedback, you disable the SUPPLY interrupt and BOOST interrupt. And device reported the fault for boost_OCP and VDD_UVLO.

    {SUPPLY_INT_EN,   0x0000},

    {BOOST_INT_EN,    0x0000},

    {SUPPLY_STATUS,   0x0020},

    {BOOST_STATUS,    0x0020},

hello, zhiqian

thanks for your support.

can you explain the boost OVP LOW will be happened at which scenes even the device remains in normal mode with
LED drivers operational？ thanks.

BR

Muxia Zhang

Hi, Muxia

OVPL may trigger during the startup, it is related with the overshot during the startup.