Using 2xMP24833 in buck boost configuration

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1

Hi,
I am trying 2 use 2xMP24833 with 2 different LED strings each with 10 white LEDs.
Both are on the same board and share the same power supply. I am using DC dimming with 100% power at 1.6V.
When I populate one IC on the board, every thing works fine but as soon as the other IC is populated on the board, one of the IC fails always.
I am attaching the schematic below. I am using a buck boost configuration as per the development board.
Please help me out in this.

image
image1025×352 4.41 KB

Thanks,
Amitabh.

2

Hello dnd,

If each IC works fine alone but once another is connected that one does not maybe checking the power supply settings. I would check if the current limit is preventing this.

Please reach out if this continues.

3

Hello,
Yes, initially,I power the board with limited current and then slowly increase it to full. Either one smokes out and fails. I have tried with 5 different ic’s and all are failed now. Waiting for new IC’s to arrive.
This time I am ordering MPQ24833.
Is there any method to start the IC in some fail proof method?
Thanks for your response…