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LP2992: LV2862Y Predriver-->Overshooting LDO-->Damaged MCU

VG
Prodigy 110 points
Part Number: LP2992

Hi,

We have tested a circuit that takes a 10s cell pack which idles at 42V full charge and is connected to a LV2862Y dc dc converter to make 12V from the cells.
We also have an LDO at the 12V which generates 5V and is connected to an MCU. The circuit behaves really well when connected to a current limited power supply.

But when we insert a 10S battery pack, 12V output overshoots and fries a few components and also the LDO output overshoots and fries the MCU connected at its output.

The battery pack will be mostly hot plugged in this requirement.

Both the above devices have internal soft-start and this should not happen. We need expert opinion to solve this problem.

Kind regards

Vinod Ganesh

  • 0
    TI__Mastermind 47385 points

    Hi Vinod,

    Can you share the LP2992 schematic? Have you collected waveforms of the hot plug? If you could capture the 42V hot plug along with the DC/DC output and the LDO output that would be very helpful to understand why the device is overshooting. 

    What's the magnitude of the overshoot?

    Are they any series pads on the board where you could put a surge resistor to limit the inrush current?

    Thanks,

    Nick