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LT8611 damaged with absent input voltage

Hello,

we are using the LT8611 for charging a 12V lead acid battery.

When the  24V input voltage is removed the LT8611 will be destroyed. 

We added a diode like the recommendation from the LT8611 datasheet (page 18, figure 5) but this didn´t prevent the fault of the LT8611 when the input voltage is absent.

The schematic is attached below.

Any help is greatly appreciated,

Thomas

PDF

Edit Notes

correct spelling of Subject "damaged"
[edited by: ThomasStunder at 10:49 AM (GMT 0) on 3 Jul 2020]