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LTC7891 broken after set VPRG to GND (Vout=5V)

Category: Hardware
Product Number: LTC7891

Hi,

I've modified my DC2995A board (factory setting is Vout=12V) to set Vout=5V and the LTC7891 has broken after applying Vin=48V with no Load.

Here are the changes I've made:

  • Removed R17 (10R) from Vout feedback (disable adjustable output mode)
  • Set VPRG to GND (R76=0R) to get Vout=5V

What's could be wrong with this setup?

regards,
gaston