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ADP1048-EVALZ Blew Up at first turn-on


I recently got an ADP1048 Evaluation board (600W PFC), I installed the driver, connected the board, the GUI recognized it and communicated fine.

When I started applying the input AC voltage (using a Variac) the fuse blew, this was done with no load connected on the DC bus.

After replacing the fuse, the board will no longer communicate with the PC, the power components seem to be still intact (the all measure diode drops where expected), the ADP1048 is getting 3.3V at its VCC pin...

Any ideas for why this might have happend?

Any help would be greatly appreciated,


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