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LM5117: LM 5117 DESIGN PROBLEM

Part Number: LM5117

Hello, still struggling with the LM5117 we have bougth the official demo board (it has same characteristics we need). And it is running perfectly  how it should to.

So we decided to updated our circuit with all the same parts value as in the demo board.

Results: very bad, our circuit does not run at all! We are still wandering how a pcb circuit layout can be so important!

Any way now  we would like to copy and import in our design the demo board pcb.

Can you send us PCB file? we use Altium (an old 13 version to be honest...) 

Any help would be very apreciated

Best regards

Francesco