I am working on a boost converter to go from from ~12v to 19v and deliver around 5A.
I am working with the evaluation board as a reference. I have been able to modify the evauation board to meet my requirements and it seems to do the job resonably well.
When it comes to replicating it I am not faring so well. The switching mosfet gets very hot very fast.
(what would be Q2 on the evaluation board)
I am using a RS1E280BN.
To try to narrow it down, I removed the part that was in the location of Q2 on the evauation board and installed a RS1E280BN. There was no quantifiable change with the evauation board, so I don’t think it’s the MOSFET selection. (which right now is somewhat difficult)
The MP3428A itself doesn’t get unreasonably warm remaining under 60c - and some of that I suspect is from Q2 as they are fairly close.
Layout is idential to the one in the datasheet.
I tried swapping some components between my board and the evaluation board like the inductor, but that made no difference.
Simply put, it works on the evauation board but when I migrate it to mine, it does not. Does anyone have any suggestions?