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Multiphase boost issue

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bowman1710

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Hi guys,

I am currently modifying the following development board from the initial 10-16V in to 36V 10A it was designed to do to 18-36V in to 50V 4A. The board is linked below:

http://www.intersil.com/content/dam/Intersil/documents/an17/an1727.pdf

I have made the following changes

Changed to only 3 phase channels
10uH for inductors
50V output with 18-36V Vin at 4A (so changed the feedback Vout sense Vin sense etc)

I have already done tests on with that all working no problem. The 60V MOSFETS seem a bit to close with ringing etc so I wanted to change the MOSFETS (attached). But now I changed to these then either the rectifying MOSFET blows or both on one phase. Any ideas why this is happening?

View attachment TPH1400ANH_datasheet_en_20140217 (1).pdf
 

BradtheRad

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You probably are aware it's important to keep a load attached at all times. With no load, output can soar to a high voltage, and you have the possibility of destroying components.

Going with your specs, I ran my simulation of a triple-interleaved boost converter. It may or may not be similar to your converter's topology. Anyway this screenshot shows waveforms you might expect.

 

bowman1710

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You probably are aware it's important to keep a load attached at all times. With no load, output can soar to a high voltage, and you have the possibility of destroying components.
Yes I am aware but with the feedback the output should be regulated it will just be a higher level of ringing seen on the MOSFET, I have kept the load the same for when I changed the MOSFETS it worked before so it must have something to do with these MOSFETS I am using but I couldn't see why they would blow. The ratings seem adequate for the job and the dead time programmed for the drivers shouldn't need changing (unless there is something i'm missing)
 

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