Hi,
I had an earlier question on the forum.
These things have fortunately all been resolved.
However a new problem accured. When drawing some amount of current out of the converter everything is working as should. But after it has been running like that for a while and then switching the load off, there is a fair bit of heat dissipated in the reset P-FET. I can see the P-FET heating up after the load is switched off on a thermal camera.
1. I assume it is thermal related because when it has not been running long enough to heat up a bit this does not occur. (Sometimes recovers itself. Probably when it cools down in time before getting to hot.)
2. It only happens when the input voltage is over 60V. Under that range the converter works as it should.
3. When this happens a fairly loud audible hiss can be heard.
4. The quiescent current after, can be up to double it was before switching on the load.
I have measured this on the Drain of the P-FET
This is al seen on the Drain. So there seems to be some oscilation.
Any ideas on how to solve this?
