Few years ago I found a PSU (Delta, 500W) that works fine few minutes and then turn off itself. later I found that standby 5V (and ~12V to controller) ic TNY279 overheats and then shut down. replaced with new one and problem solved.
and I found few other PSUs with same problem. two mobile USB power packs too. all these had TNY278, 279
Anyone here had similar experience ?
How these chips fail such a way? looks like internal mosfet on resistance increase or current sense element failure..
and I found few other PSUs with same problem. two mobile USB power packs too. all these had TNY278, 279
Anyone here had similar experience ?
How these chips fail such a way? looks like internal mosfet on resistance increase or current sense element failure..
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