HiperLCS Core hot at no load

Posted by: bartek_zet on 03/07/2018

I'm designing 100V 2.5A power supply with Hiper LCS.
I observed very high core (3F3) temperature even without load (100 degree Celsius and rising).
Power supply is switching off after about 5 minutes with full load.

I changed image of waveform because previous one was wrong.

Files

Primary current at 1.3 A load (142.93 KB)

Comments

I had a same problem (with other power chip, other material core...) when my magnetic path has a gap. May be you have a same problem; hope help.

Hello danutstanciu,

Thank you for sharing the information and it is very helpful.

best Regards

Hello bartek_zet,

Thank you for interested in using Power Integrations product.

Is it possible for you to share the schematic? in this way, we can have a better understanding of the design and can dig in more to find the root cause.

By the way, how much input power is it with no load connected and full load connected.

Best Regards

if the core is hot at no load you are likely running the peak flux too high at the no load frequency.

Check that wire heating is not contributing to the Trise also...