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Part Number: LM5034
My customer use LM5034 for flyback application. And there has a issue in it.(Schematic is showing below.)
PMOS1(Q11) & PMOS2(Q12) (temperature increase when no load)
yellow:Q11 red:Q12 blue:load current
yellow:Q11 red:Q1/Q2 blue:load current
The LM5034 is not a flyback controller. It is an interleaved active clamp forward type of controller.We have no reference material available for this part in a flyback application.
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In reply to John Griffin1:
I'm not familiar with flyback and interleaved active clamp forward topology.
As attached schematic, I think customer using interleaved active clamp forward topology and it occurred the issue that I described.
Do you have any idea why the condition occurred? or we could test the which node waveform could verify the issue? Thank you.
In reply to Roy Chou1:
Sorry about the delay in respondingThe schematic shows a flyback designIcan tell this because there is no output inductor and because of the out of phase relationship between the primary and secondary.
The LM5034 is a forward controller and so the relationship between the main FET timing and the auxiliary FET timing will be only valid for a forward design..It is not designed for use in a flyback circuit.
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