LM5180-Q1: LM5180

Jordan Kutzarov

Part Number: LM5180-Q1
Other Parts Discussed in Thread: LM5180

Flyback circuit based on LM5180. Converts 36 V into +/-150 V. Transformer is 750311692 (Midcom). Circuit designed with the online tool, but controller keeps blowing up. Using two transformers with primaries in series helped build a working prototype, but reliability still insufficient. Circuit applied to this description. Please suggest a working flyback circuit with 36V in and 150V out. The converter is intended to be used as a kickstart for VICOR powerful converters.

over 2 years ago

0 Marshall_Beck over 2 years ago

TI__Mastermind 29690 points

Hello Jordan, I am going to review your design.

Do you have any waveforms to provide of the failure?

0 Jordan Kutzarov over 2 years ago in reply to Marshall_Beck

Prodigy 10 points

Unfortunately not. The converter blew up my absence. Please comment if something can be improved.

0 Marshall_Beck over 2 years ago in reply to Jordan Kutzarov

TI__Mastermind 29690 points

Understand, Jordan.

I hope to follow up with you on the review, Monday.

0 Marshall_Beck over 2 years ago in reply to Marshall_Beck

TI__Mastermind 29690 points

Hello Jordan,

The transformer saturation current appears to be at 1A.

That is low given peak primary current limit. I would recommend connecting transformers in parallel, in addition, implementing a DZ clamp on SW to ensure no electrical overstress on switch with the large leakage inductance voltage spike.

Stability also may be a concern with high mag inductance. Parellel primary config wiill be better potentially from stability stand point.

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LM5180-Q1: LM5180