LM5020: slope compensation design

user5338584

Prodigy 20 points

Part Number: LM5020

the LM5020-1 Max Duty Cycle limiting is 80%，how to design slope compensation for it

the attached is the test waveform of flyback base on LM5020, how to optimize it

the CH2 is the driver, the duty of driver is variation

this waveform is current

over 5 years ago

0 Garrett Roecker over 5 years ago

TI__Mastermind 21720 points

Hello,

Thanks for reaching out with your question.

Based on your waveform it looks like the loop might be unstable. Please provide the schematic and the operating conditions that the waveforms were captured.

-Garrett

0 user5338584 over 5 years ago in reply to Garrett Roecker

Prodigy 20 points

if decreasing the input voltage，the duty is lower than 50%，the current and duty is stable，so I think it`s not just the loop unstable, the slope compensation is the key point.

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LM5020: slope compensation design