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LM5009: Switching pulse at PFM operation

S.Satoshi
Guru 21675 points
Part Number: LM5009

Hi,

The customer is evaluating LM5009 and they found that the switching pulse count is varied depend on input voltage. I tried to measure by using EVM with default external components and then could duplicate it as attached. 

[Question]

Can you explain how the converter judge to stop switching? (From Fig1, it looks the switching is stopped when FB pin voltage reach to 2.51V (Vref + 10mV).)

Best Regards,

Satoshi