LMR14030: Why the inductor current will keep?

Hi Dylan

Can you please provide more details? Is this a phenomenon you observed during the circuit works and do you have any waveforms of this ?

Thank you.

Hi Gui,

Please check the waveform below. Actually, this waveform is from LMR14030 datasheet.

Thanks!

Hi Dylan

when the output is short, The iL peak is limited around 5.5A, as you can see from datasheet. Table 7.5.

Vo=0V,FB=0V. See from Fig.6 that the frequency is about 12.5kHz. Ts is around 16us.  And the iL decrease at the slope K= (VD/L),which is about (0.7V/5.6uH), so we can know the iL valley value is around 3.5A.

When the short is removed, the circuit recover to work normally, the iL is zero because there is no load.

Hope that helps ,Thank you.

Best regards.