LMR14030-Q1: Spread spectrum swing frequency

Yes, the spread spectrum time Tss=8*32/f, if the f=2.2MHz, the swing frequency of spread spectrum is nearly 8.6KHz.

Hi, Thank you for your reply. They should estimate the output voltage ripple. So they would like to make sure the effects of swing frequency on the output voltage ripple. How much is the output voltage ripple which be occurred by swing frequency?

Best Regards,
tateo

Hi Tateo,

On your screen shot, the grey waveform has ripple with period of 12.5us or the freq is about 8KHz, this is caused by freq dithering.you think it as the yellow ripple ride on the 8KHz modulation ripple.

Belowis out testing on Fsw=500KHz, it has similar result as yours.

Hi, Thank you for your reply. I can't see your waveform. Please attach your waveform again?

Best Regards,

tateo

Hi, Could you attach your testing waveform?

Best Regards,

tateo

Can you see below?