UCD3138A: UCD3138A Front End Dither Mode

han xu

Part Number: UCD3138A

Hi,

The issue is that the dither mode can increase the regulation precision, however, it also will cause the low-frequency oscillation on the output voltage ripple when the loop bandwidth is high enough. Is there any way to eliminate the LFO?

over 6 years ago

0 Bosheng Sun over 6 years ago

TI__Expert 7310 points

what's your switching frequency?

0 Bosheng Sun over 6 years ago in reply to Bosheng Sun

TI__Expert 7310 points

The dither is usually used for current sharing between two power supplies, if you do not need current sharing, then you can turn off the dither function. It is true that dither can cause output ripple, there is not much you can do to eliminate it, but the ripple is usually very small. Just as the old saying, there is no free lunch, you have to pay something when you gain something.

0 han xu over 6 years ago in reply to Bosheng Sun

Prodigy 80 points

ok. Thanks.

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UCD3138A: UCD3138A Front End Dither Mode