LM5143: The secondary LM5143's DITH pin connection in multiple phase application

Ken Zhang

Part Number: LM5143

Tool/software:

hi,

when 2 pcs of LM5143 are designed with multiple phase single output, how the secondary LM5143's DITH pin is connected?(in datasheet, DITH pin of 2rd LM5143 is float)?

over 1 year ago

0 Timothy Hegarty over 1 year ago

TI__Guru 73752 points

Hi Ken,

The second controller has a SYNC signal, which overrides any spread-spectrum behavior. You can leave DITH open or tie it high to VDDA.

Regards,

Tim

0 Ken Zhang over 1 year ago in reply to Timothy Hegarty

TI__Expert 3595 points

Timothy

if the master LM5143's spread-spectrum is enabled, the spread-spectrum behavior can be found with 2rd LM5143 as SYNC signal from the master LM5143. Is it right?

+1 Timothy Hegarty over 1 year ago in reply to Ken Zhang

TI__Guru 73752 points

Yes, correct.

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LM5143: The secondary LM5143's DITH pin connection in multiple phase application