TPS54418: output voltage swing with changing from external clock to RT/CLK resister

Kai Nomiyama

Expert 5365 points

Part Number: TPS54418

Hi Team,

I have a question about output voltage swing with changing from external clock to RT/CLK resistor.

the output voltage swings if the external system clock is to be removed on the falling edge of the clock.

The question here is are there any way to reduce output voltage swing level?

Thanks,

Kai

over 6 years ago

0 JohnTucker over 6 years ago

TI__Guru**** 191445 points

Kai,

If the external clock is removed while the TPS54418 is operating, then the switching frequency will go to a low value while the clock re-synchronizes to the RT frequency. We recommend that you not remove the external clock while the converter is active.

0 Kai Nomiyama over 6 years ago in reply to JohnTucker

TI__Expert 5365 points

Hi John,

I understand your comment but there is one more question.

in the system, my customer has to remove the external clock while the converter is active.
I understand switching frequency will go to low value but are there any other concern while the external clock is removed?

Thanks,
Kai

0 JohnTucker over 6 years ago in reply to Kai Nomiyama

TI__Guru**** 191445 points

Kai,

That is the only concern. There are consequences with it such as higher than normal ripple on the output.

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TPS54418: output voltage swing with changing from external clock to RT/CLK resister