TPS62913-IBB-EVM: Question about the spike on Vout

Part Number: TPS62913-IBB-EVM
Other Parts Discussed in Thread: TPS62913

Hi,

Compared with the Vout waveforms between TPS62913 buck(Figure 6-9 on D/S) and TPS62913IBB(Figure2-2 on EVM User's Guide),

a bigger spike noise is observed on IBB.

What does the difference come from?

Thanks,

over 2 years ago

+1 Steve Schnier over 2 years ago

TI__Expert 4645 points

Hello,

Thank you for the question. In an inverting buck boost configuration, there is a discontinuity where the output cap has to hold up the output voltage. This is the cause of the larger volgate spike. This application note may provide more information for you: https://www.ti.com/lit/an/snva856b/snva856b.pdf.

Power management

Power management forum

TPS62913-IBB-EVM: Question about the spike on Vout