TPS54620: Bode test of TPS54620 and TPS53353

Andy Liu3

Part Number: TPS54620
Other Parts Discussed in Thread: TPS53353

Hi team,

I want ask a question about TPS54620 and TPS53353, Regarding the content of the bode test and the spec definition, what are our product requirements?

For example, what are the requirements for the two materials of TPS54620 and TPS53353?

Please help me to answer my customer's question, thanks.

Best regards,

Andy Liu

over 4 years ago

0 Lishuang Zhao over 4 years ago

TI__Expert 7500 points

Hi Andy,

I can't understand what requirements does customer want to ask? Taking bode test as an example, do you want to get the bode test criteria? phase margin and bandwidth criteria?

Would you mind to talk more details?

Thanks,

Lishuang

0 Andy Liu3 over 4 years ago in reply to Lishuang Zhao

TI__Intellectual 2500 points

Hi Liushuang,

Yes, I think my customer want to know the bode test criteria of our products, for example TPS54620 and TPS53353.

0 Lishuang Zhao over 4 years ago in reply to Andy Liu3

TI__Expert 7500 points

Hi Andy,

For TPS54620, it is current mode control. As DS mentioned on page 19, for the crossover frequency fc, a good starting point is 1/10th of the switching frequency.

For TPS53353, DCAP mode control, normally the bandwidth needs to be limited below 1/3*fsw.

For both TPS54620 and TPS53353, recommend the phase margin to be higher than 40 degree/45 degree to get sufficient margin.

One app for reference: https://www.ti.com/lit/an/slvaf11/slvaf11.pdf

Thanks,

Lishuang

Power management

Power management forum

TPS54620: Bode test of TPS54620 and TPS53353