TPS57114C-Q1: Query on MLCC rating

Hello Rackshith,

Thanks for reaching out to us.

Please see my comments on your queries below.

Question 1:

Currently using 100nf MLCC capacitor at Boot pin,  Can I change 100nf 50V to 100nf 16V. Should I consider EMC here and let me what are the important parameter to consider while changing to 16V rated MLCC? --> Using a 100nF/16V Cboot seems ok. However, please use a X7R or X5R-grade dielectric. In addition, changing Cboot could potentially influence the EMC behavior and voltage across BOOT and PH pins, so you need to re-evaluate it over the entire Vin and temperature range.

Question 2:

Currently using 10uf,16V MLCC capacitor at output pin (PH), Can I change 10uf ,16V to 10uf ,6.3V. Should I consider EMC here and let me know will there be impact on compensation loop and transient response if ESR and Impedance value is slightly different with 10uf ,6.3V MLCC? --> It's also possible to change the output capacitor to 10uF/6.3V. However, it can impact the loop compensation, ripple voltage and transient response if the effective capacitance changes.

Best regards,

Excel

This is minimum capacitance value between Existing and Alternate part. where Alternate capacitance is within the acceptable range. Will this have any impact on compensation loop if I use alternate MLCC. Please refer the screenshot.

Hi Rackshith,

Thank for sharing the capacitor specs. The alternative parts doesn't change too much compared to the original components. However, I still recommend to verify it in actual application to ensure the performance is aligned with your expectation. 

By the way, I noticed that the AC derating of the capacitors were not considered. Is that correct?

Best regards,

Excel

Hi Rackshith,

Just a gentle reminder. 

Do you still have additional queries? If not, can you kindly close the thread by clicking the "Resolve" button.

Thank you.

Best regards,

Excel