Difference between LTM8058 and ADuM 5020 in terms of EMI and efficiency

Hello,

in the evalkit of the LTM8058 (DC1988A) you will find an input filter for better EMI behaviour and some more diagrams on noise spectrum for output voltage. This info and following the layout guidelines in the datasheet will give you a pretty good design.

https://www.analog.com/media/en/technical-documentation/user-guides/DC1988AF.PDF

Depending on your final EMI requirements some more external filtering or changed components might be needed.

kind regards

Markus

Hello,

in the evalkit of the LTM8058 (DC1988A) you will find an input filter for better EMI behaviour and some more diagrams on noise spectrum for output voltage. This info and following the layout guidelines in the datasheet will give you a pretty good design.

https://www.analog.com/media/en/technical-documentation/user-guides/DC1988AF.PDF

Depending on your final EMI requirements some more external filtering or changed components might be needed.

kind regards

Markus

Hi Markus,

Thanks for reply. I examined this document. I want to ask why there is no CISPR22 info in LTM8058 data sheet? ADuM6020/28 has this information. Can I achieve the CISPR goals for LTM8058 with just using additional filtering components?

My second question why there is significant efficiency difference between two IC? 

Hello,

we cannot perform CISPR22 test on every demoboard we produce, that's the main reason. I'm pretty sure that you can achieve the required EMI limits with the LTM8058, a proper layout and good filter components.
LTM8058 and ADuM5020 feature complete different topology and different components for isolated power transfer.