LM5122: Spectrum analyzer

Alex Vasin

Part Number: LM5122

Can I specify the following expressions in a spectrum analyzer?

I need to add these two values together

LM5122_with_LISN_rev8.TSC

over 5 years ago

0 Garrett Roecker over 5 years ago

TI__Mastermind 21720 points

Hi Alex,

Thanks for reaching out with your equation and for considering the LM5122 in your design.

Is the goal of you simulation with a 5uH LISN network on the input?

Thanks,

Garrett

0 Alex Vasin over 5 years ago in reply to Garrett Roecker

Prodigy 155 points

Hi Garrett,

Yes, you’re right. This is the automotive equivalent of a network according to CISPR 25. And these expressions are necessary to separate the differential and common-mode interference of this converter.

0 Timothy Hegarty over 5 years ago in reply to Alex Vasin

TI__Guru 73072 points

Hi Alex,

The LISN model looks fine, but the modeling of the quasi-peak/average detector and the RBW filter of the EMI receiver is challenging. Take a look at this EMI article series for more detail:

http://www.how2power.com/other/EMI_Guide.php

Regards,

Tim

Power management

Power management forum

LM5122: Spectrum analyzer