LM3489: CISPR 25 recommendations

Vladimir Aparin

Part Number: LM3489

Hello.
my customer choose this device into new design.
They asking any recommendation for LM3489 how to make design suitable for CISPR 25 requirements.
Can TI provide anything useful here?

over 7 years ago

0 Frank De Stasi over 7 years ago

TI__Guru 72845 points

TI has several app notes regarding layout and EMI filters.

These should be of some help.

Also, once the customer is ready we can review the shcematic and layout.

0 Vladimir Aparin over 7 years ago in reply to Frank De Stasi

Expert 2610 points

Hello Frank,
where we can get these app notes?
I'll tell customer about this opportunity too.

0 Frank De Stasi over 7 years ago in reply to Vladimir Aparin

TI__Guru 72845 points

You can go to TI.com and search for emi or emi filter design and you
will find many technical papers.

0 Vladimir Aparin over 7 years ago in reply to Frank De Stasi

Expert 2610 points

We know about general recommendations, but it's not that we want.
Can you provide the recommendations especially for this controller?

0 Mathew Jacob1 over 7 years ago in reply to Vladimir Aparin

TI__Expert 5910 points

Vladimir,
I think following best layout practice is key. You can add a gate resistor for the fet to have some control and also plan on adding a snubber for the switch node. These extra components maybe just placeholder to help in case needed. Good Layout and using input filters would be the key strategy. I would also try to keep the ripple current low with a selection of the right inductor.

Regards,
Mathew

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LM3489: CISPR 25 recommendations