Other Parts Discussed in Thread: LM62460RPHEVM
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Hello,
I am not sure about the resistor in parallel with the inductor EMI filter, but for the LM62460RPHEVM, the filter stability is addressed by the inclusion of the damping capacitor. Explanation of EMI filter stability is detailed in SNVA489 which is what the EMI filter was designed with.
Regards,
Jimmy
Hi Hale,
Take a look at the "Fundamentals of Power Electronics" textbook where there is a chapter dedicated to input filter instability. A series RL in parallel with the main filter inductor is one of the three main options for input filter damping, and this is sometimes simplified to simply a parallel resistor (although it does limit/clamp the total inductive impedance, thus compromising attenuation).
Regards,
Tim
Hi Tim,
Thank you pointing to this resource. In the simulation I've shown though the addition of the parallel resistor seems to only improve damping by up to .5dB. Am I missing something in this simulation setup?
Thanks,
Hale
Hi Hale,
1kΩ seems high for the damping resistance. As Jimmy mentioned, you may be better off using an electrolytic cap, 4x the ceramic input cap value.
See parts 10 and 15 here for detailed info: http://www.how2power.com/other/EMI_Guide.php.
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Tim