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I use an LMZ14201H in a certain circuit with the following parameters:
Iout: 600mA (max)
For some reason we have a peak of Radiated EMI at 70MHz approximately.
Are there any known issues or solutions?
We had in the past serious problems with conducted noises in low load conditions, due to the DCM/CCM transitions, we solved this problem, but the 70MHz radiated is hard to explain.
In reply to Emanuel Marinescu:
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In reply to joe baldwin:
In reply to Anston Lobo:
Thanks for the answer, I will try this of course and also the ground plane change as suggested by Joe.
Let me add that the situation we are facing is quite complicated. I had a lot to say about the test procedure which was made by the customer, which I think it was very wrong. The 461F allows reproducing the real installation conditions, but what they did is checked 2 units, first each one independently and somehow they passed, not brilliant results but below the limits. When connecting both of them the plots were as shown, and the over the limit peak at about 150MHz was only in horizontal antenna polarization, vertical passed. This clearly shows the noise is going out through the cables.
They connected the cables separately for each DUT, giving a total of 4-5m non shielded cable. Of course, only 1 pair of LISNs was used.
The problem is they won't agree to change anything, adding ferrite or using shielded cables.
They also claim the reputable lab insists the procedure is correct and above all they tested a competitor's product which passed the test with the same setup.
I wish the solution will be as simple as adding some capacitors or changing the ground plane, given the expected quantities I think both us and TI will be happy.
I will test the suggested solutions and keep you posted.
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