SMPS EMI issues

I believe if you get the CE certification document, it will show what was required to pass the EMC tests.

Cheers

Not are the claims only good as a stand-alone unit, they're only applicable for the configuration tested (often full load into a resistor). We had serious problems with a wall wart that had alphabet soup ratings.

As with all supplies, you'll have to evaluate it in your application.

EMC claims of class B compliance are for the stand-alone unit, with no indication of a ground wire connection. This will have to be accounted for in most applications, where as a minimum, an output contact may be unavoidable. In small power units, input to output capacitance may be very low.

The claims for elimination of external filtering will apply to this stand-alone circuit.

RL

We use the BPS-2-14-00 and will be using the BPS-0.5-14-00 in some of our designs. These BPS supplies require an external X2 100nF cap to meet the EN55015 specs and even then they only just scrape a pass. However a new design is currently in production as far as I'm aware which should improve matters. I'll be testing the the BPS-0.5 in a new design soon. I'll report back here if it's of interest. regds. JB

Interesting. Are you two layer or more? Most of our designs are two layer, and crowded enough that we would have trouble getting much of a pour on either side.

Ours are 2-layer but we're fortunate in that there are no components on the bottom layer at all and none really that close on the top layer either apart from the X2 cap.

JB

Ok, thanks for the info.