I've been testing this regulator (using the EVM with no modifications). My intent was to simply get an idea of the EMI profile so I could implement filtering input circuitry.
I noted that when I leave the EVM in DCM, with the output set to 5V (and Fsw set to 500kHz) I get different regulated output levels with different loads.
Under each load value (simple resistive loads), the EVM is powered up with the load present and the current and output voltage measured. I had the following results (once again, no changes to the jumper settings between these tests, and no circuit modifications applied to the EVM)
Load = 0.99A; Vout = 5.085V
Load = 1.9A; Vout = 5.118V
Load = 2.76A; Vout = 5.154V
All voltage measurements were made with the same DMM so they will be precise, regardless of the accuracy.
I measured the output voltage both with and without the current measurement DMM in circuit to ensure that the ammeter wasn't impacting the measurements.
The datasheet for the part indicates that it should have a 0.1% load regulation over the entire load range, and I've covered less than half of the range.
I read through the datasheet to see if I've missed an application setting to maintain the regulation to spec, but can't find that anything is amiss, plus this is the EVM with no changes.
Any recommendations to ensure that the part remains in spec?