Protection Features Evaluation

OCP at +12 V and OPP are set relatively high, but I didn't notice load regulation or ripple problems. The minor rails have triggering points close to 140%. It would be better if the 3.3 V rail triggering point would be 130% since it is only lightly used. Finally, the 5VSB rail is very strong, exceeding 7.2 A. I would feel better with a lower set OCP there.

DC Power Sequencing

According to Intel's most recent Power Supply Design Guide (revision 1.4), the +12 V and +5 V rails must have voltages equal to or greater than the +3.3 V rail's output at all times. We turn the unit off for our first measurement and switch it back on without a load on any of the rails.



The 3.3 V rail is always lower than the other two rails.

EMC Pre-Compliance Testing - Average and Peak EMI Detector Results

Electromagnetic Compatibility (EMC) is the ability of a device to operate properly in its environment without disrupting the proper operation of other close-by devices.

Electromagnetic Interference (EMI) stands for the electromagnetic energy a device emits, and it can cause problems in other close-by devices if too high.


Three spurs go over the limits with the average EMI detector, but everything is fine with the peak EMI detector.