Protection Features Evaluation

OCP at +12 V is set reasonably, and the same goes for OPP. However, not so for the minor rails, as OCP for those is set way too high. There is no need for such high power levels at 5 V and 3.3 V because today's components only lightly utilize these rails.

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. For our first measurement, we turn the unit off and switch it back on without a load on any of the rails.



The 3.3 V rail always sits below the other two rails.

EMC Pre-Compliance Testing - Average and Quasi-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.



We have some high spikes that exceed the limits with the AVG EMI detector. There is also a single high spike with the QP detector, but it doesn't go over the limit.