Protection Features Evaluation

There is no need for such high OCP triggering points on the minor rails because nowadays, the minor are only utilized lightly.

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 or greater than the +3.3 V rail's output at all times, during the power-up and normal operation. For our first measurement, we turn the unit off and switch it back on without any load in any of the rails.



The +3.3 V rail is always lower than the other two, but the problem I noticed in the turn-on transient tests made another appearance here. In the PSU Off to Full Load scenario, there is a large drop at +12 V, which, as expected, affects the minor rails as well.

EMC Pre-Compliance Testing ñ 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.



EMI emissions stay below the corresponding limits.