Protection Features Evaluation

At close to 130%, the OCP triggering points on the +12V and 5V rails are ideally set. The same goes for the OPP's activation point. However, the 3.3V rail's OCP is set quite high, which doesn't affect 3.3V load regulation at all, and the 5VSB rail has a rather low OCP.

Because of the semi-passive operation, over temperature protection is set quite high. Finally, the power ok signal is accurate, but below 16 ms.

DC Power Sequencing

According to Intel's most recent Power Supply Design Guide (revision 1.4), the +12V and 5V rails must have voltages equal to or greater than the 3.3V rail's output during power-up and normal operation. For our first measurement, we turn the unit off and switch it back on without any load on any of the rails.



The 3.3V rail is always lower than the other two, but we noticed some weird oscillations at +12V during the second test.

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 can cause problems in other close-by devices if too high.



None of the spurs go over the corresponding limits, so everything is fine in this test.