Protection Features Evaluation

OCP at +12 V should be lower since the voltage drop is significant. On the other hand, the minor rails have adequately set OCP triggering points. The main problems here are the lack of over temperature protection and the lower than 16 ms power ok signal's hold-up time since the hold-up time is too short.

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 correctly 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 it is too high.



Some spurs go over the limits with the average EMI detector, and a single one exceeds the peak EMI detector's limits.