Protection Features Evaluation

The OCP triggering points are adequately set on all rails but 5VSB, where it is set way too high. The unit's OPP is also set to a proper level, and over temperature protection exists and shuts down the unit if things get way too hot on the secondary side.

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 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 it is too high.


There are some spurs with the average EMI detector, but everything is fine with the Peak detector.