Lepa G1000-MA Semi Modular Power Supply Review

Our cross loading procedure is designed to rigorously test the stability of the main two rail combinations. We push the maximum rated current and wattage through the 12 volt rail(s), and then through the 3.3 and 5 volt rails combined, and see if the power supply is capable of delivering its specification for those. However, meeting the specification is not enough, the power supply must also maintain strong voltage regulation and noise/ripple to have “passed the cross load test. 

The cross load test is a “worst case scenario” for the two main power delivery rail mechanisms (12v and 3.3+5v) and so the power supply will always deliver slightly lower than realistic/expected results. However, this is not necessarily a realistic test and it is just a case of pushing a power supply’s rails right to their rated limits to see how well they can hold up.

12 Volt Cross Loading

Voltage regulation was exceptional given the high cross loading. All rails maintained within 1.5% of their rated voltages. A truly impressive showing from such a high wattage unit.

Ripple and noise was also strong given the magnitude of the 12 volt load and was less than 30mv.

5 and 3.3 Volt Cross Loading

Voltage regulation at 5 and 3.3 volt cross load was less than +-2.5% which is a very good showing. It is strange to see the 12 volt cross load do so much better but this is still a very strong showing by the G1000 from Lepa.

Noise and ripple on both the 3.3 volt and 5 volt rails were very strong. The 5v rail was less than 10mv and the 3.3v less than 20mv which is impressive.