Antec HCP-750 High Current Pro 750 W Review

Name: Antec HCP-750 High Current Pro 750 W
Brand: Antec

crmaris

on May 24th, 2011,

in Power Supplies.

Manufacturer: Antec

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of HCP-750. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V & 3.3V).

Ripple Measurements
Test	12 V	5 V	3.3 V	Pass/Fail
20% Load	8.4 mV	26.2 mV	14.8 mV	Pass
40% Load	38.2 mV	7.8 mV	8.4 mV	Pass
50% Load	35.8 mV	10.2 mV	10.6 mV	Pass
60% Load	32.6 mV	14.6 mV	12.6 mV	Pass
80% Load	29.8 mV	12.4 mV	13.2 mV	Pass
100% Load	32.2 mV	14.4 mV	16.2 mV	Pass
Crossload 1	9.8 mV	22.2 mV	16.2 mV	Pass
Crossload 2	32.6 mV	13.6 mV	13.2 mV	Pass

Ripple readings look very weird. With 20% load, ripple at 5V is very high but in the next test it drops under 8 mV! Also +12V has a sudden ripple increase with 40% load but afterwards and till 80% load, instead of going up, ripple actually decreases. Even with 100% load, ripple at +12V is smaller than with 40% load. We are pretty sure that the LLC resonant controller and the way it operates the main switches is responsible for these weird ripple readings. Nevertheless ripple/noise suppression is very good.

Ripple at Full Load

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard but sometimes we are forced to use 0.02 V/Div, meaning that the fluctuations will look smaller but actually this wont be the case.