Cooler Master V550S with 3D Circuit Design Review

Name: Cooler Master V550S with 3D Circuit Design
Brand: Cooler Master

crmaris

on Sep 18th, 2013,

in Power Supplies.

Manufacturer: Cooler Master

Performance Rating, Performance per Dollar & Noise Rating »

Ripple Measurements

You will see the ripple levels we measured on the main rails of the V550S in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements Cooler Master V550S
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	11.7 mV	9.3 mV	17.4 mV	4.9 mV	Pass
40% Load	16.8 mV	11.6 mV	25.8 mV	6.0 mV	Pass
50% Load	19.6 mV	12.8 mV	19.2 mV	7.0 mV	Pass
60% Load	22.3 mV	14.7 mV	19.9 mV	7.9 mV	Pass
80% Load	28.6 mV	16.7 mV	23.6 mV	10.1 mV	Pass
100% Load	35.4 mV	21.0 mV	26.2 mV	12.8 mV	Pass
110% Load	38.9 mV	22.2 mV	27.1 mV	13.5 mV	Pass
Crossload 1	17.2 mV	10.2 mV	20.2 mV	6.2 mV	Pass
Crossload 2	34.5 mV	20.0 mV	23.8 mV	12.1 mV	Pass

Ripple suppression may not be among the best we have ever seen since it isn't at jaw-dropping levels, but it is still very good, with all rails registering ripple well below their corresponding limits. Also, ripple levels during the overload test (110% load) indicate that the unit can easily handle higher loads than its normal capacity.

Ripple at Full Load

The following oscilloscope screenshots show you the AC ripple and noise the main rails registered (+12V, 5V, 3.3V, and 5VSB). The bigger the fluctuations on the oscilloscope screen, the bigger the ripple/noise. For all measurements, we set 0.01 V/Div (each vertical division/box equals 0.01 V) as standard.