NZXT HALE82 850 W Power Supply Review

Secondary Analysis

The NZXT HALE82 850 W uses a DC-DC design on its secondary. This means that this unit is basically a +12 V power supply, with the +5 V and +3.3 V outputs generated by two small DC-DC converters installed on the main +12 V rail.

The +12 V output uses six SBR30A50CT Schottky rectifiers (30 A, 15 A per internal diode at 110° C, 0.55 V maximum voltage drop), which gives us a maximum theoretical current of 129 A or 1,543 W for this output, if all current/power were pulled from this output.

Figure 14: The +12 V rectifiers

The +5 V and +3.3 V converters are located on a single daughterboard attached to the main printed circuit board. See Figures 15 and 16.

Figure 15: The DC-DC converter

Figure 16: The DC-DC converter

The DC-DC converter is managed by an APW7159 PWM controller and uses seven IPD060N03L G MOSFETs, each one supporting up to 50 A at 100° C in continuous mode or 350 A at 25° C in pulse mode, with an RDS(on) of 6 mΩ.

This power supply uses a PS223 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP), and over current (OCP) protections. Even though this circuit features two +12 V OCP channels, the manufacturer decided to use only one of them, resulting in this unit having a single +12 V rail configuration.

Figure 17: Monitoring circuit

The electrolytic capacitors that filter the outputs are also Japanese, from Chemi-Con, and are labeled at 105° C, as usual.