Rosewill HIVE 650 W Power Supply Review

Secondary Analysis

In the secondary, the Rosewill HIVE 650 W uses the traditional configuration with Schottky rectifiers.

The maximum theoretical current each line can deliver is given by the formula I / (1 – D) where D is the duty cycle used and I is the maximum current supported by the rectifying diode. As an exercise, we can assume a duty cycle of 30 percent.

The +12 V output uses four S30D45C Schottky rectifiers (30 A, 15 A per internal diode at 125° C, 0.70 V maximum voltage drop), giving us a maximum theoretical current of 86 A or 1,029 W for this output.

The +5 V output uses two PFR30L45CT Schottky rectifiers (30 A, 15 A per internal diode at 120° C, 0.52 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W for this output.

The +3.3 V output uses another two PFR30L45CT Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for this output.

Figure 14: The +12 V, +5 V, and +3.3 V rectifiers

This power supply uses a PS223 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP), and over current (OCP) protections. There are two +12 V over current inputs available on this chip, but the manufacturer decided to use only one of them, making this power supply a single-rail unit.

Figure 15: Monitoring circuit

The electrolytic capacitors available in the secondary of the main printed circuit board are also from Teapo and are labeled at 105° C, while the electrolytic capacitors that are available on te modular cabling system are Japanese, from Chemi-Con. The OCZ ZS Series 650 W uses Japanese capacitors here.