Antec High Current Gamer M 620 W Power Supply Review

Power Distribution

The Antec High Current Gamer M 620 W uses a regular design in its secondary, 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 three SBR30A50CT Schottky rectifiers, each one supporting up to 30 A (15 A per internal diode at 110° C with a 0.55 V maximum voltage drop). From the six diodes available (two per rectifier pack), two are used for the direct rectification, while four are used for the “freewheeling” part of the rectification. This gives us a maximum theoretical current of 43 A or 514 W for the +12 V output.

The +5 V output uses one SBR40U45CT Schottky rectifier, which supports up to 40 A (20 A per internal diode at 110° C with a 0.52 V maximum voltage drop). This gives us a maximum theoretical current of 29 A or 143 W for the +5 V output.

The +3.3 V output uses one MBR30H30CTG, which supports up to 30 A (15 A per internal diode at 138° C with a 0.55 V maximum voltage drop). This gives us a maximum theoretical current of 21 A or 71 W for the +3.3 V output.

Note in Figures 13 and 14 how there is a metallic plate between the rectifiers and the heatsink in order to improve thermal dissipation.

Figure 13: One of the +12 V rectifiers, the +5 V rectifier, and the +3.3 V rectifier

Figure 14: The other two +12 V rectifiers

This power supply uses a PS223 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP), over current (OCP), and over temperature (OTP) protections. This chip offers two +12 V over current protection channels, but the manufacturer decided to use only one of them to make this unit have a single +12 V rail.

Figure 15: Monitoring circuit

The electrolytic capacitors that filter the +12 V output are also Japanese, from Chemi-Con, and are labeled at 105° C, as usual.