Antec High Current Pro 750 W Power Supply Review

Power Distribution

As one would expect in a high-efficiency power supply, the Antec High Current Pro 750 W uses a synchronous design, where the Schottky rectifiers are replaced with MOSFETs. Also, the reviewed product uses a DC-DC design in its secondary. This means that the power supply is basically a +12 V unit, with the +5 V and +3.3 V outputs produced by two smaller power supplies connected to the main +12 V rail. Both designs are used to increase efficiency.

The +12 V output uses four IPD031N06L3 G MOSFETs, each one supporting up to 100 A at 100° C in continuous mode, or up to 400 A at 25° C in pulse mode, with a maximum RDS(on) of 3.1 mΩ. These transistors are located on the solder side of the printed circuit board and use the power supply case as their heatsink.

Figure 19: The +12 V transistors

As explained, the +5 V and +3.3 V outputs are produced by two DC-DC converters, which are situated on a single printed circuit board located in the secondary section of the power supply. The converters are controlled by an APW7159 integrated circuit. The +3.3 V converter uses four AOD4132 MOSFETS, while the +5 V converter uses another three. Each transistor supports up to 85 A at 25° C or 63 A at 100° C in continuous mode and up to 200 A at 25° C in pulse mode, with a maximum RDS(on) of 6 mΩ.

Figure 20: The DC-DC converters

Figure 21: The DC-DC converters

The outputs of the power supply are monitored by a DWA103N integrated circuit. Unfortunately, the datasheet for this chip is not available.

Figure 22: Mon
itoring circuit

The electrolytic capacitors available in the secondary are also Japanese, from Chemi-Con and Rubycon, and labeled at 105° C, as usual. As you can see in Figure 23, several solid capacitors are also used.

Figure 23: Capacitors