As one would expect in a high-efficiency power supply, the Cougar GX-S 500 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 IRFB7446 MOSFETs, each one supporting up to 120 A at 25° C or 87 A at 100° C in continuous mode, or up to 492 A at 25° C in pulse mode, with a maximum RDS(on) of 3.3 mΩ.
As explained, the +5 V and +3.3 V outputs are produced by two DC-DC converters, each one located on a daughterboard soldered to the main printed circuit board. Each converter is controlled by an APW7073 integrated circuit and uses four STD85N3L MOSFETs, each one supporting up to 80 A at 25° C or 55 A at 100° C in continuous mode and up to 320 A at 25° C in pulse mode, with a maximum RDS(on) of 5 mΩ.
The outputs of the power supply are monitored by a PS223 integrated circuit, which supports over voltage (OVP), under voltage (UVP), and over current (OCP) protections. There are four OCP channels, one for +3.3 V, one for +5 V, and two for +12 V, correctly matching the number of +12 V rails advertised by the manufacturer.
This power supply uses a mix of solid and electrolytic capacitors in its secondary. The electrolytic capacitors are from Teapo and labeled at 105° C, as usual.