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Secondary Analysis

As one would expect in a high-efficiency power supply, the In Win Commander III 700 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 IPP032N06N MOSFETs, each one supporting up to 120 A at 100° C in continuous mode, or up to 480 A at 25° C in pulse mode, with a maximum RDS(on) of 2.9 mΩ.

In Win Commander III 700wFigure 16: The +12 V transistors

As explained, the +5 V and +3.3 V outputs are produced by two DC-DC converters, each one located on an individual daughterboard. Each converter is controlled by an APW7160 integrated circuit and makes use of two STD60N3LH5 transistors (48 A at 25° C or 42.8 A at 100° C in continuous mode or 192 A at 25° C in pulse mode, 8 mΩ resistance) and two STD85N3LH5 transistors (80 A at 25° C or 55 A at 100° C in continuous mode or 320 A at 25° C in pulse mode, 5 mΩ resistance).

In Win Commander III 700wFigure 17: One of the DC-DC converters

In Win Commander III 700wFigure 18: One of the DC-DC converters

The outputs are monitored by a WT7579 integrated circuit, which supports over voltage (OVP), under voltage (UVP), over current (OCP), and over temperature (OTP) protections. There are four +12 V over current protection (OCP) channels, matching the number of +12 V rails advertised by the manufacturer.

In Win Commander III 700wFigure 19: Monitoring circuit

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.

In Win Commander III 700wFigure 20: Capacitors

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.