In Win Commander III 700 W Power Supply Review

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.

Figure 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).

Figure 17: One of the DC-DC converters

Figure 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.

Figure 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.

Figure 20: Capacitors