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Secondary Analysis

As one would expect in a high-efficiency power supply, the FSP Aurum 92+ 650 W uses a synchronous design.

The +12 V output uses two IPP020N06N 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 only 2 mΩ.

FSP Aurum 92+ 650wFigure 16: The +12 V transistors

The +5 V output uses two IPD031N03L G MOSFETs, each one supporting up to 90 A at 100° C in continuous mode, or up to 400 A at 25° C in pulse mode, with a maximum RDS(on) of only 3.1 mΩ. These transistors are located on the solder side of the printed circuit board, using the power supply case as a heatsink. They are controlled by another custom integrated circuit, an FSP6601.

The +3.3 V output uses the same configuration as the +5 V output, as described above.

FSP Aurum 92+ 650wFigure 17: The +5 V and +3.3 V transistors

FSP Aurum 92+ 650wFigure 18: The synchronous controller

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

FSP Aurum 92+ 650wFigure 19: Monitoring circuit

The electrolytic capacitors from the secondary are also from Chemi-Con, and labeled at 105° C, as usual.

FSP Aurum 92+ 650wFigure 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.