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Secondary Analysis

The FSP Aurum Xilenser 500FLD uses a synchronous design, meaning that the rectifiers were replaced with MOSFETs. Also, this power supply uses a DC-DC design, meaning that it is basically a +12 V power supply, with the +5 V and +3.3 V outputs being generated through two smaller switching power supplies connected to the +12 V rail. Both designs are used to increase efficiency.

The +12 V output uses four  IPD036N04L G MOSFETs, each supporting up to 90 A at 25° C or 87 A at 100° C in continuous mode or up to 400 A at 25° C in pulse mode, with a maximum RDS(on) of 3.6 mΩ. These transistors are located on the solder side of the printed circuit board, and the power supply case is used as a heatsink for them.

FSP Xilencer 500wFigure 17: The +12 V transistors

The DC-DC converters are located on a daughterboard and are controlled by an APW7159 integrated circuit. Each converter uses four IRLR8729PBF MOSFETs, each supporting up to 58 A at 25° C or 41 A at 100° C in continuous mode or up to 260 A at 25° C in pulse mode, with a maximum RDS(on) of 8.9 mΩ.

FSP Xilencer 500wFigure 18: The DC-DC converters

FSP Xilencer 500wFigure 19: The DC-DC converters

The outputs of this power supply are monitored by a GR8323 integrated circuit. This chip supports over voltage (OVP), under voltage (UVP), and overcurrent (OCP) protections. There are two +12 V over current protection channels, correctly matching the number of +12 V rails advertised by the manufacturer.

FSP Xilencer 500wFigure 20: Monitoring circuit

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

FSP Xilencer 500wFigure 21: 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.