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Secondary Analysis

The Corsair GS700 Bronze 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 five CEB6056 MOSFETS, each supporting up to 100 A at 25° C in continuous mode or up to 360 A at 25° C in pulse mode, with a maximum RDS(on) of 6.2 mΩ. These transistors are located on a small daughterboard.

Corsair GS700Figure 16: The +12 V transistors

The DC-DC converters are located on a separate printed circuit board. Both are managed by an APW7159 PWM controller, with each output using three AP72T03GH MOSFETs, each supporting up to 63 A at 25° C or 44 A at 100° C in continuous mode or up to 190 A at 25° C in pulse mode, with a maximum RDS(on) of 9 mΩ.

Corsair GS700Figure 17: The DC-DC converters

Corsair GS700Figure 18: The DC-DC converters

The outputs of this power supply are monitored by a WT7502 integrated circuit, which only supports over voltage (OVP) and under voltage (UVP) protections.

Corsair GS700Figure 19: Monitoring circuit

The electrolytic capacitors used in the secondary are from Samxon and labeled at 105° C, as usual. See Figure 20.

Corsair GS700Figure 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.