FSP Raider 650 W Power Supply Review

Secondary Analysis

The FSP Raider 650 W 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 two IPP057N06N MOSFETs, each supporting up to 45 A at 100° C in continuous mode or up to 180 A at 25° C in pulse mode, with a maximum RDS(on) of 5.7 mΩ.

Figure 15: The +12 V transistors

The DC-DC converters are located on the solder side of the printed circuit board and are controlled by another custom integrated circuit, FSP6601. Each converter uses a pair of STD95N3LLH6 MOSFETS, each supporting up to 80 A at 25° C or 61 A at 100° C in continuous mode, or up to 320 A at 25° C in pulse mode, with a maximum RDS(on) of 4.2 mΩ.

Figure 16: The DC-DC converters

Figure 17: Synchronous controller

The outputs of this power supply are monitored by a WT7579 integrated circuit. This chip supports over voltage (OVP), under voltage (UVP), overcurrent (OCP), and over temperature (OTP) protections. There are four +12 V over current protection channels, however, the manufacturer decided to use only one of them, making this unit a single +12 V rail design.

Figure 18: Monitoring circuit

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

Figure 19: Capacitors