SilverStone Strider Gold 650 W Power Supply Review

Primary Analysis

On this page, we will take an in-depth look at the primary stage of the SilverStone Strider Gold 650 W. For a better understanding, please read our “Anatomy of Switching Power Supplies” tutorial.

This power supply uses one GBU15L06 rectifying bridge, which is attached to the same heatsink as the active PFC and switching transistors. This bridge supports up to 15 A at 115° C. In theory, you would be able to pull up to 1,725 W from a 115 V power grid. Assuming 80% efficiency, the bridge would allow this unit to deliver up to 1,380 W without burning itself out (or 1,553 W at 90% efficiency). Of course, we are only talking about this particular component. The real limit will depend on all the components combined in this power supply.

Figure 11: Rectifying bridge

The active PFC circuit uses two IPP50R140CP MOSFETs, each one supporting up to 23 A at 25° C or 15 A at 100° C in continuous mode (note the difference temperature makes), or 56 A at 25° C in pulse mode. These transistors present a 140 mΩ maximum resistance when turned on, a characteristic called RDS(on). The lower the number the better, meaning that the transistor will waste less power, and the power supply will have a higher efficiency.

The active PFC circuit is controlled by a CM6502 integrated circuit.

Figure 12: Active PFC controller

The output of the active PFC circuit is filtered by a 470 μF x 420 V Japanese electrolytic capacitor, from Matsushita (Panasonic), labeled at 105° C.

Figure 13: Capacitor

In the switching section, two STP20NM50FD MOSFETs are employed using a resonant configuration. Each transistor supports up to 20 A at 25° C or 14 A at 100° C in continuous mode or up to 80 A at 25° C in pulse mode, with a maximum RDS(on) of 250 mΩ.

Figure 14: The switching transistors, the active PFC diode, and the active PFC transistors

The switching transistors are controlled by a CM6901 resonant controller, which is located on the solder side of the printed circuit board.

Figure 15: Resonant controller

Let’s now take a look at the secondary of this power supply.