Corsair GS800 Power Supply Review

Secondary Analysis

This power supply comes with eight Schottky rectifiers attached to its secondary heatsink.

The maximum theoretical current each line can deliver is given by the formula I / (1 – D) where D is the duty cycle used and I is the maximum current supported by the rectifying diode. Just as an exercise, we can assume a typical duty cycle of 30%.

The +12 V output is generated using six STPS3045CT Schottky rectifiers, three in charge of the direct rectification and three used in the "freewheeling" part of the rectification. Each rectifier supports up to 30 A (15 A per internal diode at 155° C, maximum voltage drop of 0.84 V), giving us a maximum theoretical current of 129 A or 1,543 W for the +12 V output.

The +5 V output is generated using one STPS3045CW Schottky rectifier, which supports up to 30 A (15 A per internal diode at 155° C, maximum voltage drop of 0.84 V), giving us a maximum theoretical current of 21 A or 107 W for the +5 V output.

The +3.3 V output is generated using another STPS3045CW Schottky rectifier, giving us a maximum theoretical current of 21 A or 71 W for the +3.3 V output.

Figure 14: +3.3 V, +12 V and +5 V rectifiers

The secondary is monitored by a PS229 integrated circuit. Unfortunately there is no technical information available for this component and, therefore, we can’t comment on the protections this power supply really supports.

Figure 15: Monitoring circuit

Some of the electrolytic capacitors of the secondary are Japanese, from Chemi-Con, and some are Taiwanese, from Teapo. Also, there is one solid capacitor.