OCZ StealthXStream 400 W Power Supply Review

Secondary Analysis

This power supply uses four Schottky rectifiers on its secondary.

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 produced by two SBR30A60CT Schottky rectifiers connected in parallel, each one having a maximum current limit of 30 A (15 A per diode at 110° C, 0.60 V maximum voltage drop). This gives us a maximum theoretical current of 43 A or 514 W for the +12 V output.

The +5 V output is produced by one STPS30L30CT Schottky rectifier, which has a maximum current limit of 30 A (15 A per diode at 140° C, 0.37 V voltage drop), giving us a maximum theoretical current of 21 A or 107 W for this line.

The +3.3 V output is produced by one STPS3045CW Schottky rectifier, which has a maximum current limit of 30 A (15 A per diode at 155° C, 0.57 V voltage drop) giving us a maximum theoretical current of 21 A or 71 W for the +3.3 V output.

Figure 13: One of the +12 V rectifiers and +3.3 V rectifier.

Figure 14: +5 V rectifier and the other +12 V rectifier.

The secondary is monitored by an SG6516DZ integrated circuit, which implements the following protections: overvoltage (OVP), undervoltage (UVP) and overcurrent (OCP).

Figure 15: Monitoring integrated circuit.

Electrolytic capacitors from the secondary are from different vendors: four of them are Japanese from Chemi-Con, but two are Chinese from Samxon and one is Taiwanese from OST.