OCZ StealthXStream 500 W Power Supply Review

Secondary Analysis

This power supply uses six 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 MBR3060CT Schottky rectifiers connected in parallel, each one having a maximum current limit of 30 A (15 A per diode at 105° C, 0.82 V maximum voltage drop). This gives us a maximum theoretical current of 43 A or 514 W for the +12 V output. These are exactly the same components used on Zalman ZM460-APS. SilverStone Strider ST50F uses different rectifiers here, but with exactly same limits. Interesting enough OCZ StealthXStream 400 W uses similar rectifiers on this output.

The +5 V output is produced by two MBR3045N Schottky rectifiers connected in parallel, each one with a maximum current limit of 30 A (15 A per diode at 100° C, 0.65 V voltage drop), giving us a maximum theoretical current of 43 A or 214 W for this line. These are exactly the same components used on Zalman ZM460-APS and SilverStone Strider ST50F. The 400 W model from this series uses only one 30 A rectifier here, thus having a lower current limit.

The +3.3 V output is produced by another two MBR3045N Schottky rectifiers, giving a maximum theoretical current of 43 A or 141 W for the +3.3 V output. These are the same rectifiers used on Zalman ZM460-APS and SilverStone Strider ST50F. The 400 W model from this series uses only one 30 A rectifier here, thus having a lower current limit.

Figure 13: +12 V rectifier, +5 V rectifier and +3.3 V rectifier.

This power supply uses a PS223 monitoring integrated circuit, which is in charge of the power supply protections, supporting OCP (over current protection), OVP (over voltage protection), UVP (under voltage protection) and OTP (over temperature protection, not implemented on this power supply).

Figure 14: Monitoring integrated circuit.

Electrolytic capacitors from the secondary are also from CapXon.

In summary, internally OCZ StealthXStream 500 W, Zalman ZM460-APS and SilverStone Strider ST50F are exactly the same power supply.