OCZ ZS Series 650 W Power Supply Review

Secondary Analysis

The OCZ ZS Series 650 W has eight Schottky rectifiers attached to the 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. As an exercise, we can assume a duty cycle of 30 percent.

The +12 V output uses four S30D45C Schottky rectifiers (30 A, 15 A per internal diode at 125° C, 0.70 V maximum voltage drop), giving us a maximum theoretical current of 86 A or 1,029 W for this output.

The +5 V output uses two PFR30L45CT Schottky rectifiers (30 A, 15 A per internal diode at 120° C, 0.52 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W for this output.

The +3.3 V output uses another two PFR30L45CT Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for this output.

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

This power supply uses an ST9S423 monitoring integrated circuit. Unfortunately, this chip isn’t listed at the manufacturer’s website, so we couldn’t confirm which protections this power supply really supports.

Figure 15: Monitoring circuit

The electrolytic capacitors available in the secondary are also Japanese, from Chemi-Con, and are labeled at 105° C.