Zalman ZM600-RS Power Supply Review

Secondary Analysis

This power supply has nine Schottky rectifiers attached to the secondary heatsink. Eight of them are from the model: SBL3040CT (30 A, 15 A per internal diode at 100° C, 0.55 V voltage drop). The ninth rectifier, an SBL1045CT (10 A, 5 A per internal diode at 95° C, 0.55 V voltage drop) is in charge of the +5VSB output. This configuration is identical to the one used on the 500 W model.

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 four of the rectifiers, giving us a maximum theoretical current of 86 A or 1,029 W.

The +5 V output is produced by two of the rectifiers, giving us a maximum theoretical current of 43 A or 214 W.

The +3.3 V output is produced by the last two rectifiers, giving us a maximum theoretical current of 43 A or 141 W.

All these numbers are theoretical. The real amount of current/power each output can deliver is limited by other components, especially by the coils used on each output.

Figure 13: +12 V, +5 V, +3.3 V and +5VSB rectifiers.

The outputs are monitored by a PS232 integrated circuit, which supports the following protections: over current (OCP), under voltage (UVP) and over voltage (OVP). Any other protection that this unit may have is implemented outside this integrated circuit.

Figure 14: Monitoring integrated circuit.

Electrolytic capacitors from the secondary are also from Teapo and labeled at 105° C.