Huntkey Jumper 600B Power Supply Review

Secondary Analysis

The Huntkey Jumper 600B uses a regular design in its secondary, with Schottky rectifiers.

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 two M6060P Schottky rectifiers, each one supporting up to 60 A (30 A per internal diode at 95° C with a 0.64 V maximum voltage drop). This gives us a maximum theoretical current of 86 A or 1,029 W for the +12 V output.

The +5 V output uses two STPS30L45CT Schottky rectifiers, each one supporting up to 30 A (15 A per internal diode at 110° C with a 0.74 V maximum voltage drop). This gives us a maximum theoretical current of 43 A or 214 W for the +5 V output.

The +3.3 V output uses another two STPS30L45CT Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for the +3.3 V output.

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

This power supply uses a WT751002 monitoring integrated circuit, which supports only over voltage (OVP) and under voltage (UVP) protections. However, there are one LM393 and two LM339 voltage comparators to expand the functionalities of the WT751002 integrated circuit and create the over current protection.

Figure 15: Monitoring circuit

The electrolytic capacitors that filter the outputs are from Fcon and labeled at 105° C, as usual.