Scythe Kamariki 4 550 W Power Supply Review

Secondary Analysis

Scythe Kamariki 4 550 W has six Schottky rectifiers on its secondary, all from the same model: ESAD83-004R. Each one is capable of handling up to 30 A (15 A per internal diode at 118° C, maximum voltage drop of 0.55 V).

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%.

Each main positive output is produced by two of those rectifiers connected in parallel, giving a maximum theoretical current of 43 A for each output, what translated into a maximum theoretical power of 514 W for the +12 V output, 214 W for the +5 V output and 141 W for the +3.3 V output. It is always good to remember that the real current/power limit for each output will depend on other factors, especially on the coils used.

Figure 12: Rectifiers.

This power supply uses a PS224 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP) and over current (OCP) protections.

Figure 13: Monitoring integrated circuit.

All the electrolytic capacitors from the secondary are Taiwanese from a company called TREC (Transcend Electrolytic Co) and labeled at 105° C, as usual. We think Scythe could use only Japanese caps.