Akasa Essential Power 300 W Power Supply Review

Secondary Analysis

This power supply has five Schottky rectifiers on its 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%.

The +12 V output uses two MBR30L60CT Schottky rectifiers connected in parallel, each one supporting up to 30 A (15 A per internal diode at 120° C, 0.80 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 514 W for the +12 V output.

The +5 V output uses one MBR3045PT Schottky rectifier, which supports up to 30 A (15 A per internal diode at 105° C, 0.76 V maximum voltage drop), giving us a maximum theoretical current of 21 A or 107 W for the +5 V output.

The +3.3 V output uses two PFR30L45CT Schottky rectifiers connected in parallel, each one supporting up to 30 A (15 A per internal diode at 110° C, 0.52 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 141 W for the +3.3 V output.

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

The outputs are monitored by an HY-510N integrated circuit, which supports only over voltage (OVP) and under voltage (UVP) protections.

Figure 15: Monitoring circuit