Logisys PS350MA Power Supply Review
Secondary Analysis
Contents
The +12 V output uses one BYW51-200 rectifier (16 A, 8 A per internal diode at 156° C, 0.97 V maximum voltage drop), giving us a maximum theoretical current of 16 A or 192 W for this output. Please note that this rectifier is a “fast” model, not a “Schottky” one, meaning lower efficiency, which can be seen on the higher voltage drop offered.
The +5 V output uses one ESAD83-004 (“D83-004”) Schottky rectifier (30 A, 15 A per internal diode at 90° C, 0.55 V maximum voltage drop), giving us a maximum theoretical current of 30 A or 150 W for this output.
The +3.3 V output uses one S20C40C Schottky rectifier (20 A, 10 A per internal diode at 100° C, 0.70 V maximum voltage drop), giving us a maximum theoretical current of 20 A or 66 W for this output.
Notice how the +5 V output is “stronger” than the +12 V output, which is a typical scenario for power supplies projected more than 10 years ago. Nowadays, the most current/power is pulled from the +12 V output (because there is where the CPU and the video cards are connected to).
Figure 12: The +5 V, +12 V, and +3.3 V rectifiers
The PWM controller, already shown in Figure 11, also monitors the power supply outputs, providing over voltage (OVP) and under voltage (UVP) protections.
The electrolytic capacitors available in the secondary are from BH and labeled at 105° C.