Tuniq Potency 750 W Power Supply Review

Secondary Analysis

This power supply comes with six Schottky rectifiers attached on its secondary heatsink, plus a diode for rectifying the +5VSB output.

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 rail is produced using two ESAD83-004 (“E83-004”) Schottky rectifiers, each one capable of delivering up to 30 A (15 A per internal diode at 90° C, 0.55 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 514 W for the +12 V output.

The +5 V rail is produced using two SBR30U30CT Schottky rectifiers, each one capable of delivering up to 30 A (15 A per internal diode at 140° C, 0.54 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 rail is produced using another two SBR30U30CT Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for this output.

Of course our math is only an exercise, as the real maximum current will depend on the other components used.

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

This power supply uses a PS224 monitoring integrated circuit, which features the following protections: over voltage (OVP), under voltage (UVP) and over current (OVP). The over current protection circuit present inside this integrated circuit features four channels. The protection circuit also features an LM393 (dual voltage comparator) integrated circuit.

Figure 14: Monitoring circuit.

Electrolytic capacitors from the secondary are mostly from CEC, with some from Teapo and a few solid capacitors on the monitoring circuit printed circuit board.