This power supply uses six Schottky rectifiers on its secondary.

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 output is produced by two MBR3060CT Schottky rectifiers connected in parallel, each one having a maximum current limit of 30 A (15 A per diode at 95º C, 0.78 V maximum voltage drop). This gives us a maximum theoretical current of 43 A or 514 W for the +12 V output.

The +5 V output is produced by two MBRP3045N Schottky rectifiers connected in parallel, each one having a maximum current limit of 30 A (15 A per diode at 100º C, 0.80 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W for this line.

The +3.3 V output is produced by another two MBRP3045N Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for the +3.3 V output.

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

This power supply uses a PS223 monitoring integrated circuit, which is in charge of the power supply protections, like OCP (over current protection). OCP was really activated, as we will talk about later. This IC also provides over voltage protection (OVP), under voltage protection (UVP) and over temperature protection (OTP, not implemented on this power supply), but not over power protection (OPP).

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Figure 14: Monitoring integrated circuit.

Electrolytic capacitors from the secondary are from CapXon and labeled at 105º C.