GlacialPower GP-AL650AA 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%. Of course the maximum current (and thus power) this line can really deliver will depend on other components, especially the coil.

+12 V rectification is done by two SBR40U60CT Schottky rectifiers, each one supporting up to 40 A (20 A per internal diode at 150º C), so we have a maximum theoretical current of 57 A (20 A x 2 / 0.70), which corresponds to 686 W.

The +5 V output is produced by two STPS30L30CT Schottky rectifiers, each one capable of handling up to 30 A (15 A per internal diode) at 140º C. This translates into a maximum theoretical current of 43 A or 214 W.

The other two Schottky rectifiers present are used to rectify the +3.3 V output, however they are not identical. For the direct rectification one STPS20L45CT is used (10 A per internal diode at 135º C), while for the “freewheel” diode one STPS30L30CT is used. For our calculations we have to consider only the diode used on the direct rectification, so the maximum theoretical current the +3.3 V output can deliver is 14 A or 47 W.

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Figure 10: +3.3V, +5V and +12 V rectifiers.

The outputs are monitored by a WT7525 integrated circuit (not shown in Figure 11), which supports the following protections: over current (OCP), under voltage (UVP) and over voltage (OVP). Any other protection that this unit may have is implemented outside this integrated circuit.

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Figure 11: Monitoring circuit.

The electrolytic capacitors from the secondary are also from OST, labeled at 105º C as usual.