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## 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. Just as an exercise, we can assume a typical duty cycle of 30%.

The +12 V output is generated by two S30D150C Schottky rectifiers connected in parallel, each one capable of handling up to 30 A (15 A per internal diode at 100° C, 0.95 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 514 W for the +12 V output. These are the same components used in the eXtreme Power Plus 550 W, Spire Jewel Black 650 W, and Seventeam ST-500BAZ.

The +5 V output is generated by one SBL6040PT Schottky rectifier, which is capable of handling up to 60 A (30 A per internal diode at 100° C, 0.95 V voltage drop), giving us a maximum theoretical current of 43 A or 214 W. This is the same rectifier used in the eXtreme Power Plus 550 W, Spire Jewel Black 650 W, and Seventeam ST-500BAZ.

The +3.3 V output is generated by two SBL3040PT Schottky rectifiers connected in parallel, each one capable of  handling up to 30 A (15 A per internal diode at 95° C, 0.55 V voltage drop), which gives us a maximum theoretical current of 43 A or 141 W. These are the same components used in the eXtreme Power Plus 550 W, Spire Jewel Black 650 W, and Seventeam ST-500BAZ.

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

This power supply uses a WT7510 monitoring integrated circuit, which supports only over voltage (OVP) and under voltage (UVP) protections.

Figure 13: Monitoring circuit

Electrolytic capacitors from the secondary are also from Su’scon and labeled at 105° C.

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.