Antec VP450 Power Supply Review

Secondary Analysis

The Antec VP450 uses a regular design in its secondary, with Schottky rectifiers.

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. As an exercise, we can assume a duty cycle of 30 percent.

The +12 V output uses two MBR20100CT Schottky rectifiers (20 A, 10 A per internal diode at 120° C, 0.95 V maximum voltage drop). This gives us a maximum theoretical current of 29 A or 343 W for the +12 V output.

The +5 V output uses one HBR3045 Schottky rectifier (30 A, 15 A per internal diode at 150° C, 0.7 V maximum voltage drop). This gives us a maximum theoretical current of 21 A or 107 W for the +5 V output.

The +3.3 V output uses another HBR3045 Schottky rectifier. This gives us a maximum theoretical current of 21 A or 71 W for the +3.3 V output.

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

This power supply uses a WT7527 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP), and over current (OCP) protections. This chip offers two +12 V channels, correctly matching the number of +12 V rails advertised by the manufacturer.

Figure 14: Monitoring circuit

The electrolytic capacitors that filter the outputs are from CapXon and Teapo, and labeled at 105° C, as usual.