Cooler Master Elite Power 400 W Power Supply Review

Secondary Analysis

This power supply has four 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. Since this unit is based on the half-bridge topology, the duty cycle used is of 50%.

The +12 V output is produced by two HBR16200 Schottky rectifiers connected in parallel, each one supporting up to 16 A (8 A per internal diode at 150° C, 0.93 V maximum voltage drop – which is pretty high, meaning lower efficiency), giving us a maximum theoretical current of 32 A or 384 W for the +12 V output.

The +5 V output is produced by one SBL2045CT Schottky rectifier, which supports up to 20 A (10 A per internal diode at 95° C), giving us a maximum theoretical current of 20 A or 100 W for the +5 V output.

The +3.3 V output is produced by one MBR3045CT Schottky rectifier, which supports up to 30 A (15 A per internal diode at 130° C, maximum voltage drop of 0.82 V), giving us a maximum theoretical current of 30 A or 99 W for the +3.3 V output.

All these numbers are theoretical. The real amount of current/power each output can deliver is limited by other components, especially by the coils used on each output.

Figure 11: +3.3 V, +12 V and +5 V rectifiers.

The outputs are monitored by the FSP3528 integrated circuit shown in Figure 10. Since we couldn’t figure out which circuit this product was renamed from we can’t tell what protections it really supports.

The electrolytic capacitors from the secondary are also from Teapo.