Cooler Master Elite Power 460 W Power Supply Review
Secondary Analysis
Contents
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. These are the same rectifiers used on the 400 W model.
The +5 V output is produced by one STPS2045CT Schottky rectifier, which supports up to 20 A (10 A per internal diode at 155° C, 0.84 V maximum voltage drop), giving us a maximum theoretical current of 20 A or 100 W for the +5 V output. The 400 W version uses a rectifier with the same specs here.
The +3.3 V output is produced by one MBRP3045N Schottky rectifier, which supports up to 30 A (15 A per internal diode at 100° C, maximum voltage drop of 0.80 V), giving us a maximum theoretical current of 30 A or 99 W for the +3.3 V output. The 400 W version uses a rectifier with the same specs here.
Ouch! This unit has the same secondary as the 400 W model!
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. One thing we can say for sure is that it doesn’t support over current protection (OCP), since there is an unused series of holes on the printed circuit board reserved for an “OCP control board,” that is not present.
The electrolytic capacitors from the secondary are also from Teapo.