Thermaltake TR2 RX 750 W Power Supply Review

Secondary Analysis

This power supply has eight 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%.

The +12 V output is produced by four SBR30A50CT Schottky rectifiers, each one supporting up to 30 A (15 A per internal diode at 110° C, 0.55 V maximum voltage drop), giving us a maximum theoretical current of 86 A or 1,029 W for the +12 V output.

The +5 V output is produced by two SBR30A40CT Schottky rectifiers, each one supporting up to 30 A (15 A per internal diode at 110° C, 0.50 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W.

The +3.3 V output is produced by another two SBR30A40CT Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W.

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

The outputs are monitored by a PS223 integrated circuit, which supports OCP (over current protection), OVP (over voltage protection), UVP (under voltage protection) and OTP (over temperature protection, not implemented on this power supply)

Figure 13: Monitoring integrated circuit.