Thermaltake TR2 700 W Power Supply Review

Secondary Analysis

The Thermaltake TR2 700 W 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 four SBR30A45CT Schottky rectifiers (30 A, 15 A per internal diode at 110° C, 0.50 V maximum voltage drop), which gives us a maximum theoretical current of 86 A or 1,029 W for this output.

The +5 V output uses two MBR3045 Schottky rectifiers (30 A, 15 A per internal diode at 130° C, 0.76 V maximum voltage drop), which gives us a maximum theoretical current of 43 A or 214 W for this output.

The +3.3 V output uses two SBR30U30CT Schottky rectifiers (30 A, 15 A per internal diode at 140° C, 0.54 V maximum voltage drop), which gives us a maximum theoretical current of 43 A or 141 W for this output.

Figure 14: The +12 V rectifiers, +5 V rectifiers, and +3.3 V rectifiers

This power supply uses a PS223 monitoring integrated circuit, which supports over voltage (OVP), under voltage (UVP), and over current (OCP) protections. This chip has two +12 V over current channels; however, the manufacturer decided to use only one of them, making this power supply have a single +12 V rail.

Figure 15: Monitoring circuit

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