Thermaltake TR2 700 W Power Supply Review

Primary Analysis

On this page we will take an in-depth look at the primary stage of the Thermaltake TR2 700 W. For a better understanding, please read our “Anatomy of Switching Power Supplies” tutorial.

This power supply uses two GBU606 rectifying bridges, which are attached to the same heatsink as the switching transistors. Each bridge supports up to 6 A at 100° C, so in theory, you would be able to pull up to 1,380 W from a 115 V power grid. Assuming 80% efficiency, the bridges would allow this unit to deliver up to 1,104 W without burning themselves out. Of course, we are only talking about these particular components. The real limit will depend on all the components combined in this power supply.

Figure 10: Rectifying bridges

The active PFC circuit uses two FCPF21N60CT MOSFETs, each one supporting up to 20 A at 25° C or 12.5 A at 100° C in continuous mode (note the difference temperature makes), or 60 A at 25° C in pulse mode. These transistors present a 150 mΩ resistance when turned on, a characteristic called RDS(on). The lower the number is, the better, meaning that the transistor will waste less power, and the power supply will have a higher efficiency.

Figure 11: The active PFC transistors and diode

The output of the active PFC circuit is filtered by a 470 µF x 420 V Japanese electrolytic capacitor, from Matsushita (Panasonic), labeled at 105° C.

In the switching section, two IPA60R190C6 MOSFETs are employed using the traditional two-transistor forward configuration. Each transistor supports up to 20.2 A at 25° C or 12.8 A at 100° C in continuous mode, or 59 A at 25° C in pulse mode, with a 190 mΩ RDS(on).

Figure 12: The switching transistors

The primary is controlled by the famous CM6800 PWM/active PFC combo controller.

Figure 13: Active PFC/PWM controller

Let’s now take a look at the secondary of this power supply.