Thermaltake Smart 630 W Power Supply Review

Secondary Analysis

The Thermaltake Smart 630 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 two SBR60A60CT Schottky rectifiers (60 A, 30 A per internal diode at 100° C, 0.65 V maximum voltage drop). This gives us a maximum theoretical current of 86 A or 1,029 W for the +12 V output.

The +5 V output uses one STPS30L45CT Schottky rectifier (30 A, 15 A per internal diode at 135° C, 0.74 V maximum voltage drop). This gives us a maximum theoretical current of 21 A or 107 W for the +5 V output.

The +3.3 V output uses another two STPS30L45CT Schottky rectifiers. This gives us a maximum theoretical current of 43 A or 141 W for the +3.3 V output.  

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

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

Figure 15: Monitoring circuit

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