Thermaltake Toughpower 800 W (W0296RU) Power Supply Review
Secondary Analysis
Contents
Thermaltake Toughpower 800 W has two separated power supplies inside, one for the +12 V output and the other one for the +5 V output, with the +3.3 V output being generated from the +5 V output. There are a total of four Schottky rectifiers and five power MOSFETs. Each one of these MOSFETs is controlled by an individual IR1167ASPbF integrated circuit.
The +12 V output is produced by two IRFB3206PbF MOSFETs (maximum of 120 A at 100° C, maximum RDS(on) of only 3 mΩ, which is extremely low – which is terrific) and two SBR60A45CT Schottky rectifiers (60 A, 30 A per internal diode at 150° C, maximum voltage drop of 0.55 V each), each one installed in parallel with each MOSFET to prevent cross-conduction (this design is called “zero voltage switching” or “lossless switching”). Each MOSFET is controlled by an individual IR1167ASPbF integrated circuit.
The +5 V is produced by another two IRFB3206PbF MOSFETs (also controlled by individual IR1167ASPbF integrated circuits), using two SSC53L Schottky diodes to prevent cross-conduction (this design is called “zero voltage switching” or “lossless switching”). These diodes are soldered directly to the printed circuit board and thus not present on the secondary heatsink.
As explained, the +3.3 V output is produced from the +5 V output, using anothe
r IRFB3206PbF MOSFET (also controlled by an individual IR1167ASPbF integrated circuit) and one SBR4040CT Schottky rectifier (40 A, 20 A per internal diode at 110° C, 0.53 V maximum voltage drop).
The +5VSB output uses the fifth Schottky rectifier present on the secondary heatsink (another SBR4040CT).
This power supply unique design prevented us from calculating the maximum theoretical values for current and power, since we would need to explore this power supply a lot more in depth to come up with these numbers.
Figure 13: MOSFETs and rectifiers.
The secondary is monitored by a PS223H integrated circuit, which presents OVP (over voltage), UVP (under voltage), OCP (over current) and OTP (over temperature, not implemented on this power supply) protections.
Figure 14: Monitoring circuit.
All electrolytic capacitors from the secondary are Taiwanese from Teapo and labeled at 105° C, as usual. This unit has one single solid cap on the secondary.