PC Power & Cooling Silencer 750 Quad Power Supply Review

Secondary Analysis

This power supply has four Schottky rectifiers on its secondary.

The +12 V output is produced by two STPS6045CW Schottky rectifiers connected in parallel, each supporting up to 60 A at 150° C (30 A per internal diode). The maximum theoretical current the +12 V 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 (which in this case is made by two 30 A diodes in parallel). Just as an exercise, we can assume a typical duty cycle of 30%. This would give us a maximum theoretical current of 86 A or 1,029 W for the +12 V output. The maximum current this line can really deliver will depend on other components, in particular the coil used.

The +5 V output is produced by one STPS60L30CW Schottky rectifier, which supports up to 60 A at 130° C (30 A per internal diode). The maximum theoretical current the +5 V 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 (which in this case is made by one 30 A diode). Just as an exercise, we can assume a typical duty cycle of 30%. This would give us a maximum theoretical current of 43 A or 214 W for the +5 V output. The maximum current this line can really deliver will depend on other components, in particular the coil used.

And the +3.3 V output is produced by another STPS60L30CW Schottky rectifier, which supports up to 60 A at 130° C (30 A per internal diode). Following the same math the unit would be able to deliver up to 43 A or 141 W at +3.3 V.

Figure 12: +12 V rectifier, +5 V rectifier and +3.3 V rectifier. The other +12 V rectifier is on the other side of the heatsink.

This power supply uses an HY510N monitoring integrated circuit, which is in charge of the power supply protections, like OCP (over current protection). OCP was really activated, as we will talk about later.

Figure 13: HY510N monitoring integrated circuit.

This power supply uses a very small semiconductor thermal sensor, located under the main transformer secondary, see Figure 14. This sensor is used to control the fan speed according to the power supply internal temperature and to shut down the power supply in an overheating situation, if the power supply implements over temperature protection (OTP), which isn’t the case of Silencer 750 Quad.

Figure 14: Thermal sensor.

This power supply uses only Japanese electrolytic capacitors from Chemi-Con, which is great (Japanese capacitors are the best). The active PFC capacitor is rated at 85° C while the secondary capacitors are rated at 105° C.