A Look Inside

Before reading this page we strongly suggest to take a look at this article, which will help you understand the internal components of a PSU much better.


The OEM of the PSU is Seasonic and to be more specific the PSU is based on Seasonic's S12D 750W. The latter is a very good PSU so we expect nothing less from the Silencer 760W. Once we removed the casing we noticed the huge heatsinks that greatly help the fan do its job more efficiently and, most important, more quietly.


The fist part of the EMI/transient filtering stage is housed on a small PCB right behind the AC receptacle and is equipped with one coil, one X and two Y capacitors. The second part is located on the main PCB and consists of three coils, one X and two Y capacitors and an MOV. There is also a thermistor for inrush current limiting and an electromagnetic relay that bypasses the thermistor once the PSU starts and the main capacitors are fully charged.



The small heatsink located at the edge of the PCB cools two GBU806 bridge rectifiers. In the APFC stage the two coils indicate that interleaved PFC design is utilized. In an interleaved APFC topology two CCM (Constant Conduction Mode) APFC converters operate in parallel with 180^o phase shift. This results into minimized input/output current ripple, lower conduction losses that lead to increased efficiency, doubling of the effective switching frequency, lower power losses at light loads etc. The interleaved APFC stage uses four FQP13N50C mosfets, two for each CCM topology. The boost diodes are two STTH8S06. The filtering capacitors are provided from Nippon Chemi-Con. The smaller has 330μF capacitance and the bigger one 390μF. Both are rated at 105°C, 420V and belong to KMR series. As main switches two SPP24N60C3 are used. The combo PFC/PWM controller is a CM6802.


In the secondary side, passive design is used for the generation of +12V. Eight 40S45CT SBRs (Schottky Barrier Rectifiers) are up to the task. Afterwards the minor rails are generated from +12V with the help of two DC-DC converters. All filtering capacitors in the secondary, except for two Rubycons, are from Nippon Chemi-Con. All are rated at 105°C.


The protections integrated circuit is a PS223, which supports OVP, UVP, SCP, OCP (two +12V channels) and OTP. It is located on the solder side of the main PCB.


Soldering quality and workmanship on the main PCB are quite good.


The fan is provided from Adda. It's model number is AD0812UB-A71GL (3900 max RPM, 50 CFM, 41dbA).