A Look Inside

Like its bigger brother BW-B430JL is also made by Seasonic and in fact is a SeaSonic S12II 430W. With a quick look we immediately noticed that the internal design is similar to BW-B520JL and the two PSUs share many common components.


The first part of the transient filter is housed on a small PCB behind the AC receptacle and consists of one coil, one X and four Y caps. The second part, on the main PCB, has two coils, one MOV, one X and two Y caps. The rectifying bridge is a GBU806. The switchers of the APFC are two FDP18N50 MOSFETs. The reservoir/smoothing cap (390μF, 400V) is provided from Nippon Chemi-Con and is labeled at 105°C. As main switchers two FDP18N50 are used in push/pull topology. In the primary stage a vertical daughter-board holds the combo PFC/PWM controller, an Infineon ICE1CS02.


In the secondary stage we find only two toroidal chokes, so group regulation is present. The large choke is for 12V/5V output and the smaller one for 3.3V. Three SBR30A50CT handle the +12V output and 5V/3.3V are generated by a pair of STPS30L30C. Here lies the main difference between the BW-B520JL, at which the 5V rail is generated by a 40U45CT SBR that can handle more Amps. A negligible difference.
All caps in secondary stage are Japanese (Nippon) and labeled at 105°C. The protections IC, an HY-510N, is located in a vertical daughter-board. Similar to the BW-B520JL, the BW-B430JL does not feature OCP (Over Current Protection) since it has only one +12V rail and not two. So again the power specs label on the PSU (and on the packaging too) is wrong.


Soldering quality is decent. On the solder side of the main PCB there is an SBR10U45, responsible for the 5VSB rectification.


The fan is provided by ADDA (AD1212MB-A70GL).