The Be Quiet! Silent Wings fan is a special 135mm model designed for these units, branded BQT T13525-LF15. It is a fluid bearing model and the company are keen to point out that each of the blades is ‘tared’ to resolve any imbalancing. The company will add or remove weights when necessary. It produces up to 62.74 CFM (at a maximum of 1,500 rpm).
This is an FSP design, and is an ‘Active Clamp & Syncronous Rectifier’ topology configuration. Be Quiet claim this is ‘the best topology to create power supplies with an 80 PLUS Gold certification in watt ranges up to 700W, at reasonable costs’. They are using zero voltage and zero current switching technology (ZCS, ZVS).
This topology uses additional active components including a set of MOSFETS, capacitors and a newly developed IC on the primary side. A second IC controls the rectification on the DC or secondary side. They are using a large heatsink for MOSFET cooling.
FSP are using CapXon capacitors … a mixture of 85c and 105c ratings. The primary side capacitor is rated 330uF-420V.