Seasonic Platinum Fanless 520W Power Supply Review

No fan in this unit, but there are plenty of rows of heatsinks to help with cooling proficiency. The Seasonic Platinum Fanless 520W  is a synchronous unit with a DC-DC design in the secondary stage.

As we have discussed before, this means that the power supply is for all intents and purposes a 12V unit. The +3.3V and +5V outputs are produced by two smaller power supplies which are connected to the +12V  rail.

This is an ideal construction to maximise efficiency levels.

This supply has two X capacitors, four Y capacitors and ferrite coils. The primary stage of the unit uses a Hitachi 105c capacitor rated 330 µF x 420 V. The switching section uses four IPP50R250CP MOSFETS. Electrolytic capacitors in the secondary are also high grade Japanese capacitors from Rubycon and Chemi-Con.

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