A Look Inside

be quiet!'s Straight Power E9 is based on an FSP OEM design. The first hint for a high-quality power supply you can get from the transient filtering stage.

On the primary side you find two rectifier. The FSP6600 controls the PFC Booster and the active Clamp/Reset converter. This PSU has an active Clamp/Reset topology according to the following principle: Link
This is an exotic topology; this PSU achieves Gold standard with a normal Ultrafast Diode at the APFC stage.

The APFC Capacitor with 390uF at 420V and 85°C is from Teapo. The PFC Booster uses an STTH8R06 Ultrafast recovery diode and 2 IPB60R165 (650V, 0.165Ohm) Mosfets. This is ok for a PSU in this price range; SiC Diodes are still quite expensive. For rectifying the secondary side Mosfets are used. This PSU does not use the famous DC-DC approach; it generates the 5 and 3.3V directly from the main transformer. This has the disadvantage that only 1 control parameter is available for 3 independent Voltages. This brings disadvantages in transient load and crossload scenarios concerning the voltage stability. The output filter capacitors are from Teapo.

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Page 1 - Presentation

Page 2 - Photo Gallery

Page 3 - Delivery / Specs

Page 4 - A Look Inside

Page 5 - Input/Output Power and Efficiency

Page 6 - Result Analysis and Discussion

Page 7 - Conclusion