Rosewill SilentNight 500 W Power Supply Review
Secondary Analysis
Contents
As one would expect in a high-efficiency power supply, the Rosewill SilentNight 500 W uses a synchronous design, where the Schottky rectifiers are replaced with MOSFETs. Also, the reviewed product uses a DC-DC design in its secondary. This means that the power supply is basically a +12 V unit, with the +5 V and +3.3 V outputs produced by two smaller power supplies connected to the main +12 V rail. Both designs are used to increase efficiency.
The +12 V output uses four IPP023N04N G MOSFETs, each one supporting up to 90 A at 100° C in continuous mode, or up to 400 A at 25° C in pulse mode, with a maximum RDS(on) of 2.3 mΩ.
Figure 14: The +12 V transistors
As explained, the +5 V and +3.3 V outputs are produced by two DC-DC converters, which are situated on the same printed circuit. Each converter is controlled by an NCP1587A integrated circuit. Each output uses two IPD040N03L G MOSFETs, each one supporting up to 90 A at 25° C or up to 76 A at 100° C in continuous mode and up to 400 A at 25° C in pulse mode, with a maximum RDS(on) of 4 mΩ.
Figure 15: The DC-DC converters
Figure 16: The DC-DC converters
The outputs of the power supply are monitored by the SF29601 integrated circuit. Since this is a proprietary chip from Super Flower, there is no datasheet publicly available for it, so we can’t comment on the protections it supports.
The secondary has solid and regular electrolytic capacitors, manufactured in Japan by Chemi-Con, and labeled at 105° C.
Figure 17: Capacitors
