Cyonic AU-650x PSU Review

A Look Inside And Component Analysis

Parts Description

Before proceeding with this page, we strongly encourage you to a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss. Our main tools for disassembling PSUs are a Thermaltronics soldering and rework station, and a Hakko 808 desoldering gun.

Primary Side
Transient Filter6x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush ProtectionNTC Thermistor & Relay
Bridge Rectifier(s)1x GBU10V08 (800V, 10A @ 85 °C)
APFC MOSFETs2x Infineon IPD65R190C7 (700V, 8A @ 100 °C, 190 mohm)
APFC Boost Diode1x Infineon IDH08SG60C (600V, 8A @ 130 °C)
Hold-up Cap(s)1x Chemi-Con (420V, 560uF, 2000h @ 105 °C, KMR)
Main Switchers2x Infineon IPD50R280CE (550V, 8.2A @ 100 °C, 0.28 mohm)
APFC ControllerInfineon ICE3PCS01
Switching ControllerOn Semiconductor NCP1910
TopologyPrimary side: Half-Bridge & LLC Resonant Converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs / SBRs4x NXP PSMN2R6-40YS MOSFETs (40V, 100A @ 100 °C, 3.7 mohm)
2x SBR10U45S SBRs (45V, 10A @ 110 °C, 0.54V forward voltage drop @ 125 °C)
+12V Synchronous RectifierMonolithic Power Systems MP6922A
5V & 3.3VDC-DC Converters: 2x FDE15AJ
2x APW7164 PWM Controllers
Filtering CapacitorsElectrolytics: Nippon Chemi-Con (KY 7000h @ 105 °C, KZE 5000h @ 105 °C)
Polymers: Nippon Chemi-Con, EneSol, FPCAP
Supervisor ICHY-510N (OVP, UVP, SCP)
Fan ModelHong Hua HA1225M12F-Z (12V, 0.45A, Fluid Dynamic Bearing, 2050 RPM)
5VSB Circuit
Rectifier1x SBR10U45S
Standby PWM ControllerFairchild FSQ0165

The AU-650x uses a new Seasonic platform that we first encountered in EVGA's 650 GS and 550 GS units. It is classified below the Seasonic G series, offering lower performance (especially when it comes to ripple suppression). Obviously, the company wanted to enter the mid-range market, so it had to cut production costs as much as possible without giving up too much quality or reliability.

On the primary side, the APFC heat sink is small and doesn't host any components, while there isn't a heat sink at all for the secondary side's +12V FETs. Instead, they're installed on the PCB's solder side and are cooled by the power supply's chassis. Seasonic uses a half-bridge topology with an LLC resonant converter for increased efficiency in the primary side, along with a synchronous design in the secondary side and a couple of DC-DC converters for generating the minor rails. In general, this is a modern platform that appears to be very reliable due to its high-quality components and Japanese caps.

The first part of the EMI filter is shielded for greater protection against radiated emissions. It consists of two Y caps and a single X cap. The second part of the same filter on the main PCB consists of four Y caps, a single X cap, two CM chokes and an MOV (Metal Oxide Varistor) that provides protection against spikes coming from the mains network.

An NTC thermistor, along with an electromagnetic relay, provide protection against large inrush currents. The relay allows the thermistor to cool down quickly by isolating it once the start-up phase finishes.

The single bridge rectifier is bolted on a small, dedicated heat sink; its model number is GBU10V08.

The APFC FETs, along with a single boost diode, are installed on the solder side of the PCB. In total, two Infineon IPD65R190C7 FETs and an Infineon IDH08SG60C boost diode are used. The EVGA 650 GS employs stronger FETs with higher RDS(on) values, so we expect the Cyonic AU-650x to achieve slightly higher efficiency. The heat sink on top of the APFC's FETs and boost diode does help dissipate heat. However, the chassis plays a more active role in cooling those components down. The bulk cap is provided by Nippon Chemi-Con (420V, 560uF, 2000h @ 105 °C, KMR); it has enough capacity to provide a long hold-up time.

Two Infineon IPD50R280CE FETs, arranged into a half-bridge topology, are the unit's main switchers. An LLC resonant converter is also used for increased efficiency. It provides almost loss-less operation to the main switchers.

A daughterboard hosts the combo PFC/resonant controller (an NCP1910 IC). The same PCB also hosts the protections IC, an HY-510N. This is a basic supervisor circuit that enables OVP, UVP and SCP.

The +12V rail is regulated by four NXP PSMN2R6-40YS FETs and two SBR10U45S SBRs. The SBRs don't play an active role in regulation, as they would in a semi-synchronous design. In this case, the SBRs replace the FET's embedded diodes, limiting energy losses. Between the +12V FETs, we also found an MP6922A rectifier IC.

The APFC and main switchers, along with the +12V FETs and all SBRs installed on the mainboard's solder side, are cooled down by the chassis. In order to offer increased heat dissipation, a metal plate is installed at the bottom of the enclosure. Heat is transferred to it through thermal pads.

The small VRMs use an APW7164 PWM controller, along with a FDE15AJ FET.

The filtering caps in the secondary side are provided by Chemi-Con. Both polymer and electrolytic caps are used, with the latter rated at 105 °C. These should last a long time, even though KZE capacitors don't belong to Chemi-Con's top lines. Some Taiwanese or Chinese caps may have equal or even better specs on paper. However, you shouldn't always take those specifications seriously, since the quality of their electrolyte is inferior to what the Japanese caps use.

On the front side of the modular board, several polymer caps from Enesol and Chemi-Con provide extra ripple filtering to the outputs.

The standby PWM controller is an FSQ0165R IC and the 5VSB regulator is an SBR10U45S SBR, which is installed on the solder side of the mainboard.

Soldering quality is quite good overall, as usually is the case in Seasonic products.

The cooling fan is provided by Hong Hua and it uses a Fluid Dynamic Bearing (FDB). Its model number is HA1225M12F-Z (12V, 0.45A, 2050 RPM). Many other Seasonic PSUs employ the same exact fan, including the high-end Snow Silent 750W PSU. This fan is noisy at high speeds, but under light and moderate loads its control circuit keeps rotational speed and acoustic output low.