Part Analysis
| General Data | |
| Manufacturer (OEM) | RSY |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 2x Y caps, 1x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor SCK-0512 (5 Ohm @25°C) & Relay |
| Bridge Rectifier(s) |
2x
|
| APFC MOSFETs |
4x Infineon IPB50R140CP (550V, 15A @ 100°C, Rds(on): 0.14Ohm)
|
| APFC Boost Diode |
3x CREE C3D06060A (600V, 6A @ 152°C)
|
| Bulk Cap(s) |
2x Nippon Chemi-Con (420V, 560uFeach or 1320both, 2000h @ 105°C, KHE)
|
| Main Switchers |
4x Infineon IPB50R140CP (550V, 15A @ 100°C, Rds(on): 0.14Ohm)
|
| APFC Controller |
1x Texas Instrument UCC28180 &
1x Champion CM03X |
| Topology |
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 8x Infineon BSC014N04LS (40V, 100A @ 100°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 6x Infineon BSC0906NS (30V, 40A @ 100°C, Rds(on): 4.5mOhm) PWM Controller(s): 2x ANPEC APW7160A |
| Filtering Capacitors | Electrolytic: 2x Rubycon (3-6,000 @ 105°C, YXS), 6x Rubycon (6-10000 @ 105°C, ZLH), Polymer: 10x FPCAP , 28x United Chemi-Con ,13x Unicon |
| Supervisor IC | 1S313I-SAG |
| Fan Model | ZIC ZFB132512H (135mm, 12V, 0.45A, Double Ball Bearing Fan) |
| 5VSB/12VSB Circuit | |
| High Side Rectifier |
1x Shenzhen Foster Semiconductor FIR4N70BLG (700V, 2.5A @ 100°C, Rds(on):3mOhm)
|
| Low Side Rectifier |
[5VSB] 1x PFR20L100CT (20A, 100V), [12VSB] 1x MBR20150GCT (20A, 150V)
|
| Standby PWM Controller | INFSitronix IN2P070C |
I am always excited to see a new platform! This is by RSY, an OEM that used to work closely with Super Flower and later handled some of Seasonic’s PSU production. This platform is unique since it delivers two standby rails simultaneously, although not in the most efficient way. I will explain what I mean. To offer ATX12V and ATX12VO compatibility, the platform has two different configurations, one with the typical rails and 5VSB and one with only 12V and 12VSB. Eliminating the minor rails and 5VSB is easy since the only thing you have to do is use a cable that won’t use the corresponding pins, but having 12VSB is a pain since you have to implement a second rail in the PSU’s standby circuit. In this PSU, this is precisely the case; while on standby, if you get a multimeter and probe the sockets that power the ATX cables, you will find both 5VSB and 12VSB. Ideally, these rails should be generated only when needed (when the corresponding pins are used) and not continuously since this can affect standby (or Vampire) power. Of course, the easiest and trouble-free way is to have them operate in parallel continuously, but this way, a small amount of energy goes wasted. The same goes for the DC-DC converters of the minor rails, which ideally should be completely switched off once the 12VO cable is connected to the PSU.
The platform’s modern and clean design has enough space between parts for decent airflow. I also like that the AC socket is attached permanently to the PCB, so you don’t have to desolder any cables to get the PCB out of the casing. To minimize energy losses, the 12V FETs are installed on a vertical PCB, which is right beside the main transformer, while the DC-DC converters generating the minor rails are close by. Because of the small PCB size, several daughter boards are used to save space and optimize the design.
We find a full-bridge topology and an LLC resonant converter for lower energy losses on the primary side. All parts are of high quality, including caps by Chemi-Con and Rubycon. In addition to electrolytic caps, many polymer caps handle ripple filtering on the PSU’s secondary side.
The standby circuit generates the 5VSB and 12VSB rails by utilizing a single rectifier on its high side and two Schottky barrier diodes (SBRs) on its secondary side. I followed the PCB traces to identify these SBRs and the respective rectifying circuits.
The cooling fan is by Zeta Group, a brand I first noticed in Super Flower’s new PSUs. This doesn’t sound strange, given RSY’s close ties with Super Flower. According to SF, this new fan brand is pretty good, which could end Hong Hua’s dominance in the field. Well, we will see that in the future.
