Topology and teardown
As expected, the tiny board is overloaded with components so that it can deliver the maximum power of the power supply. The design is clean, with no power or signal cables to impede airflow. RSY has made extensive use of daughter cards to utilize the height of the platform and the heatsinks are relatively small, but the 120mm fan supports them. The platform uses high-end capacitors and controllers, but the FETs on the primary and secondary sides are from lesser-known manufacturers. However, this does not necessarily mean that they are of mediocre quality.
On the primary side, a PFC converter is used for higher efficiency, followed by a full-bridge topology and an LLC resonant converter. On the secondary side, four FETs regulate the 12-volt rail, which feeds a series of DC-DC converters to generate the auxiliary rails. All electrolytic filter caps on the secondary side are from Rubycon. Chemi-Con, Unicon and another lesser known brand make the polymer caps, which are far more heat resistant than electrolytic capacitors, but have limited capacitance, which is especially critical for ATX v3.x power supplies that need to deliver 200% of their maximum power for short periods of time.
The fan is from the Zeta Group and has the model number ZFB122512M. It uses a double ball bearing, which is more tolerant of high operating temperatures and more noisy at lower speeds than fans with liquid bearings. Since the PCB is small, the thermal load is increased because the parts are close together, so in my opinion a DBB fan is preferable. Also, FDB fans are not suitable for frequent start and stop scenarios typical of semi-passive power supplies, as this type of fan is heavily stressed during the startup phase until the lubricant reaches the fan shaft. Finally, the black adhesive on some parts, including the Y-caps and coils, hinders the vibrations that are the main cause of coil whine. Yes, despite their name, caps can also produce “coil noise”!
Component overview
Finally, I have listed all the components used for interested readers:
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 & Relay |
Bridge Rectifier(s) |
1x
|
APFC MOSFETs |
2x WayOn WML28N60C4 (650V, 23A @ 25°C, Rds(on): 0.16Ohm)
|
APFC Boost Diode |
1x Maplesemi MSP08065G1 (650V, 27A @ 25°C)
|
Bulk Cap(s) |
2x Rubycon (420V, 270uF each or 540 both, 3000h @ 105°C, MXK)
|
Main Switchers |
4x Convert CS13N50FF (500V, 13A , Rds(on): 0.46Ohm)
|
APFC Controller | |
Topology |
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
Secondary side | |
12V MOSFETs | 4x HUAYI Microelectronics HYG020N04 (40V, 220A @ 25°C, Rds(on): 2.3mOhm) |
5V & 3.3V | DC-DC Converters: 4x FETs PWM Controller(s): 2x ANPEC APW7164 |
Filtering Capacitors | Electrolytic: 1x Rubycon (4-10,000 @ 105°C, YXJ), 3x Rubycon (3-6,000 @ 105°C, YXS), 1x Rubycon (6-10000 @ 105°C, ZLH), Polymer: 4x CAPS, 11x United Chemi-Con, 26x Unicon |
Supervisor IC | 1S313I-SAG |
Fan Model | ZIC ZFB122512M (120mm, 12V, 0.25A, Double Ball Bearing Fan) |
5VSB Circuit | |
High Side Rectifier |
1x Shenzhen Foster Semiconductor FIR4N70BLG (700V, 2.5A @ 100°C, Rds(on):3mOhm)
|
Standby PWM Controller | INFSitronix IN2P070C |
- 1 - Introduction, overview and technical data
- 2 - Unboxing, cables and protective circuits
- 3 - Teardown: Topology, components, workmanship
- 4 - Load Regulation, Ripple Suppression, Transient Resonse
- 5 - Hold-Up Time, Timings, Inrush-Current
- 6 - Average Efficiency and PF
- 7 - Fan curves and noise
- 8 - Summary and conclusion
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