Part Analysis
| General Data | |
| Manufacturer (OEM) | Great Wall |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | NTC Thermistor SCK205R0 (5 Ohm @ 25°C) & Relay |
| Bridge Rectifier(s) |
2x GBU1510 (1000V, 15A @ 40°C)
|
| APFC MOSFETs |
2x STMicroelectronics STW33N60DM2 (650V, 15.5A @ 100°C, Rds(on): 130mOhm)
|
| APFC Boost Diode |
1x ROHM SCS308AH (650V, 8A @ 135°C)
|
| Bulk Cap(s) | |
| Main Switchers |
2x STMicroelectronics STW33N60DM2 (650V, 15.5A @ 100°C, Rds(on): 130mOhm)
|
| PFC/LLC Combo Controller | MPS HR1280 |
| Topology | Primary side: Semi-Digital, APFC, Half-Bridge & LLC Resonant Converter Secondary side: [12V] Synchronous Rectification & [Minor Rails] DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 4x Toshiba TPH1R204PL (40V, 150A @ 25°C, Rds(on): 1.24mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x DMT3004LPS (30V, 17A @ 70°C, Rds(on): 3.8mOhm) PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 10x Nichicon (10,000h @ 105°C, HW(M)) 1x Nichicon (6,000 @ 105°C, HV(M)) 1x Rubycon (4-10,000 @ 105°C, YXF) 1x Rubycon (6-10,000 @ 105°C, ZLH) Polymer: 29x FPCAP |
| Supervisor IC | IN1S3151-SAG |
| IC Driver | MPS MP6924B |
| MCU | STMicroelectronics STM32C011F6P3 |
| Fan Model | Corsair NR140HP (140mm, 12V, 0.33A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier (High Side) |
1x DMT10H009LPS (100V, 8A @ 70°C, Rds(on): 8mOhm)
|
| #Standby PWM Controller |
Power Integrations TNY288PG
|
Great Wall manufactures this platform, built around the MPS HR1200 controller, which combines a digital PFC stage and a half-bridge resonant controller in one chip. The compact layout uses adequately sized heatsinks, and the secondary side is spacious enough to ensure good airflow, allowing the fan to run at lower speeds while still removing heat effectively—resulting in reduced noise. Another noteworthy aspect is that the minor-rail regulation circuits are mounted directly on the main PCB rather than on a daughterboard, placing them in the path of the fan’s airflow. This improves cooling and prevents minor rail load changes from noticeably increasing fan speed, unlike in many other designs, particularly those from CWT.
Great Wall used quality components on this platform, including STMicroelectronics and Toshiba FETs and Japanese capacitors. These parts don’t come cheap, which explains the stiff MSRP.
The transient filtering stage contains all the necessary components to block both incoming and outgoing EMI emissions. Typically, it starts at the AC receptacle and continues on the main PCB.
There is an MOV to protect from voltage surges and an NTC thermistor with a resistance of 5 ohms. Moreover, a bypass relay supports the NTC thermistor.
The parallel bridge rectifiers convert the incoming AC signal to a loosely regulated DC voltage. Combined, they can handle up to 20A.
The APFC converter uses two STMicroelectronics STW33N60DM2 FETs and a single ROHM SCS308AH boost diode. Nichicon manufactures the bulk capacitors. Their combined capacity is 720 μF, and both are rated for 2,000 hours at 105 °C. The voltage rating is 420V, which is well above the APFC’s DC bus voltage (approximately 380-400V DC).
Two STMicroelectronics STW33N60DM2 primary-switching FETs are used in a half-bridge topology, and an LLC resonant converter is employed for enhanced efficiency.
The MPS HR1280 is the combo PFC and LLC resonant controller. This controller combines PFC and LLC in a single chip, reducing BOM and board area while simplifying design compared to using two separate ICs (CM6502 + CM6901). It is also optimised for low no-load power (vampire power) to meet new and upcoming efficiency specifications. Its more notable feature over the corresponding duo of Champion controllers is that it is digitally controlled, making it much easier to tune it to the desired usage scenario.
The PSU’s main transformer. One of its main functions is to isolate the primary and secondary sides electrically.
Four Toshiba TPH1R204PL FETs regulate the 12V rail. They are installed on the business (top) side of the PCB.
Two DC-DC converters generate the minor rails. They use four DMT3004LPS FETs. The PWM controller is an Anpec APW7159C.
Rubycon and Nichicon provide the electrolytic capacitors. FPCAP makes the polymer capacitors.
You can find more information about capacitor performance and other specs below:
The standby PWM controller is a Power Integrations TNY288PG.
Many polymer caps on the modular panel’s face form an additional ripple-filtering layer.
The supervisor IC is an IN1S3151-SAG.
There are no parts installed on the PCB’s solder side. Under the bridge rectifiers, the PCB’s surface was overheated, which notably affected its finish.
The unit’s MCU is a STMicroelectronics STM32C011F6P3.
The cooling fan is a Corsair NR140HP that uses a fluid-dynamic bearing.
