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 GBU2510 (1000V, 25A @ 90°C)
|
| APFC MOSFETs |
2x Infineon IPW60R060P7 (650V, 30A @ 100°C, Rds(on): 0.060Ohm)
|
| APFC Boost Diode |
ROHM SCS310AH (650V, 10A @ 135°C)
|
| Bulk Cap(s) | |
| Main Switchers |
2x ROHM R6035VNX3 (600V, 35A @ 25°C, Rds(on): 0.119Ohm)
|
| 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 | 6x On-Semi NTMFS5C430NL (40V, 140A @ 100°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x DMT3004LPS (30V, 17A @ 70°C, Rds(on): 3.8mOhm) PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 8x 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: 31x 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 (Low Side) |
1x DMT10H009LPS (100V, 8A @ 70°C, Rds(on): 8mOhm)
|
| Standby PWM Controller |
Power Integrations TNY288PG
|
Great Wall makes this platform, using the MPS HR1200, which integrates a digital PFC controller and a half-bridge resonant controller into a single chip. The compact platform uses large enough heatsinks, and there is plenty of space on the secondary side, allowing good airflow; hence, the fan’s speed doesn’t need to get too high to remove heat from the PSU’s internals effectively. This means lower noise output. Another notable feature of this platform is that the circuits regulating the minor rails are not installed on a daughter board, as is typically the case, but are directly mounted on the main PCB and in direct contact with the fan’s airflow. This means better cooling and that the load on the minor rails won’t notably affect the fan’s speed, unlike in other PSU designs, especially those from CWT.
Great Wall used top-notch components on this platform, including Infineon and ROHM FETs and Japanese capacitors. These parts don’t come cheap, which explains the over $200 MSRP of the new RM1000x Shift model.
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 50A.
The APFC converter uses Infineon IPW60R060P7 FETs and a single ROHM SCS310AH boost diode. Rubycon and Nichicon manufacture the bulk capacitors. Their combined capacity is 860 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 ROHM R6035VNX3 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 electrically isolate the primary and secondary sides.
Six On-Semi NTMFS5C430NL FETs regulate the 12V rail. They are installed on the business (top) side of the PCB. The same type and number of FETs are installed in the 1200W model!
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
The unit’s MCU is a STMicroelectronics STM32C011F6P3.
The cooling fan is a Corsair NR140HP that uses a fluid-dynamic bearing.
