Topology and teardown
CWT supplies the platform, which has a semi-digital structure, as both the primary side and parts of the secondary side are controlled by digital controllers. Only the secondary rails and the 5VSB line are controlled by analog controllers, otherwise the platform would be fully digital. The HX1000i uses a half-bridge topology on the primary side, while the more powerful models use a full-bridge topology, which is better suited to higher output powers. The heat sinks on the primary side are large enough for a modern, efficient platform, while the heat sinks on the secondary side are very small. CWT typically relies on compact secondary heat sinks for its high-end platforms to save production costs and board space.
The overall build quality is high, as you would expect from a power supply in this price range. All components are of high quality, including Infineon FETs and Japanese electrolytic capacitors from Chemi-Con and Rubycon. The fan is a Corsair NR140P with Fluid Dynamic bearing. Although CWT now manufactures its own fans, Corsair continues to emphasize even higher quality and performance. Compared to the HX1000i from 2022, the new model features a significantly revised design, even though many of the same components are used, including the digital controllers and the microcontroller (MCU).
| Corsair HX1000i Shift (2025) | Corsair HX1000i (2022) |
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The transient filter stage contains all the necessary components to block incoming and outgoing electromagnetic interference (EMI). It starts at the AC input and continues on the motherboard.
A metal oxide varistor (MOV) protects against voltage peaks, while a 15 Ohm NTC thermistor in conjunction with a relay serves as an inrush current limiter.
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Two Shindengen LL25XB60 rectifier bridges connected in parallel can process up to 50 amps together.
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The interleaved APFC converter uses two Infineon IPW60R099P6 FETs and two Infineon IDH08G65C6 boost diodes. The primary capacitors are from Nippon Chemi-Con and Rubycon, have a total capacitance of 890 µF, are rated for 2000 hours at 105 °C and are specified at 420 V, which is above the typical APFC bus voltage of around 380-400 V DC.
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Two digital controllers control the APFC, the primary switching stage and the 12 V FETs. This would make the platform completely digital if the secondary rails were also controlled via digital controllers. The central control element is a Microchip PIC32MM0064GPM036 microcontroller, which also handles the communication between the system and the power supply circuits.
On the primary side, two Infineon IPW60R099P6 FETs operate in a half-bridge topology, supplemented by an LLC resonant converter to increase efficiency.
The main transformer galvanically isolates the primary and secondary sides.
The 12 V rail is regulated via ten Infineon BSC014N04LS FETs.
Two DC-DC converters generate the secondary voltages. They use six UBIQ Semi QN3107M6N FETs, controlled by a UPI Semi uP3861P PWM controller.
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The electrolytic capacitors come from Chemi-Con and Rubycon, while FPCAP and Chemi-Con supply the polymer capacitors.
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The standby PWM controller is an On-Bright OB2365T.
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Directly on the modular connector panel are several polymer capacitors that form an additional ripple filter stage.
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The soldering quality is solid, although not the best CWT has shown so far. Some traces have been reinforced in order to be able to carry high currents with minimal losses.
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The fan used is a Corsair NR140P with Fluid Dynamic bearing and provides a balanced combination of quiet running and longevity.
Component overview
Finally, I have listed all the components used for interested readers:
| General Data | |
| Manufacturer (OEM) | CWT |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 6x Y caps, 3x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | NTC Thermistor SCK-20150 (15 Ohm) & Relay |
| Bridge Rectifier |
2x Shindengen LL25XB60 (600V, 25A @ 113°C)
|
| APFC MOSFETs |
2x Infineon IPW60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
| APFC Boost Diode |
2x Infineon IDH08G65C6 (650V, 8A @ 145°C)
|
| Bulk Cap(s) | |
| APFC Cut-Off |
Sync Power SPN5003 (reducing no-load consumption)
|
| Main Switchers |
2x Infineon IPW60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
| Digital Controllers | 2x Texas Instruments UCD3138A |
| MCU |
Microchip PIC32MM0064GPM036
|
| IC Driver | Silicon Labs Si8233BD |
| Topology | Primary side: Digital, Interleaved PFC, Half-Bridge & LLC Resonant Converter Secondary side: [12V] Synchronous Rectification & [Minor Rails] DC-DC converters |
| Secondary Side | |
| 12V MOSFETs | 10x Infineon BSC014N04LS (40V, 145A @ 100°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 6x UBIQ Semi QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) PWM Controller(s): UPI-Semi uP3861P |
| Filtering Capacitors | Electrolytic: 6x Nippon Chemi-Con (@ 105°C, W) 2x Rubycon (6-10,000h @ 105°C, ZLH) Rubycon (4-10,000h @ 105°C, YXF) Polymer: 7x Nippon Chemi-con, 26x FPCAP |
| Supervisor IC | Weltrend WT7502R (OVP, UVP, SCP, PG) |
| Fan Controller / Micro Controller | Microchip PIC32MM0064GPM036 |
| Fan Model | Corsair NR140P (140mm, 12V, 0.22A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Synchronous Rectification IC |
Leadtrend LD8926AA1
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| Standby PWM Controller |
On-Bright OB2365T
|
- 1 - Introduction, Prices and Technical Data
- 2 - Unboxing, Cables and iCUE
- 3 - Protection and EMI
- 4 - Teardown: Topology, components and craftmanship
- 5 - Load Regulation, Ripple Suppression, Transient Resonse
- 6 - Hold-Up Time, Timings, Inrush-Current
- 7 - Average Efficiency and PF
- 8 - Operating noise and fan
- 9 - Summary and conclusion
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