Topology and teardown
The CSZ platform from CWT is very popular these days for ATX v3.0-capable power supplies. Incidentally, Thermaltake’s GF3 models with up to 1200 W of power use the same platform, and Montech also uses it for its Titan Gold power supplies. The build quality is high, thanks to the good components and impeccable soldering quality. We find a half-bridge topology and an LLC resonant converter on the primary side. On the secondary side, a synchronous design is used to rectify the 12 V rail and a pair of DC-DC converters for the secondary rails.
Given the output power of the device, the heat sinks are small and limited to the primary side. There are no suitable heat sinks on the secondary side, so strong active cooling is required to dissipate the heat. All 12 V FETs are installed on a vertical board next to the main transformer to save space. The short distance the current travels from the main transformer to the 12 V FETs minimizes energy losses.
Component overview
Finally, I have listed all the components used for interested readers:
General Data | |
Manufacturer (OEM) | CWT |
Platform | CSZ |
PCB Type | Double-Sided |
Primary Side | |
Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
Inrush Protection | 1x NTC Thermistor SCK-207R0 (7 Ohm) & Relay |
Bridge Rectifier(s) |
2x WeEn WNB2560M (600V, 25A @ 127°C)
|
APFC MOSFETs |
3x Infineon IPA60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm) &
1x SyncPower SPN5003 (for reducing the no-load consumption) |
APFC Boost Diode |
1x Infineon IDH16G65C6 (650V, 16A @ 135°C)
|
Bulk Cap(s) |
1x Nippon Chemi-Con (420V, 1150uF, 2,000h @ 105°C, KHE)
|
Main Switchers |
2x Infineon IPA60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
APFC Controller |
Champion CM6500UNX
|
Resonant Controller | Champion CU6901VAC |
Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
Secondary side | |
12V MOSFETs | 10x Infineon BSC014N06NS (60V, 152A @ 100°C, Rds(on): 1.45mOhm) |
5V & 3.3V | DC-DC Converters: 2x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm) & 2x UBIQ QM3054M6 (30V, 61A @ 100°C, Rds(on): 4.8mOhm) PWM Controller(s): uPI-Semi uP3861P |
Filtering Capacitors | Electrolytic: 3x Nippon Chemi-Con (105°C, W), 1x Nippon Chemi-Con (2-5,000h @ 105°C, KZE), 1x Nichicon (5-6,000h @ 105°C, HV), 2x Nichicon (4-10,000h @ 105°C, HE), 1x Nippon Chemi-Con (4-10,000h @ 105°C, KYA)
Polymer: 16x FPCAP, 7x NIC, 1x Nippon Chemi-Con |
Supervisor IC | World Trend WT7502R |
Fan controller | Microchip PIC16F1503 |
Fan Model | Hong Hua HA13525H12SF-Z (135mm, 12V, 0.5A, Fluid Dynamic Bearing Fan) |
5VSB Circuit | |
Rectifier |
1x D10S45L SBR (45V, 10A)
|
Standby PWM Controller | On-Bright OB2365T |
- 1 - Introduction, technical data and test report
- 2 - Unboxing, cables and protective circuits
- 3 - Teardown: topology, components, processing
- 4 - Load Regulation, Ripple Suppression, Transient Resonse
- 5 - Hold-Up Time, Timings, Inrush-Current
- 6 - Average Efficiency and PF
- 7 - Noise and Fan Speed
- 8 - Summary and conclusion
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