Topology and teardown
The OEM is Channel Well Technology (CWT) and the platform’s codename is CSZ. The modern design uses analog controls for all circuits. We find a half-bridge topology and an LLC resonant converter on the primary side. On the secondary side, synchronous rectification is used with eight Infineon FETs for the 12-volt rail and two VRMs for the secondary rails.
The fan is made by Hong Hua and uses a fluid dynamic bearing, so it won’t have any problems in the long run as long as you don’t stress it heavily at high temperatures above 40 degrees Celsius. Finally, the quality of workmanship is high, and this also applies to the quality of the solder joints. On the solder side of the board, CWT has added copper plates to some traces for better conductivity and lower power losses under high load.
Now let’s take a look at the inside of the power supply, the components and PCBs:
Component overview
Finally, I have once again listed all the components used for the 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 Vishay LVB2560 (600V, 25A @ 105°C)
|
APFC MOSFETs |
3x Infineon IPA60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
APFC Boost Diode |
1x On Semiconductor FFSP1665A (650V, 16A @ 135°C)
|
Bulk Cap(s) | |
Main Switchers |
2x Infineon IPA60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm)
|
APFC Controller |
Champion CM6500UNX & CM03X
|
Resonant controller | Champion CU6901VAC |
Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
Secondary Side | – |
+12V MOSFETs | 8x Infineon BSC010N04LS (40V, 178A @ 100°C, Rds(on): 1mOhm) |
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 Nichicon (2-5,000h @ 105°C, HD), 2x Nichicon (4-10,000h @ 105°C, HE), 1x Rubycon (6-10,000h @ 105°C, ZLH), 1x Nippon Chemi-Con (4-10,000h @ 105°C, KY), 1x Nippon Chemi-Con (4-10,000h @ 105°C, KYA) Polymer: 21x FPCAP, 7x NIC |
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 protection 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 - Noise and fan
- 8 - ´Summary and conclusion
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