Part Analysis
| General Data | |
| Manufacturer (OEM) | HKC |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 1x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor 5D-15 (5 Ohm @ 25°C) & Relay |
| Bridge Rectifier(s) |
2x Diodes GBU25KH (800V, 25A @with heatsink)
|
| APFC MOSFETs |
2x Lonten LSB65R070GT (650V, 26A @ 100°C, Rds(on): 0.099Ohm @ 150°C)
|
| APFC Boost Diode |
1x Global Power Tech. G3S06010J (600V, 8A @ 150°C)
|
| Bulk Cap(s) | |
| Main Switchers |
2x Lonten LSB65R099GT (650V, 26A @ 100°C, Rds(on): 0.099Ohm @ 150°C)
|
| APFC Controller | |
| Resonant Controller | Champion CM6901X |
| Digital MCU | Texas Instrument TPS54231 |
| IC Driver | Novesense NSi6602 |
| Topology |
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 6x R638A |
| 5V & 3.3V | DC-DC Converters: 4x Excelliance MOS EMB06N03A (30V, 50A @ 100°C, Rds(on): 6mOhm) PWM Controller(s): 1x ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 3x CapXon (3,000h @ 105°C, KF) 8x CapXon (2,000h @ 105°C, KF) 2x CapXon ( 2,000h @ 105°C, GF)Polymer: 39x CapXon |
| Supervisor IC | IN1S429I – SCG |
| Fan Model | Hong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
SB1045L (45V, 10A)
|
| Standby PWM Controller | PN8141 |
Despite the PCB’s small dimensions, the primary side is not overpopulated with parts, and the filtering capacitors on the secondary side are in clear view of the fan’s airflow. That said, some CapXon caps are close to the secondary side’s heatsinks so that they will be exposed to high operating temperatures under high loads. These are polymer caps, so they are much more tolerant to heat than electrolytic ones, but still, it is better to operate them at lower temperatures.
On the primary side, the PSU uses a half-bridge topology and an LLC resonant converter for lossless switching. On the secondary side, FETs handle the 12V rail and a pair of DC-DC converters the minor rails. All filtering caps are by CapXon, which is not among my top choices. For less expensive caps, I prefer Teapo and Elite. That said, CapXon products are not that bad anymore. Speaking of caps, I am considering implementing a capacitor testing procedure with destructive testing, which will help me spot the differences between various capacitor brands and models.
The PSU’s soldering quality is typical HKC, meaning of good quality. Some mediocre regions you will spot on the provided photos are because we had to desolder some stuff from the board with our not-so-gentle Hakko tool.
Something that I noticed while looking at the product’s page is that while TT provides a photo showing Chemi-Con caps on the secondary side, my sample came with CapXon caps, which are inferior to Chemi-Con ones. This is marketing at its full glory, I guess!
The caps of my sample. All by CapXon, on the secondary side!
