Part Analysis
| General Data | |
| Manufacturer (OEM) | Seasonic |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor MF72 5D-20 (5 Ohm) & Relay |
| Bridge Rectifier(s) |
2x
|
| APFC MOSFETs |
2x InfineonIPA60R190P6 (600V, 12.7A @ 100°C, Rds(on): 0.190Ohm)
|
| APFC Boost Diode |
1x IDH08G65C6 (650V, 8A @ 145°C)
|
| Bulk Cap(s) |
2x Nippon Chemi-con (420V, 330uF each or 660uF combined, 2,000h @ 105°C, KMR)
|
| Main Switchers |
4x Infineon IPA60R230P6 (600V, 10.7A @ 100°C, Rds(on): 0.23Ohm)
|
| APFC Controller | Champion CM6500UNX |
| Resonant Controller | Champion CU6901VPA |
| Topology |
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 6x Nexperia PSMN1R4-40YLD (40V, 240A @ 25°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 6x Nexperia PSMN4R0-30YLD (30V, 95A @ 25°C, Rds(on): 4mOhm) PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 1x Nichicon (2-5,000h @ 105°C, HD, 4x Nippon Chemi-Con (5-6,000h @ 105°C, KZH), 3x Nippon Chemi-Con (2-5,000h @ 105°C, KZE) 4x Rubycon (3-6,000h @ 105°C, YXG), Polymer: 22x FPCAP |
| Supervisor IC | Weltrend WT7527RA (OCP, OVP, UVP, SCP, PG) |
| Fan Controller | Nuvoton M031 |
| Fan Model | Hong Hua HA13525H12F-Z (135mm, 12V, 0.5A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
1x
|
| Standby PWM Controller | Excelliance MOS EM85690 |
Seasonic provides this platform with a contemporary design. Its primary side has an APFC, a full bridge, and an LLC resonant converter. On the secondary side, a synchronous rectification scheme is used for 12V, and a pair of DC-DC converters generate the minor rails. The PCB is compact but not densely populated because of the lack of large heatsinks on the secondary side. This means that airflow is not restricted; hence, the fan doesn’t have to spin at high speeds to cool down the components. Please note that I have removed the bulk caps in the photos above to provide a better view of the internals.
The transient filtering stage has all the necessary parts to block incoming and outgoing EMI emissions. Typically, it starts at the AC receptacle and continues on the main PCB.
The NTC thermistor’s resistance looks low, but we will determine whether this is true with current inrush measurements. A bypass relay supports the NTC thermistor.
The two parallel bridge rectifiers are hard to identify without desoldering their heatsink (and them), so I skipped that part. Moreover, it is very easy to destroy these parts if you heat them for a prolonged period (to desolder them).
The APFC converter uses two Infineon FETs and a boost diode of the same brand. The bulk caps are by Chemi-con and offer a combined capacity of 660uF. They are rated for 2,000 h at 105 °C.
The APFC controller is a Champion CM6500UNX.
The four Infineon primary switching FETs are installed in a full-bridge topology, and an LLC resonant converter is used for higher efficiency.
The resonant controller is a Champion CU6901VPA.
The main transformer is next to the resonant tank and capacitive parts of the LLC resonant converter.
Four Nexperia PSMN1R4-40YLD FETs regulate the 12V rail. They are installed on the business side of the main PCB, and heat sinks above them keep operating temperatures under control.
Two DC-DC converters generate the minor rails.
Chemi-Con, Nichicon, and Rubycon provide the electrolytic filtering capacitors. The polymer caps are by FPCAP.
You can find more information about capacitor performance and other specs below:
The supervisor controller is a Weltrend WT7527RA.
The standby PWM controller is Excelliance MOS EM85690.
Several polymer and electrolytic caps at the face of the modular panel form an extra ripple-filtering layer.
Not much to see here. The soldering quality is good enough.
The cooling fan is a Hong Hua HA13525H12F-Z with a fluid dynamic bearing.
Crmaris will there be a Montech Century II test/review?
yes