Part Analysis
| General Data | |
| Manufacturer (OEM) | FSP |
| PCB Type | Double-Sided |
| –Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | NTC Thermistor & Relay |
| Bridge Rectifier(s) |
2x HY Electronic GBJ2508L (800V, 25A @ 100°C)
|
| APFC MOSFETs |
2x ROHM Semiconductor R6049YNX (600V, 22A @ 25°C, Rds(on): 84mOhm)
|
| APFC Boost Diode |
1x DSC08C065 (650V, 8A @ 25°C)
|
| Bulk Cap(s) |
2x Elite (420V, 470uF each or 940uF combined, 2000h @ 105°C, PL(M))
|
| Main Switchers |
2x STMicroelectronics STW35N60DM2 (600V, 17A @ 100°C, Rds(on): 0.11Ohm)
|
|
IC Driver |
Novosense NSI6602 |
| APFC Controller |
Champion CM6500UNX
|
| Resonant Controller | Champion CM6901X |
| Topology |
Primary side: APFC, Half-Bridge & LLC Resonant Converter
Secondary side: [12V] Synchronous Rectification & [Minor Rails] DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 6x Toshiba THPR8504PL (40V, 150A @ 25°C, Rds(on): 0.85mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x Nexperia PSMN3RO-30YLD (30V, 100A @ 25°C, Rds(on): 3.1mOhm) PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 1x Rubycon (6-10,000 @ 105°C, ZLH) 3x Elite (2,000 @ 105°C, EL) 2x Elite (2-5,000 @ 105°C, ED) 1x Elite (4-10,000 @ 105°C, EY) 1x Elite (3-6,000 @ 105°C, EV) Polymer: 19x Apaq, 8 Elite (CS), 9x Biostar |
| Supervisor IC | IN1S4241-SDG (OCP, OVP, UVP, SCP, PG) |
| Fan Controller | Grenergy GR8031 |
| Fan Model | BQ QF2-12025-HS (120mm, 12V, 0.30A, Rifle Bearing Fan) |
| 5VSB Circuit | |
| Synchronous Rectification Driver |
Leadtrend LD8926AA13 Synchronous Rectification IC
|
The OEM is FSP, which has a good cooperation with be quiet! all these years. The platform will most likely be used only by be quiet! products, meaning that you won’t find it under another brand’s label. The relatively small PCB has ample space between parts for good airflow, so the fan doesn’t have to spin at high speeds to remove the heat from the internals. The heatsinks are also large enough to help remove heat without requiring increased airflow. The overall build quality is high, and FSP used good but not overly expensive parts, including Elite caps, to keep production costs in control.
On the primary side, we find the typical staff: APFC converter, a half-bridge topology, and an LLC resonant converter for the primary and the 12V FETs. On the secondary side, a synchronous rectification scheme and a pair of VRMs are used for the generation of the minor rails. Moreover, the fan utilizes a dedicated can controller, which enables it to spin at very low speeds, thereby keeping the noise output low.
The transient filtering stage contains all the necessary components to block both incoming and outgoing EMI emissions. Typically, it starts at the AC receptacle and continues on the main PCB.
There is an MOV to protect from voltage surges and an NTC thermistor. Moreover, a bypass relay supports the NTC thermistor.
The two GBJ2508L parallel bridge rectifiers can handle up to 50A together, which is overkill for a 1000W PSU.
The APFC converter uses two ROHM Semiconductor R6049YNX FETs and one DSC08C065 boost diode. Elite manufactures the bulk capacitors. Their combined capacity is 940 μF, and they are rated for 2,000 hours at 105 °C. Their voltage rating is high enough at 420V. Remember the APFC’s DC bus voltage is approximately 380V DC.
The APFC controller is a Champion CM6500UNX.
The two STMicroelectronics STW35N60DM2 primary switching FETs are installed in a half-bridge topology, and an LLC resonant converter is used to achieve higher efficiency.
The LLC resonant controller is a Champion CM6901X.
The PSU’s main transformer. One of its main functions is to electrically isolate the primary and secondary sides.
Six Toshiba THPR8504PL FETs regulate the 12V rail. They are installed on the solder (rear) side of the main PCB.
Two DC-DC converters generate the minor rails. They use four Nexperia PSMN3RO-30YLD FETs. The PWM controller is an ANPEC APW7159C.
Besides a single Rubycon, all other electrolytic caps are by Elite. The polymer caps are by Apaq, Elite, and Biostar.
You can find more information about capacitor performance and other specs below:
The standby PWM controller is a LeadTrend LD8926AA13.
Several polymer caps at the face of the modular panel form an extra ripple-filtering layer.
The soldering quality is generally good.
The supervisor IC is an IN1S4241-SDG.
The cooling fan is a BQ QF2-12025-HS, utilizing a rifle bearing. The dedicated controller enables easy adjustment of the fan’s speed profile, allowing it also to spin at low speeds.
The PowerZone has relatively loud transformer noise, even in standby. You can hear it from the next room. Otherwise, it’s electrically quiet — no coil whine or other weird stuff — but the base hum is quite loud. What about this one?
Can you recommend a power supply that’s completely silent, even in standby? I’ve tested a few and ended up sticking with the PowerZone 2 because it’s a good all-rounder and gets a lot of things right. But that low hum or faint squeal drives me crazy. Every morning I wake up thinking, “Damn, I forgot to switch off the power strip again before going to bed