Page 3 - Physical Look - Inside
We now take an internal look at the SilverStone Extreme 650Rz Gold 650W power supply. Opening the unit may void the three-year warranty, as there are notable seals over three of the screws securing the enclosure. As such, users are strongly discouraged from opening the power supply, as there are no user-serviceable components inside. For analysis purposes, however, our review unit was disassembled. The process was somewhat cumbersome, requiring the removal of twelve screws in total.
The transient electromagnetic interference filter stage is located immediately behind the alternating current receptacle. It consists of two X-capacitors, four Y-capacitors, a metal oxide varistor, and a common-mode choke. The Y-capacitors are blue ceramic units, while the X-capacitors are rectangular film capacitors in black and white casings. A basic input filter typically includes one X-capacitor and two Y-capacitors, so the SilverStone Extreme 650Rz Gold 650W exceeds the recommended minimum by doubling the number of suppression capacitors.
The primary stage begins with a bridge rectifier, which converts the alternating current input into pulsating direct current. The rectifier is mounted beneath the main primary-side heatsink and could not be visually identified. Based on its package and thermal coupling, it is a discrete heatsink-mounted component capable of handling high input currents typical of a 650W SFX power supply. Bridge rectifiers in this configuration are generally rated for 15 to 25A at 100 to 115V to provide sufficient margin for continuous operation.
Following rectification, a Nichicon bulk electrolytic capacitor rated at 470µF x 420V smooths the high-voltage DC and provides energy storage for the primary switching circuitry. Its 105c rating improves long-term reliability under elevated operating conditions. Also on the primary side is the Si-Trend SI8016HSP8 PWM controller. It drives the main MOSFET and manages primary-side switching while providing multiple protections, including undervoltage, overvoltage, overcurrent, overload, and thermal protection.
The primary switching is handled by a Sanrise SRC60R078BS, a 600V N-channel super-junction MOSFET with an RDS(on) resistance of 78mΩ. The MOSFET can handle a continuous drain current of 42A at 25c. Another component marked HX1D0606 was observed near the MOSFET and Schottky diode.
On the secondary stage, several capacitors mounted on the printed circuit board are rated at 470µF x 16V, and are used to filter and smooth the +12V output. The +12V rail is regulated by a CU6901V SLS resonant controller from Champion Microelectronics. Infineon BSC014N04LSI MOSFETs are used for high-current synchronous rectification. These MOSFETs support a 40V drain-source voltage, up to 195A continuous drain current at 25c, and have very low RDS(on) resistance of 1.2 to 1.45mΩ, helping to reduce conduction losses. Thermal pads on the rear of the printed circuit board assist with heat dissipation from these components.
The 3.3V and 5V rails are generated through dual-channel synchronous buck conversion from the main 12V rail, handled by an uPI Group uP3861P controller. Components marked 0906NS, corresponding to the Infineon BSC0906NS, are N-channel power MOSFETs used in these buck converter stages. A total of four of these MOSFETs are present. Its rated continuous drain current is 40A at 10V, 100c. It has an RDS(on) value of 4.5mΩ in these conditions.
Additionally, the power supply includes a secondary printed circuit board mounted on the opposite side of the fan. Due to the small size of surface-mounted components and limited visible markings, I am not sure of its exact functionalities. This layout does help optimize space usage and thermal performance in a compact enclosure, however.
As mentioned previously, the fan used in the SilverStone Extreme 650Rz Gold 650W is a Globe Fan 92mm fluid-dynamic bearing fan. The fan itself is marked with the model number S0921512HHB and connects to the daughterboard serving the modular cable sockets via a 2-pin connector. Fan operation is controlled by an STCmicro STC15W408AS.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
