Key Takeaways
- The FSP300-70PFL(SK) power supply is a 300 W switching power supply in ATX form factor, intended for industrial PCs, workstations, and embedded automation systems.
- A wide AC input range of 90–264 VAC combined with active power factor correction (PFC) supports use in international installations without manual voltage selection.
- Multiple output rails (3.3 V, 5 V, 12 V, 5 Vsb) provide compatibility with common industrial PC motherboards, storage devices, and peripherals.
- Integrated protection functions such as over-voltage, over-current, and short-circuit protection support safe and predictable system behavior.
- Compliance with FCC Part 15 and CISPR 22 Class B emission limits facilitates integration into EMC-sensitive industrial and light-commercial environments.
Industrial ATX Power Supply for Demanding Applications
This 300 W ATX power supply is positioned for industrial PCs, workstations, servers, and automation controllers that require continuous operation under defined electrical and thermal conditions. In contrast to consumer desktop power supplies, industrial systems are typically installed in closed cabinets, exposed to higher ambient temperatures, and expected to operate reliably over extended duty cycles.
The unit delivers 300 W of continuous output power and uses forced-air cooling via an integrated 80 mm fan. When operated within its specified limits, the design supports long service life in industrial control cabinets and embedded systems.
An active PFC front end improves input current characteristics and supports compliance with EN 61000-3-2 harmonic current requirements, while helping maintain stable DC output rails under varying mains conditions.
Electrical Performance and Output Configuration
The power supply follows the ATX specification and provides multiple regulated output rails, including +3.3 V, +5 V, +12 V, +5 V standby, as well as −12 V and optional −5 V for legacy interfaces.
Typical maximum output currents include:
- +3.3 V: up to 19 A
- +5 V: up to 16 A
- +12 V1 / +12 V2: up to 17 A each
This configuration allows system designers to support both modern 12 V-dominant architectures and applications that still rely on 5 V and 3.3 V rails. Output regulation and ripple performance are designed to remain within ATX specification limits across the rated load range.
A minimum hold-up time of 12 ms at full load helps reduce the risk of system resets during short AC voltage interruptions. The integrated power-good (P.G.) signal provides a TTL-level status output for controlled system start-up and shutdown.
Wide Input Range, Power Factor Correction, and Efficiency
The input stage supports a wide AC voltage range from 90 to 264 VAC at 47–63 Hz, enabling worldwide deployment without manual configuration. This simplifies system qualification and logistics for OEMs serving international markets.
Active PFC improves the input power factor and reduces reactive power on the mains side. Typical efficiency values are in the mid-80 % range at nominal load conditions, depending on operating point and system configuration. This contributes to lower internal heat dissipation compared with less efficient designs.
The 5 V standby rail is optimized for low standby power consumption and supports functions such as wake-on-LAN and remote system start. Energy efficiency behavior is aligned with applicable eco-design requirements, including EU Lot 6, when assessed at system level.
Protection Functions and Reliability Considerations
Standard protection mechanisms are integrated, including over-voltage protection (OVP), over-current protection (OCP), and short-circuit protection (SCP). In fault conditions, the power supply shuts down to limit electrical stress on connected components and resumes normal operation once the fault is removed, depending on the protection mode.
The mechanical design supports operation in industrial environments with defined shock and vibration limits. Reliability data indicate an MTBF of 100,000 hours, calculated according to MIL-HDBK-217 under specified reference conditions (25 °C ambient temperature, nominal input voltage, full load).
Temperature Range and EMC Compliance
The unit is specified for operation from 0 °C to +50 °C at full rated output power, with a storage temperature range from −20 °C to +80 °C. These limits support deployment in control cabinets and factory environments with varying ambient conditions.
From an EMC perspective, the power supply meets the conducted and radiated emission limits of FCC Part 15 and CISPR 22 Class B. This can simplify system-level EMC compliance when integrated into finished equipment, subject to overall system design and layout.
Typical Applications
- Industrial PCs and panel PCs used in process control, SCADA, and machine vision systems
- Embedded servers and rugged workstations for manufacturing and data acquisition
- Automation controllers, test systems, and measurement equipment requiring ATX-compatible power rails
- Replacement or upgrade of legacy industrial PC power supplies with ATX form-factor constraints
Conclusion
The FSP300-70PFL(SK) is a 300 W ATX industrial power supply intended for embedded and industrial PC systems that require wide AC input compatibility, multiple regulated outputs, and defined protection functions. Compared with consumer ATX power supplies, it is designed for continuous operation in controlled industrial environments, where thermal stability, EMC behavior, and long-term availability are relevant design considerations.
