Key Takeaways
- The FSP220-50FGBBI is a compact 220 W ATX switching power supply designed for AC-line operation in industrial and embedded systems. It integrates an active PFC circuit and supports a wide input range of 90–264 VAC, enabling use in international deployments without manual input selection.
- Multiple DC output rails (+3.3 V, +5 V, +12 V, −12 V, +5Vsb) provide regulated power with low ripple and noise, supporting stable operation of processors, storage devices, and I/O hardware commonly used in mini industrial PCs and 1U systems.
- The power supply operates with typical efficiencies in the 82–85 % range and uses an internal 40 mm fan for forced-air cooling. A set of standard protection functions and a monitored power-good signal contribute to controlled system operation in continuous-duty applications.
- Environmental ratings, EMC characteristics aligned with FCC/CISPR 22 Class B, and an MTBF figure specified at 100,000 hours support use in long-term industrial deployments.
Flex-ATX design for compact industrial systems
The FSP220-50FGBBI follows Flex-ATX and ATX12V mechanical guidelines, allowing integration into many existing 1U and small-form-factor enclosures. The form factor is suited to space-constrained systems where moderate power levels are required.
Compared with consumer-grade PC power supplies, the design targets continuous operation, extended environmental conditions, and industrial EMC requirements, making it suitable for OEM and system-integrator use.
Electrical performance and output rails
The AC input stage incorporates active power factor correction and meets harmonic current limits according to EN 61000-3-2. The supported input range is 90–264 VAC at 47–63 Hz, enabling operation across regional mains systems.
DC output rails (per specification)
- +3.3 V: up to 8 A
- +5 V: up to 12 A
- +12 V: up to 14 A
- −12 V: up to 0.3 A
- +5Vsb: up to 2.5 A
The maximum total output power is 220 W, with a combined +3.3 V / +5 V limit of 61 W.
Voltage regulation is specified as:
- ±5 % for the main rails
- ±10 % for the −12 V rail
Ripple and noise levels are specified at:
- 50 mVpp for +3.3 V, +5 V, and +5Vsb
- 120 mVpp for +12 V and −12 V
These characteristics support reliable operation of digital logic and communication interfaces.
Protection features and power-good signaling
The power supply integrates standard protection mechanisms, including:
- Over-voltage protection (OVP) on +3.3 V, +5 V, and +12 V
- Over-current protection (OCP) on the main rails
- Over-power protection (OPP) with latch-off behavior at overload
A TTL-compatible power-good (P.G.) signal indicates when all output voltages are within regulation. At approximately 50 % load, the signal is specified to assert 100–500 ms after power-on and deassert at least 1 ms before regulation is lost, supporting controlled system startup and shutdown behavior.
Efficiency, standby behavior, and cooling concept
According to the datasheet, typical efficiency values are approximately:
- 82 % at full load
- 85 % at 50 % load
- 82 % at 20 % load
These figures apply at both 115 VAC and 230 VAC input and contribute to reduced thermal load in compact enclosures.
The +5Vsb standby rail is designed to support compliance with ErP / Lot 6 requirements, with specified efficiency levels exceeding 45 % at low standby load and increasing at higher standby currents. This supports always-on system functions such as Wake-on-LAN.
Cooling is provided by an internal 40 mm fan mounted at the rear of the housing. Airflow is drawn through the front grille and exhausted on the cable side, supporting use in dense 1U racks and fan-restricted industrial housings.
Environmental specifications, EMC, and reliability
Environmental ratings
- Operating temperature: 0 °C to +50 °C
- Storage temperature: −20 °C to +80 °C
- Operating humidity: up to 85 % non-condensing
The power supply meets the vibration and shock levels stated in the datasheet, supporting use in industrial and mobile installations.
EMC characteristics
The design is specified as FCC / CISPR 22 Class B compliant, meeting:
- FCC Part 15 Class B at 115 VAC
- CISPR 22 Class B at 230 VAC
This supports system-level EMC conformity when integrated into finished equipment.
Reliability
MTBF calculations based on MIL-HDBK-217 specify 100,000 hours at 25 °C, full load, and nominal input voltage.
Typical applications
- Mini and 1U industrial PCs for factory automation and vision systems
- Compact servers and network appliances with moderate power demand
- Communication and telecom equipment requiring wide AC input range and active PFC
- Embedded controllers and OEM devices using ATX-compatible power architectures
Conclusion
The FSP220-50FGBBI power supply is a 220 W Flex-ATX industrial power supply with active PFC, wide AC input range, multiple regulated output rails, and standard protection features. Its mechanical format, environmental ratings, and specified EMC characteristics make it suitable for compact industrial PCs, 1U systems, and embedded equipment intended for continuous operation in industrial environments.
