Overview
The FSP400-50AAC is an ATX 400 W switching power supply designed for desktop PCs, industrial PCs (IPC), embedded systems, and light workstation platforms.
It combines:
- 80 PLUS Bronze efficiency
- Universal AC input
- Defined electrical protection functions
- Standard ATX mechanical compatibility
The unit is intended for systems that require predictable power delivery, defined safety approvals, and compatibility with established ATX platforms.
Key Features at a Glance
- Rated power: 400 W
- Form factor: PS/2 ATX (140 × 150 × 86 mm)
- Input range: 90–264 VAC, 47–63 Hz
- Efficiency class: 80 PLUS Bronze
- Output rails: +3.3 V, +5 V, +12 V, −12 V, +5 Vsb
- Protection functions: OCP, OTP, OVP
- Cooling: Integrated 120 mm fan
- MTBF (specified): 100,000 hours
- Safety reference: CB certification to IEC 62368-1
- Platform alignment: Intel ATX12V v1.4
Input & Efficiency
Universal AC Input
The FSP400-50AAC operates across 90–264 VAC and 47–63 Hz, supporting deployment in different regions without requiring multiple PSU variants.
For system integrators, this can simplify logistics and spare part management in internationally deployed systems.
80 PLUS Bronze Efficiency
The unit carries an 80 PLUS Bronze rating, indicating efficiency levels aligned with Bronze-class requirements under defined load conditions.
Higher conversion efficiency can contribute to:
- Reduced internal heat generation
- Lower cooling demand inside the chassis
- Improved overall system thermal behavior
Efficiency performance depends on load profile and operating conditions.
Output Rails & Electrical Performance
The power supply provides standard ATX rails:
- +3.3 V
- +5 V
- +12 V
- −12 V
- +5 V standby (5Vsb)
These rails support common motherboard logic, storage devices, add-in cards, cooling systems, and standby functions.
Ripple & Noise
Specified ripple and noise limits include:
- 50 mV p-p on +3.3 V, +5 V, and +5 Vsb
- 120 mV p-p on +12 V and −12 V
Controlled ripple levels are relevant in applications involving SSDs, communication modules, I/O cards, and other peripherals sensitive to supply noise.
Actual system stability depends on total load distribution and integration quality.
Protection Functions
The FSP400-50AAC includes the following protection mechanisms:
- OCP – Over Current Protection
- OVP – Over Voltage Protection
- OTP – Over Temperature Protection
These functions are designed to limit escalation of electrical faults such as overload, abnormal temperature rise, or voltage excursions. Protection behavior depends on system configuration and fault conditions.
Mechanical Integration
The PSU follows the PS/2 ATX mechanical envelope with dimensions of:
140 × 150 × 86 mm
This format supports integration into standard ATX-compatible desktop cases and many industrial PC enclosures.
Cooling is provided by an integrated 120 mm fan, aligned with common chassis airflow concepts.
Compliance & Platform Alignment
For compliance-driven projects, documented approvals are often required during system validation.
The FSP400-50AAC is positioned as:
- CB certified to IEC 62368-1
- Designed to align with Intel ATX12V v1.4
The product page references additional approvals (e.g., UL, FCC, TÜV, CE, CCC, RoHS). Applicability may depend on the specific production version and target market.
System integrators should verify approval scope for their intended deployment region.
Reliability Considerations
The power supply specifies an MTBF of 100,000 hours (mean time between failures), based on manufacturer-defined conditions.
MTBF is a statistical reliability indicator and does not represent a guaranteed service life. Actual lifetime depends on:
- Ambient temperature
- Load profile
- Ventilation and airflow
- Operating environment
For industrial or long-runtime applications, thermal design and proper derating remain essential.
Typical Application Areas
The FSP400-50AAC may be suitable for:
- Desktop PCs requiring a standard ATX 400 W PSU
- Industrial PCs with universal AC input requirements
- Embedded systems using legacy ATX platforms
- Light workstations and entry-level servers within 400 W power budgets
System-level validation is recommended to confirm rail loading, protection behavior, and thermal performance.
FAQ
Is the FSP400-50AAC suitable for international installations?
It supports 90–264 VAC and 47–63 Hz input, which enables use across regions with different mains standards.
What output rails are available?
+3.3 V, +5 V, +12 V, −12 V, and +5 V standby (5Vsb), covering standard ATX requirements.
Why is low ripple relevant?
Lower ripple and noise levels can support stable operation of storage devices, communication interfaces, and sensitive peripherals. System performance also depends on PCB layout and overall integration.
Request Pricing or Integration Support
For projects involving the FSP400-50AAC, TPS Elektronik can support:
- Technical documentation requests
- Availability and sourcing inquiries
- Integration guidance (mechanical fit, rail budgeting, validation considerations)
Please contact our team to discuss your specific system requirements.
