Description
Key Technical Specifications
- Model Number: AC-3U-250
- Manufacturer: TELKOOR
- Series/System: CompactPCI (cPCI) Power Solutions
- Module Type: AC/DC CompactPCI Power Supply
- Form Factor: 3U High, 8HP Wide
- Total Output Power: 250W (with 250 LFM forced air)
- AC Input Voltage: 90-264 VAC, Auto-ranging, Single Phase
- Primary Outputs: +5V @ 30A, +3.3V @ 40A
- Auxiliary Outputs: +12V @ 5A, -12V @ 1A
- Efficiency: >80% at 230VAC Full Load
- Hot Swap: Yes, with Active Current Share
- Redundancy: N+1 Full Redundancy Capable
Functional Role & Application Analysis
The TELKOOR AC-3U-250 is a high-density power engine built for the CompactPCI standard. In embedded computing, power isn’t just about voltage; it’s about fitting 250W into a 3U slot without melting the backplane or starving adjacent cards. This module solves that thermal and spatial bottleneck. It uses two parallel converters—one dedicated to 5V, one to 3.3V—so both rails can deliver maximum current simultaneously without cross-regulation issues.
Engineers specify this unit when reliability is non-negotiable:
- Military & Aerospace Systems: Powering mission-critical COTS computing in radar, communications, and avionics where MTBF and shock/vibration tolerance are paramount.
- Telecom Infrastructure: Providing redundant power for CompactPCI-based network management, switching, and signal processing cards in central offices.
- Industrial Test & Measurement: Driving high-current FPGA and DSP boards in automated test equipment that demand clean, stable rails under dynamic loads.
- Legacy System Sustainment: Replacing failed power supplies in aging cPCI platforms where the original vendor no longer supports the hardware.
Our Quality Standard & Testing Process
Power supplies are the most common point of failure in embedded systems. A marginal unit might boot fine on the bench but collapse under load or fail after a thermal cycle. We test every AC-3U-250 to simulate real-world stress.
- Visual & Component Inspection: We inspect the AC input connector, backplane pins, and internal magnetics for physical damage, corrosion, or signs of thermal runaway.
- Live System Test: The module is installed in a cPCI test chassis and run for 24 hours at full load with forced air cooling to verify thermal stability and output regulation.
- Full-Function Diagnostics: We verify hot-swap insertion/removal without system reset, confirm active current sharing between parallel converters, and validate all protection circuits (OVP, OCP, OTP).
- Warranty Backing: Only modules that pass all electrical and thermal tests ship with our 12-month warranty. Any unit showing output ripple beyond spec is rejected.
TELKOOR-AC-3U-250
Compatibility & Migration Paths
CompactPCI power supplies have strict mechanical and electrical requirements. The AC-3U-250 is not a universal drop-in. Verify these points before ordering:
- Form Factor Confirmation: This is a 3U, 8HP module. Ensure your chassis has sufficient depth and that adjacent slots can accommodate the extractor handles and airflow requirements.
- Backplane Compatibility: Verify your cPCI backplane supports the PICMG 2.11 standard and has the correct 47-pin power connector pinout. Older or custom backplanes may require adapter harnesses.
- Airflow Requirement: The 250W rating assumes 250 LFM forced air. If your system uses natural convection or lower airflow, the module will derate significantly. Check the thermal design of your enclosure.
- Redundancy Configuration: For N+1 operation, you must use identical modules and ensure the backplane supports active current sharing. Mixing different power supply models in a redundant pair will cause load imbalance and potential failures.
- Get Expert Help: Unsure if your cPCI chassis or backplane is compatible? Contact our technical team with your chassis manufacturer and model for a free compatibility check.
