Description
Product Introduction & Engineering Value
A failed CompactPCI power module can take an otherwise healthy embedded controller or industrial computer offline. The TELKOOR AC-3U-250 is designed specifically for that chassis architecture, accepting wide-range AC input and supplying the multiple DC rails required by CompactPCI backplanes. TELKOOR specifies compliance with the PICMG 2.11 power-supply architecture.
The design is particularly relevant to systems using redundant power supplies. TELKOOR specifies hot-swap capability, active current sharing on the primary output rails, and N+1 redundancy. Its architecture uses separate converters for the 3.3 V and 5 V rails, allowing the available current on those rails to be used independently.
Technical Specifications
| Specification | AC-3U-250 |
|---|---|
| TELKOOR Model | CPCI-AC-3U-250 (3002) |
| TELKOOR Part Number | 900-3002-00 |
| Input Voltage | 85–264 VAC |
| Input Type | Wide-range AC |
| Maximum Output Power | 250 W continuous |
| Form Factor | 3U × 8HP |
| Backplane Interface | PICMG 2.11, 47-pin |
| Primary Outputs | +3.3 V and +5 V |
| Other Outputs | +12 V and -12 V |
| Current Sharing | Active current sharing on V1/V2 |
| Redundancy | N+1 full redundancy |
| Hot Swap | Supported |
| Minimum Load | None required |
| Operating Temperature | -5°C to +55°C without derating |
| Efficiency | Better than 81% at high line |
| Monitoring | On-board EEPROM for power-supply hardware configuration |
| Safety/Compliance | UL, CSA, CE; FCC Part 15 Class B / EN 55022 Class B with external line filter |
TELKOOR’s official documentation lists 85–264 VAC, 250 W continuous output, hot-swap active current sharing, N+1 operation, and a standard PICMG 47-pin connector.
A third-party technical listing gives more detailed rail information, including +5 V at 25 A, +3.3 V at 36 A, +12 V at 5 A, and -12 V at 0.5 A, with 250 W maximum combined output under the specified forced-air cooling conditions. Because these detailed values are not shown on TELKOOR’s current product page, they should be verified against the unit’s original datasheet/nameplate before using them for system load calculations.
Field Application & the “Trench” Experience
Consider a legacy CompactPCI industrial computer running a machine-vision or data-acquisition application. The CPU board, I/O cards, and backplane are still functioning, but the system repeatedly resets because one power-supply slot has developed an output problem. Replacing the entire chassis would create unnecessary integration work.
An engineer can instead replace the failed CPCI-AC-3U-250, verify the 47-pin backplane connection, check forced-air cooling, and allow the redundant supply architecture to restore the system. Where two or more compatible supplies are installed, the active current-sharing and N+1 design become important during both normal operation and a supply failure.
Specific application scenarios
- Industrial CompactPCI control computers: Power CPU, I/O, motion-control, and communication cards inside a 3U cPCI chassis.
- Defense and embedded computing: Supply mission-specific CompactPCI electronics where redundant power architecture is required.
- Telecom control platforms: Support 3U cPCI equipment operating from conventional AC infrastructure.
- Industrial data-acquisition systems: Maintain power to legacy cPCI acquisition and processing cards without replacing the complete chassis.
TELKOOR’s CompactPCI range is also described for industrial, telecom, defense, and other embedded-system applications.
AC-3U-250
AC-3U-250
Transparency SOP: QA & Testing
For New Surplus stock, the physical condition is only the first checkpoint. A 250 W cPCI power supply should be evaluated under load.
Inspection checklist
- ☐ Confirm CPCI-AC-3U-250 / 900-3002-00 identification.
- ☐ Inspect the 47-pin connector for bent, contaminated, or recessed contacts.
- ☐ Check the injector/ejector mechanism and front panel.
- ☐ Inspect cooling vents and internal airflow path.
- ☐ Verify AC input and protective-earth continuity before energization.
- ☐ Power the module using a controlled AC source.
- ☐ Check +3.3 V, +5 V, +12 V, and -12 V output rails.
- ☐ Test voltage stability under representative load.
- ☐ Verify status indication and power-fail behavior where applicable.
- ☐ If redundancy is required, test current sharing with a compatible second unit.
Do not treat a no-load power-up as a complete functional test. The manufacturer’s design specifically supports substantial current on the +3.3 V and +5 V rails, so representative loading is important when validating a replacement.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Confusing the 250 W rating with available power on every rail
The 250 W figure is a combined output rating. It does not mean 250 W is independently available from each voltage rail. The detailed third-party specification lists different current limits for +5 V, +3.3 V, +12 V, and -12 V.
PRO TIP: Calculate the actual cPCI card load by rail before replacing a supply. A system can remain below 250 W overall while still exceeding an individual rail’s current capability.
⚠️ Trap #2 — Ignoring airflow
The unit is designed for forced-air cooling. The third-party specification associates full 250 W operation with approximately 250 LFM airflow. Restricted chassis airflow can turn an apparently good replacement into an intermittent thermal problem.
⚠️ Trap #3 — Assuming every “AC-3U-250” listing is the same hardware
TELKOOR’s official product table identifies the model as CPCI-AC-3U-250, part number 900-3002-00. Verify the complete part number and connector configuration rather than purchasing solely from the abbreviated AC-3U-250 description.
⚠️ Trap #4 — Opening the module unnecessarily
This is an AC-input power supply. Internal components can retain hazardous voltage after power is removed. Troubleshooting should normally be performed at the system/interface level unless qualified personnel and the appropriate safety procedures are available.
Dynamic FAQ
What is the TELKOOR AC-3U-250?
It is a 250 W AC-input 3U CompactPCI power supply designed around the PICMG 2.11 architecture. TELKOOR identifies the product as CPCI-AC-3U-250 (3002).
What is the TELKOOR part number?
TELKOOR’s CompactPCI product table lists 900-3002-00 for the CPCI-AC-3U-250.
What AC voltage does it accept?
The specified input range is 85–264 VAC, making it suitable for common 115/120 VAC and 230/240 VAC installations.
Does it support hot swapping and redundancy?
Yes. TELKOOR specifies hot-swap operation, active current sharing on V1/V2, and N+1 full redundancy for the AC-3U-250.
Is the AC-3U-250 compatible with CompactPCI systems?
It is specifically designed as a 3U CompactPCI power supply with a standard PICMG 2.11 47-pin connector. Physical compatibility should still be confirmed against the chassis backplane and keying before installation.
How should New Surplus AC-3U-250 stock be verified?
Confirm the TELKOOR model and part number on the label, inspect the 47-pin connector and mechanical hardware, then perform controlled AC startup and loaded output testing. A unit being sold as New Surplus describes its inventory condition; it does not by itself establish a manufacturer’s warranty. Warranty terms and test coverage should be confirmed with the supplier before purchase.
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