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Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Voltage | 18 to 36 Vdc (22–29 Vdc nominal per MIL-STD-704F, 28 Vdc nominal) |
| Transient Rating | 50 Vdc, 12.5 msec, auto-restart shutdown |
| Combined Output Power | 450–550 W (baseplate temperature dependent, see derating curve) |
| Output Voltages (V1–V4) | +5 Vdc (40 A / 200 W), +3.3 Vdc (55 A / 182 W), +12 Vdc (7.1 A / 85 W), –12 Vdc (7.1 A / 85 W) |
| Efficiency | 85% min., 87% typical |
| Voltage Set Point Accuracy | ±2% Vout nominal |
| Temperature Regulation | ±0.01% / °C |
| Output Ripple | 50 mV pk-pk max (V1–V2), 100 mV pk-pk max (V3–V4), 20 MHz BW |
| Start-Up Time | 500 ms max |
| Operating Temperature | –40°C to +75°C (550 W); –40°C to +85°C (450 W), at baseplate wedgelocks |
| Non-Operating Temperature | –55°C to +100°C |
| Size / Weight | 6U x 4hp x 160 mm, 2.4 lb typical |
| Connector | Positronics PCIH47M400A1 or equivalent, 47-pin |
| Environmental | MIL-STD-810F (vibration/shock), MIL-STD-461E (EMI, CE102/CS101), 0–95% humidity non-condensing |
Product Introduction
The Vicor VME450-01 is a single-slot, 28 Vdc VME power supply built by Aegis Power Systems, a Vicor Custom Design Center, using Vicor’s V•I Chip conversion architecture — two M-FIAM front-end modules paired with six PRMs and six VTMs. It delivers four regulated outputs (+5V, +3.3V, +12V, –12V) at up to 550 W combined, and it’s built to MIL-STD-704F input transient tolerance, MIL-STD-810F shock/vibration, and MIL-STD-461E EMI compliance.
This is the part engineers pull when maintaining an existing VME450-based chassis in defense, aerospace, or industrial COTS deployments — Vicor’s own successor, the VME550, is a plug-in replacement but carries a different front-end module (M-FIAM7B) and connector keying option set, so it’s not a blind swap into every legacy rack. At 85% efficiency and 2.4 lb, the VME450-01 was chosen over conventional linear VME supplies specifically for the weight and thermal margin it freed up in the chassis.
IVME-450
IVME-450
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No outputs, Power OK pin shows fail (open collector) | Input voltage out of 22–29 Vdc normal range, or Inhibit pin asserted | ❌ Low | Measure Pin 46/47 input voltage; check Pin 39 Inhibit isn’t pulled to negative input | Correct input voltage/inhibit wiring before replacing |
| One output missing, others present | Load short on that rail, or output derating exceeded | ❌ Low | Check output loading against the derating curve for baseplate temp | Verify load and baseplate temp before condemning unit |
| Ripple/noise complaints on ±12V rails | Exceeding 100 mV pk-pk spec, or inadequate output filtering downstream | ❌ Low | Scope the rail at 20 MHz bandwidth at the connector | Add local decoupling before assuming supply fault |
| Unit shuts down under normal load, auto-restarts | Input transient triggered auto-restart protection (per MIL-STD-704F) | ❌ Low | Log input voltage during shutdown event | Normal protective behavior — check upstream bus for transients |
| No output at all, Power OK never asserts, input voltage confirmed good | Internal V•I Chip module or PRM/VTM failure | ✅ High | Confirm 22–36 Vdc present at Pins 46/47 with correct polarity | Replace unit if input confirmed correct and no output present |
This supply’s current-limit and auto-restart behavior is a designed protection feature, not a fault — most “dead supply” calls trace back to input transients or exceeding the power derating curve at high baseplate temperature, not an internal failure. If you’re still stuck, contact technical support with baseplate temperature, input voltage log, and Power OK pin status.
Frequently Asked Questions (FAQ)
Is the VME450-01 still in production?
No. Vicor/Aegis introduced the VME550 as its designated plug-in replacement back in 2011. The VME450-01 is maintenance-stock only at this point — you’re buying it to keep an existing chassis running, not for a new design.
Can I just drop in a VME550 instead?
Mechanically it’s designed as a plug-in replacement, but check your connector keying and inhibit/Power OK wiring first — the VME550 uses Vicor’s newer M-FIAM7B front-end module and offers configurable output inhibit control that the VME450 doesn’t have in the same form. If your chassis wiring assumes -specific pin behavior, verify before swapping.
Why is this cheaper than buying new from Vicor?
Because it’s surplus or pulled stock — Vicor and Aegis aren’t building new -01 units. Ask your supplier directly whether it’s New Surplus (unused, pulled from excess inventory) or Refurbished (removed from service, tested). Request actual test data — input/output voltage under load — not just a visual pass.
Does it retain any programming or configuration when swapped?
There’s nothing to program — output voltages and current limits are fixed by the hardware design (Table 1 in the datasheet). The only “configuration” is the connector wiring itself, so verify your harness matches the 47-pin Positronics PCIH47M400A1 pinout before installing.
Is it hot-swappable?
No — treat it as a power-down swap. Pull input power at the source before removing or installing this card; there’s no live-insertion spec listed for this connector/backplane combination.
What warranty applies to a surplus unit?
Aegis’s factory warranty is two years from original shipment date and doesn’t transfer cleanly to a resold surplus unit years later. Get your seller’s own return/exchange terms in writing — don’t assume the original Aegis warranty still applies.
What’s the biggest install mistake with this part?
Ignoring the power derating curve. This supply is rated 550 W at 75°C baseplate but drops to 450 W by 85°C — if your chassis runs hot and you’re pushing full load, you’ll get thermal shutdowns that look like a bad supply but are actually spec-compliant behavior. Check your actual baseplate temperature under load before troubleshooting further.
