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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Voltage | 85–264 VAC / 120–300 VDC |
| Input Frequency | 47–63 Hz |
| Total Power | 110 W convection; 175 W with 30 CFM forced air |
| Output 1 (Main) | 5 V (adj. 3.3–5.5 V), 0–15 A conv. / 30 A forced |
| Output 2 | 12 V, 0–6 A conv. / 8 A forced |
| Output 3 | –12 V (adj. –12 to –15 V), 0–1.5 A conv. / 3 A forced |
| Output 4 (Floating) | 3.3–25 V (factory set typically near 5 V), 0.5–2 A conv. / 5 A forced |
| Efficiency | 75 % typical at full load |
| Hold-up Time | 20 ms at 175 W, nominal line |
| Power Factor | 0.99 typical (active PFC) |
| Operating Temperature | 0 °C to 50 °C ambient (derate 2.5 %/°C to 70 °C) |
| Dimensions | 216 mm × 108 mm × 38.1 mm (8.5″ × 4.25″ × 1.5″) |
| Mounting | Chassis mount, open frame (optional -C cover) |
| Protections | OVP, OLP, thermal overload, short-circuit |
| Features | Remote sense (main), single-wire current share, power-fail signal, remote inhibit, 5 V standby @ 200 mA, DC-OK |
4. Product Introduction
The Artesyn LPQ172 is a quad-output open-frame AC/DC power supply from the LPQ170 series. It delivers regulated 5 V, 12 V, –12 V, and an adjustable floating 3.3–25 V rail for industrial control systems, test equipment, and commercial electronics that need multiple voltage rails from a universal 85–264 VAC input.
Active power-factor correction, remote sense on the main output, and single-wire current sharing make it a practical drop-in for systems originally designed around the LPQ170 family. Rated 110 W convection or 175 W with 30 CFM forced air, it includes standard protections and a 5 V standby rail. As an obsolete model, remaining units are new original / new surplus stock with limited availability.
LPQ172
LPQ172
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No outputs, no LEDs | Input power missing or fuse blown | ✅ High | Measure 85–264 VAC at input terminals; check input fuse | Restore AC power or replace fuse before swapping unit |
| Main 5 V low or unstable | Overloaded or remote sense open | ✅ High | Measure voltage at load vs. at terminals; verify sense leads | Reduce load or reconnect sense; confirm within 15 A / 30 A rating |
| One auxiliary rail missing | Local overload or short | ✅ High | Isolate that rail and re-measure; check for shorted load | Clear short or reduce load on that channel |
| Unit shuts down under load | Insufficient airflow or high ambient | ✅ High | Confirm 30 CFM forced air if >110 W; measure case temperature | Add cooling or derate; do not exceed 50 °C ambient without forced air |
| Power-fail signal always active | Input brown-out or hold-up issue | ❌ Medium | Monitor AC line voltage under load; check hold-up with scope | Stabilize input voltage; verify 20 ms hold-up at rated load |
| Excessive ripple on outputs | Missing output capacitors or aging | ✅ Medium | Scope outputs with 20 MHz bandwidth and recommended capacitors | Add local bulk capacitance; unit may need replacement if ripple remains high |
If the unit still fails after these checks, capture photos of the installation, input voltage readings, and load currents, then contact technical support with the diagnostic details.
6. Frequently Asked Questions (FAQ)
Q: Is the LPQ172 still in production?
No. It is obsolete (last-time-buy roughly 2021). Current stock is new original / new surplus. Lead times and quantities are limited—confirm availability before placing a production-volume order.
Q: What is the difference between LPQ172 and LPQ172-C?
The base LPQ172 is open-frame. The -C version adds a cover and is limited to 50 °C operation with reduced convection rating (typically 75 W with cover). Forced-air rating drops to about 130 W with the cover installed.
Q: Can I adjust the output voltages in the field?
Yes. The main 5 V rail is adjustable 3.3–5.5 V, the –12 V rail is adjustable –12 to –15 V, and the floating fourth output is adjustable 3.3–25 V. Use a non-conductive tool on the pots while monitoring with a calibrated meter. Factory settings are typically 5 V / 12 V / –12 V / ~5 V.
Q: Does it require forced-air cooling?
Only if you need more than 110 W. Convection cooling supports 110 W; 30 CFM forced air raises the rating to 175 W. Always leave clearance for airflow and monitor case temperature in the final enclosure.
Q: Is remote sense required?
No. The supply operates without the sense leads connected, but voltage at the load will drop by the wire resistance. For critical 5 V rails, connect remote sense to maintain regulation at the load (compensates up to 0.5 V drop).
Q: What about warranty and condition?
Units ship as new original / new surplus, unopened or factory-sealed where available. Standard coverage is 1-year functional warranty after receipt. Test reports and photos are available on request. Verify exact serial-number dating and any date-code restrictions for your application before installation.
Q: Can I parallel multiple units for higher current?
Yes, via the single-wire current-share feature on the main output. Follow the datasheet for share-bus connection and ensure identical voltage settings. Leave margin for current-share imbalance.
