Emerson / Artesyn / Astec LPS255-CEF Power Supply

The Emerson/Artesyn/Astec LPS255-CEF is a 250 W AC-DC switch mode power supply designed as an off-board module for system integration applications. It delivers regulated 24 VDC output with wide-range adjustability and incorporates active power factor correction, remote sense and inhibit capabilities, and single-wire current sharing for parallel operation. The unit operates across universal input voltage ranges with built-in EMI filtering to Class B standards and includes comprehensive protection circuits, making it suitable for industrial control, telecommunications, and distributed power systems requiring efficient, reliable conversion.

Technical Specifications Input Characteristics

Input voltage: 85–264 VAC or 120–300 VDC

Input frequency: 47–440 Hz

Active power factor correction reduces line harmonics and improves efficiency

Inrush current: 20 A maximum at cold start, 25°C

Safety ground leakage: <0.5 mA @ 50/60 Hz, 264 VAC Output Characteristics

Nominal output: 24 VDC with 2:1 wide-range adjustment capability (24–48 VDC)

Load regulation: 2%

Low output ripple and DC power good signal

Supervisory outputs: 5 V @ 100 mA and 12 V @ 500 mA regulated

Hold-up time: 20 ms at 250 W load, 115 VAC nominal Protection & Thermal Management

Short-circuit protection on all outputs

Overload protection at 10–145% above rated capacity

Overvoltage protection with selectable thresholds

Thermal overload protection

Fan-cooled operation; 30 CFM forced air cooling required if optional fans not installed

Operating temperature: 0–50°C; derating 2.5% per °C from 50–70°C EMI & Regulatory

Built-in EMI filter: FCC Class B, CISPR 22 Class B, EN55022 Class B, VDE 0878 PT3 Class B

Switching frequency: 120 kHz

Key Features

Remote sense compensates for voltage drop in load leads

Remote inhibit enables software-controlled shutdown

Single-wire current sharing simplifies parallel configuration for increased power delivery

Power fail signal alerts host systems to input loss conditions

Compact form factor: 261 × 127 × 50.8 mm

Typical Applications Distributed power architectures, industrial process control, telecommunications infrastructure, backup power systems, and multi-supply configurations requiring coordinated current sharing.