The Emerson/Artesyn/Astec LPQ252 is a 250 W enclosed AC-DC power supply module engineered for ITE applications requiring multi-output voltage delivery. This unit supplies four independent outputs—three fixed and one adjustable—with active power factor correction and integrated EMI filtering. The design incorporates short-circuit protection across all outputs, overvoltage clamping, and thermal overload safeguards. Remote sense compensation, DC-OK and power-fail TTL signaling, and single-wire current sharing enable flexible integration into distributed power architectures.
## Technical Specifications
**Input Characteristics**
• Input voltage: 85–264 VAC or 120–300 VDC
• Input frequency: 47–440 Hz
• Efficiency: Typically 75% at full load
• Hold-up time: 16 ms at 250 W load, 115 VAC nominal
**Output Configuration**
• Output 1: 5 VDC, 35 A continuous / 40 A peak, ±2% regulation, 50 mV ripple
• Output 2: 12 VDC, 10 A continuous / 12 A peak, ±3% regulation, 120 mV ripple
• Output 3: −12 VDC, 6 A continuous / 8 A peak, ±3% regulation, 120 mV ripple
• Output 4: ±5 V to 25 V adjustable (factory set 5 V), 6 A continuous / 8 A peak, ±3% regulation, 240 mV max ripple
• Supervisory outputs: 5 V @ 100 mA and 12 V @ 500 mA (both regulated)
**Protection and Control**
• Overvoltage clamp on 5 V output: 5.7–6.7 VDC
• Remote inhibit/on-off via external N.O. or N.C. contact
• Power-fail and DC-OK TTL signals: transition 50–150 ms after 5 V output availability
• Remote sense: 0.5 V lead-drop compensation
• Current sharing: Single-wire topology
**Physical and Regulatory**
• Dimensions: 262 mm L × 127 mm W × 50.8 mm H
• Weight: Approximately 1.19–1.41 kg
• Certifications: UL, CSA, CE, CB, BABT, VDE, NEMKO; EMC compliance per CISPR 22, EN55022, EN61000-3-2, FCC Class B
## Key Features
• Active power factor correction minimizes input harmonic distortion
• Multi-output architecture with both positive and negative rails
• Wide input frequency tolerance: 47–440 Hz operation
• TTL-compatible signaling for power-fail and regulation-OK monitoring
• Short-circuit protection at 110–145% above peak output rating
## Typical Applications
• Distributed power systems in enterprise computing equipment
• Multi-voltage rail supply for telecommunications infrastructure
• Industrial control and networking equipment requiring redundant voltage rails
## Compatibility & Integration
The LPQ252 integrates into systems via standard TTL control signals and remote sense leads. Single-wire current sharing allows paralleling for increased capacity. The adjustable fourth output accommodates custom voltage requirements within the ±5 V to 25 V range.
