Product Overview

The document details specifications for the ENP-120 series, a 120W level desktop type power supply. Models include ENP-120-12, ENP-120-24, and ENP-120-48, differentiated by output voltage levels.

Electrical Specifications

• Output Voltage and Current: Ranges from 13.8V to 55.2V with rated currents from 2.2A to 8.7A depending on model.
• Output Power: Approximately 120W to 150W depending on model.
• Voltage Adjustment Range: Varies per model, e.g., 11.5–15V for ENP-120-12.
• Ripple & Noise: Maximum ripple ranges from 150mVp-p to 350mVp-p.
• Voltage Tolerance: ±1.0% typical, with line and load regulation within ±0.5% to ±2.0%.
• Hold-up Time: Typically 1000ms at 100ms full load, 20ms at full load.
• Input Voltage Range: 90–264VAC or 127–370VDC, frequency 47–63Hz.
• Power Factor: >0.98 at 115VAC, >0.95 at 230VAC at full load.
• Efficiency: Approximately 89.5% to 91.5% depending on model.
• Inrush Current: Cold start peak of 65A at 230VAC.
• Leakage Current: Less than 3.5mA at 240VAC.

Protection Features

• Overload Protection: Operates normally within 110–125% rated output power for over 3 seconds, then switches to constant current limiting with auto-recovery.
• Short Circuit Protection: Constant current limiting with automatic recovery after fault removal.
• Over Voltage Protection: Shuts down output voltage if >125% rated power, requires power cycling to recover.
• Over Temperature Protection: Shuts down output voltage and recovers automatically after temperature decreases.

Safety and Standards

• Certified to IEC60950-1, UL60950-1, and EAC TP TC 004 standards.
• Withstand voltage: Input to output 3KVAC, input to frame ground 2KVAC, output to frame ground 0.5KVAC.
• Isolation resistance: 100M Ohms minimum at 500VDC, 25°C, 70% RH.

Environmental Conditions

• Operating temperature: -30°C to +70°C (with derating curve applied).
• Operating humidity: 20% to 95% non-condensing.
• Storage temperature: -40°C to +85°C, 10% to 95% non-condensing.
• Temperature coefficient: ±0.05% per °C from 0 to 50°C.
• Vibration resistance: 10–500Hz, 2G, 10 minutes per cycle, 60 minutes each on X, Y, Z axes.
• MTBF: Minimum 257,000 hours per MIL-HDBK-217F at 25°C.

Mechanical and Packaging

• Dimensions: 192mm (L) x 178mm (W) x 45.5mm (H).
• Weight: 0.98 kg.
• Packing: 10 pieces per carton, total weight 10.8 kg, volume 1.38 cubic feet.

Additional Notes and Testing

• Ripple and noise measured with 12" twisted pair wire terminated with 0.1uF and 47uF parallel capacitors at 20MHz bandwidth.
• Line regulation measured from low to high line at rated load; load regulation from 0% to 100% rated load.
• Setup time measured at cold start; rapid ON/OFF switching may increase setup time.
• Derating required at low input voltages as per derating curve.

EMC and Immunity Compliance

• Meets EN55024, EN55032 (CISPR32), FCC PART15, EN61000 series standards for emission and immunity.
• Test levels include ESD up to 8kV air discharge, radiated immunity 3V/m, EFT/burst 1kV, surge 1kV line-line and 2kV line-earth, voltage dips and interruptions, harmonic current, and voltage flicker.

Block Diagram and Circuit Description

The power supply includes PWM and PFC circuits, EMI filter, rectifiers, power switching, overvoltage protection, constant current limiting, and start circuit. The design ensures stable output and protection under fault conditions.

Installation and Contact Information

Terminal assignments are provided for output connections. Installation manual is available online. Contact details for Pewatron AG headquarters and various regional offices and product specialists are listed for technical support and sales inquiries.