Product Overview

The LM350-20BxxR2S Series is a high-efficiency, high-power density industrial switching power supply in a compact metal enclosure from MORNSUN. Designed for demanding applications, it integrates an active PFC (Power Factor Correction) circuit, a built-in cooling fan, and offers exceptional reliability. This series provides a wide universal input voltage range, excellent efficiency meeting international energy standards, and comprehensive protection features.

Product Models: LM350-20B12R2S, LM350-20B24R2S, LM350-20B36R2S, LM350-20B48R2S

Key Features

• High Power Density: Compact 199mm x 110mm x 50mm metal enclosure with integrated fan for reliable 350W continuous output.
• Wide Universal Input with Active PFC: Input range 90 - 264VAC / 127 - 370VDC. Integrated active PFC circuit (typical PF ≥0.95 at 230VAC full load).
• High Efficiency: Up to 92.5% typical efficiency, complying with DOE Level VI and CoC Tier 2 standards.
• Wide Operating Temperature Range: -30°C to +70°C (with derating up to +80°C).
• High Isolation: 3000VAC input-output isolation (for 1 minute).
• Low Standby Power Consumption: <1.0W (at 230VAC).
• Comprehensive Protections: Short-circuit protection (Hiccup mode, self-recovery), over-current protection (Constant current limiting, self-recovery), over-voltage protection (Clamping, self-recovery), over-temperature protection (with automatic recovery).
• High-Altitude Operation: Suitable for applications up to 5000 meters.
• Safety Compliance: Meets EN62477 Overvoltage Category III requirements.
• High Reliability & Warranty: 3-year warranty.

Applications

Industrial automation equipment, LED displays and lighting, broadcast and stage equipment, security systems, telecommunications infrastructure, and other high-power, high-reliability applications.

Safety & EMC Compliance

• Safety Standards: Certified to BS EN/EN62368-1; complies with UL62368-1, CSA C22.2 No. 62368-1. Safety Class I.
• EMC Standards:
  • EMI: Conducted and Radiated Disturbance meets CISPR32/EN55032 Class B.
  • EMS: Complies with IEC/EN61000-4 series, including ESD (Contact ±4kV/Air ±8kV), Radiated Immunity (10V/m), EFT/Burst (±2kV for power port), Surge (Line-Line ±2kV/Line-PE ±4kV), Conducted Immunity (10V), etc. Performance Criterion A.

Model Selection & Output Parameters

The product is available in a standard version with a built-in cooling fan. The output voltage can be adjusted within the specified range via the onboard potentiometer.

Detailed Model Specifications:

• LM350-20B12R2S: Output Power 348W, Rated Output 12V/29A, Output Voltage Adjustment Range 10.8-13.2V, Typical Efficiency 91.0%.
• LM350-20B24R2S: Output Power 348W, Rated Output 24V/14.5A, Output Voltage Adjustment Range 21.6-26.4V, Typical Efficiency 92.0%.
• LM350-20B36R2S: Output Power 349.2W, Rated Output 36V/9.7A, Output Voltage Adjustment Range 32.4-39.6V, Typical Efficiency 92.5%.
• LM350-20B48R2S: Output Power 350.4W, Rated Output 48V/7.3A, Output Voltage Adjustment Range 43.2-52.8V, Typical Efficiency 92.5%.

Detailed Electrical Specifications

Input Characteristics:

• Input Voltage Range: 90-264VAC; 127-370VDC.
• Input Frequency: 47-63 Hz.
• Input Current (Max.): 8.0A @ 90VAC; 4.2A @ 264VAC.
• Inrush Current (Max.): 80A (peak) @ 230VAC cold start.
• Leakage Current: <2.0mA @ 264VAC.
• Efficiency: Meets DOE Level VI and CoC Tier 2 standards.
• Power Factor (PF) with Active PFC: Typical PF ≥0.95 @ 230VAC, 100% Load.

Output Characteristics:

• Output Voltage Accuracy: ±2%.
• Line Regulation: ±0.5%.
• Load Regulation: ±0.5% (20%-100% load).
• Output Ripple & Noise (Peak-to-Peak, 20MHz BW):
  • 12V, 24V models: 120mV max.
  • 36V, 48V models: 150mV max.
• Temperature Coefficient: ±0.03%/°C.
• Minimum Load: 20% of rated load (required for stable startup and operation).
• Standby Power: <1.0W @ 230VAC.
• Hold-up Time: Typ. 20ms @ 115VAC; Typ. 40ms @ 230VAC.

General Characteristics:

• Isolation Resistance: ≥100MΩ (tested at 500VDC, input-output/input-case/output-case).
• Operating & Storage Temperature: -30°C to +80°C (refer to derating curve for operation above +70°C).
• Operating & Storage Humidity: 20% to 90% RH (non-condensing).
• Switching Frequency: 75kHz (typical).
• Output Power Derating:
  • Temperature Derating: Required above +70°C up to +80°C.
  • Input Voltage Derating: Output power must be derated when input voltage is below 180VAC. Consult the derating curve.
• Over-Temperature Protection: Activates at approximately 100°C (case temperature) with automatic recovery.
• Cooling Fan: Built-in DC brushless fan with temperature-controlled operation (typically starts at ~50°C case temperature).

Physical & Mechanical Characteristics

• Enclosure Material: Metal.
• Dimensions: 199.00 x 110.00 x 50.00 mm (L x W x H).
• Weight: Typ. 1050g.
• Cooling Method: Built-in DC brushless fan, temperature-controlled.
• Output Voltage Adjustment: Adjustable via the onboard ADJ potentiometer (clockwise to increase).
• Installation: The protective earth terminal (PE, marked with the ground symbol) must be reliably connected to the system's protective earth (ground).
• Fan Replacement: The cooling fan is a consumable part. A replacement fan module (P/N: 40440001) is available and must be installed by qualified personnel.

Important Notes

1. All specifications are measured at 25°C ambient temperature, 230VAC input, and rated output load, unless otherwise stated.
2. Derating is required for high-altitude applications: above 2000m, the operating temperature must be derated.
3. A minimum load of 20% is required for stable startup and operation. Operating below this minimum may affect performance.
4. Ensure unobstructed airflow for the built-in fan. Maintain at least 50mm of clearance on the intake and exhaust sides.
5. The power supply is a component. Final system EMC, safety, and thermal performance must be validated in the end equipment. Refer to the application guide.
6. This power supply is designed for installation within end equipment. It is not a standalone device.
7. For customer-specific requirements (e.g., modified output voltage), please contact us.

Contact Email: Vic@feisman.cn