AC/DC 90W Enclosed Switching Power Supply - LM90-20Axx Series

21 de enero de 2026

Features

Specialized power supply for the laser galvanometer industry.
Universal 85-264VAC or 120-370VDC input voltage range.
Accepts AC or DC input (dual-use of the same terminals).
Wide operating ambient temperature range: -30°C to +70°C.
High I/O isolation test voltage up to 4000VAC.
High efficiency with low ripple and noise.
Comprehensive protection: output short circuit, over-current, and over-voltage.
Suitable for operation at altitudes up to 5000 meters.
3-year warranty.

Overview
The LM90-20Axx series is one of MORNSUN’s dual-output, non-isolated, enclosed AC-DC switching power supplies. It features universal AC input while simultaneously accepting DC input voltage. This series is cost-effective, highly efficient, and reliable, featuring double or reinforced insulation. These converters provide excellent EMC performance, complying with IEC/EN61000-4 and CISPR32/EN55032 standards. They are not only designed for the professional laser galvanometer industry but are also widely used in current sensors, motors, and other fields.

Selection Guide
The series includes the following models:

LM90-20A15: EN/BIS certified, air-cooled, 90W output power. Provides +15V at 3000mA and -15V at 3000mA. The output voltage adjustable range for Vo1 is 13.5-16.5V. Typical efficiency at 230VAC is 86%. Maximum capacitive loads are 5000uF and 3000uF.
LM90-20A24: EN/BIS certified, air-cooled, 90W output power. Provides +24V at 1875mA and -24V at 1875mA. The output voltage adjustable range for Vo1 is 21.6-26.4V. Typical efficiency at 230VAC is 88%. Maximum capacitive loads are 2200uF and 1500uF.

Notes:

Product images are for reference only. Please refer to the actual product for details.
Under any steady-state conditions, the total power must not exceed the rated power. When increasing the output voltage, the total output power cannot exceed the rated power. When decreasing the output voltage, the output current cannot exceed the rated current.

Input Specifications

Input Voltage Range: AC: 85-264VAC (Rated/Certified: 100-240VAC); DC: 120-370VDC.
Input Frequency: 47-63 Hz (Rated: 50-60 Hz).
Input Current: Maximum 3A at 115VAC; 2A at 230VAC.
Inrush Current: Typically 30A (115VAC cold start); 60A (230VAC).
Start-up Delay Time: Maximum 1 second at rated load.
Input Fuse: Built-in, 4A.
Hot Plug: Unavailable.

Output Specifications

Output Voltage Accuracy: Vo1: ±1%; Vo2: ±3%.
Line Regulation: Vo1: ±1%; Vo2: ±1.5%.
Load Regulation: Vo1: ±1%; Vo2: ±3%.
Cross Regulation: Maximum 10%.
Minimum Load: 10% (balanced load).
Ripple & Noise: Typically 100mVp-p for both Vo1 and Vo2 (20MHz bandwidth, balanced load). Measured using the "Tip and barrel method" with a 47uF electrolytic and 0.1uF ceramic capacitor in parallel at the output.
Temperature Coefficient: ±0.03%/°C.
Hold-up Time: Typically 8ms (115VAC); 20ms (230VAC).
Protections:
- Short Circuit: Hiccup mode, continuous, self-recovering (recovers within <3s after fault removal).
- Over-current: ≥120% Iout, hiccup mode, self-recovering.
- Over-voltage: For 15V output ≤22V; for 24V output ≤33.6V (both hiccup mode, self-recovering).

General Specifications

Isolation: Input-Output: 4000VAC for 1 min; Input-Chassis: 2000VAC; Output-Chassis: 500VAC.
Insulation Resistance: ≥50 MΩ (500VDC, 25±5°C, <95%RH non-condensing).
Operating Temperature: -30°C to +70°C.
Storage Temperature: -40°C to +85°C.
Operating/Storage Humidity: 95% RH / 75% RH (non-condensing).
Switching Frequency: Typical 65 kHz.
Derating: 2.5%/°C from +50°C to +70°C; 2%/VAC from 85VAC to 100VAC; 5°C/Km for altitude from 2000m to 5000m.
Leakage Current: Touch current <0.5mA at 240VAC/60Hz.
Safety Standards: EN/BS EN62368-1 (report), IS13252 (Part1) safety approved; design refers to UL62368-1. Safety Class: CLASS I.
MTBF: ≥300,000 hours (MIL-HDBK-217F @25°C).
Warranty: 3 years (ambient temperature <70°C).
Case Material: Metal (AL1100, 9GCC).
Dimensions: 129.00 x 97.00 x 30.00 mm.
Weight: 305g (Typical).
Cooling Method: Air cooling.

Environmental & EMC Specifications

Environmental Tests: Conforms to GB2423/IEC60068-2 standards for high/low temperature operation/storage, vibration, and termination robustness.
EMC Emissions: Complies with CISPR32/EN55032 CLASS A for Conducted and Radiated Emissions; IEC/EN61000-3-2 CLASS A for Harmonics.
EMC Immunity: Complies with multiple IEC/EN61000-4 standards: ESD (Contact ±6kV/Air ±8kV), RS (10V/m), EFT (±4kV), Surge (Line-Line ±2kV/Line-PE ±4kV), CS (10V), MS (30A/m), and voltage dips/interruptions (Performance Criteria A).

Product Characteristic Curves & Application Notes
The product features derating curves for Input Voltage vs. Output Power and Temperature vs. Output Power. Efficiency curves vs. Input Voltage and Output Load are available. It is suitable for natural air-cooled applications. For use in closed environments, please consult MORNSUN FAE.

Dimensions
Detailed mechanical drawings with dimensions are provided in the datasheet.

Contact Information
For further technical support or inquiries, please contact: Vic@feisman.cn

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