Product Overview

The MORNSUN LI20-20BxxPU Series is a cost-effective, green, and highly efficient 20W DIN rail mount power supply. Featuring a compact design (95.00 x 22.50 x 85.00 mm), light weight (typical 125g), and standard rail mounting, it saves valuable installation space. This power supply is engineered to provide a highly stable and noise-immune power source for industrial control equipment, machinery, and other demanding industrial environments. It is safe, reliable, and boasts excellent Electromagnetic Compatibility (EMC) performance. The design references major international safety standards including UL/EN/IEC/BS EN62368, UL61010, and UL508.

Key Features

• Wide Input Voltage Range: Accepts 85 - 264VAC or 120 - 370VDC input (universal AC/DC input terminals).
• High Robustness: Withstands up to 305VAC input for 3 seconds. Features a high isolation voltage of 4000VAC.
• High Altitude Operation: Suitable for applications up to 5000 meters.
• DC OK Signal: Provides a remote signal indicating output status.
• Comprehensive Protection: Provides output short-circuit, over-current, and over-voltage protection.
• High Efficiency: Up to 86% typical efficiency.
• Wide Operating Temperature: Operates from -30°C to +70°C.
• Standard Mounting: Easily mounts on TS35X7.5 or TS35X15 standard DIN rails.
• Safety & Compliance: Designed with reference to UL/IEC62368, UL61010, and UL508 standards. Certified to EN62368-1 and BS EN62368-1. The product is RoHS compliant.

Model Selection and Output Parameters

The LI20-20BxxPU series offers multiple output models with an adjustable output voltage range. Note: All EMC testing must be verified in combination with the end equipment. For EMC test guidance, please consult our FAE.

• Model LI20-20B05PU: Rated output 5V / 3.0A. Output power 15W. Output voltage adjustable range 4.75-5.5V. Typical efficiency (230VAC) 80%. Maximum capacitive load 7000µF.
• Model LI20-20B12PU: Rated output 12V / 1.67A. Output power 20W. Output voltage adjustable range 10.8-13.2V. Typical efficiency (230VAC) 83%. Maximum capacitive load 4000µF.
• Model LI20-20B15PU: Rated output 15V / 1.34A. Output power 20W. Output voltage adjustable range 13.5-16.5V. Typical efficiency (230VAC) 83%. Maximum capacitive load 3000µF.
• Model LI20-20B24PU: Rated output 24V / 1.0A. Output power 24W. Output voltage adjustable range 21.6-26.4V. Typical efficiency (230VAC) 86%. Maximum capacitive load 1000µF.

Detailed Specifications

Input Characteristics

• Input Voltage Range: 85 - 264VAC; 120 - 370VDC.
• Input Frequency: 47 - 63 Hz.
• Input Current (Max): 0.55A at 115VAC; 0.35A at 230VAC.
• Inrush Current (Max): 20A at 115VAC; 35A at 230VAC.
• Leakage Current (Max): <0.5mA at 240VAC.
• Hot Plug-in: Not supported.

Output Characteristics

• Output Voltage Accuracy (full load range): ±2% for 5V models; ±1% for 12V/15V/24V models.
• Line Regulation (rated load): Max ±1%.
• Load Regulation (230VAC input): Max ±1%.
• Ripple & Noise (p-p, 20MHz bandwidth, conventional method*): 5V: 60mV (Typ.) / 80mV (Max); 12V/15V: 100mV (Typ.) / 120mV (Max); 24V: 120mV (Typ.) / 150mV (Max). *See case switching power supply application guide for details.
• Temperature Coefficient: Max ±0.03%/°C.
• Hold-up Time: Typical 20ms at 115VAC; typical 50ms at 230VAC.
• DC OK Signal (within adjustable output range): 5V model: 3.75-6V / 50mA; 12V model: 9-13.5V / 40mA; 15V model: 11.5-16.5V / 40mA; 24V model: 18-27V / 20mA.
• Protection Features:
  • Over-Current Protection (OCP): >125% of Io, constant current mode, auto-recovery.
  • Short-Circuit Protection (SCP): Constant current mode, auto-recovery after fault removal.
  • Over-Voltage Protection (OVP) Point: 5V Model: ≤ 6.75V; 12V Model: ≤ 16.2V; 15V Model: ≤ 20.25V; 24V Model: ≤ 32.4V.
• Minimum Load: 0%.

General Characteristics

• Isolation Voltage (1 minute): Input-Output: 4000VAC; Input-Chassis: 2000VAC; Output-Chassis: 500VAC.
• Insulation Resistance (500VDC): Input-Output, Input-Chassis, Output-Chassis: ≥100 MΩ.
• Environmental:
  • Operating Temperature: -30°C to +70°C.
  • Storage Temperature: -40°C to +85°C.
  • Operating Humidity: 20 - 90% RH (non-condensing).
  • Storage Humidity: 10 - 95% RH (non-condensing).
• Derating:
  • Temperature Derating: From +50°C to +70°C, derate 2.5% per °C.
  • Input Voltage Derating: For inputs between 85-100VAC, derate 1.33% per VAC. For inputs between 85 - 100VAC/120 - 140VDC, voltage derating is required on top of temperature derating.
  • Altitude Derating: Above 2000 meters, derate 3.5°C per 1000 meters.
• Switching Frequency: Typical 65 kHz (230VAC, full load).
• Safety & Reliability: Safety Class I. Designed with reference to UL/EN/IEC/BS EN62368-1, UL61010-1, UL508, IS13252 (Part1). MTBF per MIL-HDBK-217F @25°C ≥300,000 hours.

Physical Characteristics

• Enclosure: Flame-retardant, heat-resistant plastic (UL94 V-0 rated).
• Dimensions: 95.00mm (L) x 22.50mm (W) x 85.00mm (H).
• Weight: Typical 125g.
• Cooling: Natural convection. Suitable for ventilated environments; for sealed applications, consult our FAE. For loads consistently over 50% of rated power, maintain clearance: top/bottom 20mm, sides 5mm (increase to 15mm near heat sources).
• Wiring: Input: 22~12 AWG; Output: 20~12 AWG. Max terminal torque 0.4 N·m.
• Pinout:
  1. +Vo (Output Positive)
  2. -Vo (Output Negative)
  3. DC OK (Output Status Indicator)
  4. AC(L) (Line)
  5. AC(N) (Neutral)
  6. Earth Symbol (Chassis Ground)
• Adjustment: Output voltage is increased by turning the "ADJ" screw clockwise.

EMC Characteristics

The product is designed to meet the following international EMC standards.

• Electromagnetic Interference (EMI):
  • Conducted Emission: Complies with CISPR32/EN55032 Class B.
  • Radiated Emission: Complies with CISPR32/EN55032 Class B.
  • Harmonic Current: Complies with IEC/EN61000-3-2 Class A.
• Electromagnetic Susceptibility (EMS):
  • Electrostatic Discharge (ESD): IEC/EN61000-4-2, Contact ±6kV / Air ±8kV, Performance Criteria A.
  • Radiated Immunity (RS): IEC/EN61000-4-3, 10V/m, Performance Criteria A.
  • Electrical Fast Transient (EFT): IEC/EN61000-4-4, ±2kV, Performance Criteria A.
  • Surge: IEC/EN61000-4-5, Line to Line ±2kV / Line to PE ±4kV, Performance Criteria A.
  • Conducted Immunity (CS): IEC/EN61000-4-6, 10V r.m.s., Performance Criteria A.
  • Power Frequency Magnetic Field (PFMF): IEC/EN61000-4-8, 30A/m, Performance Criteria A.
  • Voltage Dips & Interruptions: IEC/EN61000-4-11, 100% dip for 1 period, 30% dip for 25 periods (50Hz) / 30 periods (60Hz), Performance Criteria B.

Important Notes

1. All specifications are measured at 25°C ambient temperature, <75% RH humidity, rated input voltage, and rated output load, per the company's internal testing standards.
2. To improve conversion efficiency, slight audible noise may occur during high-voltage operation, which does not affect performance or reliability.
3. Product design is subject to change without notice. Contact us for customization inquiries.
4. The power supply should be considered part of the system. All EMC tests require confirmation with the end equipment.
5. At end of life, the product must be stored separately according to ISO14001 and relevant environmental regulations and handed over to qualified agencies for disposal.
6. For packaging details (packaging number: 58220672) and resources, please visit our website.

Contact Information

MORNSUN Guangzhou Science & Technology Co., Ltd.
Address: No.8, Nanyun 4th Road, Huangpu District, Guangzhou
Email: Vic@feisman.cn