LM35-23BxxR2S Series: AC/DC 35W Ultra-Compact Metal Enclosure Switching Power Supply

Product Overview

The LM35-23BxxR2S(-Q, -QQ) series represents a significant innovation in industrial metal enclosure power supply standards. Developed by MORNSUN, this ultra-compact second-generation product delivers a breakthrough in size, performance, craftsmanship, and structural design. It features a universal AC/DC input, high efficiency, high reliability, and excellent cost-effectiveness, making it an ideal power solution for a wide range of demanding applications.

Key Features

• Wide Input Range: Accepts 80 - 305VAC or 100 - 430VDC from the same input terminals.
• Extended Operating Temperature: Functions reliably from -40°C to +85°C.
• High Efficiency & Low Standby Power: Delivers high conversion efficiency with typical standby power below 0.5W at 230VAC.
• Robust Isolation & Protection: Features 4000VAC high isolation and comprehensive protections including short-circuit, over-current, and over-voltage (hiccup mode, auto-recovery).
• Enhanced Reliability: Exhibits low ripple & noise, is suitable for applications up to 5000 meters altitude, and offers a high MTBF of ≥300,000 hours per MIL-HDBK-217F at 25°C.
• Full Compliance: Meets Overvoltage Category III (per EN62477) and complies with major international safety and EMC standards including UL, IEC, EN, and CISPR32 Class B.

Product Selection Guide

This series includes multiple models to suit various voltage requirements. All models carry EN/CCC certification and are available in standard, conformal-coated (suffix -Q), and double-sided conformal-coated (suffix -QQ) versions.

• Model LM35-23B05R2S: Output 5V at 7A (35W). Adjustable from 4.75V to 6.75V. Typical efficiency 86.0% at 230VAC. Maximum capacitive load 8000 µF.
• Model LM35-23B12R2S: Output 12V at 3A (36W). Adjustable from 11.4V to 14.4V. Typical efficiency 86.5%. Maximum capacitive load 1500 µF.
• Model LM35-23B15R2S: Output 15V at 2.4A (36W). Adjustable from 14.25V to 17.25V. Typical efficiency 87.5%. Maximum capacitive load 1000 µF.
• Model LM35-23B24R2S: Output 24V at 1.5A (36W). Adjustable from 22.8V to 28.8V. Typical efficiency 88.5%. Maximum capacitive load 750 µF.
• Model LM35-23B36R2S: Output 36V at 1A (36W). Adjustable from 34.2V to 41.4V. Typical efficiency 88.5%. Maximum capacitive load 330 µF.
• Model LM35-23B48R2S: Output 48V at 0.8A (38.4W). Adjustable from 43.2V to 52.8V. Typical efficiency 89.5%. Maximum capacitive load 220 µF.
• Model LM35-23B54R2S: Output 54V at 0.67A (36W). Adjustable from 48.6V to 59.4V. Typical efficiency 89.5%. Maximum capacitive load 100 µF.

Detailed Technical Specifications

Input Characteristics

• Input Voltage Range: 80 – 305 VAC / 100 – 430 VDC.
• Input Frequency Range: 47 – 63 Hz.
• Inrush Current: Maximum 30A at 115VAC; 50A at 230VAC.
• Leakage Current: < 0.75 mA at 277VAC.
• Hot Swap: Not supported.

Output Characteristics

• Output Voltage Accuracy: ±2% for 5V model; ±1% for all other models (12V-54V).
• Line Regulation: ±0.5% (rated load).
• Load Regulation: ±1% for 5V model; ±0.5% for all other models (0%-100% load).
• Ripple & Noise (p-p, 20MHz): 5V/12V/15V models: 150mV max; 24V model: 150mV max; 36V/48V/54V models: 240mV max.
• Temperature Coefficient: ±0.03%/°C.
• Minimum Load: 0%.
• Hold-up Time: Typically 6ms at 115VAC; 35ms at 230VAC.
• Standby Power: ≤ 0.5W at 230VAC.
• Over-Current Protection: Hiccup mode, auto-recovery, triggered at 120% - 300% of rated current.
• Over-Voltage Protection: Clamping, auto-recovery. Thresholds: 5V≤7.3V, 12V≤16.2V, 15V≤21.75V, 24V≤33.6V, 36V≤48.6V, 48V≤60V, 54V≤70V.
• Short-Circuit Protection: Hiccup mode, allows long-term short, auto-recovery within 3s after fault clears.

General Specifications

• Isolation Voltage: Input-Output: 4000 VAC for 1 minute; Input-Case: 2000 VAC; Output-Case: 1250 VAC.
• Insulation Resistance: ≥100 MΩ at 500 VDC.
• Operating/Storage Temperature: -40°C to +85°C.
• Operating Humidity: 20% to 90% RH (non-condensing).
• Switching Frequency: Typically 90 kHz.
• Safety Standards: Complies with GB4943.1, BS EN/EN62368-1, UL/IEC62368-1, EN60335-1, EN61558-1, EN62477-1.
• Safety Class: Class I.
• Warranty: 3 years.

Physical & EMC Characteristics

• Enclosure: Metal (AL5052, SGCC).
• Dimensions: 99.00 x 65.00 x 30.00 mm (L x W x H).
• Weight: Approximately 150g.
• Cooling: Natural convection.
• EMI: Conforms to CISPR32/EN55032 Class B for both conducted and radiated emissions.
• EMS: Robust immunity per IEC/EN61000-4 series, including ESD (±6kV contact/±8kV air), EFT (±4kV), Surge (±2kV line-line/±4kV line-earth), RF fields (10V/m), and voltage dips/interruptions.

Applications

The LM35-23BxxR2S series is designed for high reliability in industrial environments and is widely used in:

• Industrial Controls
• Street Light Control Systems
• Security and Surveillance
• Telecommunications
• Smart Home Devices

Important Application Notes

1. For operation in harsh EMC environments, please refer to the application circuit guidelines.
2. Power derating is required: for input voltages between 80-100VAC/100-140VDC, and for ambient temperatures above +50°C or below -30°C. Please consult the datasheet for detailed curves.
3. For operation above 2000 meters altitude, derate operating temperature by 5°C per 1000 meters.
4. The product is designed for natural convection cooling. Consultation is required for use in sealed enclosures.
5. The output voltage can be adjusted via the ADJ potentiometer (clockwise to increase).
6. The metal casing must be connected to the system's protective earth (PE) in the end application.
7. The power supply should be treated as part of the system for final EMC validation.

Contact Information

MORNSUN Guangzhou Science & Technology Co., Ltd.
Address: No. 6, Nanyun 4th Road, Huangpu District, Guangzhou, China.
E-mail: Vic@feisman.cn