AC/DC 35W Metal Enclosed Switching Power Supply LM35-20Bxx (-Q) Series
- MORNSUN POWER
- Jan 15
- 3 min read
Product Overview
The LM35-20Bxx series is a full-featured, cost-effective metal enclosed switching power supply designed for a wide range of applications. It features a universal input voltage range, suitability for both AC and DC input, high efficiency, low standby power consumption, and high reliability with excellent safety isolation. These products offer outstanding EMC performance and comply with key international safety standards including IEC/EN62368-1, CISPR32/EN55032 Class B, UL/IEC62368-1, IEC/EN60335-1, GB4943.1, and IEC/EN61558. They are widely used in industrial controls, LED lighting, street light control, security systems, telecommunications, and smart home devices.
Key Features
Universal Input: Wide input voltage range of 85 - 264VAC / 120 - 370VDC (same terminal).
High Efficiency & Low Standby Power: Typical efficiency up to 88%.
Extended Operating Temperature: Reliable performance from -30°C to +70°C.
High Isolation: Reinforced insulation with 4000VAC isolation voltage.
Robust Protection: Built-in protection against output short circuit, overload, and overvoltage.
Comprehensive Safety: Compliant with Overvoltage Category III (per EN62477).
High Altitude Operation: Certified for applications up to 5000 meters.
Model Selection GuideAll models in the LM35-20Bxx series are certified to EN and CCC standards. The series includes the standard models and an enhanced "Q" variant (LM35-20Bxx-Q) with conformal coating for protection against moisture, dust, and corrosion.
Model LM35-20B05: Output Power 35W. Rated Output 5VDC at 7A. Adjustable output range from 4.5V to 5.5V. Typical efficiency 86% at 230VAC. Maximum capacitive load at room temperature: 8000µF.
Model LM35-20B12: Output Power 36W. Rated Output 12VDC at 3A. Adjustable output range from 10.2V to 13.8V. Typical efficiency 87% at 230VAC. Maximum capacitive load at room temperature: 1500µF.
Model LM35-20B15: Output Power 36W. Rated Output 15VDC at 2.4A. Adjustable output range from 13.5V to 18V. Typical efficiency 88% at 230VAC. Maximum capacitive load at room temperature: 1000µF.
Model LM35-20B24: Output Power 36W. Rated Output 24VDC at 1.5A. Adjustable output range from 21.6V to 28.8V. Typical efficiency 88% at 230VAC. Maximum capacitive load at room temperature: 750µF.
Detailed Specifications
Input Characteristics
Input Voltage Range: 85 - 264 VAC; 120 - 370 VDC.
Input Frequency Range: 47 - 63 Hz.
Input Current: Maximum 0.8A at 115VAC; Maximum 0.6A at 230VAC.
Inrush Current: Maximum 30A at 115VAC (cold start); Maximum 50A at 230VAC.
Leakage Current: Less than 0.75 mA at 240VAC.
Hot Plug-in: Not supported.
Output Characteristics
Output Voltage Accuracy: ±2% for 5V output; ±1% for 12V, 15V, 24V outputs.
Line Regulation: ±0.5% (typical).
Load Regulation: ±1% for 5V output; ±0.5% for 12V, 15V, 24V outputs (from 0% to 100% load).
Ripple & Noise (P-P, 20MHz BW): 80mV for 5V; 120mV for 12V/15V; 150mV for 24V.
Temperature Coefficient: ±0.03%/°C.
Minimum Load: 0%.
Hold-up Time: 8ms at 115VAC; 30ms at 230VAC.
Short Circuit Protection: Hiccup mode, self-recovering.
Over Current Protection (OCP): Self-recovering, triggers at 120% to 200% of rated current.
Over Voltage Protection (OVP): Self-recovering hiccup mode. Thresholds: ≤6.75VDC for 5V model; ≤16.2VDC for 12V model; ≤21.75VDC for 15V model; ≤33.6VDC for 24V model.
General Characteristics
Isolation Voltage: 4000VAC input to case; 2000VAC input to output; 1250VAC output to case.
Insulation Resistance: ≥100 MΩ.
Operating Temperature: -30°C to +70℃ (with derating above 50°C).
Storage Temperature: -40°C to +85℃.
Operating & Storage Humidity: 20% to 95% RH, non-condensing.
Switching Frequency: 65 kHz (typical).
Safety Standards: Compliant with BS EN/EN62368-1, GB4943.1, IS13252 (Part1), EN60335-1, EN61558-1; conforms to UL/IEC62368-1, IEC60335-1, IEC61558-1.
MTBF: ≥300,000 hours per MIL-HDBK-217F at 25°C.
Warranty: 3 years at case temperature <70℃.
Physical & EMC Characteristics
Enclosure: Metal (AL1100, SGCC).
Dimensions: 99.0 x 82.0 x 30.0 mm (L x W x H).
Weight: 155g typical.
Cooling Method: Natural convection (fanless).
EMI/EMS: Conforms to CISPR32/EN55032 Class B for conducted and radiated emissions. Compliant with IEC/EN61000-4-2 (ESD), IEC/EN61000-4-3 (RF immunity), IEC/EN61000-4-4 (EFT), IEC/EN61000-4-5 (Surge), IEC/EN61000-4-6 (conducted RF), IEC/EN61000-4-8 (magnetic field), and voltage dip/interrupt standards.
Mechanical & Installation Data
Pinout (5-pin terminal):
AC Line (L)
AC Neutral (N)
Earth Ground (FG)
-Vo (Output Negative)
+Vo (Output Positive)
Mounting: Use M3 screws with a maximum length of 5mm for side holes (positions ②-③) and 3mm for top/bottom holes (positions ⑤-⑦). Recommended tightening torque is 0.4 N·m ±10%.
Wiring: Recommended wire gauge 22-12 AWG.
Output Adjustment: The output voltage can be fine-tuned via the ADJ potentiometer (clockwise to increase).
Important Note: The power supply case must be connected to the system earth ground (FG). For use in enclosed environments or specific EMC application guidance, please contact our technical support.
For more information, product customization inquiries, or technical support, please contact us via email at Vic@feisman.cn.
MORNSUN Guangzhou Science & Technology Co., Ltd.