AC/DC Converter - LS03-13BxxR3 Series

January 27, 2026

Product Overview
The LS03-13BxxR3 series is one of MORNSUN's highly efficient green power AC-DC converter series. They feature a wide input range accepting either AC or DC voltage, high reliability, low power consumption, and reinforced isolation. All models are particularly suitable for industrial control, electric power, instrumentation, and smart home applications which have high requirements for compact dimensions and do not have stringent EMC requirements. For extremely harsh EMC environments, it is recommended to use the application circuit shown in the Design Reference section of this datasheet.

Key Features

Ultra-wide input voltage range: 85 - 305VAC and 70 - 430VDC.
Accepts AC or DC input (dual-use of the same terminal).
Operating ambient temperature range: -40°C to +85°C.
Versatile for multiple applications with flexible layout.
Compact size, high power density, and green power design.
Controllable lifespan and adjustable cost.
Low no-load power consumption: 0.1W.
Protections: Output short circuit and over-current.
Designed to meet UL62368, IEC/EN60335, and IEC/EN61558 standards.

Selection Guide
The EN/IEC certified series includes the following models:

LS03-13B03R3: Output Power: 1.98W; Nominal Output: 3.3V / 600mA; Typical Efficiency at 230VAC: 67%; Maximum Capacitive Load: 820 uF.
LS03-13B05R3: Output Power: 3W; Nominal Output: 5V / 600mA; Typical Efficiency at 230VAC: 72%; Maximum Capacitive Load: 680 uF.
LS03-13B09R3: Output Power: 3W; Nominal Output: 9V / 333mA; Typical Efficiency at 230VAC: 76%; Maximum Capacitive Load: 470 uF.
LS03-13B12R3: Output Power: 3W; Nominal Output: 12V / 250mA; Typical Efficiency at 230VAC: 77%; Maximum Capacitive Load: 470 uF.
LS03-13B15R3: Output Power: 3W; Nominal Output: 15V / 200mA; Typical Efficiency at 230VAC: 78%; Maximum Capacitive Load: 330 uF.
LS03-13B24R3: Output Power: 3W; Nominal Output: 24V / 125mA; Typical Efficiency at 230VAC: 80%; Maximum Capacitive Load: 200 uF.

Notes:

The nominal output voltage refers to the voltage applied to the load terminal after adding external circuits.
If the product is used in a severe vibration application, it needs to be glued and fixed.
The product picture is for reference only. Please refer to the actual product for details.

Detailed Specifications
Input Specifications:

Input Voltage Range: AC Input: 85-305 VAC; DC Input: 70-430 VDC.
Input Frequency: 47-63 Hz.
Input Current (Max.): 0.12A at 115VAC; 0.06A at 230VAC.
Inrush Current (Typ.): 13A at 115VAC; 23A at 230VAC.
Recommended External Input Fuse: 1A, slow-blow, required (selection must be adapted to the specific application environment).
Hot Plug: Unavailable.

Output Specifications:

Output Voltage Accuracy: ±5% (at 10%-100% load).
Line Regulation: ±1.5% (rated load).
Load Regulation: ±3% (10%-100% load).
Ripple & Noise: 80 mVp-p (Typ.), 150 mVp-p (Max.), measured with 20MHz bandwidth (10%-100% load) using the “parallel cable” method. The product can work with a 0%-10% load with stable output.
Temperature Coefficient: ±0.15%/°C.
Standby Power Consumption: 0.10W (Typ.), 0.15W (Max.) at 230VAC.
Protections:
- Short Circuit: Hiccup mode, continuous, self-recovering.
- Over-current: Hiccup mode, self-recovering.
Minimum Load: 10%.

General, Safety & Mechanical Specifications:

Isolation (Input-Output): 3000 VAC for 1 min (leakage current <5mA).
Operating Temperature: -40°C to +85°C.
Storage Temperature: -40°C to +105°C.
Storage Humidity: Up to 95% RH.
Soldering Temperature: Wave-soldering: 260 ±5°C for 5-10s; Manual welding: 360 ±10°C for 3-5s.
Power Derating: Temperature: 2.5%/°C from +65°C to +85°C. Input Voltage: 1.33%/VAC from 85VAC-100VAC; 1%/VAC from 277VAC-305VAC.
Safety Standards: IEC/BS EN/EN62368-1 Safety Approval; design refers to UL62368-1, IEC/EN60335-1, IEC/EN61558-1.
Safety Class: CLASS II.
MTBF: >1,000,000 hours (MIL-HDBK-217F @25°C).
Dimensions: 26.40 x 12.58 x 11.00 mm.
Weight: 3.5g (Typical).
Cooling Method: Free air convection.

EMC Performance & Design Reference
EMC Performance: The product's emissions and immunity performance depends on the selected external application circuit.

Emissions: Can achieve CISPR32/EN55032 Class A (using Application Circuit 1 or 4) or Class B (using Application Circuit 2 or 3) for both Conducted (CE) and Radiated (RE) Emissions.
Immunity: Complies with IEC/EN61000-4-2 (ESD, ±6kV Contact, Criteria B), -4-3 (RS, 10V/m, Criteria A), -4-4 (EFT, ±2kV or ±4kV depending on circuit, Criteria B), -4-5 (Surge, ±1kV or ±2kV depending on circuit, Criteria B), -4-6 (CS, 10V, Criteria A), and -4-11 (Voltage dips, Criteria B).

Application Circuits & Component Selection:
The datasheet provides four recommended application circuits tailored for different environments and EMC requirements (Basic, Indoor Civil, Indoor Industrial, Outdoor General). Each circuit specifies required external components (FUSE, R1, LDM, CX, C1, C2, L1, C3, C4, CY, TVS) with detailed values and selection notes. For example:

Basic Application (Circuit 1): For -40°C to +85°C, Immunity Level 3, Emissions Class A. Requires FUSE (1A/300V), wire-wound resistor R1 (12Ω/3W), and inductor LDM (1.2mH).
Component Note: C1 is a required input filter capacitor. C3 is recommended to be a low-ESR electrolytic capacitor. A TVS diode (rated 1.2 times the output voltage) is recommended for protection.

Characteristic Curves & Notes:
The product includes Temperature Derating and Input Voltage Derating curves. Please note:

For AC input between 85-100VAC/277-305VAC or DC input between 70-120VDC/390-430VDC, output power must be derated according to the temperature derating curves.
Suitable for natural air cooling; for closed environments, consult MORNSUN FAE.

Contact for Support
For technical inquiries or further information, please contact: Vic@feisman.cn

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