MEAN WELL LRS-50 Series: 50W Single Output Switching Power Supply

Description

The LRS-50 series comprises 50W single-output enclosed type power supplies featuring a low profile design of 30mm. These units accept a universal AC input range of 85-264VAC and offer output voltages from 3.3V to 48V. With high efficiency up to 90%, the LRS-50 series utilizes a metallic mesh case for enhanced heat dissipation, allowing operation from -30°C to 70°C under free air convection without a fan. They deliver extremely low no-load power consumption (less than 0.3W), enabling end systems to meet global energy requirements. The series includes complete protection functions and 5G anti-vibration capability, complying with international safety regulations such as TUV BS EN/EN62368-1, BS EN/EN60335-1, BS EN/EN61558-1/-2-16, UL62368-1, and GB 4943.1. The LRS-50 series is positioned as a high price-to-performance power supply solution for various industrial applications.

Key Features

Universal AC input / Full range
Withstand 300VAC surge input for 5 seconds
No load power consumption <0.3W
Miniature size and 1U low profile
High operating temperature up to 70°C
Protections: Short circuit / Overload / Over voltage
Cooling by free air convection
Compliance to IEC/BS EN/EN 60335-1 (PD3) and IEC/BS EN/EN61558-1, -2-16 for household appliances
Operating altitude up to 5000 meters
Withstand 5G vibration test
High efficiency, long life, and high reliability
LED indicator for power on
Over voltage category III
100% full load burn-in test
3 years warranty

Applications

Industrial automation machinery
Industrial control system
Mechanical and electrical equipment
Electronic instruments, equipment, or apparatus
Household appliances

Specifications

Model	LRS-50-3.3	LRS-50-5	LRS-50-12	LRS-50-15	LRS-50-24	LRS-50-36	LRS-50-48
DC VOLTAGE	3.3V	5V	12V	15V	24V	36V	48V
RATED CURRENT	10A	10A	4.2A	3.4A	2.2A	1.45A	1.1A
CURRENT RANGE	0~10A	0~10A	0~4.2A	0~3.4A	0~2.2A	0~1.45A	0~1.1A
RATED POWER	33W	50W	50.4W	51W	52.8W	52.2W	52.8W
RIPPLE & NOISE (max.) Note.2	80mVp-p	80mVp-p	120mVp-p	120mVp-p	150mVp-p	200mVp-p	200mVp-p
OUTPUT VOLTAGE ADJ. RANGE	2.97~3.6V	4.5~5.5V	10.2~13.8V	13.5~18V	21.6~28.8V	32.4~39.6V	43.2~52.8V
VOLTAGE TOLERANCE Note.3	±3.0%	±2.0%	±1.0%	±1.0%	±1.0%	±1.0%	±1.0%
LINE REGULATION Note.4	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
LOAD REGULATION Note.5	±2.0%	±1.0%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
SETUP, RISE TIME	1000ms, 30ms/230VAC; 2000ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.)	30ms/230VAC; 12ms/115VAC at full load
VOLTAGE RANGE	85~264VAC; 120~373VDC
FREQUENCY RANGE	47~63Hz
EFFICIENCY (Typ.)	80%	83%	86%	88%	88%	89%	90%
AC CURRENT (Typ.)	0.95A/115VAC	0.56A/230VAC
INRUSH CURRENT (Typ.)	COLD START 45A/230VAC
LEAKAGE CURRENT	<0.75mA/240VAC

Protection

Over Load

110~150% rated output power. Protection type: Hiccup mode, recovers automatically after fault condition is removed.

Over Voltage

3.8~4.45V (for 3.3V), 5.9~7.3V (for 5V), 13.8~17.2V (for 12V), 18.75~25.75V (for 15V), 28.8~36.6V (for 24V), 41.4~51.6V (for 36V), 55.2~67.8V (for 48V). Protection type: Shut down o/p voltage, re-power on to recover.

Environment

Working Temp.

-30~+70°C (Refer to "Derating Curve")

Working Humidity

20~90% RH non-condensing

Storage Temp., Humidity

-40~+85°C, 10~95% RH non-condensing

Temp. Coefficient

±0.03%/°C (0~50℃)

Vibration

10~500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes

Safety & EMC

Over Voltage Category

III; Compliance to BS EN/EN61558, BS EN/EN50178, BS EN/EN60664-1, BS EN/EN62477-1; altitude up to 2000 meters

Safety Standards

UL62368-1, TUV BS EN/EN62368-1, BS EN/EN60335-1, BS EN/EN61558-1/-2-16, GB 4943.1, BSMI CNS15598-1, EAC TP TC 004, AS/NZS 60950.1(by CB), KC K60950-1(for LRS-50-12/24 only), BIS IS13252(Part1): 2010/IEC 60950-1: 2005(NOTE 10) approved

Withstand Voltage

I/P-O/P:4KVAC; I/P-FG:2KVAC; O/P-FG:1.25KVAC

Isolation Resistance

I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25°C/70% RH

EMC Emission

Compliance to BS EN/EN55032 (CISPR32) Class B, BS EN/EN55014, BS EN/EN61000-3-2,-3, GB17625.1, GB/T 9254.1, BSMI CNS15936, EAC TP TC 020, KC KN32, KN35(for LRS-50-12/24 only)

EMC Immunity

Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN61000-6-2 (BS EN/EN50082-2), BS EN/EN55035, heavy industry level, EAC TP TC 020, KC KN32, KN35(for LRS-50-12/24 only)

Others

MTBF

3149.8K hrs min. Telcordia SR-332 (Bellcore); 561.6Khrs min. MIL-HDBK-217F (25℃)

Dimension

99*82*30mm (L*W*H)

Packing

0.21Kg; 60pcs/14Kg/0.93CUFT

Notes:

All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25°C of ambient temperature.
Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
Tolerance: includes set up tolerance, line regulation and load regulation.
Line regulation is measured from low line to high line at rated load.
Load regulation is measured from 0% to 100% rated load.
Length of set up time is measured at cold first start. Turning ON/OFF the power supply very quickly may lead to increase of the set up time.
3.3V,5V when the load factor 0~50%, the switching power less is reduced by burst operation, which will cause ripple and ripple noise to go beyond the specifications.
The ambient temperature derating of 5°C/1000m is needed for operating altitude greater than 2000m(6500ft).
The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to "EMI testing of component power supplies." (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
Some models may not have the BIS logo, please contact your MEAN WELL sales for more information.

Model Encoding

The model encoding follows the pattern: LRS-50 - [Output Voltage]. For example, LRS-50-3.3 represents a 50W power supply with a 3.3V output voltage.

Diagrams and Characteristics

Block Diagram

The block diagram illustrates the internal components and signal flow of the power supply. Input power (I/P) is processed through an EMI filter, followed by rectifiers and a filter. This stage connects to the power switching circuitry, which is managed by a control circuit incorporating Overload Protection (O.L.P.) and Over Voltage Protection (O.V.P.). The output stage includes rectifiers and a detection circuit before delivering power to the output terminals (+V, -V).

Derating Curve

The Derating Curve graphically represents the relationship between Load (%) and Ambient Temperature (°C). It indicates that as the ambient temperature increases, the maximum allowable load must be reduced (derated) to maintain reliable operation. Specific derating lines are shown for 100VAC and 230VAC input voltages, with a note that 100VAC input is applicable only for 5V models.

Static Characteristics

The Static Characteristics graph illustrates the Load (%) in relation to the Input Voltage (VAC) at 60Hz. This chart demonstrates the stable output load capability across the specified input voltage range, from 85VAC to 264VAC.

Mechanical Specification

The LRS-50 series power supplies have a compact enclosure with dimensions of 99mm (Length) x 82mm (Width) x 30mm (Height). The unit features mounting holes for secure installation. The terminal pin assignments are as follows:

Pin No.	Assignment	Pin No.	Assignment
1	AC/L	4	DC OUTPUT -V
2	AC/N	5	DC OUTPUT +V
3	FG

Installation Manual

For detailed installation instructions, please refer to the official MEAN WELL manual: http://www.meanwell.com/manual.html

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