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How to Use MW LRS-50-3.3V: Examples, Pinouts, and Specs

Image of MW LRS-50-3.3VDesign with MW LRS-50-3.3V in Cirkit Designer

Introduction

The MW LRS-50-3.3V is a compact, low-cost switching power supply designed to convert AC voltage into a stable 3.3V DC output. This highly efficient power supply is ideal for powering low-voltage electronic devices and embedded systems. Its small form factor and reliable performance make it a popular choice for industrial automation, IoT devices, LED lighting, and other applications requiring a steady 3.3V DC power source.

Explore Projects Built with MW LRS-50-3.3V

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Image of Battery-Powered 18650 Li-ion Charger with USB Output and Adjustable Voltage Regulator: A project utilizing MW LRS-50-3.3V in a practical application
Battery-Powered 18650 Li-ion Charger with USB Output and Adjustable Voltage Regulator

This circuit is a battery management and power supply system that uses three 3.7V batteries connected to a 3S 10A Li-ion 18650 Charger Protection Board Module for balanced charging and protection. The system includes a TP4056 Battery Charging Protection Module for additional charging safety, a Step Up Boost Power Converter to regulate and boost the voltage, and a USB regulator to provide a stable 5V output, controlled by a push switch.

Open Project in Cirkit Designer

Common Applications

Technical Specifications

The MW LRS-50-3.3V is designed to deliver consistent performance under a wide range of operating conditions. Below are its key technical specifications:

Parameter Value
Input Voltage Range 85-264V AC / 120-370V DC
Output Voltage 3.3V DC
Output Current 10A
Output Power 33W
Efficiency 78%
Ripple and Noise ≤80mVp-p
Operating Temperature -30°C to +70°C
Dimensions (L x W x H) 99 x 82 x 30 mm
Weight 0.3 kg
Safety Standards UL62368-1, EN62368-1, IEC62368-1

Pin Configuration and Descriptions

The MW LRS-50-3.3V features screw terminal connections for input and output. Below is the pin configuration:

Pin Label Description
L AC Line Input (Live)
N AC Neutral Input
FG Frame Ground (Earth)
V+ DC Output Positive (+3.3V)
V- DC Output Negative (Ground)
V ADJ Output Voltage Adjustment (±10% of 3.3V)

Usage Instructions

How to Use the MW LRS-50-3.3V in a Circuit

  1. Input Connection: Connect the AC input terminals (L and N) to the mains power supply. Ensure the input voltage is within the specified range (85-264V AC).
  2. Output Connection: Connect the V+ and V- terminals to the load requiring a 3.3V DC power supply. Ensure the load does not exceed the maximum output current of 10A.
  3. Grounding: Connect the FG terminal to the earth ground for safety and to reduce electrical noise.
  4. Voltage Adjustment: If necessary, use the V ADJ potentiometer to fine-tune the output voltage within ±10% of 3.3V.

Important Considerations and Best Practices

Example: Powering an Arduino UNO

The MW LRS-50-3.3V can be used to power an Arduino UNO by stepping down the voltage to 3.3V. Below is an example of how to connect the power supply to the Arduino:

  1. Connect the V+ terminal of the power supply to the 3.3V pin on the Arduino UNO.
  2. Connect the V- terminal of the power supply to the GND pin on the Arduino UNO.
  3. Ensure the power supply is properly grounded using the FG terminal.

Here is a simple Arduino sketch to blink an LED while powered by the MW LRS-50-3.3V:

// This sketch blinks an LED connected to pin 13 of the Arduino UNO.
// Ensure the Arduino is powered by the MW LRS-50-3.3V power supply.

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output pin
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

Troubleshooting and FAQs

Common Issues and Solutions

  1. No Output Voltage

    • Cause: Incorrect input connections or no AC input.
    • Solution: Verify that the AC input is connected to the L and N terminals and that the mains power is on.

  2. Output Voltage Too Low or Too High

    • Cause: Misadjusted V ADJ potentiometer.
    • Solution: Use a small screwdriver to adjust the V ADJ potentiometer until the output voltage is 3.3V.

  3. Overheating

    • Cause: Insufficient ventilation or excessive load.
    • Solution: Ensure proper airflow around the power supply and reduce the load if it exceeds 10A.

  4. Noise or Ripple on Output

    • Cause: Poor grounding or interference from nearby devices.
    • Solution: Ensure the FG terminal is properly connected to earth ground and minimize interference from other devices.

FAQs

Q: Can the MW LRS-50-3.3V be used outdoors?
A: No, the power supply is not weatherproof. It should be used in a dry, indoor environment.

Q: Can I use this power supply to charge batteries?
A: The MW LRS-50-3.3V is not designed for battery charging. Use a dedicated battery charger for this purpose.

Q: What happens if the load exceeds 10A?
A: The power supply includes overload protection and will shut down temporarily to prevent damage. Reduce the load and restart the power supply.

Q: Is the output voltage adjustable?
A: Yes, the output voltage can be adjusted within ±10% of 3.3V using the V ADJ potentiometer.