How to Use SMPS_LRS-100-12: Examples, Pinouts, and Specs

The SMPS_LRS-100-12 is a high-efficiency Switch Mode Power Supply (SMPS) designed to convert AC mains voltage to a regulated 12V DC output. This power supply unit (PSU) is commonly used in a wide range of applications, including LED lighting systems, CCTV camera setups, industrial control systems, and other electronics that require a stable 12V DC power source.

• Model: LRS-100-12
• Output Power: 100W
• Output Voltage: 12V DC
• Output Current: 0 to 8.5A
• Input Voltage Range: 85 to 264V AC
• Efficiency: >87%
• Protection: Short circuit / Overload / Over voltage / Over temperature

1. AC Input Connection:

   • Connect the AC live wire to pin 1 (AC L) and the neutral wire to pin 2 (AC N).
   • Ensure that the input voltage matches the specified range (85 to 264V AC).

2. Grounding:

   • Connect the protective earth ground to pin 3 (FG) for safety.

3. DC Output Connection:

   • Connect your device's positive input to pin 5 (V+) and the negative input to pin 4 (V-).

• Ensure proper ventilation around the power supply for heat dissipation.
• Avoid overloading the power supply; operate within the rated current of 0 to 8.5A.
• Use appropriate wire gauge for AC input and DC output to handle the current without excessive voltage drop.
• Protect the power supply from dust and moisture to prevent short circuits and other failures.

• Power Supply Does Not Start:

  • Check AC input connections for proper voltage and secure connections.
  • Verify that the load does not exceed the power supply's maximum ratings.

• Output Voltage Fluctuations:

  • Ensure that the load is stable and within the power supply's capability.
  • Check for loose connections on the DC output terminals.

• Overheating:

  • Confirm that the power supply has adequate clearance for airflow.
  • Reduce the load if it is near the power supply's maximum rating.

Q: Can the SMPS_LRS-100-12 be used with an Arduino UNO? A: Yes, it can power an Arduino UNO and other peripherals as long as the total current draw is within the power supply's limits.

Q: What should I do if the power supply is making noise? A: Some noise can be normal, but excessive noise may indicate an overload or a failing component. Reduce the load and check for any signs of damage.

Q: Is it possible to adjust the output voltage? A: The LRS-100-12 model typically has a fixed output voltage of 12V DC. Refer to the manufacturer's datasheet for models with adjustable output.

// No specific code is required for powering an Arduino UNO with the SMPS_LRS-100-12.
// Simply connect the 12V output from the power supply to the VIN and GND pins on the Arduino.

void setup() {
  // Initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // Turn the LED on (HIGH is the voltage level)
  digitalWrite(LED_BUILTIN, HIGH);
  // Wait for a second
  delay(1000);
  // Turn the LED off by making the voltage LOW
  digitalWrite(LED_BUILTIN, LOW);
   // Wait for a second
  delay(1000);
}

Note: When using the SMPS_LRS-100-12 to power an Arduino UNO, ensure that the input voltage to the VIN pin does not exceed the recommended maximum for the board (6-20V). The 12V output from the SMPS is within this range.

For further assistance or more detailed information, please refer to the manufacturer's datasheet or contact technical support.