How to Use NPS4069EVB: Examples, Pinouts, and Specs

The NPS4069EVB is an evaluation board developed by Nexperia to demonstrate the capabilities of the NPS4069, a high-efficiency, low-power buck converter. This evaluation board is designed to simplify the testing and evaluation of the NPS4069 in various applications, such as power management systems, battery-powered devices, and industrial electronics. It features adjustable output voltage and current capabilities, making it a versatile tool for engineers and designers.

• Power supply for microcontrollers and low-power devices
• Battery-powered systems
• Industrial control systems
• Consumer electronics
• Prototyping and testing of DC-DC conversion circuits

• Input Voltage Range: 4.5 V to 40 V
• Output Voltage Range: Adjustable from 0.8 V to 15 V
• Output Current: Up to 2 A
• Switching Frequency: 500 kHz (typical)
• Efficiency: Up to 90% (depending on load and input/output conditions)
• Operating Temperature Range: -40°C to +125°C
• Dimensions: Compact PCB layout for easy integration

The NPS4069EVB features several key pins and connectors for input, output, and control. The table below provides a detailed description of each pin:

1. Power Supply Connection:

   • Connect the input voltage (4.5 V to 40 V) to the VIN terminal (J1).
   • Connect the ground of the power source to the GND terminal (J2).

2. Load Connection:

   • Connect the load to the VOUT terminal (J3).
   • Ensure the load does not exceed the maximum output current of 2 A.

3. Enable the Converter:

   • Use the EN pin (J4) to enable or disable the converter. Apply a logic HIGH (e.g., 3.3 V or 5 V) to enable the device.

4. Adjust Output Voltage:

   • Use the VOUT Adjust jumper (JP1) to set the desired output voltage.
   • For fine-tuning, connect external resistors to the appropriate test points.

5. Monitor Performance:

   • Use the test points (TP1 and TP2) to monitor the input and output voltages with a multimeter or oscilloscope.

• Ensure the input voltage is within the specified range (4.5 V to 40 V) to avoid damaging the board.
• Do not exceed the maximum output current of 2 A to prevent overheating or failure.
• Use proper heat dissipation techniques if operating at high loads for extended periods.
• When adjusting the output voltage, verify the settings with a multimeter before connecting sensitive loads.
• Always follow proper ESD precautions when handling the evaluation board.

The NPS4069EVB can be used to power an Arduino UNO by providing a stable 5 V output. Below is an example of how to configure the board:

1. Set the output voltage to 5 V using the VOUT Adjust jumper.
2. Connect the VOUT terminal (J3) to the Arduino's 5 V pin.
3. Connect the GND terminal (J2) to the Arduino's GND pin.

Here is a simple Arduino sketch to blink an LED while powered by the NPS4069EVB:

// Simple LED Blink Example
// This sketch blinks an LED connected to pin 13 of the Arduino UNO.
// Ensure the NPS4069EVB is providing a stable 5 V to the Arduino.

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

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
}

1. No Output Voltage:

   • Verify that the input voltage is within the specified range (4.5 V to 40 V).
   • Check if the EN pin is set to logic HIGH to enable the converter.
   • Ensure the load is properly connected to the VOUT terminal.

2. Overheating:

   • Ensure the load does not exceed the maximum output current of 2 A.
   • Check for proper ventilation and consider adding a heatsink if necessary.

3. Output Voltage is Incorrect:

   • Verify the VOUT Adjust jumper settings and external resistor values.
   • Use a multimeter to measure the output voltage and adjust as needed.

4. Board is Not Powering the Load:

   • Check all connections to ensure they are secure.
   • Verify that the load is within the board's power capabilities.

Q1: Can the NPS4069EVB be used with a battery as the input source?
A1: Yes, the board can be powered by a battery as long as the input voltage is within the range of 4.5 V to 40 V.

Q2: How do I adjust the output voltage precisely?
A2: Use the VOUT Adjust jumper and connect external resistors to fine-tune the output voltage. Refer to the datasheet for resistor value calculations.

Q3: Is the board protected against short circuits?
A3: The NPS4069 includes built-in protection features, but it is recommended to avoid intentional short circuits to prevent damage.

Q4: Can I use the board for currents higher than 2 A?
A4: No, the maximum output current is 2 A. Exceeding this limit may damage the board or reduce its lifespan.