How to Use Ascent Vrx: Examples, Pinouts, and Specs

The Ascent Vrx by Walksnail is a high-performance voltage regulator designed to deliver a stable and reliable output voltage, even under varying load conditions. This component is essential for efficient power management in electronic circuits, ensuring that sensitive components receive a consistent voltage supply. Its robust design and precision make it suitable for a wide range of applications.

• Power supply regulation in embedded systems
• Voltage stabilization for microcontrollers and sensors
• Battery-powered devices requiring efficient power management
• Industrial and automotive electronics
• Consumer electronics such as portable devices and IoT gadgets

The following table outlines the key technical details of the Ascent Vrx:

The Ascent Vrx is available in two common package types: TO-220 and SOT-223. Below is the pin configuration for each package:

1. Input Voltage Connection: Connect the input voltage source (4.5V to 36V) to the VIN pin. Ensure the input voltage is within the specified range.
2. Output Voltage Adjustment: If the Ascent Vrx is adjustable, use an external resistor divider network to set the desired output voltage. Refer to the datasheet for the resistor values.
3. Ground Connection: Connect the GND pin to the circuit ground.
4. Output Load: Connect the load to the VOUT pin. Ensure the load does not exceed the maximum output current of 3A.
5. Capacitors: Place input and output capacitors close to the regulator pins to ensure stability. Typical values are:
   • Input capacitor: 10µF
   • Output capacitor: 22µF

• Thermal Management: For high-current applications, ensure proper heat dissipation using a heatsink (for TO-220) or a PCB thermal pad (for SOT-223).
• Protection Features: The Ascent Vrx includes built-in protection features, but avoid prolonged exposure to conditions like overcurrent or overheating.
• PCB Layout: Minimize the trace length between the input/output pins and the capacitors to reduce noise and improve stability.

The Ascent Vrx can be used to power an Arduino UNO by providing a stable 5V output. Below is an example circuit and Arduino code:

1. Connect a 9V battery to the VIN pin of the Ascent Vrx.
2. Adjust the output voltage to 5V using the resistor divider network.
3. Connect the VOUT pin to the Arduino UNO's 5V pin.
4. Connect the GND pin to the Arduino UNO's GND pin.

// Example code to blink an LED using Arduino UNO powered by Ascent Vrx
const int ledPin = 13; // Pin connected to the onboard LED

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

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

1. No Output Voltage

   • Cause: Input voltage is below the minimum required (4.5V).
   • Solution: Verify the input voltage and ensure it is within the specified range.

2. Overheating

   • Cause: Excessive load current or insufficient heat dissipation.
   • Solution: Reduce the load current or improve thermal management (e.g., add a heatsink).

3. Output Voltage Instability

   • Cause: Missing or incorrect capacitor values.
   • Solution: Ensure proper input and output capacitors are used as per the recommended values.

4. Short-Circuit Protection Triggered

   • Cause: Output pins are shorted.
   • Solution: Remove the short circuit and reset the regulator.

Q1: Can the Ascent Vrx be used with lithium-ion batteries?
A1: Yes, the Ascent Vrx can regulate voltage from lithium-ion batteries, provided the input voltage is within the 4.5V to 36V range.

Q2: What is the efficiency of the Ascent Vrx at low loads?
A2: The efficiency is typically lower at very light loads but can reach up to 95% at optimal load conditions.

Q3: Can I use the Ascent Vrx without a heatsink?
A3: For low-current applications, a heatsink may not be necessary. However, for currents approaching 3A, a heatsink or proper thermal management is recommended.

Q4: How do I calculate the resistor values for adjustable output voltage?
A4: Refer to the datasheet for the formula and recommended resistor values to set the desired output voltage.