Linear Regulator Calculation Calculator

Linear Regulator Equation:

\[ V_{out} = V_{ref} \times (1 + \frac{R2}{R1}) \]

Output Voltage (V_out):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Linear Regulator Equation?

The Linear Regulator equation calculates the output voltage of a linear voltage regulator based on the reference voltage and the ratio of two external resistors. This fundamental equation is essential for designing and analyzing linear regulator circuits.

2. How Does the Calculator Work?

The calculator uses the Linear Regulator equation:

\[ V_{out} = V_{ref} \times (1 + \frac{R2}{R1}) \]

Where:

\( V_{out} \) — Output voltage (volts)
\( V_{ref} \) — Reference voltage (volts)
\( R2 \) — Feedback resistor (ohms)
\( R1 \) — Ground resistor (ohms)

Explanation: The equation demonstrates how the output voltage is determined by the reference voltage and the resistor ratio, which sets the feedback network gain.

3. Importance of Linear Regulator Calculation

Details: Accurate voltage regulation calculation is crucial for designing stable power supplies, ensuring proper circuit operation, and preventing damage to sensitive electronic components.

4. Using the Calculator

Tips: Enter reference voltage in volts, and both resistor values in ohms. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical reference voltage value?
A: Typical reference voltages range from 1.2V to 5V, depending on the specific linear regulator IC being used.

Q2: How do I choose appropriate resistor values?
A: Choose resistor values that provide sufficient current through the feedback network while minimizing power dissipation. Values in the 1kΩ to 100kΩ range are commonly used.

Q3: Can this equation be used for adjustable regulators?
A: Yes, this equation is specifically designed for adjustable linear regulators that use external resistors to set the output voltage.

Q4: What are the limitations of this equation?
A: This equation assumes ideal regulator behavior and doesn't account for factors like regulator dropout voltage, temperature effects, or load regulation.

Q5: How accurate is this calculation?
A: The calculation provides the theoretical output voltage. Actual performance depends on resistor tolerance, regulator accuracy, and other circuit conditions.