What is the minimum R1?
R1 is typically 240Ω to ensure the minimum load current (5mA) required for regulation is met.
Calculator
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Analysis
Interpretation of the current calculator output
Enter values to see detailed analysis and insights.
How to Use
Step-by-step instructions
- 1Enter the value of R1 (Ohms).
- 2Enter the value of R2 (Ohms).
- 3The calculator will show the output voltage.
Output Voltage
Calculates the output voltage based on the ratio of the two setting resistors. 1.25V is the internal reference voltage.
Vout = 1.25 × (1 + R2/R1)Variables:
R1Resistor 1 (typically 240Ω)R2Resistor 2 (sets voltage)Example
5V Supply
Inputs:
R1:240 Ω
R2:720 Ω
Steps:
- 1.Vout = 1.25 * (1 + 720/240)
- 2.Vout = 1.25 * (1 + 3)
- 3.Vout = 1.25 * 4 = 5V
Result:
5 V