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HW 3 a : Power Supply LTspice Design a resistor/LED circuit such that the diode will be brightly let when V out i s 5 volts. Assume the diode has a forward voltage of 3.65V and a forward current of 20mA, when the diode is brightly emitting light. Note: You need to round your resistors to a whole number, as you cannot purchase non - whole numbers resistors.

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Answer:

68 ohm

Explanation:

Output Voltage, Vout = 5 V

Forward voltage, Vf = 3.65 V

Forward current, If = 20 mA = 0.02 A

Let the resistance is R.

Use the formula

[tex]I_{f}=\frac{V_{out}-V_{f}}{R}[/tex]

[tex]0.02=\frac{5-3.65}{R}[/tex]

R = 67.5 ohm

R = 68 ohm ( approx.)

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