Compute the input voltage of 7805c voltage regulator with a current source that will deliver a 0.725A current to 65Ω, 10w load. (Assume reference voltage =5v)
(a) Vin = 84v
(b) Vin = 34v
(c) Vin = 54v
(d) Vin = 64v
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This key question is from IC Voltage Regulator topic in division Phase Locked Loops of Linear Integrated Circuits