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Does on-resistance in forward direction constant in switching diode?

Latest Updated:11/01/2007

Question:

Is the on-resistance of the forward direction constant in a switching diode?

Answer:

No, the larger the forward current, the smaller the on-resistance. If the resistance were constant, the V-I characteristic would be a straight line, but in a diode, I increases exponentially as V increases. Since the resistance is V/I, the fact that the tangent (I/V) of the V-I characteristic curve forms a steep slope means that the resistance becomes lower.

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