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Isolator-Feedback Circuit

Category: Datasheet/Specs
Product Number: ADum4190

Hello Everyone

I want to design a feedback circuit for ADum4190, the input would be the duty cycle voltage from my circuit board. I want to build a curcuit which when the voltages drop to zero does not shut down the system as the input voltage range for ADum is 0.35 to 1.5V. If this voltage drops to zero how can i design a circuit so that the feedback circuit react and keep it in the power mode?