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Practical H-Bridge Current Monitor Offers Fault Detection and Bidirectional Load Information

Limited Performance H-Bridge Current Monitor

This circuit shows a differential load measurement for an ADC using twin unidirectional sense measurements. Each LTC6101 performs high side sensing that rapidly responds to fault conditions, including load shorts and MOSFET failures. Hardware local to the switch module (not shown in the diagram) can provide the protection logic and furnish a status flag to the control system. The two LTC6101 outputs taken differentially produce a bidirectional load measurement for the control servo. The ground-referenced signals are compatible with most delta sigma ADCs.


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