The current sensor has an output for providing an over current signal to an input of a control circuit during a time that the circuit is sinking current from a load and also during a time when the circuit is sourcing {HEAD ~ current} to {TAIL ~ the load} 
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The current sensor has an output for providing an over current signal to an input of a control circuit during a time that the circuit is sinking current from a load and also during a time when the circuit is sourcing { HEAD ~ current } to { TAIL ~ the load }
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