Current sensing and control for a transistor power switch
摘要:
An apparatus includes: a first power transistor having a first current conduction path coupled between an input for receiving a supply voltage and a node and a first gate terminal coupled to a first gate control signal; a second power transistor having a second current conduction path coupled between the node and an output terminal for supplying a load current to a load; and a second gate terminal coupled to a second gate control signal; and a current sense transistor having a third gate terminal coupled to the first gate control signal, and outputting a sense current. The apparatus further includes: a differential amplifier having an output signal, and a feedback transistor having a gate terminal coupled to the output signal of the differential amplifier; and a resistor coupled between a monitor node and ground.
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