Controlling current limits in current limiting circuits
摘要:
An example current limiting apparatus comprises a first transistor to carry a first current; a sense transistor coupled to the first transistor, the sense transistor to carry a sense current that is a function of the first current; a first amplifier coupled to the first transistor and the sense transistor, the amplifier to achieve a common voltage potential on terminals of the first and the sense transistors; a second amplifier coupled to the first amplifier and the sense transistor, the second amplifier to control the first and sense transistors based on the sense current; and a circuit coupled to the first and second amplifiers, the circuit to control an input to the second amplifier based on an input to the first amplifier such that a current limit of the first transistor remains below a programmed current limit of the first transistor.
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