current source,4-5A

Want to use the op amp to set up a constant current source with output current of 4-5A, the power supply of the op amp can be ± 12V or 5V. Is there any recommended circuit

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  • Hi Jack,

    To reccomend you a suiting circuit, you should specifying the following:

    - Do you only want sourcing positive current (or sinking current to ground)?
    - Is this current fixed (or adjustable)?
    - What accuracy / Stability you need?
    - How dynamic is your Load?
    - What is maximum voltage you need on the output?

    The standard method is, that you have a small shunt resistor and a transistor in the current path.
    And with the OP you regulate the transistor, hence the voltage drop on that shunt:
    With the OP you sense this shunt voltage and compare that to a reference voltage, that set your output current.

    In the internet you will probably find a lot of circuits.
    But if you specify the above and reply to this post in recenable time, I can reccomend a circuit for you.

Reply
  • Hi Jack,

    To reccomend you a suiting circuit, you should specifying the following:

    - Do you only want sourcing positive current (or sinking current to ground)?
    - Is this current fixed (or adjustable)?
    - What accuracy / Stability you need?
    - How dynamic is your Load?
    - What is maximum voltage you need on the output?

    The standard method is, that you have a small shunt resistor and a transistor in the current path.
    And with the OP you regulate the transistor, hence the voltage drop on that shunt:
    With the OP you sense this shunt voltage and compare that to a reference voltage, that set your output current.

    In the internet you will probably find a lot of circuits.
    But if you specify the above and reply to this post in recenable time, I can reccomend a circuit for you.

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