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TI Home » TI E2E Community » Support Forums » Amplifiers » /etc... Amplifiers & Other Linear » /etc... Amplifiers & Other Linear Forum » how to drive TI op amp to sink current ?
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how to drive TI op amp to sink current ?

how to drive TI op amp to sink current ?

This question is answered
David Zhang16358
Posted by David Zhang16358
on Mar 29 2011 12:29 PM
Expert1900 points

If it is possible, please show me a sample example.

Many Thanks.

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  • David Zhang16358
    Posted by David Zhang16358
    on Mar 29 2011 15:48 PM
    Expert1900 points

    Looks like no one knows how to set up their own TI op amp into current sink mode.

     

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  • Bruce Trump
    Posted by Bruce Trump
    on Mar 29 2011 23:23 PM
    Verified Answer
    Verified by Ron Michallick
    Mastermind20805 points

    David,

    Sorry but I have found your questions and descriptions ambiguous.

    Here is a modified Howland current sink using the OPA548. Output current is -2A and compliance voltage is approximately 4V to 20V in simulation. Use precision resistors. The 2V input voltage sets the -2A output current in the load. Current flows from the load through the 1ohm resistor, R5, into the op amp and to ground.

    Regards, Bruce.

     

    opa548 Modified Howland current source
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  • David Zhang16358
    Posted by David Zhang16358
    on Apr 04 2011 09:28 AM
    Expert1900 points

    Sincere Thanks Bruce.

    I have used TL431 to realize my idea.

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