how to drive TI op amp to sink current ?

David Zhang16358

Expert 1860 points

Other Parts Discussed in Thread: OPA548, TL431

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

Many Thanks.

over 13 years ago

0 David Zhang16358 over 13 years ago

Expert 1860 points

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

0 Bruce Trump over 13 years ago in reply to David Zhang16358

Guru 21975 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.

0 David Zhang16358 over 13 years ago in reply to Bruce Trump

Expert 1860 points

Sincere Thanks Bruce.

I have used TL431 to realize my idea.

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how to drive TI op amp to sink current ?