XTR111: How to enhance VI source current circuit.

Marceli Firlej

Prodigy 50 points

Part Number: XTR111

In XTR111 circuit I need enhance control from 0 - 100mA. How to connect external parts?

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Marceli,

the output current of XTR111 must be limited to less than 50mA or you risk that the XTR111 becomes damaged. The XTR111 is not designed to output a current of 100mA.

I would think about using the improved Howland current pump:

3835.snoa474a.pdf

Kai

0 Raymond Zhang1 over 5 years ago in reply to kai klaas69

TI__Guru* 77541 points

Hi Marceli,

In addition to Kai's suggestion, please also take a look at the following application.

https://www.ti.com/lit/an/slaa867/slaa867.pdf?ts=1594133161307&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fdocs%252Funiversalsearch.tsp%253FsearchTerm%253Dhigh%2Bside%2Bcurrent%2Bsource%2Bcircuit

Best,

Raymond

0 Marceli Firlej over 5 years ago in reply to Raymond Zhang1

Prodigy 50 points

Thank you, it very good solution. I could add using for Q1 and Q2 IRF7343 MOSFET.

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XTR111: How to enhance VI source current circuit.