33.3kW

33.3kW

Æ

1

Æ

2

Æ

2

Æ

1

Æ

2

Æ

2

Zer

-

Drift

Æ

OUT

REF2

REF1

GND

V+

V+

Output

PRODUCT

GAIN

50V/V

100V/V

INA286

200V/V

INA283

500V/V

INA284

1000V/V

INA285

INA282

Supply

14V to +80V

-

Load

+IN

-

IN

Æ

1

Æ

1

INA282, INA283

INA284, INA285

INA286

www.ti.com

SBOS485A – NOVEMBER 2009 – REVISED JULY 2010

UNIDIRECTIONAL OPERATION

Unidirectional operation allows the INA282 family to measure currents through a resistive shunt in one direction.

In the case of unidirectional operation, the output could be set at the negative rail (near ground, and the most

common connection) or at the positive rail (near V+) when the differential input is 0V. The output moves to the

opposite rail when a correct polarity differential input voltage is applied.

The required polarity of the differential input depends on the output voltage setting. If the output is set at the

positive rail, the input polarity must be negative to move the output down. If the output is set at ground, the

polarity is positive to move the output up.

The following sections describe how to configure the output for unidirectional operation.

Ground Referenced Output

When using the INA282 family in this mode, both reference inputs are connected to ground; this configuration

takes the output to the negative rail when there is 0V differential at the input (as Figure 34 shows).

Figure 34. Ground Referenced Output

Copyright © 2009–2010, Texas Instruments Incorporated

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Product Folder Link(s): INA282 INA283 INA284 INA285 INA286