INA117AM datasheet(7/17 Pages) TI1

7 / 17 page

INA117

SBOS154A

MEASURING CURRENT

The INA117 can be used to measure a current by sensing the

voltage drop across a series resistor, RS. Figure 4 shows the

INA117 used to measure the supply currents of a device

under test. The circuit in Figure 5 measures the output

current of a power supply. If the power supply has a sense

connection, it can be connected to the output side of RS to

eliminate the voltage-drop error. Another common applica-

tion is current-to-voltage conversion, as shown in Figure 6.

FIGURE 4. Measuring Supply Currents of Device Under

Test.

380k

Ω

380k

Ω

380k

Ω

21.1k

Ω

20k

Ω

V–

V+

O = V3 – V2

200

Ω

If offset adjust is also required,

connect to offset circuit, Figure 2.

CMR

Adjust

FIGURE 3. CMR Trim Circuit.

FIGURE 5. Measuring Power Supply Output Current.

380k

Ω

20k

Ω

380k

Ω

380k

Ω

380k

Ω

380k

Ω

380k

Ω

21.1k

Ω

DUT+

DUT–

21.1k

Ω

20k

Ω

V–

V+

V–

V+

Device

Under

Test

–V

*Not needed if R is less than 20

—see text.

Ω

(+200V max)

(–200V max)

O = RS IDUT+

O = RS IDUT–

380k

Ω

380k

Ω

380k

Ω

20k

Ω

21.1k

Ω

V–

V+

±200V max

Load

Power Supply

Out

Sense

C = RS not needed if RS is less than 20Ω—see text.

Optional Load

Sense Connection

(see text)

O = IL RS

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