INA139NASLASH250 datasheet(5/11 Pages) TI

5 / 11 page

INA139, INA169

SBOS181C

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.

STEP RESPONSE

µs/div

1.5V

G = 100

0.5V

G = 100

STEP RESPONSE

µs/div

G = 50

G = 10

OPERATION

Figure 1 shows the basic circuit diagram for both the INA139

and the INA169. Load current, IS, is drawn from the supply,

VS, through the shunt resistor, RS. The voltage drop in the

shunt resistor, VS, is forced across RG1 by the internal op

amp, causing current to flow into the collector of Q1. The

external resistor, RL, converts the output current to a voltage,

VOUT, at the OUT pin.

The transfer function for the INA139 is:

IO = gm (VIN+) – (VIN–)

(1)

where gm = 1000µA/V

(2)

In the circuit of Figure 1, the input voltage, (VIN+) – (VIN–), is

equal to IS • RS and the output voltage, VOUT, is equal to

IO • RL. The transconductance, gm, of the INA139 is

1000

µA/V. The complete transfer function for the current

measurement amplifier in this application is:

VOUT = (IS) (RS) (1000µA/V) (RL)

(3)

FIGURE 1. Basic Circuit Connections.

VOLTAGE GAIN

EXACT RL (Ω)

NEAREST 1% RL (Ω)

11k

22k

4.99k

10k

20k

50k

49k

100

100k

Shunt

INA139

OUT

–

Load

Ω

IN+

IN–

V+

NOTE: (1) Maximum V

P and V+ voltage is 60V with the INA169.

V+ power can be

common or

indepedent of

load supply.

2.7V

≤ (V+) ≤ 40V(1)

Load Power Supply

+2.7V to 40V(1)

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