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INA139 Datasheet(PDF) 5 Page - Texas Instruments

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Part # INA139
Description  High-Side Measurement CURRENT SHUNT MONITOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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INA139, INA169
5
SBOS181C
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted.
STEP RESPONSE
20
µs/div
1.5V
G = 100
0.5V
1V
G = 100
0V
STEP RESPONSE
10
µs/div
1V
G = 50
0V
2V
G = 10
0V
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 ()
NEAREST 1% RL ()
11k
1k
22k
2k
5
5k
4.99k
10
10k
10k
20
20k
20k
50
50k
49k
100
100k
100k
Shunt
R
S
INA139
2
1
OUT
Q1
R
L
I
O
+
V
O
Load
R
G1
1k
R
G2
1k
V
IN+
V
IN–
3
4
I
S
V+
5
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)
V
P
Load Power Supply
+2.7V to 40V(1)


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