Datasheet

+Vs
+Vs
-Vs
-Vs
V1 5
Iload 10
Rshunt 3.5m
Vbus 10
Rout 10k
Vout
RG 499
+
+
-
Rg
Rg
Ref
U2 INA826
V2 5
INA826
SBOS562E –AUGUST 2011–REVISED APRIL 2013 www.ti.com
Figure 68 shows an example of how the INA826 can be used for low-side current sensing. The load current
(I
LOAD
) creates a voltage drop across the shunt resistor (R
SHUNT
). This voltage is amplified by the INA826, with
gain set to 100. The output swing of the INA826 is set by the common-mode voltage (which is 0 V in low-side
current sensing) and power supplies. Therefore, a dual-supply circuit is implemented. The load current was set
from 1 A to 10 A, which corresponds to an output voltage range from 350 mV to 3.5 V. The output range can be
adjusted by changing the shunt resistor and/or the gain of the INA826. Click the following link to download the
TINA-TI file: Current Sensing Circuit.
Figure 68. Low-Side Current Sensing
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Product Folder Links: INA826