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INA202AQDGKRQ1 Datasheet(PDF) 11 Page - Texas Instruments

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Part # INA202AQDGKRQ1
Description  High-Side Measurement Current-Shunt Monitor with Open-Drain Comparator and Reference
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA202AQDGKRQ1 Datasheet(HTML) 11 Page - Texas Instruments

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G=
V
V
-
OUT1
OUT2
100mV
20mV
-
V
RTI(Referred-To-Input)=
OS
V
OUT1
G
- 100mV
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
2
4
6
8
10
12
14
16
18
V
(mV)
SENSE
20
Actual
Ideal
INA200-Q1
INA201-Q1
INA202-Q1
www.ti.com
SBOS558
– APRIL 2011
Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS
larger-than-normal offset can appear at the current
shunt monitor output with a typical maximum value of
This
region
of
operation
provides
the
highest
VOUT = 300mV for VSENSE = 0mV. As VSENSE
accuracy.
Here,
the
input
offset
voltage
is
approaches 20mV, VOUT returns to the expected
characterized
and
measured
using
a
two-step
output value with accuracy as specified in the
method. First, the gain is determined by Equation 1.
Electrical Characteristics. Figure 28 illustrates this
effect using the INA202-Q1 (Gain = 100).
(1)
where:
VOUT1 = Output Voltage with VSENSE = 100mV
VOUT2 = Output Voltage with VSENSE = 20mV
Then the offset voltage is measured at VSENSE =
100mV and referred to the input (RTI) of the current
shunt monitor, as shown in Equation 2.
(2)
In the Typical Characteristics, the Output Error vs
Common-Mode Voltage curve (Figure 8) shows the
highest accuracy for the this region of operation. In
this plot, VS = 12V; for VCM ≥ 12V, the output error is
Figure 28. Example for Low VSENSE Cases 1 and 3
at its minimum. This case is also used to create the
(INA202-Q1, Gain = 100)
VSENSE ≥ 20mV output specifications in the Electrical
Characteristics table.
Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS
Normal Case 2: VSENSE ≥ 20mV, VCM < VS
This region of operation is the least accurate for the
This region of operation has slightly less accuracy
INA200-Q1
family.
To
achieve
the
wide
input
than Normal Case 1 as a result of the common-mode
common-mode voltage range, these devices use two
operating area in which the part functions, as seen in
op amp front ends in parallel. One op amp front end
the Output Error vs Common-Mode Voltage curve
operates in the positive input common-mode voltage
(Figure 8). As noted, for this graph VS = 12V; for VCM
range, and the other in the negative input region. For
< 12V, the Output Error increases as VCM becomes
this case, neither of these two internal amplifiers
less than 12V, with a typical maximum error of
dominates and overall loop gain is very low. Within
0.005% at the most negative VCM = –16V.
this region, VOUT approaches voltages close to linear
operation levels for Normal Case 2. This deviation
Low VSENSE Case 1:
from linear operation becomes greatest the closer
VSENSE < 20mV, –16V ≤ VCM < 0; and
VSENSE approaches 0V. Within this region, as VSENSE
Low VSENSE Case 3:
approaches 20mV, device operation is closer to that
VSENSE < 20mV, VS < VCM ≤ 80V
described by Normal Case 2. Figure 29 illustrates this
Although the INA200-Q1 family of devices are not
behavior for the INA202-Q1. The VOUT maximum
designed for accurate operation in either of these
peak for this case is tested by maintaining a constant
regions, some applications are exposed to these
VS, setting VSENSE = 0mV and sweeping VCM from 0V
conditions. For example, when monitoring power
to VS. The exact VCM at which VOUT peaks during this
supplies that are switched on and off while VS is still
test varies from part to part, but the VOUT maximum
applied to the INA200-Q1, INA201-Q1, or INA202-Q1,
peak is tested to be less than the specified VOUT
it is important to know what the behavior of the
tested limit.
devices will be in these regions.
As VSENSE approaches 0mV, in these VCM regions,
the
device
output
accuracy
degrades.
A
Copyright
© 2011, Texas Instruments Incorporated
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Product Folder Link(s): INA200-Q1 INA201-Q1 INA202-Q1


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