參數(shù)資料
型號： INA271AIDRG4
英文描述： Voltage Output, Unidirectional Measurement Current-Shunt Monitor
中文描述： 電壓輸出，單向測量電流并聯(lián)監(jiān)視器
文件頁數(shù)： 10/17頁
文件大小： 360K
代理商： INA271AIDRG4
www.ti.com
Normal Case 2: V
SENSE
≥
20mV, V
CM
< V
S
This region of operation has slightly less accuracy
than Normal Case 1 as a result of the common-mode
operating area in which the part functions, as seen in
the
Output Error vs Common-Mode Voltage
curve
(
Figure 6
). As noted, for this graph V
S
= 12V; for V
CM
< 12V, the Output Error increases as V
becomes
less than 12V, with a typical maximum error of
0.005% at the most negative V
CM
= –16V.
ACCURACY VARIATIONS AS A RESULT OF
V
SENSE
AND COMMON-MODE VOLTAGE
The accuracy of the INA270 and INA271 current
shunt monitors is a function of two main variables:
V
SENSE
(V
IN+
– V
IN–
) and common-mode voltage,
V
CM
S
. V
CM
is
expressed as (V
IN+
+ V
IN–
)/2; however, in practice,
V
is seen as the voltage at V
because the
voltage drop across V
SENSE
is usually small.
This section
addresses
specific operating regions:
Normal Case 1: V
SENSE
≥
20mV, V
CM
≥
V
S
Normal Case 2: V
SENSE
≥
20mV, V
CM
< V
S
Low V
SENSE
Case 1:
V
SENSE
< 20mV, –16V
≤
V
CM
< 0
Low V
SENSE
Case 2:
V
SENSE
< 20mV, 0V
≤
V
CM
≤
V
S
Low V
SENSE
Case 3:
V
SENSE
< 20mV, V
S
< V
CM
≤
80V
Low
V
< 20mV, –16V
≤
V
CM
< 0; and
Low
V
Case
V
SENSE
< 20mV, V
S
< V
CM
≤
80V
Although the INA270 family of devices are not
designed for accurate operation in either of these
regions, some applications are exposed to these
conditions. For example, when monitoring power
supplies that are switched on and off while V
is still
applied to the INA270 or INA271, it is important to
know what the behavior of the devices will be in
these regions.
V
Case
1:
Normal Case 1: V
SENSE
≥
20mV, V
CM
≥
V
S
This
region
of
operation
accuracy.
Here,
the
characterized
and
method. First, the gain is determined by
Equation 1
.
G =
V
V
-
OUT1
OUT2
20mV
100mV
-
(1)
V
RTI (Referred-To-Input) =
OS
V
OUT1
G
-
100mV
(2)
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
(
O
V
(mV)
SENSE
20
Actual
Ideal
INA270
INA271
SBOS381A–FEBRUARY 2007–REVISED APRIL 2007
the
accuracy
of
these
3:
As V
SENSE
approaches 0mV, in these V
CM
regions,
the
device
output
accuracy
larger-than-normal offset can appear at the current
shunt monitor output with a typical maximum value of
V
OUT
= 60mV for V
SENSE
approaches 20mV, V
returns to the expected
output value with accuracy as specified in the
Electrical Characteristics
.
Figure 17
shows this effect
using the INA271 (Gain = 20).
degrades.
A
provides
input
measured
the
voltage
a
two-step
highest
offset
using
is
= 0mV. As V
SENSE
where:
V
OUT1
= Output Voltage with V
SENSE
= 100mV
V
OUT2
= Output Voltage with V
SENSE
= 20mV
Then the offset voltage is measured at V
SENSE
=
100mV and referred to the input (RTI) of the current
shunt monitor, as shown in
Equation 2
.
In the
Typical Characteristics
, the
Output Error vs
Common-Mode Voltage
curve (
Figure 6
) shows the
highest accuracy for the this region of operation. In
this plot, V
S
= 12V; for V
CM
≥
12V, the output error is
at its minimum. This case is also used to create the
V
SENSE
≥
20mV output specifications in the
Electrical
Characteristics
table.
Figure 17. Example for Low V
Cases 1 and 3
(INA271, Gain = 20)
10
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