參數(shù)資料
型號(hào)： INA270AIDRG4
英文描述： Voltage Output, Unidirectional Measurement Current-Shunt Monitor
中文描述： 電壓輸出，單向測(cè)量電流并聯(lián)監(jiān)視器
文件頁(yè)數(shù)： 11/17頁(yè)
文件大小： 360K
代理商： INA270AIDRG4
www.ti.com
Low V
SENSE
Case 2: V
SENSE
< 20mV, 0V
≤
V
CM
≤
V
S
This region of operation is the least accurate for the
INA270
family.
To
achieve
common-mode voltage range, these devices use two
op amp front ends in parallel. One op amp front end
operates in the positive input common-mode voltage
range, and the other in the negative input region. For
this case, neither of these two internal amplifiers
dominates and overall loop gain is very low. Within
this region, V
approaches voltages close to linear
operation levels for Normal Case 2.
SHUTDOWN
The INA270 and INA271 do not provide a shutdown
pin; however, because they consume a quiescent
current less than 1mA, they can be powered by
either the output of logic gates or by transistor
switches to supply power. Driving the gate low shuts
down the INA270–INA271. Use a totem-pole output
buffer or gate that can provide sufficient drive along
with 0.1
μ
F bypass capacitor, preferably ceramic with
good
high-frequency
characteristics.
should have a supply voltage of 3V or greater
because the INA270 and INA271 require a minimum
supply greater than 2.7V. In addition to eliminating
quiescent current, this gate also turns off the 10
μ
A
bias current present at each of the inputs. Note that
the IN+ and IN– inputs are able to withstand full
common-mode
voltage
under
under-powered conditions. An example shutdown
circuit is illustrated in
Figure 19
.
RFI/EMI
Attention
recommended.
possible, use a printed circuit board (PCB) ground
plane with surface-mount components placed as
close to the device pins as possible. Small ceramic
capacitors placed directly across amplifier inputs can
reduce RFI/EMI sensitivity. PCB layout should locate
the amplifier as far away as possible from RFI
sources. Sources can include other components in
the same system as the amplifier itself, such as
inductors (particularly switched inductors handling a
lot of current and at high frequencies). RFI can
generally be identified as a variation in offset voltage
or dc signal levels with changes in the interfering RF
signal. If the amplifier cannot be located away from
sources of radiation, shielding may be needed.
Twisting wire input leads makes them more resistant
to RF fields. The difference in input pin location of
the INA270 and INA271 versus the
INA193–INA198
may provide different EMI performance.
0.48
0.48
0.40
0.36
0.32
0.28
0.24
0.20
0.16
0.12
0.08
0.04
0
0
2
4
6
8
10
12
14
16
18
20
22
V
(
O
V
(mV)
SENSE
24
INA271 V
OUT
Limit
(1)
V
CM2
V
CM1
V
CM3
V
CM4
V
from part to part of the V
maximum V
OUT
, V
CM2
CM3
CM4
, and V
illustrate the variance
that can cause
CM
< 20mV.
SENSE
with V
V
0
limit at V
￡
V
= 0mV,
OUT
￡
SENSE
V
CM1
S
NOTE: (1) INA271 V
Limit = 0.4V. INA270 V
Limit = 0.28V.
OUT
OUT
Ideal
INA270
INA271
SBOS381A–FEBRUARY 2007–REVISED APRIL 2007
the
wide
input
This
gate
This
greatest the closer V
SENSE
approaches 0V. Within
this region, as V
SENSE
operation is closer to that described by Normal Case
2.
Figure 18
illustrates this behavior for the INA271.
The V
OUT
maximum peak for this case is determined
by maintaining a constant V
S
, setting V
SENSE
= 0mV,
and sweeping V
from 0V to V
. The exact V
at
which V
OUT
peaks during this case varies from part to
part. The maximum peak voltage for the INA270 is
0.28V; for the INA271, the maximum peak voltage is
0.4V.
deviation
from
linear
operation
becomes
all
powered
and
to
good
Keep
layout
traces
practices
short
is
always
when
and,
Figure 18. Example for Low V
SENSE
Case 2
(INA271, Gain = 20)
11
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INA270A-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:VOLTAGE-OUTPUT UNIDIRECTIONAL-MEASUREMENT CURRENT-SHUNT MONITORS
INA270AQDRQ1 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Auto Cat Unidi-Msrmt Crnt-Shunt Mon RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
INA271 制造商:BB 制造商全稱:BB 功能描述:Voltage Output, Unidirectional Measurement Current-Shunt Monitor
INA271AID 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Vltg Output H-Side Measurement RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
INA271AIDG4 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Vltg Output Hi-Side Msrmt Crnt-Shunt Mon RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
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