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参数资料
| 型号： | INA271 |
| 英文描述： | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| 中文描述： | 电压输出，单向测量电流并联监视器 |
| 文件页数： | 10/13页 |
| 文件大小： | 299K |
| 代理商： | INA271 |
"#$
"#%
SBOS381 FEBRUARY 2007
www.ti.com
10
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
SENSE
(mV)
24
INA271 V
OUT
Limit
(1)
V
CM2
V
CM1
V
CM3
V
CM4
V
, V
, and V
illustrate the variance
from part to part of the V
CM
that can cause
maximum V
OUT
with V
SENSE
< 20mV.
V
OUT
limit at V
SENSE
= 0mV,
0
≤
V
CM1
≤
V
S
NOTE: (1) INA271 V
OUT
Limit = 0.4V. INA270 V
OUT
Limit = 0.28V.
Ideal
Figure 4. Example for Low V
Case 2
(INA271, Gain = 20)
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. This
gate 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 all powered and under-powered conditions. An
example shutdown circuit is shown in Figure 5.
RFI/EMI
Attention
recommended. Keep traces short and, when 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 INA193INA198 may provide different EMI
performance.
to
good
layout
practices
is
always
R
S
0.1
μ
F
V+ > 3V
Load
16V to +80V
Supply
Negative
and
Positive
CommonMode
Voltage
I
L
A1
A2
SinglePole Filter
Capacitor
5k
5k
96k
R
L
PRE OUT
BUF IN
GND
OUT
IN
IN+
V+
INA270, INA271
74HC04
Figure 5. INA270INA271 Example Shutdown Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| INA271AID | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| INA271AIDR | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| IS-5 | One Channel/ ISD-5 Two Channel/ ISQ-5 Four Channel Optically Coupled Isolat |
| IS25C64-3G | EEPROM |
| IS42S16100-10T | x16 SDRAM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| INA271AID | 功能描述:电流和电力监控器、调节器 Vltg Output H-Side Measurement RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| INA271AIDG4 | 功能描述:电流和电力监控器、调节器 Vltg Output Hi-Side Msrmt Crnt-Shunt Mon RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| INA271AIDR | 功能描述:电流和电力监控器、调节器 Vltg Output H-Side Measurement RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| INA271AIDRG4 | 功能描述:电流和电力监控器、调节器 Vltg Output Hi-Side Msrmt Crnt-Shunt Mon RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| INA271AQDRQ1 | 功能描述:电流和电力监控器、调节器 Auto Cat Unidir- Msrmt Crnt-Shunt Mon RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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