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参数资料
| 型号： | INA270 |
| 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： | 7/13页 |
| 文件大小： | 299K |
| 代理商： | INA270 |
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SBOS381 FEBRUARY 2007
www.ti.com
7
APPLICATIONS INFORMATION
BASIC CONNECTION
Figure 1 illustrates the basic connection of the INA270 and
INA271. The input pins, IN+ and IN, should be connected
as closely as possible to the shunt resistor to minimize any
resistance in series with the shunt resistance.
Power-supply bypass capacitors are required for stability.
Applications with noisy or high-impedance power supplies
may require additional decoupling capacitors to reject
power-supply noise. Minimum bypass capacitors of
0.01
μ
F and 0.1
μ
F in value should be placed close to the
supply pins. Although not mandatory, an additional 10mF
electrolytic capacitor placed in parallel with the other
bypass capacitors may be useful in applications with
particularly noisy supplies.
POWER SUPPLY
The input circuitry of the INA270 and INA271 can
accurately measure beyond its power-supply voltage, V+.
For example, the V+ power supply can be 5V, whereas the
load power-supply voltage is up to +80V. The output
voltage range of the OUT terminal, however, is limited by
the voltages on the power-supply pin.
SELECTING R
S
The value chosen for the shunt resistor, R
S
, depends on
the application and is a compromise between small-signal
accuracy and maximum permissible voltage loss in the
measurement line. High values of R
S
provide better
accuracy at lower currents by minimizing the effects of
offset, while low values of R
S
minimize voltage loss in the
supply line. For most applications, best performance is
attained with an R
S
value that provides a full-scale shunt
voltage range of 50mV to 100mV. Maximum input voltage
for accurate measurements is (V
S
0.2)/Gain.
TRANSIENT PROTECTION
The 16V to +80V common-mode range of the INA270
and INA271 is ideal for withstanding automotive fault
conditions ranging from 12V battery reversal up to +80V
transients, since no additional protective components are
needed up to those levels. In the event that the INA270 and
INA271 are exposed to transients on the inputs in excess
of their ratings, external transient absorption with
semiconductor transient absorbers (zeners or Transzorbs)
will be necessary.
Use of MOVs or VDRs is not recommended except when
they are used in addition to a semiconductor transient
absorber. Select the transient absorber such that it will
never allow the INA270 and INA271 to be exposed to
transients greater than 80V (that is, allow for transient
absorber tolerance, as well as additional voltage because
of transient absorber dynamic impedance).
Despite the use of internal zener-type ESD protection, the
INA270 and INA271 are not suited to using external
resistors in series with the inputs since the internal gain
resistors can vary up to
±
30%, but are tightly matched (if
gain accuracy is not important, then resistors can be
added in series with the INA270 and INA271 inputs with
two equal resistors on each input).
A1
A2
SinglePole Filter
Capacitor
+2.7V to +18V
5k
5k
96k
R
L
PRE OUT
BUF IN
GND
OUT
IN
IN+
V+
Load
16V to +80V
Supply
R
S
INA270
0.01
μ
F
0.1
μ
F
Figure 1. INA270 Basic Connections
相关PDF资料 |
PDF描述 |
|---|---|
| INA270AID | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| INA270AIDR | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| INA271 | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| INA271AID | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| INA271AIDR | Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
相关代理商/技术参数 |
参数描述 |
|---|---|
| INA270_07 | 制造商:BB 制造商全称:BB 功能描述:Voltage Output, Unidirectional Measurement Current-Shunt Monitor |
| INA270AID | 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 |
| INA270AIDG4 | 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 |
| INA270AIDR | 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 |
| INA270AIDRG4 | 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 |
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