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参数资料
| 型号： | AD8212 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | High Voltage Current Shunt Monitor |
| 中文描述： | 高压电流分流监控 |
| 文件页数： | 9/16页 |
| 文件大小： | 310K |
| 代理商： | AD8212 |
AD8212
THEORY OF OPERATION
NORMAL OPERATION
(7 V TO 65 V SUPPLY (V+) RANGE)
In typical applications, the AD8212 measures a small
differential input voltage generated by a load current
flowing through a shunt resistor.
The operational amplifier (A1) is connected across the shunt
resistor (R
SHUNT
) with its inverting input connected to the
battery/supply side, and the noninverting input connected
to the load side of the system. Amplifier A1 is powered via
an internal series regulator (depicted as a Zener diode in
Figure 22). This regulator maintains a constant 5 V between
the battery/supply terminal of the AD8212 and COM (Pin 2),
which represents the lowest common point of the internal
circuitry.
A load current flowing through the external shunt resistor
produces a voltage at the input terminals of the AD8212.
Amplifier A1 responds by causing Transistor Q1 to conduct the
necessary current through Resistor R1 to equalize the potential
at both the inverting and noninverting inputs of Amplifier A1.
The current through the emitter of Transistor Q1 (I
OUT
) is
proportional to the input voltage (V
SENSE
), and, therefore, the
load current (I
LOAD
) through the shunt resistor (R
SHUNT
). The
output current (I
OUT
) is converted to a voltage by using an
external resistor, the value of which is dependent on the input
to output gain equation desired in the application.
The transfer function for the AD8212 is
I
OUT
= (
g
m
×
V
SENSE
)
V
SENSE
=
I
LOAD
×
R
SHUNT
V
OUT
=
I
OUT
×
R
OUT
V
OUT
= (V
SENSE
× R
OUT
)/
1000
where:
g
m
= 1000
μ
A/V.
In normal voltage operation mode, the bias circuit is connected
to GND, as shown in Figure 22. In this mode, I
BIAS
is typically
185 μA throughout the 7 V to 65 V (V+) range.
Rev. 0 | Page 9 of 16
I
OUT
I
LOAD
R
OUT
AD8212
BATTERY
R
SHUNT
0
1
8
5
2
3
6
OUTPUT
CURRENT
COMPENSATION
L
R1
R2
A1
Q1
VOUT
BIAS
CIRCUIT
Figure 22. Typical Connection (7 V to 65 V Supply (Pin V+) Range)
When using the AD8212 as described, the battery/supply
voltage in the system must be between 7 V to 65 V. The 7 V
minimum supply range is necessary to turn on the internal
regulator (shown as a Zener diode in Figure 22). This regulated
voltage then remains a constant 5 V, regardless of the supply
(V+) voltage. The 65 V maximum limit in this mode of
operation is due to the breakdown voltage limitation of the
AD8212 process.
Typically, a 1% resistor can be used to convert the output
current to a voltage. Table 4 provides suggested R
OUT
values.
Table 4. Suggested R
OUT
Values
Gain (V/V)
1
10
20
50
100
R
OUT
(kΩ)
1
10
20
49.9
100
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8212_07 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Voltage Current Shunt Monitor |
| AD8212AL/QMLR | 制造商:Analog Devices 功能描述: |
| AD8212AL-EMX | 制造商:Analog Devices 功能描述:ENGINEERING VERSION OF AD8212AL/QMLR - Rail/Tube |
| AD8212WYRMZ | 功能描述:IC CURRENT MONITOR 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳流/电流管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 功能:电流开关 检测方法:- 精确度:±10% 输入电压:1.7 V ~ 5.5 V 电流 - 输出:600mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-UFQFN 供应商设备封装:10-UTQFN（1.4x1.8） 包装:管件 |
| AD8212WYRMZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Voltage Current Shunt Monitor |
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