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| 型號： | AD8218BRMZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 354K |
| 描述： | IC CURRENT MONITOR BI-DIR 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 功能： | 電流監(jiān)控器 |
| 檢測方法： | 高端 |
| 精確度： | ±0.35% |
| 輸入電壓： | 4 V ~ 80 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
AD8218
Data Sheet
Rev. B | Page 12 of 16
APPLICATIONS INFORMATION
UNIDIRECTIONAL HIGH-SIDE CURRENT SENSING
In the unidirectional high-side current sensing configuration,
the shunt resistor is referenced to the battery (see Figure 32).
High voltage is present at the inputs of the current sense amplifier.
When the shunt is battery referenced, the AD8218 produces a
linear ground-referenced analog output. The supply pin, V
S
, of the
AD8218 can either be connected to a 5 V supply or left floating (see
the Supply (V
S
) Connections section).
OAD
V
2
I
LOAD
V
1
SHUNT
BATTERY
(4V TO 80V)
LDO
R2
R1
AD8218
R4
R3
+IN
IN
OUT
ENB
REF
GND
V
S
Figure 32. Unidirectional Operation with ENB Connected to GND
The output transfer function curve for unidirectional operation
with ENB connected to GND is shown in Figure 33.
0
40
80
120
160
200
240
280
320
0
1
2
3
4
5
6
7
8
9
10
INPUT VOLTAGE mV
Figure 33. Output Transfer Function with ENB Connected to GND
BIDIRECTIONAL HIGH-SIDE CURRENT SENSING
Inputting a voltage at Pin 7 (REF) offsets the output of the AD8218
and allows for bidirectional current sensing. The transfer function
from the REF pin to the output is 1 V/V . For example, a 2.5 V REF
input offsets the output of the AD8218 to 2.5 V. See Figure 34
for typical connections. The user must ensure that the voltage
applied at Pin 7 (REF) is from a low impedance source.
SHUNT
LDO
R2
R1
AD8218
R4
R3
+IN
IN
OUT
ENB
REF
2.5V
GND
V
S
OAD
V
2
I
LOAD
V
1
BATTERY
(4V TO 80V)
Figure 34. Bidirectional Operation Using a 2.5 V Reference Input
The output transfer function curve for bidirectional operation
using a 2.5 V reference input is shown in Figure 35.
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0.15
0.10
0.05
0
0.05
0.10
0.15
INPUT VOLTAGE V
Figure 35. Transfer Function When Using a 2.5 V Reference Input
MOTOR CONTROL CURRENT SENSING
The AD8218 is a practical, accurate solution for high-side
current sensing in motor control applications. In cases where
the shunt resistor is referenced to a battery and the current
flowing is bidirectional (as shown in Figure 36), the AD8218
monitors the current with no additional supply pin necessary.
GND
BATTERY
MOTOR
I
MOTOR
AD8218
+IN
V
S
V
REF
IN
REF
OUT
ENB
Figure 36. High-Side Current Sensing in Motor Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8218BRMZ-RL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero Drift, Bidirectional Current Shunt Monitor |
| AD8219 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero Drift, Unidirectional Current Shunt Monitor |
| AD8219BRMZ | 功能描述:IC CURRENT MONITOR UNI-DIR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開關(guān) 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| AD8219BRMZ_PROMO | 制造商:Analog Devices 功能描述:IC CURRENT MONITOR UNI-DIR |
| AD8219BRMZ-RL | 功能描述:IC CURRENT MONITOR UNI-DIR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開關(guān) 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
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