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AD8205YRZ

更新时间： 2024-02-06 00:53:18
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
12页 457K
描述
Single-Supply 42 V System Difference Amplifier

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AD8205YRZ 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：SOIC
包装说明：SOP, SOP8,.25针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.31.00.01风险等级：0.68
放大器类型：OPERATIONAL AMPLIFIER标称共模抑制比：80 dB
最大输入失调电压：4500 µVJESD-30 代码：R-PDSO-G8
JESD-609代码：e3长度：4.9 mm
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260电源：5 V
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Operational Amplifier最大压摆率：2 mA
供电电压上限：12.5 V标称供电电压 (Vsup)：5 V
表面贴装：YES温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：3.9 mm
Base Number Matches：1

AD8205YRZ 数据手册

 浏览型号AD8205YRZ的Datasheet PDF文件第6页浏览型号AD8205YRZ的Datasheet PDF文件第7页浏览型号AD8205YRZ的Datasheet PDF文件第8页浏览型号AD8205YRZ的Datasheet PDF文件第9页浏览型号AD8205YRZ的Datasheet PDF文件第10页浏览型号AD8205YRZ的Datasheet PDF文件第12页 
Data Sheet  
AD8205  
APPLICATIONS INFORMATION  
A typical application for the AD8205 is high-side measurement  
of a current through a solenoid for PWM control of the  
solenoid opening. Typical applications include hydraulic  
transmission control and diesel injection control.  
When using a high-side switch, the battery voltage is connected  
to the load when the switch is closed, causing the common-  
mode voltage to increase to the battery voltage. In this case,  
when the switch is opened, the voltage reversal across the  
inductive load causes the common-mode voltage to be held one  
diode drop below ground by the clamp diode.  
5V  
Two typical circuit configurations are used for this type of  
application.  
HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE  
SWITCH  
SWITCH  
In this case, the PWM control switch is ground referenced. An  
inductive load (solenoid) is tied to a power supply. A resistive  
shunt is placed between the switch and the load (see Figure 19).  
An advantage of placing the shunt on the high side is that the  
entire current, including the re-circulation current, can be  
measured since the shunt remains in the loop when the switch  
is off. In addition, diagnostics can be enhanced because shorts  
to ground can be detected with the shunt on the high side.  
42V  
BATTERY  
+IN  
V
1
+V  
OUT  
NC  
REF  
S
SHUNT  
AD8205  
–IN GND V  
2
REF  
CLAMP  
DIODE  
INDUCTIVE  
LOAD  
NC = NO CONNECT  
Figure 20. High-Side Switch  
In this circuit configuration, when the switch is closed, the  
common-mode voltage moves down to near the negative rail.  
When the switch is opened, the voltage reversal across the  
inductive load causes the common-mode voltage to be held one  
diode drop above the battery by the clamp diode.  
Another typical application for the AD8205 is as part of the  
control loop in H-bridge motor control. In this case, the  
AD8205 is placed in the middle of the H-bridge (see Figure 21)  
so that it can accurately measure current in both directions by  
using the shunt available at the motor. This is a better solution  
than a ground referenced op amp because ground is not  
typically a stable reference voltage in this type of application.  
This instability in the ground reference causes the  
5V  
INDUCTIVE  
LOAD  
CLAMP  
DIODE  
42V  
BATTERY  
measurements that could be made with a simple ground  
referenced op amp to be inaccurate.  
+IN  
V
1
+V  
OUT  
NC  
REF  
S
SHUNT  
AD8205  
–IN GND V  
2
The AD8205 measures current in both directions as the  
H-bridge switches and the motor changes direction. The output  
of the AD8205 is configured in an external reference  
REF  
SWITCH  
bidirectional mode, see the Output Offset Adjustment section.  
NC = NO CONNECT  
CONTROLLER  
5V  
Figure 19. Low-Side Switch  
HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE  
SWITCH  
MOTOR  
+IN  
V
1
+V  
OUT  
NC  
REF  
S
AD8205  
SHUNT  
This configuration minimizes the possibility of unexpected  
solenoid activation and excessive corrosion (see Figure 20). In  
this case, both the switch and the shunt are on the high side.  
When the switch is off, this removes the battery from the load,  
which prevents damage from potential shorts to ground, while  
still allowing the recirculating current to be measured and  
providing for diagnostics. Removing the power supply from the  
load for the majority of the time minimizes the corrosive effects  
that could be caused by the differential voltage between the load  
and ground.  
–IN GND V  
2
REF  
5V  
2.5V  
NC = NO CONNECT  
Figure 21. Motor Control Application  
Rev.D | Page 11 of 12  
 
 
 
 
 
 
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