Datasheet > AD8214WYRMZ-R7

AD8214WYRMZ-R7

更新时间： 2024-01-30 12:28:02

品牌	Logo	应用领域
亚德诺 - ADI		光电二极管
页数	文件大小	规格书
17页	278K
描述
Fast Response, High Voltage, Current Shunt Comparator

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技术参数
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AD8214WYRMZ-R7 技术参数

Source Url Status Check Date：	2013-05-01 14:56:24.597	是否无铅：	含铅
是否Rohs认证：	符合	生命周期：	Active
零件包装代码：	TSSOP	包装说明：	TSSOP,
针数：	8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.69	可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT	JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	信道数量：	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：	TSSOP
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	座面最大高度：	1.1 mm
最大供电电压 (Vsup)：	65 V	最小供电电压 (Vsup)：	5 V
标称供电电压 (Vsup)：	13.5 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：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3 mm	Base Number Matches：	1

AD8214WYRMZ-R7 数据手册

AD8214

Data Sheet

APPLICATIONS

Under normal operating conditions, the current is 10 A or less,

corresponding to a maximum voltage drop across the shunt of

50 mV. This means that the negative input of the comparator is

50 mV below the battery voltage. Since the positive input is

75 mV below the battery voltage, the negative input is at a

higher potential than the positive; therefore, the output of the

AD8214 is low.

TYPICAL SETUP AND CALCULATIONS

The key feature of the AD8214 is its ability to detect an overcurrent

condition on the high side of the rail and provide a signal in less

than 100 ns. This performance protects expensive loads, FETs, and

shunt resistors in a variety of systems and applications. This section

details a typical application in which the normal current in the

system is less ≤10 A and an overcurrent detection is necessary

when 15 A is detected in the path.

If the current increases to 15 A, the drop across the shunt is

75 mV. As the current continues to increase, the positive input

of the comparator reaches a higher potential than the negative,

and the output of the AD8214 switches from low to high. The

input-to-output response of the AD8214 is less than 100 ns. The

output resistor in this case is selected so that the logic level high

signal is 3.3 V.

If we assume a shunt resistance (R_SHUNT) of 0.005 Ω and a

common-mode voltage range of 5 V to 65 V, the typical voltage

across the shunt resistor is

10 A × 0.005 Ω = 50 mV

The voltage drop across the shunt resistor, in the case of an

overcurrent condition is

The output changes states from low to high in the case of an

overcurrent condition. However, the input offset voltage is

typically 1 mV; therefore, this must be taken into consideration

when choosing the threshold voltage. When the current in the

system drops back down to normal levels, the AD8214 changes

states from high to low. However, due to the built-in 10 mV

hysteresis, the voltage at (–IN) must be 10 mV higher than the

threshold for the output to change states from high to low. This

built-in hysteresis is intended to prevent input chatter as well as

any false states.

15 A × 0.005 Ω = 75 mV

The threshold voltage, must therefore be set at 75 mV,

corresponding to the overcurrent condition. R1 and R2 can be

selected based on this 75 mV threshold at the positive input of

the comparator.

A low load current across the regulator corresponds to optimal

regulator performance; therefore, the series resistance of R1 and

R2 must be relatively large. For this case, the total resistance can

be set as

Table 4 shows typical resistors combinations that can be used to set

R1 + R2 = 200 kΩ

an input threshold voltage. Numbers are based on a 2.43 V V_REG

To have a 75 mV drop across R1, the following calculations apply:

Table 4.

2.4V

200 kΩ

Threshold (mV)

R1 (kΩ)

1.5

1.6

2.4

R2 (kΩ)

120

= 12µA

110

75 mV

12µA

= 6.25 kΩ = R1

R2 = (200 kΩ – R1) = 193.75 kΩ

8.06

169

The values for R1 and R2 are set; correspondingly, the threshold

voltage at +IN is set at 75 m V.

BATTERY

0.01µF

6.25kΩ

OUT

SHUNT

(0.005Ω)

OUT

193.75kΩ

LOAD

2.4V

REGULATOR

= 3.3kΩ

OUT

Figure 30. Typical Application

Rev. A | Page 12 of 16

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中文翻译

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AD8214WYRMZ-R7 替代型号

型号	品牌	替代类型	描述	数据表
AD8214WYRMZ	ADI	类似代替	Fast Response, High Voltage, Current Shunt Comparator

与AD8214WYRMZ-R7相关器件

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AD8215WYRZ-RL	ADI	获取价格	High Voltage, Current Shunt Monitor
AD8215YRZ	ADI	获取价格	High Voltage, Current Shunt Monitor
AD8215YRZ-R7	ADI	获取价格	High Voltage, Current Shunt Monitor
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