CSA240
–6V to 80V, Bidirectional, Ultra-Precise
Current Sense Amplifier with Enhanced PWM Rejection
1. 特性
3. 说明
•
增强型 PWM 抑制
•
出色的 CMRR:
– 160dB DC CMRR (typ)
– 106dB AC CMRR at 50kHz (typ)
•
宽共模电压范围:−6V 至 80V
•
精度:
–
Gain:
•
Gain error: 0.10% (max)
•
Gain drift: 6ppm/°C (typ)
–
Offset:
•
Offset voltage: ±15μV (max)
•
Offset drift: 600nV/°C (max)
•
可供选择的增益:
–
CSA240L: 20V/V
–
CSA240M: 50V/V
–
CSA240N: 100V/V
•
静态电流:1.4mA (typ)
CSA240 器件是一款电压输出的电流检测放大器 。其 具有
增强型 PWM 抑制功能,可在−6V 至 80V 的宽共模 电压
范围内检测分流电阻器上的压降。CSA240 的−6V 共模
电压允许器件在地电压以下工作, 典型应用场景例 如检
测螺线管的反激周期时:在使用脉宽调制(PWM )信 号进
行控制的系统中,增强型 PWM 抑制可以针对大共 模瞬
变提供高水平抑制。此功能允许进行精确的电 流测 量的
同时不会在输出电压上出现大的瞬变和相关的恢复纹 波 。
该器件采用 2.7V 至 5.5V 单电源供电,典型电源电 流为
1.4mA,带宽典型值为 550kHz。CSA240 提供三种 固定
增益:20V/V、50V/V 和 100V/V。其零漂移架构可 在分
流器上实现低至 10mV 满量程电流检测(典型值)。 所有
版本均可满足在−40°C 至 125°C 的扩展温度范围内 工作 ,
并提供 SOIC-8、TSSOP-8 和 MSOP-8 封装选择。有 关订
购信息,请参见 Table 1。
2. 应用
•
电机控制
•
螺线管和阀门控制
•
执行器控制
•
通信设备
•
BMS 系统
Supply
(2.7V to 5.5V)
M
IN–
IN+
–
+
OUT
REF2
REF1
Typical Appliation
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Enhanced PWM Rejection
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
Table 1 lists the order information.
Table 1. Order Information
ORDER NUMBER(1)
PART
CH
PACKAGE
NU MBER (#)
V CC
(V)
IQ
(TYP)
(m A)
GBW
(k Hz)
GAIN
(TYP)
(V/V)
OP. TEMP
(º C)
RATING
PACKAGE
OP TION
CSA240LCSOIC8 CSA240L
CSA240MCSOIC8 CSA240M
1
1
SOIC-8
SOIC-8
−6-80V
−6-80V
1.4
1.4
550
550
20
50
−40-125
−40-125
Industrial T/R-4000
Industrial T/R-4000
CSA240NCSOIC8 CSA240N
CSA240LCTSSOP8 CSA240L
CSA240MCTSSOP8 CSA240M
1
1
1
SOIC-8
TSSOP-8
TSSOP-8
−6-80V
−6-80V
−6-80V
1.4
1.4
1.4
550
550
550
100
20
50
−40-125
−40-125
−40-125
Industrial T/R-4000
Industrial T/R-4000
Industrial T/R-4000
CSA240NCTSSOP8 CSA240N
CSA240LCMSOP8 CSA240L
1
1
TSSOP-8
MSOP-8
−6-80V
−6-80V
1.4
1.4
550
550
100
20
−40-125
−40-125
Industrial T/R-4000
Industrial T/R-4000
CSA240MCMSOP8 CSA240M
CSA240NCMSOP8 CSA240N
1
1
MSOP-8
MSOP-8
−6-80V
−6-80V
1.4
1.4
550
550
50
100
−40-125
−40-125
Industrial T/R-4000
Industrial T/R-4000
Devices can be ordered via the following two ways:
1. Place orders directly on our website (https://www.analogysemi.com), or;
2. Contact our sales team by mailing to sales@analogysemi.com.
N ot e:
Order Number
CSA240G-Package Code
Package Code
Device
Gain
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
4. PIN CONFIGURATION AND FUNCTIONS
Figure 1 illustrates the pin configuration.
NC
1
8
OUT
IN
1
8
IN+
IN+
2
7
REF1
GND
2
7
REF1
IN
3
6
REF2
REF2
3
6
VS
GND
4
5
VS
NC
4
5
OUT
TSSOP-8
SOIC-8/MSOP-8
Figure 1. Pin Configuration
Table 2 lists the pin functions.
Table 2. Pin Functions
POSITION
SOIC- 8/ NAME
TSSOP-8
MSOP- 8
TYPE
D ESCRIPTION
1
4
NC
---
2
8
IN+
Analog input
Connect to supply side of shunt resistor.
3
1
IN−
Analog input
Connect to load side of shunt resistor.
4
5
2
6
GND
VS
Analog
---
6
7
3
7
REF2
REF1
Analog input
Analog input
8
5
OUT
Analog output
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Reserved. Connect to ground or leave floating.
Ground
Power supply, 2.7V to 5.5V
Reference 2 voltage. Connect to 0V to VS.
Reference 1 voltage. Connect to 0V to VS.
Output voltage
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
5. SPECIFICATIONS
5.1 ABSOLUTE MAXIMUM RATINGS
Table 3 lists the absolute maximum ratings of the CSA240. Over operating free-air temperature range, unless
otherwise noted.
Table 3. Absolute Maximum Ratings
PARAMETER
D ESCRIPTION
MIN
MAX
Supply
Voltage
6
Analog inputs, VIN+, VIN−(2)
Differential (VIN+) − (VIN−), 1s
maximum duration due to
package thermal dissipation
Common-mode
V
80
REF1, REF2, NC inputs
−6
GND − 0.3
82
VS + 0.3
Output
GND − 0.3
VS + 0.3
Operating free-air, TA
Temperature
−80
−40
Junction, TJ
Storage, Tstg
−65
UN ITS
V
V
V
125
°C
150
°C
150
°C
N ot e 1: Stresses beyond those listed under Table 3 may cause permanent damage to the device. These are
stress ratings only, which do not imply functional operation of the device at these or any other
conditions beyond those indicated under Table 5. Exposure to absolute-maximum-rated conditions
for extended periods may affect device reliability.
N ot e 2: VIN+ and VIN− are the voltages at the IN+ and IN− pins, respectively.
5.2 ESD RATINGS
Table 4 lists the ESD ratings of the CSA240.
Table 4. ESD Ratings
PARAMETER
Electrostatic
Discharge
SYMB OL
V(ESD)
D ESCRIPTION
VALUE
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±6000
Charged-device model (CDM), per JEDEC specification JESD22-C101 (2)
±1000
UN ITS
V
N ot e 1: The JEDEC document JEP155 indicates that 500V HBM allows safe manufacturing with a standard
ESD control process.
N ot e 2: The JEDEC document JEP157 indicates that 250V CDM allows safe manufacturing with a standard
ESD control process.
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
5.3 RECOMMENDED OPERATING CONDITIONS
Table 5 lists the recommended operating conditions for the CSA240.
Table 5. Recommended Operating Conditions
PARAMETER
Common-Mode Input Voltage
Operating Supply Voltage
Operating Free-Air Temperature
SYMB OL
MIN
VCM
VS
TA
NOM
MAX
U NITS
−6
2.7
80
5.5
V
V
−40
125
°C
5.4 THERMAL INFORMATION
Table 6 lists the thermal information for the CSA240.
Table 6. Thermal Information
PARAMETER
Junction-to-Ambient Thermal Resistance
Junction-to-Case (Top) Thermal Resistance
Junction-to-Board Thermal Resistance
Junction-to-Top Characterization Parameter
Junction-to-Board Characterization Parameter
Junction-to-Case (Bottom) Thermal Resistance
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SYMBOL
MSOP-8
TSSOP-8
SOIC-8
U NITS
RθJA
RθJC(top)
145
48.3
187
120
90.6
47.6
°C/W
°C/W
RθJB
ψJT
83.3
1.7
46
82
35
50.8
°C/W
°C/W
ψJB
RθJC(bot)
81.7
85
1
118
3.6
47
°C/W
°C/W
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
5.5 ELECTRICAL CHARACTERISTICS
Table 7 lists the electrical characteristics of the CSA240. TA = 25°C, VS = 5V, VSENSE = VIN+ − VIN−, VCM = 12V, and
VREF1 = VREF2 = VS / 2, unless otherwise noted.
Table 7. Electrical Characteristics
PA RAMETER
SY MBOL
C ONDITIONS
MI N
V CM
V IN+ = −6V to 80V, V SENSE = 0mV, TA =
− 40°C to 125°C
−6
V IN+ = −6V to 80V, V SENSE = 0mV, TA =
−40°C to 125°C
135
TY P
MA X
UNI TS
80
V
I NPUT
Common-Mode Input Range
Common-Mode Rejection
Ratio
Offset Voltage, Input-Referred
Offset Voltage Drift
Power-Supply Rejection Ratio
Input Bias Current
CMRR
f = 50kHz
V OS
dV OS/dT
PSRR
IB
160
dB
106
V SENSE = 0mV
±3
± 15
µV
V SENSE = 0mV, TA = −40°C to 125°C
± 185
± 600
nV/°C
V S = 2.7V to 5.5V, V SENSE = 0mV, TA =
−40°C to 125°C
± 0.2
± 5.6
µ V/V
IB+ , IB− , V SENSE = 0mV
Reference Input Range
10
0
nA
VS
V
OUTPUT
Gain
G
CSA240L
20
CSA240M
50
CSA240N
TA = −40°C to 125°C
Non-Linearity Error
GND + 10mV ≤ V OUT ≤ V S − 200mV
V OUT = |(V REF1 − V REF2) | / 2 at V SENSE
Reference Divider Accuracy
Reference Voltage Rejection
Ratio (Input-Referred)
100
GND + 50mV ≤ V OUT ≤ V S − 200mV
Gain Error
Maximum Capacitive Load
± 0.05%
± 0.1%
±6
30
ppm/°C
± 0.01%
0.01%
= 0mV, TA = −40°C to 125°C
RVRR
V/V
0.35%
CSA240L
10
CSA240N
5
CSA240M
2
No sustained oscillation
2
nF
V S − 0.005
V
µ V/V
V OL TAGE OUTPUT(2)
Swing to V S Power-Supply Rail
R L = 10kΩ to GND, TA = −40°C to
125°C
Swing to GND
R L = 10kΩ to GND, V SENSE = 0mV,
V REF1 = V REF2 = 0V, TA = −40°C to
125°C
VS −
0.015
V GND + 1
V GND + 15
mV
FR E QUENCY RESPONSE
Bandwidth
BW
Settling Time - Output Settles to
0.5% of Final Value
Slew Rate
All gains, −3dB bandwidth
CSA240L
SR
550
kHz
5
µs
1.5
V/µ s
90
nV/√Hz
NOI SE (INPUT REFERRED)
Voltage Noise Density
POWE R SUPPLY
Operating Voltage Range
VS
TA = −40°C to 125°C
2.7
V SENSE = 0mV
Quiescent Current
IQ
5.5
1.4
IQ vs temperature, TA = −40°C to
125°C
V
1.8
2
mA
TE MPERATURE RANGE
Specified Range
−40
125
°C
N ot e 1: See the IN PUT SIGNAL BANDWIDTH section for more details.
N ot e 2: See Figure 14.
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
6. TYPICAL CHARACTERISTICS
TA = 25°C, VS = 5V, VCM = 12V, and VREF = VS / 2, unless otherwise noted.
Figure 2. Input Offset Voltage Production Distribution
Figure 3. Offset Voltage vs. Temperature
Figure 4. Common-Mode Rejection Production Distribution Figure 5. Common-Mode Rejection Ratio vs. Temperature
F igure 6. Gain Error Production Distribution
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Figure 7. Gain Error vs. Temperature
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
F igure 8. Gain vs. Frequency
Figure 9. Power-Supply Rejection Ratio vs. Frequency
Figure 10. Common-Mode Rejection Ratio vs. F requency
Figure 11. Input Bias Current vs. Common-Mode Voltage
F igure 12. Quiescent Current vs. Temperature
Figure 13. Input-Referred Voltage Noise vs. Frequency
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
F igure 14. 15. 0.1Hz to 10Hz Voltage Noise
Figure Step Response
F igure 16. Common-Mode Voltage Transient Response
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
7. 详细说明
7.1 概述
CSA240 是一款宽共模、零漂移、超高共模抑制比(CMRR)的精密电流检测放大器,其输入端具备增强 PWM 抑 制功能 。
这种增强的 PWM 抑制功能能有效降低共模瞬变对与 PWM 信号相关的输出信号的影响。CSA240 带宽可达 550kHz 并 提
供多个增益版本选择:20V/V、50V/V 和 100V/V,研发人员可根据应用中预期的目标电流范围优化所需的满量程输 出
电压。
7.2 功能模块框图
VS
IN–
IN+
–
Enhanced
PWM
Rejection
OUT
+
50k
REF2
50k
REF1
GND
Figure 17. Functional Block Diagram
7.3 特性描述
7.3.1 增强型 PWM 抑制功能
CSA240 的增强 PWM 抑制功能可以使 CSA240 的输出在输入共模快速变化后迅速恢复,建立时间约 1-1.2µs ,使其可 以
支持更高的 PWM 频率,及更低的占空比。
7.3.2 输入信号
CSA240 输入共模电压支持−6V 到 80V,并集成了增强型 PWM 抑制功能,因此可以广泛用于处理宽电压范围内的大 共
模瞬变等应用场景。面对大的共模跳变,CSA240 可以有效并且快速抑制共模跳变引起的毛刺,提供高精度的测量输出 。
在电机、螺线管和其他开关应用中,被监测的电流信号变化速度往往低于共模跳变的速度,该共模信号可能以 PWM 形 式
高速跳变,CSA240 能够有效抑制 PWM 跳变在输出端引起的毛刺,更好的提取出被检测的电流信号。
CSA240 带宽由器件内部电流检测放大器的−3dB 带宽定义:
典型值 550kHz, 请参见 ELECTRICAL CHARACTERISTICS 表。
器件带宽提供快速检测和处理过流事件所需的快速吞吐量和快速响应。在缺乏足够带宽的情况下,保护电路可 能没有 足
够的响应时间,并且可能会对受监控的应用程序或电路造成损坏。
某些应用可能需要对 CSA240 额外增加滤波器,以此进一步滤除干扰或者降低噪声。理论上可以在 CSA240 的输入或 者
输出端加滤波器,放在输出端滤波会导致 CSA240 的输出阻抗变化,而放在输入端的差分 RC 滤波器会带来两个主要 问
题:一是引入额外误差,降低测量精度;二是如果输入端串接的电阻阻值过大,可能导致运放的增益发生变化。针对第 一
种情况,虽然 CSA240 输入偏置电流很小,但为了应对串联电阻引入的差分输入端输入误差,依然建议尽量将滤波电 阻
阻值控制在 10Ω 以内,这也有助于减小运放增益误差。如果特殊应用必须选择大输入滤波电阻,CSA240 内部差分反 馈
电阻阻值大概 17kΩ,设计者可以利用这个参数进行增益误差计算和校正。
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
7.4 芯片功能模式
7.4.1 利用参考管脚调整输出中点
Figure 18 显示了分压器精度的参考测试电路。CSA240 输出可配置为允许单向或双向工作。
VS
VS
IN–
–
OUT
+
REF2
IN+
REF1
GND
Figure 18. Test Circuit for Reference Divider Accuracy
注
不要将 REF1 引脚或 REF2 引脚连接到任何低于 GND 或高于 VS 的电压源。
通过向参考电压输入端 REF1 和 REF2 施加一个或多个电压来设置输出电压。参考输入会连接到内部增益网络。两个参 考
引脚之间没有操作差异。
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
7.4.2 单向电流测量的参考引脚连接
顾名思义,单向工作就是允许测量在单一方向上通过电阻分流器的电流。对于单向工作,将器件参考引脚连接在一 起,然
后连接到负轨(参见 GROUN D REFERENCED OUTPUT 部分)或正轨(参见 VS REFERENCED OUTPUT 部分)。所需的差分输
入极性取决于输出电压设置。放大器输出偏离参考轨的距离与通过外部分流电阻器的电流成正比。如果放大器 参考引 脚
连接到正轨,
则输入极性必须为负才能将放大器输出向下移动(朝向地)。如果放大器参考引脚接地,
则输入极性必须为正 ,
以便将放大器输出向上移动(朝向电源)。以下部分描述了如何为单向操作情况配置输出。
7.4.2.1 参考接地
当 CSA240 以单向模式使用接地参考输出时,两个参考输入都接地;当输入端存在 0V 差分电压时,此配置将输出为地 电
压(如 Figure 19 所示)。
VS
VS
IN–
–
OUT
+
REF2
IN+
REF1
GND
Figure 19. Ground Referenced Output
7.4.2.2 VS 参考输出
通过将两个参考引脚连接到正电源来配置具有 V S 参考输出的单向模式。该配置适用于对需要在负载上电之前对放大器 输
出和其他控制电路进行稳定供电的应用(如 Figure 20 所示)。
VS
VS
IN–
–
OUT
+
REF2
IN+
REF1
GND
Figure 20. VS Referenced Output
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–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
7.4.3 双向电流测量的参考引脚连接
双向工作允许 CSA240 在两个方向上测量通过电阻分流器的电流。对于这种应用,输出电压可以设置在参考输入限制 范
围内的任何位置。一种常见的配置是将参考输入设置为半量程,以在两个方向上实现相等的范围。但是,当双向电流不 对
称时,可以将参考输入设置为半刻度以外的电压。
7.4.3.1 输出设置为外部参考电压
将两个引脚连接在一起然后连接到参考电压会导致输出电压等于输入引脚短路或 0V 差分输入条件下的参考电压;这 种
配置如 Figure 21 所示。当 IN+引脚相对于 IN−引脚为负时,输出电压降至参考电压以下,当 IN+引脚相对于 IN −引脚 为
正时,输出电压升高。这种技术是将输出偏置到精确电压的最准确方法。
VS
VS
IN–
–
OUT
+
REF2
IN+
2.5V
Reference
REF1
GND
Figure 21. External Reference Output
7.4.3.2 输出设置为中间电源电压
通过将一个参考引脚连接到 VS,将另一个连接到 GND 引脚,当没有差分输入时,输出设置为电源电压的一半,如 Figure
22 所示。这种方法对电源电压产生比例偏移,其中对于施加到输入的 0V,输出电压保持在 VS / 2。
VS
VS
IN–
–
OUT
Output
+
REF2
IN+
REF1
GND
Figure 22. Midsupply Voltage Output
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
7.4.3.3 输出设置为中间外部参考
在这种情况下,通过将一个 REF 引脚接地并将另一个 REF 引脚连接到基准,外部基准被除以 2,如 Figure 23 所示。
VS
VS
IN–
–
OUT
+
REF2
IN+
2.5V
Reference
REF1
GND
Figure 23. Mid-External Reference Output
7.4.3.4 使用电阻分压器设置输出
CSA240 REF1 和 REF2 引脚允许调整输出电压的中点,以便系统电路连接到模数转换器(ADC)或其他放大器。REF 引 脚
设计为直接连接到电源、接地或低阻抗参考电压。REF 引脚可以连接在一起并使用电阻分压器进行偏置以实现自定义输 出
电压。如果在该配置中使用放大器,如 Figure 24 所示,将输出用作相对于电阻分压器电压的差分信号。不建议在此配 置
中将放大器输出用作单端信号,因为内部阻抗偏移会对器件性能规格产生不利影响。
VS
VS
R1
IN–
–
OUT
To ADC+
+
To ADC–
REF2
IN+
REF1
R2
GND
Figure 24. Setting the Reference Using a Resistor Divider
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
8. 应用和实现
注
以下应用部分中的信息不是 AnalogySem i 组件规范的一部分,AnalogySemi 不保证其准确性或完 整
性。AnalogySemi 的客户有责任确定组件是否适合他们的用途。客户应验证和测试他们的设计实施 以
确认系统功能。
8.1 典型应用
CSA240 在多种应用场景中的优势体现为:
•
•
•
高共模范围和出色的 CMRR 可实现直接在线感应
超低偏移和漂移消除了校准的必要性
宽电源范围可实现与大多数微处理器的直接接口
典型应用如下文所示。
8.1.1 电机相电流检测应用
5V
VS
48V
IN+
OUT
CSA240
REF2
IN–
REF1
GND
100m
M
Figure 25. Inline Motor Application Circuit
8.1.1.1 设计需求
Inline 电流感测在电机控制中具有许多优势,从减少扭矩纹波到实时电机健康监测。然而,inline 电流测量的满量 程 PWM
电压要求为精确测量电流带来了挑战。50kHz 至 100kHz 范围内的开关频率会产生更高的 ΔV/Δt 信号转换,必须解决 这
些问题才能获得准确的在线电流测量。
CSA240 具有卓越的共模抑制能力、高精度和高共模规格,可提供宽范围共模电压的性能。
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
8.1.1.2 设计参考
对于此应用,CSA240 测量 48V、4000RPM 电机的驱动电路中的电流。
为了演示该器件的性能,本设计选择增益为 20V/V 的 CSA240L,并由 5V 电源供电。
使用 AD JUSTING THE OUTPUT MIDPOINT WITH THE REFERENCE PIN S 部分中的信息,通过将电源分开,REF1 接地,REF2
连接电源,将参考点设置为中刻度。此配置允许进行双极电流测量。或者,可以将参考引脚连接在一起并由外部精密参 考
驱动。
电流感测电阻器的大小可使 CSA240 的输出不饱和。选择 100mΩ 的值以将模拟输入保持在器件限制范围内。
Figure 26. Inline Motor Current-Sense Input and Output Signals
8.2 设计建议
8.2.1 高精度应用
对于高精度应用,通过以下方式验证放大器的准确性和稳定性:
•
•
•
提供连接到 REF1 和 REF2 的精密参考
优化感应电阻器的电源和感应路径的布局(参见 LAYOUT 部分)
在电源引脚上提供足够的旁路电容(参见 POWER SUPPLY D ECOUPLING 部分)
8.2.2 电流检测电阻的开尔文连接
为提供准确的电流测量,请验证电流检测电阻器和放大器之间的布线是否使用开尔文连接。在器件布局期间使用 Figure
27 和 LAYOUT 部分中提供的信息。
Kelvin Connection from
Shunt Resistor
1
1
8
2
RSHUNT
Non-Kelvin Connection
from Shunt Resistor
8
2
7
7
RSHUNT
CSA240
CSA240
3
6
3
6
4
5
4
5
Strongly Recommended
Do NOT Recommend
Figure 27. Shunt Connections to the CSA240
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
9. 电源供电推荐
CSA240 系列可在连接的电源电压(VS)之外进行精确测量,
因为输入(IN+和 IN−)可在−6V 至 80V 之间的任意电压下运行 ,
与 VS 无关。例如,VS 电源等于 5V,被测分流器的共模电压可高达 80V。
尽管输入的共模电压可以超出电源电压,但 CSA240 系列的输出电压范围受限于电源电压。
将电源旁路电容器放置在尽可能靠近电源和接地引脚的位置。旁路电容建议不得小于 10nF,一般建议使用 0.1µF。可 以
添加额外的去耦电容来补偿噪声或高阻抗电源。
10. 布局
电流检测电阻布线不当会导致放大器输入引脚之间产生额外的电阻。 任何额外的高电流承载阻抗都会导致严重的测量 误
差,因为电流电阻器的欧姆值非常低。使用开尔文或 4 线连接连接到器件输入引脚。这种连接技术可确保仅检测输入 引
脚之间的电流检测电阻器阻抗。
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
11. PACKAGE INFORMATION
The CSA240 is available in the SOIC-8, TSSOP-8, and MSOP-8 packages.
11.1 SOIC-8 PACKAGE
E
E1
L
Figure 28 shows the SOIC-8 package view.
PIN#1
b
e
c
A
A2
A1
D
Figure 28. SOIC-8 Package View
Table 8 provides detailed information about the dimensions of the SOIC-8 package.
Table 8. Dimensions of the SOIC-8 Package
SYMB OL
D IMENSIONS IN MILLIMETERS
D IMENSIONS IN INCHES
MIN
MAX
MIN
MAX
A
A1
1.350
0.100
1.750
0.250
0.053
0.004
0.069
0.010
A2
b
1.350
0.330
1.550
0.510
0.053
0.013
0.061
0.020
c
D
0.170
4.700
0.250
5.100
0.007
0.185
0.010
0.201
E
E1
5.800
3.800
6.200
4.000
0.228
0.150
0.244
0.157
e
1.270 (BSC)
0.050 (BSC)
L
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
11.2 TSSOP-8 PACKAGE
Figure 29 shows the TSSOP-8 package view.
e
E1
A
E
b
PIN#1
A2
A
A1
c
D
A
A2
L
Detailed A
H
A1
Figure 29. TSSOP-8 Package View
Table 9 provides detailed information about the dimensions of the TSSOP-8 package.
Table 9. Dimensions of the TSSOP-8 Package
SYMB OL
D IMENSIONS IN MILLIMETERS
MIN
MAX
D IMENSIONS IN INCHES
MIN
MAX
A
---
1.200
---
0.047
A1
A2
0.050
0.800
0.150
1.000
0.002
0.031
0.006
0.039
b
c
0.190
0.090
0.300
0.200
0.007
0.004
0.012
0.008
D
2.900
3.100
0.114
0.122
E
6.250
6.550
0.246
0.258
E1
e
L
4.300
4.500
0.169
0.177
0.700
0.020
H
θ
0.650 (BSC)
0.500
0.026 (BSC)
0.250 (TYP)
1°
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0.010 (TYP)
7°
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7°
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
11.3 MSOP-8 PACKAGE
Figure 30 shows the MSOP-8 package view.
e
c
E
E1
L
b
A2
A
A1
D
Figure 30. MSOP-8 Package View
Table 10 provides detailed information about the dimensions of the MSOP-8 package.
Table 10. Dimensions of the MSOP-8 Package
SYMB OL
D IMENSIONS IN MILLIMETERS
MIN
MAX
D IMENSIONS IN INCHES
MIN
MAX
A
A1
--0.020
1.100
0.150
--0.001
0.043
0.006
A2
b
0.750
0.250
0.950
0.380
0.030
0.010
0.037
0.015
c
D
0.090
2.900
0.230
3.100
0.004
0.114
0.009
0.122
e
E
4.750
5.050
0.187
0.199
E1
2.900
3.100
0.114
0.122
L
0.400
0.800
0.016
0.031
θ
0°
6°
0°
6°
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0.650 (BSC)
0.026 (BSC)
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
12. TAPE AND REEL INFORMATION
12.1 SOIC-8 PACKAGE
Figure 31 illustrates the carrier tape.
+0.25
Φ1.50 0
4.00 ± 0.10
0.25 ± 0.03
+0.10
Φ1.50 0
R0.30 MAX
2.10 ± 0.10
6.40 ± 0.1
8.00 ± 0.10
5.4 ± 0.10
5.50 ± 0.10
1.75 ± 0.10
12.00 ± 0.30
2.00 ± 0.05
R0.50
5º MAX
Notes:
1. Cover tape width: 9.5 ± 0.10.
2. Cumulative tolerance of 10 sprocket hole pitch: ± 0.20 (max).
3. Camber: not to exceed 1mm in 100mm.
4. Mold#: SOIC-8.
5. All dimensions: mm.
6. Direction of view:
Figure 31. Carrier Tape Drawing
Table 11 provides information about tape and reel.
Table 11. Tape and Reel Information
PACKAGE
TYPE
REEL
QTY/REEL
SOIC-8
13’’
4000
REEL/
IN N ER B OX/
QTY/CARTON
IN N ER B OX
CARTON
1
8
32000
IN N ER B OX
SIZE (m m)
CARTON
SIZE (m m)
358*340*50
430*380*390
Figure 32 shows the product loading orientation—pin 1 is assigned at Q1.
Pin 1
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
* Q: Pocket quadrant
Figure 32. Product Loading Orientation
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
12.2 TSSOP-8 PACKAGE
Figure 33 illustrates the carrier tape.
+0.10
4.00 ± 0.10
Φ1.50 –0
2.00 ± 0.05
1.75 ± 0.10
0.30 ± 0.05
3.30 ± 0.10
+0.30
A
12.00 –0.10
A
5.50 ± 0.05
B
MAX 7º
1.20
8.00 ± 0.10
B
+0.25
Φ1.50 –0
B-B
+0.07
6.76 –0.10
1.80 ± 0.10
8º MAX
3.91
0.30 ± 0.05
A-A
Notes:
1. Cover tape width: 9.5 ± 0.10.
2. Cumulative tolerance of 10 sprocket hole pitch: ± 0.20 (max).
3. Camber: not to exceed 1mm in 100mm.
4. Mold#: TSSOP-8.
5. All dimensions: mm.
6. Direction of view:
Figure 33. Carrier Tape Drawing
Table 12 provides information about tape and reel.
Table 12. Tape and Reel Information
PACKAGE
TYPE
REEL
QTY/REEL
TSSOP-8
13’’
4000
REEL/
IN N ER B OX/
QTY/CARTON
IN N ER B OX
CARTON
1
8
32000
IN N ER B OX
SIZE (m m)
CARTON
SIZE (m m)
358*340*50
430*380*390
Figure 34 shows the product loading orientation—pin 1 is assigned at Q1.
Pin 1
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
* Q: Pocket quadrant
Figure 34. Product Loading Orientation
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–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
12.3 MSOP-8 PACKAGE
2.00 ± 0.05
8.00 ± 0.10
1.75 ± 0.10
Figure 35 illustrates the carrier tape.
4.00 ± 0.10
3.40 ± 0.10
+0.30
12.00 –0.10
5.50 ± 0.05
0.25 ± 0.02
1.40 ± 0.10
5.30 ± 0.10
Notes:
1. Cover tape width: 9.5 ± 0.10.
2. Cumulative tolerance of 10 sprocket hole pitch: ± 0.20 (max).
3. Camber: not to exceed 1mm in 250mm.
4. Mold#: MSOP-10.
5. All dimensions: mm.
6. Direction of view:
Figure 35. Carrier Tape Drawing
Table 13 provides information about tape and reel.
Table 13. Tape and Reel Information
PACKAGE
TYPE
REEL
QTY/REEL
MSOP-8
13’’
4000
REEL/
IN N ER B OX/
QTY/CARTON
IN N ER B OX
CARTON
1
8
32000
IN N ER B OX
SIZE (m m)
CARTON
SIZE (m m)
358*340*50
430*380*390
Figure 36 shows the product loading orientation—pin 1 is assigned at Q1.
Pin 1
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
* Q: Pocket quadrant
Figure 36. Product Loading Orientation
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CSA240
–6V to 80V, Bidirectional, Ultra-Precise Current Sense Amplifier with Enhanced PWM Rejection
REVISION HISTORY
REVISION
DATE
Rev A
07 February 2023
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D ESCRIPTION
Rev A release.
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