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参数资料
| 型号： | MAX9937AXK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| -3db带宽： | 350kHz |
| 电流 - 输入偏压： | 2µA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 20µA |
| 电流 - 输出 / 通道： | 22mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1392 (CN2011-ZH PDF) |
| 其它名称： | MAX9937AXK+TDKR |
In this case, RRS = RRSP = RRSN, ΔRRS depends on the
tolerance of the RRS resistors used, and ΔIB = input off-
set current of the amplifier.
The temperature drift of these parameters similarly add
up to give a final result.
Shown below is an example calculation of VOS at
+25°C:
With VOS = ±1.2mV (max), IB = 5.6A (max), ΔIB =
±12% (max) of 5.6A (max) = ±0.67A (max), and RRS
= 500
Ω with ±1% tolerance (i.e., ΔRRS = ±5Ω max)
VOS-FINAL = 1.25mV (max).
Flexible EMI Filtering
Real-world applications of current-sense amplifiers
need to measure currents precisely in the presence of
a wide variety of input transients. For example, fast
load-current transients when measuring at the input of a
switching buck regulator can cause high-frequency dif-
ferential sense voltages to occur at inputs of the
MAX9937, although the signal of interest is the average
DC value. Alternately, parasitic voltage pickup on a dis-
connected or long cable can cause common-mode
voltage transients to occur at inputs of the MAX9937,
which are required to be rejected effectively.
The MAX9937 allows two methods of filtering to help
improve performance in the presence of input common-
mode voltage and input differential-voltage transients
(see Figure 1).
The capacitor CIN between RS+ and RSN helps filter
against input differential voltages, and prevents them
from reaching the MAX9937. The corner frequency of
this filter is determined by the choice of RRSN and CIN.
Similarly, capacitor COUT from OUT to ground helps fil-
ter the output voltage, thus providing not only differen-
tial filtering, but also filtering for input common-mode
transients that have made it past the MAX9937. The
corner frequency of this filter is similarly determined by
choice of ROUT and COUT. Note: The MAX9937 is a
current-output device, and has the ability to drive an
infinite amount of load capacitance.
f
R
COUT
C OUT
OUT
=
×
1
2
π
f
RC
CIN
RSN
IN
=
×
1
2
π
MAX9937
Automotive Current-Sense Amplifier
with Reverse-Battery Protection
_______________________________________________________________________________________
9
LOAD
MICROCONTROLLER
ADC
RSENSE
GND
OUT
VCC
RS+
RS-
RRSN
499
Ω
RRSP
499
Ω
ROUT
10k
Ω
5V
RSP
RSN
BIAS
BLOCK
VBAT = 4V
TO 28V
MAX9937
COUT*
1nF
CIN*
220nF
*FILTER CAPACITORS ARE OPTIONAL.
GAIN = VOUT
VSENSE
= ROUT
RRSP
Figure 1. Typical Application Circuit with Optional External Filtering
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9937EVKIT+ | 功能描述:放大器 IC 开发工具 MAX9937 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9938EVKIT+ | 功能描述:放大器 IC 开发工具 MAX9938 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9938FEBS+G45 | 制造商:Maxim Integrated Products 功能描述:1?A, 4-BUMP UCSP/SOT23,PRECISION CURRENT-SENSE AMPLIFIER - Rail/Tube |
| MAX9938FEBS+T | 功能描述:电流灵敏放大器 1uA Bump Precision Current Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9938FEBS+TG45 | 功能描述:电流灵敏放大器 1uA Bump Precision Current Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
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