参数资料
| 型号： | LTC6103HMS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 8-MSOP |
| 标准包装： | 2,500 |
| 放大器类型： | 电流检测 |
| 电路数： | 2 |
| 增益带宽积： | 140kHz |
| 电流 - 输入偏压： | 100nA |
| 电压 - 输入偏移： | 85µV |
| 电流 - 电源： | 390µA |
| 电流 - 输出 / 通道： | 1mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 60 V，±2 V ~ 30 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
LTC6103
7
6103f
APPLICATIONS INFORMATION
In this dual current sense device, ampliers A and B are
independent except for sharing the same V– pin. So supply
voltage and component values can be chosen independently
for each amplier.
Selection of External Current Sense Resistor
The external sense resistor, RSENSE, has a signicant effect
on the function of a current sensing system and must be
chosen with care.
First, the power dissipation in the resistor should be
considered. The system load current will cause both heat
and voltage loss in RSENSE. As a result, the sense resis-
tor should be as small as possible while still providing
the input dynamic range required by the measurement.
Note that input dynamic range is the difference between
the maximum input signal and the minimum accurately
reproduced signal, and is limited primarily by input DC
offset of the internal amplier of the LTC6103.
As an example, an application may require that the
maximum sense voltage be 100mV. If this application is
expected to draw 2A at peak load, RSENSE should be no
larger than 50m
Ω.
R
V
I
mV
A
m
SENSE
PEAK
==
=
100
2
50
Once the maximum RSENSE value is determined, the mini-
mum sense resistor value will be set by the resolution or
dynamic range required. The minimum signal that can be
accurately represented by this sense amp is limited by the
input offset. As an example, the LTC6103 has a typical
input offset of 85V. If the minimum current is 20mA, a
sense resistor of 4.25m
Ω will set VSENSE to 85V. This is
the same value as the input offset. A larger sense resistor
will reduce the error due to offset by increasing the sense
voltage for a given load current.
Choosing a 50m
ΩRSENSEwillmaximizethedynamicrange
and provide a system that has 100mV across the sense
resistor at peak load (2A), while input offset causes an
error equivalent to only 1.7mA of load current.
Peak dissipation is 200mW. If instead a 5m
Ω sense resis-
tor is employed, then the effective current error is 17mA,
while the peak sense voltage is reduced to 10mV at 2A,
dissipating only 20mW.
The low offset and corresponding large dynamic range of
the LTC6103 make it more exible than other solutions
in this respect. The 85V typical offset gives 60dB of
dynamic range for a sense voltage that is limited to 85mV
max, and over 75dB of dynamic range for a maximum
input of 500mV.
THEORY OF OPERATION
An internal sense amplier loop forces –IN to have the
same potential as +IN. Connecting an external resistor, RIN,
between –IN and V+ forces a potential across RIN that is the
same as the sense voltage across RSENSE. A corresponding
current, (ILOAD + IS) RSENSE/RIN, will ow through RIN.
The high impedance inputs of the sense amplier will not
conduct this input current, so the current will ow through
an internal MOSFET to the OUT pin. In most application
cases, IS << ILOAD, so IOUT ≈ ILOAD RSENSE/RIN.
The output current can be transformed into a voltage by
adding a resistor from OUT to V–. The output voltage is
then VOUT = (V
–) + (IOUT ROUT).
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| LTC6103IMS8#PBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
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| LTC6103IMS8#TRPBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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