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参数资料
| 型号： | LTC6104CMS8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 15/16页 |
| 文件大小： | 304K |
| 代理商： | LTC6104CMS8 |
LTC6104
8
6104f
APPLICATIONS INFORMATION
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 LTC6104. In addition,
RSENSE must be small enough that VSENSE does not exceed
the maximum input voltage specied by the LTC6104, even
under peak load conditions.
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 more 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 LTC6104 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 dis-
sipation in the sense resistor is 200mW in this example.
If instead a 5m
Ω sense resistor is employed, then the ef-
fective 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 LTC6104 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 if the rated input
maximum of ±500mV is allowed.
Sense Resistor Connection
Kelvin connection of the –INA/–INB and +INA/+INB in-
puts to the sense resistor should be used in all but the
lowest power applications. Solder connections and PC
board interconnections that carry high current can cause
signicant error in measurement due to their relatively
large resistances. One 10mm
× 10mm square trace of
one-ounce copper is approximately 0.5m
Ω. A 1mV error
can be caused by as little as 2A owing through this small
interconnect. This will cause a 1% error in a 100mV signal.
A 10A load current in the same interconnect will cause
a 5% error for the same 100mV signal. By isolating the
sense traces from the high current paths, this error can
be reduced by orders of magnitude. A sense resistor with
integrated Kelvin sense terminals will give the best results.
Figure 2 illustrates the recommended method.
+
–
8
7
6
4
+INA
OUT
+
–
VS
A
LTC6104
–INA
–INB
RIN
TO
CHARGER/LOAD
RSENSE
VSENSE +
–
+INB
V–
ILOAD
+
CURRENT
MIRROR
+
–
5
B
ROUT
VREF
6104 F02
VOUT
+
–
1
Figure 2. Kelvin Input Connections Preserve Accuracy
Despite Large Load Currents
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6104CMS8#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:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
| LTC6104CMS8#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:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| LTC6104CMS8PBF | 制造商:Linear Technology 功能描述:Bi-Directional Curr Sense Amp LTC6104 |
| LTC6104HMS8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, High Side, Bi-Directional Current Sense Amplifi er |
| LTC6104HMS8#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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