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参数资料
| 型号： | LTC6101HVACS5#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | PLASTIC, MO-193, TSOT-23, 5 PIN |
| 文件页数： | 3/20页 |
| 文件大小： | 250K |
| 代理商： | LTC6101HVACS5#TR |
LTC6101/LTC6101HV
11
6101fg
APPLICATIONS INFORMATION
Selection of External Output Resistor, ROUT
The output resistor, ROUT, determines how the output cur-
rent is converted to voltage. VOUT is simply IOUT ROUT.
In choosing an output resistor, the max output voltage
must rst be considered. If the circuit that is driven by the
output does not limit the output voltage, then ROUT must be
chosen such that the max output voltage does not exceed
the LTC6101 max output voltage rating. If the following
circuit is a buffer or ADC with limited input range, then
ROUT must be chosen so that IOUT(MAX) ROUT is less than
the allowed maximum input range of this circuit.
In addition, the output impedance is determined by ROUT.
If the circuit to be driven has high enough input imped-
ance, then almost any useful output impedance will be
acceptable. However, if the driven circuit has relatively low
input impedance, or draws spikes of current, such as an
ADC might do, then a lower ROUT value may be required
in order to preserve the accuracy of the output. As an
example, if the input impedance of the driven circuit is
100 times ROUT, then the accuracy of VOUT will be reduced
by 1% since:
V
OUT =IOUT
R
OUT RIN(DRIVEN)
R
OUT + RIN(DRIVEN)
=IOUT ROUT
100
101
= 0.99 IOUT ROUT
Error Sources
The current sense system uses an amplier and resistors
to apply gain and level shift the result. The output is then
dependent on the characteristics of the amplier, such as
gain and input offset, as well as resistor matching.
Ideally, the circuit output is:
V
OUT = VSENSE
R
OUT
R
IN
;V
SENSE = RSENSE ISENSE
In this case, the only error is due to resistor mismatch,
which provides an error in gain only. However, offset
voltage, bias current and nite gain in the amplier cause
additional errors:
Output Error, EOUT, Due to the Amplier DC Offset
Voltage, VOS
EOUT(VOS) = VOS (ROUT/RIN)
The DC offset voltage of the amplier adds directly to the
value of the sense voltage, VSENSE. This is the dominant
error of the system and it limits the available dynamic
range. The paragraph “Selection of External Current Sense
Resistor” provides details.
Output Error, EOUT, Due to the Bias Currents,
IB(+) and IB(–)
The bias current IB(+) ows into the positive input of the
internal op amp. IB(–) ows into the negative input.
EOUT(IBIAS) = ROUT((IB(+) (RSENSE/RIN) – IB(–))
Since IB(+) ≈ IB(–) = IBIAS, if RSENSE << RIN then,
EOUT(IBIAS) ≈ –ROUT IBIAS
For instance if IBIAS is 100nA and ROUT is 1kΩ, the output
error is 0.1mV.
Note that in applications where RSENSE ≈ RIN, IB(+) causes
a voltage offset in RSENSE that cancels the error due to
IB(–) and EOUT(IBIAS) ≈ 0. In applications where RSENSE <
RIN, the bias current error can be similarly reduced if an
external resistor RIN(+) = (RIN – RSENSE) is connected as
shown in Figure 4 below. Under both conditions:
EOUT(IBIAS) = ± ROUT IOS; IOS = IB(+) – IB(–)
LTC6101
ROUT
VOUT
6101 F04
RIN
–
V+
LOAD
RSENSE
RIN
+
–
+
RIN
+ = RIN– – RSENSE
V+
V–
OUT
–IN
+IN
Figure 4. Second Input R Minimizes
Error Due to Input Bias Current
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6101HVACS5TRMPBF | 制造商:Linear Technology 功能描述:Current Sense Amplifier 100V TSOT23-5 |
| LTC6101HVAHMS8 | 制造商:Linear Technology 功能描述:SP Amp Current Sense Amp Single 100V 8-Pin MSOP |
| LTC6101HVAHMS8#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 |
| LTC6101HVAHMS8#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:- 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:电流检测 电路数:1 输出类型:- 转换速率:- 增益带宽积:125kHz -3db带宽:- 电流 - 输入偏压:- 电压 - 输入偏移:100µV 电流 - 电源:1.1µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-WFBGA，CSPBGA 供应商设备封装:4-UCSP（2x2） 包装:剪切带 (CT) 其它名称:MAX9634WERS+TCT |
| LTC6101HVAHMS8PBF | 制造商:Linear Technology 功能描述:Current Sense Amplifier 100V MSOP8 |
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