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參數(shù)資料
| 型號： | LTC6101AHMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | High Voltage, High-Side Current Sense Amplifier in SOT-23 |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 330K |
| 代理商： | LTC6101AHMS8 |
LTC6101/LTC6101HV
11
6101fa
Selection of External Output Resistor, R
OUT
The output resistor, R
OUT
, determines how the output
current is converted to voltage. V
OUT
is simply I
OUT
R
OUT
.
In choosing an output resistor, the max output voltage
must first be considered. If the circuit that is driven by the
output does not limit the output voltage, then R
OUT
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 R
OUT
must be chosen so that I
OUT(MAX)
R
OUT
is less
than the allowed maximum input range of this circuit.
In addition, the output impedance is determined by R
OUT
.
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 R
OUT
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 R
OUT
, then the accuracy of V
OUT
will be reduced by
1% since:
V
I
R
R
R
R
100
101
I
R
I
R
OUT
OUT
OUT
IN DRIVEN
(
OUT
IN DRIVEN
(
OUT
OUT
OUT
OUT
=
+
=
=
.
)
)
0 99
Error Sources
The current sense system uses an amplifier and resistors
to apply gain and level shift the result. The output is then
dependent on the characteristics of the amplifier, such as
gain and input offset, as well as resistor matching.
Ideally, the circuit output is:
V
V
R
R
V
R
I
OUT
SENSE
OUT
IN
SENSE
SENSE
SENSE
=
=
;
In this case, the only error is due to resistor mismatch,
which provides an error in gain only. However, offset
voltage, bias current and finite gain in the amplifier cause
additional errors:
Output Error, E
OUT
, Due to the Amplifier DC Offset
Voltage, V
OS
E
OUT(VOS)
= V
OS
(R
OUT
/R
IN
)
The DC offset voltage of the amplifier adds directly to the
value of the sense voltage, V
SENSE
. 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, E
OUT
, Due to the Bias Currents,
I
B
(+) and I
B
(–)
The bias current I
B
(+) flows into the positive input of the
internal op amp. I
B
(–) flows into the negative input.
E
OUT(IBIAS)
= R
OUT
((I
B
(+) (R
SENSE
/R
IN
) – I
B
(–))
Since I
B
(+)
≈
I
B
(–) = I
BIAS
, if R
SENSE
<< R
IN
then,
E
OUT(IBIAS)
≈
–R
OUT
I
BIAS
For instance if I
BIAS
is 100nA and R
OUT
is 1k
, the output
error is 0.1mV.
Note that in applications where R
SENSE
≈
R
IN
, I
B
(+) causes
a voltage offset in R
SENSE
that cancels the error due to
I
B
(–) and E
OUT(IBIAS)
≈
0. In applications where R
SENSE
<
R
IN
, the bias current error can be similarly reduced if an
external resistor R
IN
(+) = (R
IN
– R
SENSE
) is connected as
shown in Figure 4 below. Under both conditions:
E
OUT(IBIAS)
=
±
R
OUT
I
OS
; I
OS
= I
B
(+) – I
B
(–)
APPLICATIOU
W
U
U
LTC6101
R
OUT
V
OUT
6101 F04
R
IN
–
V
+
LOAD
R
SENSE
3
5
4
2
1
R
IN
+
–
+
R
IN
+
=
R
IN
–
–
R
SENSE
Figure 4. Second Input R Minimizes
Error Due to Input Bias Current
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC6101HVAHMS8 | Circular Connector; No. of Contacts:26; Series:MS27472; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:16-26 RoHS Compliant: No |
| LTC6101HVACMS8 | High Voltage, High-Side Current Sense Amplifier in SOT-23 |
| LTC6101HVAIMS8 | High Voltage, High-Side Current Sense Amplifier in SOT-23 |
| LTC6101HVBCS5 | High Voltage, High-Side Current Sense Amplifier in SOT-23 |
| LTC6101HVBHS5 | High Voltage, High-Side Current Sense Amplifier in SOT-23 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6101AHMS8#PBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC6101AHMS8#TR | 制造商:Linear Technology 功能描述:SP Amp Current Sense Amp Single 60V 8-Pin MSOP T/R |
| LTC6101AHMS8#TRPBF | 功能描述:IC AMP CURRENT SENSE 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| LTC6101AHS5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage, High-Side Current Sense |
| LTC6101AHS5#PBF | 制造商:Linear Technology 功能描述:SC-Amps/Current Sense, Cut Tape Current Sense Amplifier |
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