- 您現(xiàn)在的位置：買賣IC網 > PDF目錄44987 > LT6109IMS-1#PBF (LINEAR TECHNOLOGY CORP) SPECIALTY ANALOG CIRCUIT, PDSO10 PDF資料下載
參數資料
| 型號： | LT6109IMS-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數： | 3/28頁 |
| 文件大?。?/td> | 370K |
| 代理商： | LT6109IMS-1#PBF |
第1頁第2頁當前第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
LT6109-1/LT6109-2
11
610912f
APPLICATIONS INFORMATION
The output current can be transformed back into a voltage
by adding a resistor from OUTA to V–(typically ground).
The output voltage is then:
VOUT = V– + IOUTA ROUT
where ROUT = R1 + R2 + R3 as shown in Figure 3.
Table 1. Example Gain Configurations
GAIN
RIN
ROUT VSENSE FOR VOUT = 5V IOUTA AT VOUT = 5V
20
499Ω
10k
250mV
500A
50
200Ω
10k
100mV
500A
100
100Ω
10k
50mV
500A
Useful Equations
Input Voltage: VSENSE = ISENSE RSENSE
Voltage Gain:
VOUT
VSENSE
=
ROUT
RIN
Current Gain:
IOUTA
ISENSE
=
RSENSE
RIN
Note that VSENSE(MAX) can be exceeded without damaging
the amplifier, however, output accuracy will degrade as
VSENSE goes beyond VSENSE(MAX).
Selection of External Current Sense Resistor
The external sense resistor, RSENSE,hasasignificanteffect
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 measured load current will cause power
dissipation as well as a voltage drop in RSENSE. As a
result, the sense resistor should be as small as possible
while still providing the input dynamic range required by
the measurement. Note that the 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 sense ampli-
fier of the LT6109. To ensure the specified performance,
RSENSE should be small enough that VSENSE does not
exceed VSENSE(MAX) under peak load conditions. As an
example, an application may require the maximum sense
voltage be 100mV. If this application is expected to draw
2A at peak load, RSENSE should be set to 50mΩ.
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 amplifier is limited by
theinputoffset.Asanexample,theLT6109hasamaximum
input offset of 350V. If the minimum current is 20mA, a
sense resistor of 17.5mΩ will set VSENSE to 350V. This
is the same value as the input offset. A larger sense resis-
tor will reduce the error due to offset by increasing the
sense voltage for a given load current. Choosing a 50mΩ
RSENSE will maximize the dynamic range and provide a
system that has 100mV across the sense resistor at peak
load (2A), while input offset causes an error equivalent to
only 7mA of load current.
In the previous example, the peak dissipation in RSENSE
is 200mW. If a 5mΩ sense resistor is employed, then
the effective current error is 70mA, while the peak sense
voltage is reduced to 10mV at 2A, dissipating only 20mW.
The low offset and corresponding large dynamic range of
theLT6109makeitmoreflexiblethanothersolutionsinthis
respect.The350Vmaximumoffsetgives63dBofdynamic
range for a sense voltage that is limited to 500mV max.
Sense Resistor Connection
Kelvin connection of the SENSEHI and SENSELO inputs
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 sig-
nificant error in measurement due to their relatively large
resistances.One10mm
×10mmsquaretraceof1ozcopper
is approximately 0.5mΩ. A 1mV error can be caused by as
little as 2A flowing through this small interconnect. This
will cause a 1% error for a full-scale VSENSE of 100mV.
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.
Figure3illustratestherecommendedmethodforconnect-
ing the SENSEHI and SENSELO pins to the sense resistor.
相關PDF資料 |
PDF描述 |
|---|---|
| LT6109HMS-1#TRPBF | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| LT6555IGN#PBF | TRIPLE 1-CHANNEL, VIDEO MULTIPLEXER, PDSO24 |
| LT6604CUFF-2.5#PBF | SPECIALTY ANALOG CIRCUIT, PQCC34 |
| LT6604CUFF-2.5#TRPBF | SPECIALTY ANALOG CIRCUIT, PQCC34 |
| LT6604CUFF-5#TRPBF | SPECIALTY ANALOG CIRCUIT, PQCC34 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LT6109IMS-2#PBF | 功能描述:IC AMP CURRENT SENSE 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LT6109IMS-2#TRPBF | 功能描述:IC AMP CURRENT SENSE 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LT611 | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:RED OVAL LAMP LED |
| LT6110 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Cable/Wire Drop Compensator |
| LT6110HDC#TRMPBF | 制造商:Linear Technology 功能描述:IC WIRE DROP COMPENSATOR 制造商:Linear Technology 功能描述:CABLE / WIRE DROP COMPENSATOR 8DFN 制造商:Linear Technology 功能描述:CABLE / WIRE DROP COMPENSATOR, 8DFN 制造商:Linear Technology 功能描述:CABLE/WIRE DROP COMPENSATOR, DFN-8, IC Function:Cable / Wire Drop Compensator, B |
發(fā)布緊急采購，3分鐘左右您將得到回復。