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參數(shù)資料
| 型號： | LTC6102IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 257K |
| 代理商： | LTC6102IMS |
LTC6102/LTC6102HV
8
6102fa
The LTC6102 high side current sense amplier (Figure 1)
provides accurate monitoring of current through a user-
selected sense resistor. The sense voltage is amplied by
a user-selected gain and level shifted from the positive
power supply to a ground-referred output. The output
signal is analog and may be used as is or processed with
an output lter.
Theory of Operation
An internal sense amplier loop forces –INS to have the
same potential as +IN. Connecting an external resistor,
RIN, between –INS and V+ forces a potential across RIN
that is the same as the sense voltage across RSENSE. A
corresponding current, VSENSE/RIN, will ow through RIN.
The high impedance inputs of the sense amplier will not
conduct this input current, so it will ow through the –INF
pin and an internal MOSFET to the output pin.
The output current can be transformed into a voltage by
adding a resistor from OUT to V–. The output voltage is
then VO = V– + IOUT ROUT.
Useful Gain Congurations
GAIN
RIN
ROUT
VSENSE AT VOUT = 5V
200
49.9Ω
10k
500
20Ω
10k
10mV
1000
10Ω
10k
5mV
4990
1Ω
4.99k
1mV
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
dissipation and voltage loss in RSENSE.Asaresult,thesense
resistor 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 LTC6102. In addition,
RSENSE must be small enough that VSENSE does not exceed
the maximum sense voltage specied by the LTC6102 or
the sense resistor, 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 20A at peak load, RSENSE should be no more
than 5mΩ.
Once the maximum RSENSE value is determined, the
minimum sense resistor value will be set by the resolu-
tion 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 LTC6102
has a typical input offset of 3μV. If the minimum current
is 1mA, a sense resistor of 3mΩ will set VSENSE to 3μV.
APPLICATIONS INFORMATION
BLOCK DIAGRAM
Figure 1. LTC6102/LTC6102HV Block Diagram and Typical Connection
–
+
V+
VREG
0.1μF
V–
10V
OUT
6102 BD
LTC6102/LTC6102HV
VBATTERY
IOUT
VSENSE
RSENSE
ILOAD
ROUT
RIN
–
+
L
O
A
D
VOUT = VSENSE x
ROUT
RIN
5k
10V
5V
10V
5V
–INS
–INF
+IN
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