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參數(shù)資料
| 型號： | LTC6102HDD-1#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CURRENT SENSE 8-DFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 增益帶寬積： | 200kHz |
| 電流 - 輸入偏壓： | 60pA |
| 電壓 - 輸入偏移： | 3µV |
| 電流 - 電源： | 420µA |
| 電流 - 輸出 / 通道： | 1mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 60 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-DFN-EP（3x3） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1322 (CN2011-ZH PDF) |
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LTC6102
LTC6102-1/LTC6102HV
12
6102fd
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
25mV
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
APPLICATIONS INFORMATION
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.
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.
For this example, choosing a 5mΩ RSENSE will maximize
the dynamic range and provide a system that has 100mV
across the sense resistor at peak load (20A), while input
offset causes an error equivalent to only 0.6mA of load
current.
Peak dissipation is 2W. If a 0.5mΩ sense resistor is em-
ployed, then the effective current error is 6mA (0.03%
of full-scale), while the peak sense voltage is reduced to
10mV at 20A, dissipating only 200mW.
The low offset and corresponding large dynamic range of
the LTC6102 make it more exible than other solutions
in this respect. The 3μV typical offset gives 100dB of dy-
namic range for a sense voltage that is limited to 300mV
max, and over 116dB of dynamic range if a maximum of
2V is allowed.
The previous example assumes that a large output dynamic
range is required. For circuits that do not require large
dynamic range, the wide input range of the LTC6102 may
be used to reduce the size of the sense resistor, reducing
power loss and increasing reliability. For example, in a
100A circuit requiring 60dB of dynamic range, the input
offset and drift of most current-sense solutions will require
that the shunt be chosen so that the sense voltage is at
least 100mV at full scale so that the minimum input is
greater than 100μV. This will cause power dissipation in
excess of 10W at full scale! That much power loss can put
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