Power Dissipation in RSENSE APPLICATIONS" />
參數(shù)資料
型號(hào)： LTC6102HVIDD#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 5/26頁(yè)
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(cè)
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(±)： 5 V ~ 100 V
工作溫度： -40°C ~ 85°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
LTC6102
LTC6102-1/LTC6102HV
13
6102fd
Dynamic Range vs Maximum
Power Dissipation in RSENSE
APPLICATIONS INFORMATION
a signicant load on the power supply and create thermal
design headaches. In addition, heating in the sense resistor
can reduce its accuracy and reliability.
In contrast, the large dynamic range of the LTC6102 allows
the use of a much smaller sense resistor. The LTC6102
allows the minimum sense voltage to be reduced to less
than 10μV. The peak sense voltage would then be 10mV,
dissipating only 1W at 100A in a 100μΩ sense resistor!
With a specialized sense resistor, the same system would
allow peak currents of more than 1000A without exceeding
the input range of the LTC6102 or damaging the shunt.
Figure 2. Kelvin Input Connection Preserves Accuracy
with Large Load Current and Large Output Current
LTC6102
ROUT
VOUT
6102 F02
RIN
–
V+
LOAD
RSENSE
RIN
+
–
+
V+
–INF
V–
OUT
VREG
0.1μF
TIE AS CLOSE TO RIN AS POSSIBLE
–INS
+IN
LOAD
V+
V–
OUTPUT
RSENSE*
ROUT
LTC6102
RIN
–
RIN
+
CREG
*VISHAY VCS1625 SERIES
WITH 4 PAD KELVIN CONNECTION
V–
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. Figure 2 illustrates the
recommended method. Note that the LTC6102 has a Kelvin
input structure such that current ows into –INF. The –INS
and –INF pins should be tied as close as possible to RIN.
This reduces the parasitic series resistance so that RIN
may be as low as 1Ω, allowing high gain settings to be
used with very little gain error.
Sense Resistor Connection
Kelvin connection of +IN and –INS 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 signicant error in measure-
ment due to their relatively large resistances. One 10mm
× 10mm square trace of one-ounce copper is approxi-
mately 0.5mΩ. A 1mV error can be caused by as little
as 2A owing through this small interconnect. This will
cause a 1% error in a 100mV signal. A 10A load current
in the same interconnect will cause a 5% error for the
same 100mV signal. An additional error is caused by the
change in copper resistance over temperature, which is in
excess of 0.4%/°C. By isolating the sense traces from the
Selection of External Input Resistor, RIN
The external input resistor, RIN, controls the transconduc-
tance of the current sense circuit, IOUT = VSENSE/RIN. For
example, if RIN = 100, then IOUT = VSENSE/100 or IOUT =
1mA for VSENSE = 100mV.
RIN should be chosen to provide the required resolution
while limiting the output current. At low supply voltage,
IOUT may be as much as 1mA. By setting RIN such that
MAXIMUM POWER DISSIPATION (W)
DYNAMIC
RANGE
(dB)
110
100
90
80
70
60
50
40
30
20
6102 AI01
0.001
0.01
0.1
1
10
100
MAX ISENSE = 1A
MAX ISENSE = 10A
MAX ISENSE = 100A
DYNAMIC RANGE RELATIVE
TO 10μV, MINIMUM VSENSE
RSENSE = 10mΩ
RSENSE = 100mΩ
100dB: MAX
VSENSE = 1V
40dB: MAX
VSENSE = 1mV
RSENSE = 10μΩ
RSENSE = 100μΩ
RSENSE = 1Ω
RSENSE = 1mΩ
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