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參數(shù)資料
| 型號： | LTC6104IMS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CURRENT SENSE 8-MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | 100nA |
| 電壓 - 輸入偏移： | 85µV |
| 電流 - 電源： | 640µA |
| 電流 - 輸出 / 通道： | 1mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 60 V，±2 V ~ 30 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
LTC6104
8
6104f
APPLICATIONS INFORMATION
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
and voltage loss in RSENSE. As a result, the sense resis-
tor 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 LTC6104. In addition,
RSENSE must be small enough that VSENSE does not exceed
the maximum input voltage specied by the LTC6104, 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 ±2A at peak load, RSENSE should be
no more than 50m
Ω.
R
V
I
mV
A
m
SENSE
PEAK
==
=
100
2
50
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 amp is limited by the
input offset. As an example, the LTC6104 has a typical
input offset of ±85V. If the minimum current is ±20mA, a
sense resistor of 4.25m
Ω will set VSENSE to ±85V. 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.
Choosing a 50m
ΩRSENSEwillmaximizethedynamicrange
and provide a system that has ±100mV across the sense
resistor at peak load (±2A), while input offset causes an
error equivalent to only ±1.7mA of load current. Peak dis-
sipation in the sense resistor is 200mW in this example.
If instead a 5m
Ω sense resistor is employed, then the ef-
fective current error is ±17mA, while the peak sense voltage
is reduced to ±10mV at ±2A, dissipating only 20mW.
The low offset and corresponding large dynamic range of
the LTC6104 make it more exible than other solutions
in this respect. The ±85V typical offset gives 60dB of
dynamic range for a sense voltage that is limited to ±85mV
max, and over 75dB of dynamic range if the rated input
maximum of ±500mV is allowed.
Sense Resistor Connection
Kelvin connection of the –INA/–INB and +INA/+INB in-
puts 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 measurement due to their relatively
large resistances. One 10mm
× 10mm square trace of
one-ounce copper is approximately 0.5m
Ω. 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. 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.
Figure 2 illustrates the recommended method.
+
–
8
7
6
4
+INA
OUT
+
–
VS
A
LTC6104
–INA
–INB
RIN
TO
CHARGER/LOAD
RSENSE
VSENSE +
–
+INB
V–
ILOAD
+
CURRENT
MIRROR
+
–
5
B
ROUT
VREF
6104 F02
VOUT
+
–
1
Figure 2. Kelvin Input Connections Preserve Accuracy
Despite Large Load Currents
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