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參數(shù)資料
| 型號： | LTCMN |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual High Voltage, High Side Current Sense Amplifier |
| 中文描述： | 雙高電壓，高側(cè)電流檢測放大器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 267K |
| 代理商： | LTCMN |
LTC6103
8
6103f
APPLICATIONS INFORMATION
Sense Resistor Connection
Kelvin connections should be used between the inputs (+IN
and –IN) and the sense resistor in all but the lowest power
applications. Solder connections and PC board intercon-
nections that carry high current can cause significant 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 flowing 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.
Selection of External Input Resistor, R
IN
The external input resistor, R
IN
, controls the trans-
conductance of the current sense circuit. Since:
I
V
R
OUT
SENSE
IN
=
, transconductance g
=
1
R
m
IN
For example, if R
IN
= 100
Ω
, then:
V
OUT
=
100
or I
OUT
= 1mA for V
SENSE
= 100mV.
R
IN
should be chosen to allow the required resolution
while limiting the output current. At low supply voltage,
I
OUT
may be as much as 1mA. By setting R
IN
such that
the largest expected sense voltage gives I
OUT
= 1mA, then
the maximum output dynamic range is available. Output
dynamic range is limited by both the maximum allowed
output current and the maximum allowed output voltage,
as well as the minimum practical output signal. If less
dynamic range is required, then R
IN
can be increased
accordingly, reducing the maximum output current and
power dissipation. If low sense currents must be resolved
accurately in a system that has very wide dynamic range,
a smaller R
IN
than the maximum current specification
allows may be used if the maximum current is limited in
another way, such as with a Schottky diode across R
SENSE
(Figure 3a). This will reduce the high current measurement
accuracy by limiting the result, while increasing the low
current measurement resolution.
This approach can be helpful in cases where occasional
large burst currents may be ignored. It can also be used
in a multi-range configuration where a low current circuit
is added to a high current circuit (Figure 3b). Note that a
comparator (LTC1540) is used to select the range, and
transistor M1 limits the voltage across R
SENSE(LO)
.
I
SENSE
Figure 2. Kelvin Input Connection Preserves
Accuracy Despite Large Load Current
Figure 3a. Shunt Diode Limits Maximum Input Voltage to Allow
Better Low Input Resolution Without Overranging
+
–
+IN
OUT
V
S
1/2
LTC6103
–IN
R
IN
R
SENSE
V
+
V
–
R
OUT
6103 F02
LOAD
I
LOAD
V
+
LOAD
D
SENSE
6103 F03a
R
SENSE
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