參數(shù)資料
型號(hào)： LTCMN
廠商： Linear Technology Corporation
元件分類(lèi)： 運(yùn)動(dòng)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(cè)放大器
文件頁(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 267K
代理商： LTCMN
LTC6103
12
6103f
will give a lowpass response. This will reduce unwanted
noise from the output, and may also be useful as a charge
reservoir to keep the output steady while driving a switch-
ing circuit such as a mux or ADC. This output capacitor
in parallel with an output resistor will create a pole in the
output response at:
1
2
π
f
R
C
dB
3
OUT
OUT
–
=
Useful Equations
Input Voltage: V
SENSE
=
I
R
Voltage
SENSE
SENSE
Gain:
V
Current Gain:
I
OUT
OUT
V
R
R
SENSE
OUT
IN
=
I
R
R
V
SENSE
SENSE
IN
SEN
=
Transconductance:
I
OUT
SE
IN
SENSE
I
SENSE
R
R
R
=
=
1
Transimpedance:
V
OUT
OUT
R
IN
Reverse Supply Protection
Some applications may be tested with reverse-polarity
supplies due to an expectation of this type of fault during
operation. The LTC6103 is not protected internally from
external reversal of supply polarity. To prevent damage
that may occur during this condition, a Schottky diode
should be added in series with V
–
(Figure 5). This will
limit the reverse current through the LTC6103. Note that
this diode will limit the low voltage performance of the
LTC6103 by effectively reducing the supply voltage to the
part by V
D
.
In addition, if the output of the LTC6103 is wired to a
device that will effectively short it to high voltage (such as
through an ESD protection clamp) during a reverse sup-
ply condition, the LTC6103’s output should be connected
through a resistor or Schottky diode (Figure 6).
Response Time
The LTC6103 is designed to exhibit fast response to inputs
for the purpose of circuit protection or signal transmis-
sion. This response time will be affected by the external
circuit in two ways, delay and speed. If the output current
is very low and an input transient occurs, there may be an
increased delay before the output voltage begins changing.
This can be improved by increasing the minimum output
current, either by increasing R
SENSE
or decreasing R
IN
. The
effect of increased output current is illustrated in the step
response curves in the Typical Performance Characteristics
of this data sheet. Note that the curves are labeled with
respect to the initial output currents.
APPLICATIONS INFORMATION
Figure 5. Schottky Prevents Damage During Supply Reversal
Figure 6. Additional Resistor, R3, Protects
Output During Supply Reversal
+
–
+IN
OUT
V
S
1/2
LTC6103
–IN
R
IN
R
SENSE
V
+
V
–
D1
R
OUT
6103 F05
LOAD
I
LOAD
+
–
8
7
4
1
+IN
OUT
V
S
1/2
LTC6103
TO P
6103 F06
–IN
R
IN
R
SENSE
V
+
V
–
R
OUT
LOAD
I
LOAD
ADC
R3
D1
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