LTC6102HV Linear Technology, LTC6102HV Datasheet - Page 14

• Manufacturer Part Number: LTC6102HV
• Description: Zero Drift High Side Current Sense Amplifier
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
LTC6102/LTC6102HV
the LTC6102HV to translate V
mode voltage of up to 100V. For the case where a large
input resistor is used, a similar resistor in series with +IN
will reduce error due to input bias current.
Reverse Supply Current
Some applications may be tested with reverse-polarity
supplies due to an expectation of this type of fault during
operation. The LTC6102 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
14
Figure 8. Schottky Prevents Damage During Supply Reversal
V
O
D
V
L
A
CM
IN
V
+
Figure 7. Voltage Level-Shift Circuit
+IN
V
V
R
D1
OUT
–
IN
=
LTC6102
V
+IN
V
IN
–
•
+
R
LTC6102
R
R
OUT
IN
SENSE
–
+
IN
–
–INS
OUT
–INF
V
V
to V
+
REG
–
0.1μF
(Figure 8). This will
OUT
R1
100
V
OUT
–INS
–INF
V
R2
4.99k
REG
+
with a common
6102 F08
R
OUT
0.1μF
V
OUT
6102 F07
V
BATT
limit the reverse current through the LTC6102. Note that
this diode will limit the low voltage performance of the
LTC6102 by effectively reducing the supply voltage to the
part by V
In addition, if the output of the LTC6102 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 LTC6102’s output should be connected
through a resistor or Schottky diode (Figure 9).
Response Time
The LTC6102 is designed to exhibit fast response to inputs
for the purpose of circuit protection or signal transmission.
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 a delay before the output voltage
begins changing. This can be reduced by increasing the
minimum output current, either by increasing R
decreasing R
is illustrated in the step response curves in the Typical
Performance Characteristics section of this datasheet.
Note that the curves are labeled with respect to the initial
output currents.
The speed is also affected by the external circuit. In this
case, if the input changes very quickly, the internal ampli-
fi er will slew the gate of the internal output FET (Figure 1)
L
O
A
D
+IN
V
D1
D
–
.
Figure 9. Additional Resistor R3 Protects
Output During Supply Reversal
LTC6102
IN
. The effect of increased output current
+
R
SENSE
–
–INS
–INF
V
V
OUT
REG
+
0.1μF
R2
4.99k
R1
100
R3
1k
6102 F09
V
BATT
ADC
SENSE
6102f
or