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LT1787HVCS8 Datasheet(PDF) 9 Page - Linear Technology

Part # LT1787HVCS8
Description  Precision, High Side Current Sense Amplifiers
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1787HVCS8 Datasheet(HTML) 9 Page - Linear Technology

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9
LT1787/LT1787HV
Figure 3. Split Supply Output Voltage
SENSE VOLTAGE (VS
+ – V
S
) (mV)
1787 F03
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–128
–64
0
32
–96
–32
64
96
128
VS = 3.3V TO 60V
TA = – 40°C TO 85°C
SENSE VOLTAGE (VS
+ – V
S
) (mV)
1787 F05
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–128
–64
0
32
–96
–32
64
96
128
VS = 3.3V TO 60V
TA = – 40°C TO 85°C
Figure 5. Single Supply Output Voltage
with VBIAS = 1.25V
Figure 2. Split Supply Operation
*OPTIONAL
C2
1
µF
–5V
1787 F02
OUTPUT
C3*
1000pF
C1
1
µF
RSENSE
15V
TO
CHARGER/
LOAD
1
2
3
4
8
7
6
5
LT1787
FIL+
FIL
VBIAS
VOUT
VS
VS
+
DNC
VEE
ROUT
Figure 4. Charge/Discharge Current Monitor on
Single Supply with VBIAS = 1.25V
C2
1
µF
20k
5%
1787 F04
3.3V
LT1634-1.25
*OPTIONAL
OUTPUT
C1
1
µF
RSENSE
3.3V
TO
60V
TO
CHARGER/
LOAD
1
2
3
4
8
7
6
5
LT1787HV
FIL+
FIL
VBIAS
VOUT
VS
VS
+
DNC
VEE
C3*
1000pF
ROUT
amplified sense voltage appearing between the A/D con-
verters –IN and +IN terminals. The front page of the data
sheet shows a similar circuit which uses a voltage refer-
ence for improved accuracy and signal range. The LTC1286
converter uses sequential sampling of its –IN and +IN
inputs. Accuracy is degraded if the inputs move between
sampling intervals. A filter capacitor from FIL+ to FILas
well as a filter capacitor from VBIAS to VOUT may be
necessary if the sensed current changes more than 1LSB
within a conversion cycle.
Figure 6. Unidirectional Output into A/D
with Fixed Supply at VS
+
R2
5k
5%
1787 F06
IOUT
C1
1
µF
5V
VREF
VCC
GND
LTC1286
CS
CLK
DOUT
+IN
–IN
TO
µP
RSENSE
5V
1
2
3
4
8
7
6
5
LT1787
FIL+
FIL
VBIAS
VOUT
VS
VS
+
DNC
VEE
R1
20k
5%
ROUT
APPLICATIONS INFORMATION


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