HCPL7840 Agilent(Hewlett-Packard), HCPL7840 Datasheet - Page 12

• Manufacturer Part Number: HCPL7840
• Description: Analog Isolation Amplifier
• Manufacturer: Agilent(Hewlett-Packard)

ISO-AMP
Figure 22. HCPL-7840 Block Diagram.
Figure 23. Recommended Application Circuit.
Figure 24. Single-Supply Post-Amplifier Circuit.
• • •
INPUT
1
2
3
4
MOTOR
HCPL-7840
U2
MODULATOR
REGULATOR
R
+
VOLTAGE
SENSE
–
8
7
6
5
HV+
HV–
+5 V
C4
0.1 µF
C1
0.1
µF
GATE DRIVE
150 pF
GENERATOR
• • •
FLOATING
POSITIVE
ENCODER
SUPPLY
CIRCUIT
10.0 K
10.0 K
IN
CLOCK
R1
R2
C6
78L05
20.0 K
U1
R4A
OUT
+5 V
R5
68
R4B
20.0 K
0.1
µF
C2
• • •
–
+
+5 V
U3
LED DRIVE
0.01
µF
C3
CIRCUIT
150 pF
10.0 K
MC34071
R3
C5
1
2
3
4
0.1 µF
C8
BOUNDARY
ISOLATION
HCPL-7840
U2
V
DETECTOR
OUT
CIRCUIT
8
7
6
5
+5 V
C4
0.1 µF
150 pF
REGULATOR
DECODER
VOLTAGE
Figure 26. Bottom Layer of Printed
Circuit Board Layout.
TO R
TO R
AND D/A
Figure 25. Top Layer of Printed
Circuit Board Layout.
2.00 K
2.00 K
C6
R1
R2
SENSE+
SENSE–
TO V
R4
10.0 K
DD1
R5
–
+
+15 V
-15 V
U3
150 pF
10.0 K
C5
MC34081
C3
R3
0.1 µF
FILTER
C7
0.1 µF
C2
C8
C4
V
ISO-AMP
OUTPUT
OUT
TO V
V
V
1-259
OUT+
OUT–
DD2