HCPL-7840-300 查看數據表（PDF） - HP => Agilent Technologies
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HCPL-7840-300 Datasheet PDF : 12 Pages
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VOLTAGE
REGULATOR
CLOCK
GENERATOR
ISO-AMP
INPUT
Σ∆
MODULATOR
ENCODER
Figure 22. HCPL-7840 Block Diagram.
ISOLATION
BOUNDARY
LED DRIVE
CIRCUIT
DETECTOR
CIRCUIT
VOLTAGE
REGULATOR
DECODER
AND D/A
FILTER
ISO-AMP
OUTPUT
HV+
MOTOR
•••
+–
RSENSE
POSITIVE
FLOATING
SUPPLY
GATE DRIVE
CIRCUIT
•••
U1
78L05
IN OUT
C1
0.1
µF
R5
68
C2
1
0.1
µF
2
C3
0.01
µF
3
4
•••
U2
HCPL-7840
C5
150 pF
+5 V
8
C4
0.1 µF
7
R1
2.00 K
6
R2
2.00 K
5
C6
150 pF
R3
10.0 K
+15 V
C8
0.1 µF
–
U3
+ MC34081
C7
R4
10.0 K
0.1 µF
-15 V
HV–
Figure 23. Recommended Application Circuit.
R5
C2 C4
VOUT
C5
150 pF
1
2
U2
3
+5 V
+5 V
8
C4
R4A
20.0 K
0.1 µF
7
R1
10.0 K
6
R2
10.0 K
R3
10.0 K
+5 V
C8
0.1 µF
–
U3
+ MC34071
4
5
HCPL-7840
C6
150 pF
R4B
20.0 K
VOUT
C3
Figure 25. Top Layer of Printed
Circuit Board Layout.
TO VDD1
TO RSENSE+
TO RSENSE–
TO VDD2
VOUT+
VOUT–
Figure 26. Bottom Layer of Printed
Circuit Board Layout.
Figure 24. Single-Supply Post-Amplifier Circuit.
1-259
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