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HCPL788J bảng dữ liệu(PDF) 13 Page - Agilent(Hewlett-Packard)

tên linh kiện HCPL788J
Giải thích chi tiết về linh kiện  Isolation Amplifier with Short Circuit and Overload Detection
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HCPL788J bảng dữ liệu(HTML) 13 Page - Agilent(Hewlett-Packard)

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13
Analog Interfacing
Power Supplies and Bypassing
The recommended supply con-
nections are shown in Figure 26.
A floating power supply (which in
many applications could be the
same supply that is used to drive
the high-side power transistor) is
regulated to 5 V using a simple
zener diode (D1); the value of
resistor R4 should be chosen to
supply sufficient current from
Figure 25. Recommended Applications Circuit.
Figure 26. Recommended Supply and Sense Resistor Connections.
the existing floating supply. The
voltage from the current sensing
resistor (Rsense) is applied to the
input of the HCPL-788J through
an RC anti-aliasing filter (R2 and
C2). Although the application
circuit is relatively simple, a
few recommendations should
be followed to ensure optimal
performance.
The power supply for the
HCPL-788J is most often obtained
from the same supply used to
power the power transistor gate
drive circuit. If a dedicated
supply is required, in many cases
it is possible to add an additional
winding on an existing trans-
former. Otherwise, some sort of
simple isolated supply can be
used, such as a line powered
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
GND2
VDD2
FAULT
ABSVAL
VOUT
VREF
VDD2
GND2
VIN+
VIN-
CH
CL
VDD1
VLED1+
VDD1
GND1
RSHUNT
0.02
Ω
ISOLATED +5 V
R3 4.7 k
Ω
R2
39
Ω
.01 µF
C3
0.1 µF
C1
0.1 µF
HCPL-788J
INPUT
CURRENT
+5 V
A/D
VREF
GND
µC
TO OTHER
PHASE OUTPUTS
+
R1
C2
C6
0.1 µF
C4
C8
C7
C5
C5 = C7 = C8 = 470 pF
C4 = 0.1 µF
16
15
14
13
12
11
10
9
5
1
2
8
7
3
4
6
GND2
VDD2
FAULT
ABSVAL
VOUT
VREF
VDD2
GND2
VDD1
VIN+
VIN-
GND1
VDD1
CH
CL
VLED+
R2
39
Ω
+
R4
C1
0.1 µF
C2
0.01 µF
FLOATING
POWER
SUPPLY
HV+
+
–
+
R1
RSENSE
HV-
MOTOR
D1
5.1 V
GATE DRIVE
CIRCUIT
HCPL-788J



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