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PDF HCPL7520 Data sheet ( Hoja de datos )
| Número de pieza | HCPL7520 | |
| Descripción | Isolated Linear Sensing IC | |
| Fabricantes | Agilent(Hewlett-Packard) | |
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Agilent HCPL-7520
Isolated Linear Sensing IC
Data Sheet
Description
The HCPL-7520 isolated linear
current sensing IC family is
designed for current sensing in
low-power electronic motor
drives. In a typical implementa-
tion, motor current flows through
an external resistor and the
resulting analog voltage drop is
sensed by the HCPL-7520. An
output voltage is created on the
other side of the HCPL-7520
optical isolation barrier. This
single-ended output voltage is
proportional to the motor
current. Since common-mode
voltage swings of several hundred
volts in tens of nanoseconds are
common in modern switching
inverter motor drives, the HCPL-
7520 was designed to ignore very
high common-mode transient
slew rates (of at least 10 kV/µs).
The high CMR capability of the
HCPL-7520 isolation amplifier
provides the precision and
stability needed to accurately
monitor motor current in high
noise motor control environ-
ments, providing for smoother
control (less “torque ripple”) in
various types of motor control
applications.
Functional Diagram
IDD1
VDD1 1
IDD2
8 VDD2
VIN+ 2
+
+ 7 VOUT
VIN– 3
–
– 6 VREF
GND1 4
SHIELD
5 GND2
The product can also be used for
general analog signal isolation
applications. For general
applications, we recommend the
HCPL-7520 (gain tolerance of
±5%). The HCPL-7520 utilizes
sigma delta (Σ-∆) analog-to-
digital converter technology to
delivery offset and gain accuracy
and stability over time and
temperature. This performance is
delivered in a compact, auto-
insert, 8-pin DIP package that
meets worldwide regulatory
safety standards. (A gull-wing
surface mount option #300 is
also available).
Features
• 15 kV/µs common-mode rejection
at Vcm = 1000 V
• Compact, auto-insertable 8-pin
DIP package
• 60 ppm/°C gain drift vs.
temperature
• –0.6 mV input offset voltage
• 8 µV/°C input offset voltage vs.
temperature
• 100 kHz bandwidth
• 0.06% nonlinearity, single-ended
amplifer oon
• Worldwide safety approval:
UL 1577 (3750 Vrms/1 min.) and
CSA (pending), DIN EN 60747-5-2
(Option #060 only pending)
• Advanced sigma-delta (Σ-∆)
A/D converter technology
Applications
• Low-power inverter current
sensing
• Motor phase and rail current
sensing
• Switched mode power supply
signal isolation
• General purpose low-power
current sensing and monitoring
• General purpose analog signal
isolation
CAUTION: It is advised that normal static precautions be taken in handling and assembly of this
component to prevent damage and /or degradation which may be induced by ESD.
1 page  
Insulation and Safety Related Specifications
Parameter
Symbol Value
Minimum External Air Gap
(clearance)
L(101) 7.4
Minimum External Tracking
(creepage)
L(102) 8.0
Minimum Internal Plastic Gap
(internal clearance)
0.5
Unit
mm
mm
mm
Tracking Resistance
(comparative tracking index)
Isolation Group
CTI
>175 V
IIIa
Conditions
Measured from input terminals to output terminals,
shortest distance through air.
Measured from input terminals to output terminals,
shortest distance path along body.
Through insulation distance conductor to conductor,
usually the straight line distance thickness between the
emitter and detector.
DIN IEC 112 Part 1
Material Group (DIN EN 0110-1/1997-04)
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Temperature
Supply Voltage
Steady-State Input Voltage
Two Second Transient Input Voltage
Output Voltage
Reference Input Voltage
Reference Input Current
Lead Solder Temperature
Solder Reflow Temperature Profile
Symbol
Min. Max.
TS –55 125
TA –40 100
VDD1_max, VDD1_max
0
6
VIN+, VIN-
–2.0 VDD1 + 0.5-
VIN+, VIN-
–6.0 VDD1 + 0.5-
VOUT
–0.5 VDD2 + 0.5-
VREF 0.0 VDD2 + 0.5-
IREF 20-
260°C for 10 sec., 1.6 mm below seating plane
See Package Outline Drawings section
Units
°C
°C
V
V
V
V
V
mA
Note
Recommended Operating Conditions
Parameter
Operating Temperature
Supply Voltage
Input Voltage (accurate and linear)
Input Voltage (functional)
Reference Input Voltage
Symbol
TA
VDD1, VDD2
VIN+, VIN-
VIN+, VIN-
VREF
Min.
–40
4.5
–200
–2.0
4.0
Max.
85
5.5
200
2.0
VDD2
Units
°C
V
mV
V
V
Note
5
5 Page 
As shown in Figure 17, 0.1 µF
bypass capacitors (C1, C2)
should be located as close as
possible to the pins of the
HCPL-7520. The bypass
capacitors are required because
of the high-speed digital nature
of the signals inside the HCPL-7520.
A 0.01 µF bypass capacitor (C2) is
also recommended at the input due
to the switched-capacitor nature
of the input circuit. The input
bypass capacitor also forms part
of the anti-aliasing filter, which is
recommended to prevent high
frequencynoisefromaliasingdownto
lower frequencies and interfering
with the input signal. The input filter
also performs an important
reliability function—it reduces
transient spikes from ESD events
flowing through the current
sensing resistor.
PC Board Layout
The design of the printed circuit
board (PCB) should follow good
layout practices, such as keeping
bypass capacitors close to the
supply pins, keeping output
signals away from input signals,
the use of ground and power
planes, etc. In addition, the
layout of the PCB can also affect
the isolation transient immunity
(CMTI) of the HCPL-7520,
due primarily to stray capacitive
coupling between the input and
the output circuits. To obtain
optimal CMTI performance, the
layout of the PC board should
minimize any stray coupling by
maintaining the maximum
possible distance between the
input and output sides of the
circuit and ensuring that any
ground or power plane on the
PC board does not pass directly
below or extend much wider than
the body of the HCPL-7520.
HV+
FLOATING
POSITIVE
SUPPLY
GATE DRIVE
CIRCUIT
MOTOR
+ R1 -
RSENSE
U1
78L05
IN OUT
C1
0.1 µF
R5
68 Ω
HV-
C2
0.1 µF
C3
0.01 µF
1 VDD1 VDD2 8
2 VIN+ VOUT 7
3 VIN- VREF 6
4 GND1 GND2 5
HCPL-7520
+5 V
C4 C5 C6
C6 = 150 pF
C4 = C5 = 0.1 µF
µC
A/D
VREF
GND
Figure 17. Recommended HCPL-7520 application circuit.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet HCPL7520.PDF ] | |
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