Agilent HCPL-7520
Isolated Linear Sensing IC
Data Sheet
Features
• 15 kV/µs common-mode rejection
at Vcm = 1000 V
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
I
DD1
V
DD1
V
IN+
V
IN–
GND1
1
2
3
4
+
–
+
–
I
DD2
8
7
V
DD2
V
OUT
V
REF
GND2
• 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
6
5
SHIELD
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).
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.
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
