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.

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

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.

1

2

3

4

8

7

6

5

IDD1

VDD1

VIN+

VIN–

GND1

IDD2

VDD2

VOUT

VREF

GND2

+

–

+

–

SHIELD

Functional Diagram