ACS715 查看數據表（PDF） - Allegro MicroSystems

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ACS715

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

Allegro MicroSystems 

ACS715

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor

with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

Features and Benefits

▪ Low-noise analog signal path

▪ Device bandwidth is set via the FILTER pin

▪ 5 μs output rise time in response to step input current

▪ 80 kHz bandwidth

▪ Total output error 1.5% typical at TA= 25°C

▪ Small footprint, low-profile SOIC8 package

▪ 1.2 mΩ internal conductor resistance

▪ 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8

▪ 5.0 V, single supply operation

▪ 133 to 185 mV/A output sensitivity

▪ Output voltage proportional to DC currents

▪ Factory-trimmed for accuracy

▪ Extremely stable output offset voltage

▪ Nearly zero magnetic hysteresis

▪ Ratiometric output from supply voltage

▪ Operating temperature range, –40°C to 150°C

Package: 8 Lead SOIC (suffix LC)

Approximate Scale 1:1

Description

The Allegro® ACS715 provides economical and precise

solutions for DC current sensing in automotive systems. The

device package allows for easy implementation by the customer.

Typical applications include motor control, load detection and

management, switched-mode power supplies, and overcurrent

fault protection.

The device consists of a precise, low-offset, linear Hall

sensor circuit with a copper conduction path located near the

surface of the die. Applied current flowing through this copper

conduction path generates a magnetic field which is sensed

by the integrated Hall IC and converted into a proportional

voltage. Device accuracy is optimized through the close

proximity of the magnetic signal to the Hall transducer. A

precise, proportional voltage is provided by the low-offset,

chopper-stabilized BiCMOS Hall IC, which is programmed

for accuracy after packaging.

The output of the device has a positive slope (>VIOUT(Q))

when an increasing current flows through the primary copper

conduction path (from pins 1 and 2, to pins 3 and 4), which

is the path used for current sensing. The internal resistance of

this conductive path is 1.2 mΩ typical, providing low power

loss. The thickness of the copper conductor allows survival

Continued on the next page…

Typical Application

ACS715-DS

1 IP+

8

VCC

2 IP+

7

VIOUT

IP

ACS715

3 IP– FILTER 6

4 IP– GND 5

+5 V

VOUT

CBYP

0.1 μF

CF

Application 1. The ACS715 outputs an analog signal, VOUT .

that varies linearly with the unidirectional DC primary sensed

current, IP , within the range specified. CF is recommended for

noise management, with values that depend on the application.

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