ACS709(2013) 데이터 시트보기 (PDF) - Allegro MicroSystems

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ACS709
(Rev.:2013)

High Bandwidth, Fast Fault Response Current Sensor IC In Thermally Enhanced Package

Allegro MicroSystems 

ACS709

High Bandwidth, Fast Fault Response Current Sensor IC

In Thermally Enhanced Package

Features and Benefits

▪ Industry-leading noise performance with 120 kHz

bandwidth through proprietary amplifier and filter

design techniques

▪ Integrated shield greatly reduces capacitive coupling

from current conductor to die due to high dV/dt, and

prevents offset drift in high-side applications

▪ Small footprint surface mount QSOP24 package

▪ 2100 VRMS isolation voltage between primary current

path and sensor IC electronics

▪ 1.1 mΩ primary conductor resistance for low power loss

▪ User-settable Overcurrent Fault level

▪ Overcurrent Fault signal typically responds to an

overcurrent condition in < 2 μs

▪ Filter pin capacitor sets analog signal bandwidth

▪ ±2% typical output error

▪ 3 to 5.5 V, single supply operation

▪ Factory trimmed sensitivity, quiescent output voltage,

and associated temperature coefficients

▪ Chopper stabilization results in extremely stable

quiescent output voltage

▪ Ratiometric output from supply voltage

Package: 24 pin QSOP (suffix LF)

Approximate Scale

Description

The Allegro™ ACS709 current sensor IC provides economical

and precise means for current sensing applications in industrial,

automotive, commercial, and communications systems. The

device is offered in a small footprint surface mount package

that allows easy implementation in customer applications.

TheACS709 consists of a precision linear Hall sensor integrated

circuit with a copper conduction path located near the surface

of the silicon die. Applied current flows through the copper

conduction path, and the analog output voltage from the Hall

sensor IC linearly tracks the magnetic field generated by the

applied current. The accuracy of the ACS709 is maximized

with this patented packaging configuration because the Hall

element is situated in extremely close proximity to the current

to be measured.

High level immunity to current conductor dV/dt and stray

electric fields, offered by Allegro proprietary integrated shield

technology, guarantees low output ripple and low offset drift

in high-side applications.

The voltage on the Overcurrent Input (VOC pin) allows

customers to define an overcurrent fault threshold for the

device. When the current flowing through the copper conduction

path (between the IP+ and IP– pins) exceeds this threshold,

Continued on the next page…

Typical Application

1

IP+

NC 24

2

IP+

3

IP+

NC

FAULT_EN

23

22 Fault_EN

VCC

RH

4

IP+

VOC 21

5 IP+ ACS709 VCC 20

RL

6

IP+

IP

7

IP–

FAULT 19

VIOUT 18

COC

330 kΩ

B

0.1 μF

8

IP–

FILTER 17 VIOUT

9

IP–

VZCR 16

CF

10

IP–

11

IP–

GND 15

NC 14

1 nF

A

12

IP–

NC 13

RH, RL

CF

COC

A

Sets resistor divider reference for VOC

Noise and bandwidth limiting filter capacitor

Fault delay setting capacitor, 22 nF maximum

Use of capacitor required

B Use of resistor optional

ACS709-DS, Rev. 2

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