Current Sensors.pdf

Sensors 2013 Semiconductor Systems GmbH Adlerweg 1, 79856 Hinterzarten

Hall-IC based

Current Sensor Solutions

Overview


Hallsensor based current sensors

1 ACS-Modules Range: 5..200A

• Fully Integrated system • Quasi-closed magnetic loop • Measurement of B-Field at the conductor in the modul • Single Hall element

2 „Ferrite core“ custom solutions

Range: 10A…some 1000A

• Hallsensor current sensing in slotted ferrite core • custom-specific core according requirements • High isolation voltage feasible

ACS-Modules

Core-Solutions


• Complete internal signal processing • Unipolar supply +5VDC or +3VDC • Bi-directional or unidirectional version available • Fulfils UL-safety specifications • High bandwidth up to 120kHz • Automotive grade • Small footprint, low-profile SOIC8 package • Temperatur range up to +150°C

Sensor in ELC-Package (SOIC8 foot print)

3mm

1.1 ACS-Modules

Packaging options

Das Bild kann zurzeit nicht angezeigt werden.

3mm


• Surface mount packages with integrated ~1 mΩ conductors for reduced power loss

• Isolation for line powered applications • <2% typical error over industrial temp range • Low noise, 80 to 120 kHz bandwidth sensors • Single chip solution saves space and BOM costs • Small size relative to current transformers

1.3 ACS-Modules

Allegro Flip Chip devices < 60A

Flip Chip: Strong Magnetic Coupling


• 1,2mΩ internal conductor resistance • Current proportional output voltage • Integrated shield against capacitive coupling • 80KHz bandwidth (adjustable) • Sensitivity 66-185mV/A • <3% Error over full TA range • Isolation voltage: 2.1kV RMS • Nearly zero magnetic hysteresis •

• ACS714/715: automotive qualified versions with AECQ-100 and enhanced temperature range of -40°C...+150°C

Up to +/-30A in SOIC8 Package

1.3 ACS-Modules

Current range up to +/-30A

ACS712 (AC/DC) ACS713 (DC)


3.3 V operation (5V capable). -40 to 150 °C Optimized for lower current systems:

+/- 5 A offering 10 A uni-directional offering Other gain options also possible, 50 A maximum

Patented piecewise temperature coefficient trim of gain and offset at Allegro: 2% typical output error possible.

Improved filters reduce output noise relative to ACS712. 2 bandwidth options selectable through external pin. 80kHz option and 20 kHz option.

Reduced power loss and improved voltage isolation: Internal conductor of 0.75 mΩ. Creepage increased to 4 mm relative to ACS712 (2mm).

1.3 ACS-Modules

New Package - Current range up to 50A

ACS722

Cre

epag

e ~

4 m

m

Wider Conductor Improves Power Loss and Fusing Current


1.3 ACS-Modules

New Package - Current range up to 50A

ACS722

ACS722 Testboard Layout

ACS722 Pinout


• Cost saving shunt-replacement • 1,2mΩ internal conductor resistance • Separate Fault-output for fast overcurrent detection (<2µs) • 100KHz bandwidth • +/- 12,5A and +/- 25A devices available • Output voltage proportional to AC or DC currents • Integrated shielding against capacitive coupling • +3.3…5VDC supply voltage • Nearly zero magnetic hysteresis • Temperature range: -40°C...+125°C

ACS711 in SOIC8

up to +/-25A in SOIC8 package

FAULT Output

1.3.1 ACS-Modules

Shunt replacement for industrial applications


• World’s smallest fully integrated current sensor IC • 0.6 mΩ conductor resistance

Reduced ohmic heating and power loss • Output voltage proportional to applied current

Can sense AC or DC currents +/- 15A and +/- 31A devices available

• Integrated Fault pin for over current detection +/- 100% full scale trip point <5 us response time (“no smoke applications”)

• Up to 100 VPEAK galvanic isolation for economical • Low noise, 100 kHz current sensor • < ±4% typical error over -40°C to 125°C range

ACS711 in 3x3mm QFN

1.3.1 ACS-Modules

Shunt replacement

Not suitable for line powered applications

3 x 3 QFN Package

ACS700EEX Low current version of the ACS711 - 9A in SOIC: with bidirectional range - 6A in QFN: with unidirectional and bidirectional range


• Package Thermal Resistance allows for 40Amp continuous current at 85°C ambient temperature

• Over current capable to 200Amps for pulse duration up to 10ms/10%DC up to 10 events

• 1.2mOhm primary conductor resistance

ACS711 Sustainable Pulsed DC Primary Current Rates

Current Amplitude (A)

Pulse Duration (mS)

Duty Cycle (%)

Maximum Number of Pulses

60 1000 10 Unlimited 120 20 10 Unlimited 200 10 10 10 200 10 1 Unlimited 100 10 10 Unlimited

Big Thermal Performance in Small Package ACS711

1.3.1 ACS-Modules

Shunt replacement


Typical Application

Load

• High isolation voltage, suitable for line-powered applications (Basic isolation) • Fast overcurrent detection (2µs) on separate output • Latching and Non-Latching fault version available • Adjustable overcurrent threshold (35-70A) • Adjustable Bandwidth up to 120kHz, • Output voltage proportional to AC or DC currents • 3 to 5.5 V, single supply operation • Temperature range: –40°C..+125°C

ACS709/710/716

ACS716 is the ACS710 optimized for 3.3V Operation ACS709 is the automotive grade (150°C) version of the ACS710 in a 24 Pin QSOP package

ACS710 in 16 Pin-SOIC-Package for industrial use

1.3.2 ACS-Modules

Sensors with fast overcurrent output

ACS709 in 24 Pin-QSOP-Package for automotive use


ACS709LLFTR Bi-directional

ACS710/716LATR Bi-directional

ACS722XLCTR Uni/Bi-directional

ACS711LCTR Bi-directional

ACS711 QFN Bi-directional

ACS712ELC Bi-directional

ACS713ELC Uni-directional

Current Range +/-20A und +/-35A

+/-6,5A; +/-12,5A; +/-25A

(optimized Range)

+/-5 to +/-40A

+/-12,5A und +/-25A

+/-15A und +/-31A

+/-5A; +/-20A +/-30A

+20A und +30A

Overcurrent ability TBD

200A (Transient 20ms)

TBD 100A (Transient 100 ms)

TBD 120A (Transient 20

ms)

120A (Transient 20 ms)

Bandwidth (kHz) 120 120 80 / 20 Einstellbar über BW-

Select Pin

100 100 80 Einstellbar über

Filterpin

80 Einstellbar über

Filterpin Conductor resistance (mΩ)

1,1 1,0 0,6 1,2 0,6 1,2 1,2

Response time (µs) (90% Fullscale)

<2 (Fault Output)

<2 (Fault Output)

<2 (Fault Output)

3 (Fault Output)

<5 (Fault Output)

5 5

Turn-On time (µs) IP=0A

35µs 35µs 35µs 35µs 35µs 35µs 35µs

Error@25°C Incl.Offsets (%)

+/-1,0 +/-1,0 <1,0 +/-1,5 +/-1,5 +/-1,5 +/-1,5

Supply Voltage (V) +3,0…5,5 3,3V(ACS716) & 5V 3,3V or 5V +3,3…5 +3,3 +5 +5 Isolation (Vmin) 2100 3000 2,2 - 2,5kVrms ~100V peak ~100V peak 2100 2100 Weight (g) 0.13 <1,0 <1,0 <1,0 <1,0 0,73 0,73 Remarks - Automotive

- Separate over current-output

Separate over current output (ACS722 BW select), very low noise

Automotive Version: ACS714/15 up to +150°C

1.2 ACS-Modules

5..40A Sensor overview

LA/LC-Package


1.3.3 ACS-Modules

Fully Differential Sensor with adjustable Gain

• Galvanically isolated Current Sensor IC with differential

output and externally adjustable gain. • Externally adjustable gain and bandwidth using simple RC networks. Full scale output swing for 2 A to >40 A • 3,3V operation, -40..+150°C • 1,1mOhm conductor resistance for very low power loss • High level of immunity to common mode field • <2% typical accuracy over temperature • 120KHz BW analog output • Integrated Temperature Compensation

ACS726

Adjustable Signal path


1.3.4 ACS-Modules

Current Sensor for Server and Sub-Racks (Hot Swap)

Typical Application

Load current

• Hall-effect current monitor - no external sense resistor • High-side FET gate driver • 240VA power fault protection with user-selectable delay • POWER GOOD indication • Analog output voltage (factory trimmed for gain and offset) proportional to applied current • User controlled soft start / hot-swap function • 10.8 to 13.2 V, single-supply operation

ACS761

The integrated protection in the ACS761 incorporates three levels of fault protection: • Power Fault with user-selectable delay • Overcurrent Fault threshold with user selectable delay • Short circuit protection, which disables the gate in less than

2 µs. These faults are indicated to the host system via the Fault pin and are cleared upon reasserting enable high.


• DC and AC versions available • High isolation voltage of 3.0 kV RMS • Extremely stable output offset voltage • Improved noise performance • 100 µΩ integrated conductor, galvanic isolation

for line powered systems • 120 kHz typical bandwidth • 3 µs output rise time in response to step input

current • 3.3V (ACS759) to 5.5V, single supply • Automotive qualification and TA= up to 150°C

ACS756/758/759

1.4 ACS-Modules

50..200A Sensors

Coming soon: ACS770 Same package but piecewise linear temperature compensation for higher accuracy.


CA/CB-package

ACS756xCA Bi-directional

ACS758xCB Bi-directional

ACS759xCB Bi-directional

ACS758xCB-U Uni-directional

Current Range +/-50A, +/-100A

+/-50A bis +/-200A

+/-50A bis +/-200A

+50A bis +200A

Overcurrent ability 1200A @ 25°C (Transient 1000 ms)

1200A @ 25°C (Transient 1000 ms)



Bandwidth (kHz) 120 120 120 120

Conductor resistance (µΩ)

130 100 100 100

Response time (µs) (90% Fullscale)

3 3 3 3

Turn-On time (µs) IP=0A

35µs 35µs 35µs 35µs

Error@25°C Incl. Offsets (%)

+/-1,0 +/-1,0 +/-1,0 +/-1,0

Supply Voltage (V) +5 +5 +3,3 +5

Isolation (Vmin) 3000 3000 3000 3000

Weight (g) 4,18 4,18 4,18 4,18

Remarks ACS758 offers automotive qualification (AEC-Q100)

1.2 ACS-Modules

50..200A Sensor overview


Advantages: • Cost saving system for high currents >200A • Linear Hallsensor A136x optimized for current sensing • Very small core-gap possible because of new 1mm SIP-package • Wide sensor sensitivity up to 16mV/G for individual current ranges • Bandwidth up to 120kHz, adjustable by user

2. Ferrite core custom solutions

Linear Hall sensor with ferrite core

Specific slotted ferrite cores

+ Cores are available in customer specific dimensions for optimized mechanical solutions. + Available for small- and high volume production. + Magnetic design via 3D-FEM Tools


• Low-Noise Linear Hall with up to 120kHz bandwidth • Programmability at end-of-line for offset and sensitivity • Factory programmed 0% / °C sensitivity temp. coefficient • Selectable unipolar or bipolar quiescent voltage levels • Ratiometric sensitivity, quiescent voltage output, and clamps for interfacing with application DAC • 1 mm case thickness provides better coupling for current sensing applications • ASIL Support for full diagnosis of signal path available

2.1 Ferrite core custom solutions

Linear Current Hall sensor A136x

Plastic molded Lead Bar for alignment during shipment

1 mm “thin” package for enhanced accuracy


• Piecewise linear temperature compensation will result in a highly accurate current sensor IC.

• Error within each temperature range can be linearly compensated: - Zero Amp output (Qvo) - Sensitivity (gain)

• Theoretical offset drift over temperature can be extremely small with this patented piecewise linear temperature compensation technique, employed in many new Allegro products.

• On request: maximum performance available using multi-temperature testing (advanced testing) allows Allegro to offer cost competitive open loop current sensor solutions with the performance level of a closed loop sensor.


Next Generation 120kHz Bandwidth Current Sensor IC A1363

Piecewise linear temperature compensation

A136x in TSSOP8 package


By using customer specific cores numerous mechanical designs are possible:

Multilayer-PCB

Two redundant sensors or second current range Sensor

System 5) in plastic molded version

4)

2)

3)

Busbar

6)


Possible ferrite core configurations

Busbar

5) PCB

PCB

Molded Toroid Version

Sensor 1) PCB


Several customer specific core solutions has been realized last few years for automotive and industrial applications.

2.1 Realized SiFe core custom solutions - Examples

1100A Prototype

500A Prototype


2.2 Customer Programming boards for Core systems

Programming Tool for Production

Interface Board

Calibration Board

Power Supply (Included)

Allegro Programming Tool for Evaluation and Test

ASEK-Board


Advantages

Flexible design from small

to high current range

Scaleable Current range

Small and smart system

design

No/small hysteresis

effects

Galvanic decoupling

Little power loss Economic solution

Further advantages • Reduced noise for higher resolution • Fast response for protection purpose • Internal isolation and signal conditioning – useable for measurement of inductive loads • and High-Side-measurement • Integrated shield for applications with high di/dt, e.g. PWM motor control • Very low primery conductor resistance – 100µΩ (ACS75x), 0,6mΩ (ACS711) • Minimal space requirements also for high current sensor systems

AC and DC current

measurement


Frequently Asked Questions and Applications Notes are available on our website at:

www.allegromicro.com

2.3 Customer Support

ACS7XX Demo Board Available from Allegro On-line store

ACS711QFN Demo Board for Breadboard


KONTAKT:

SSG SEMICONDUCTOR SYSTEMS GMBH

Adlerweg 1

D-79856 Hinterzarten

Phone: +49(0)7652-9106-10

Fax: +49(0)7652-9106-510

Web: www.ssg-de.com

Haftungsbeschränkung

Alle Informationen von SSG Semiconductor Systems GmbH sind mit größter Sorgfalt erstellt. SSG Semiconductor Systems GmbH haftet nicht für Schäden, die direkt oder indirekt aus der Benutzung dieser Informationen entstehen, soweit diese nicht auf Vorsatz oder grober Fahrlässigkeit von SSG Semiconductor Systems GmbH beruhen. Die vorliegenden Informationen, Ingenieurdienstleistungen, bzw. Produkte werden

ausschließlich für Entwicklungszwecke bereitgestellt. Die Verwendungseignung muss in der dafür vorgesehenen Anwendung kundenseitig validiert werden.

.

http://www.ssg-de.com/



Documents

Current Sensors.pdf