ACS704ELC-005 Datasheet PDF - Allegro MicroSystems

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ACS704ELC-005
Allegro MicroSystems

Part Number ACS704ELC-005
Description Fully Integrated / Hall Effect-Based Linear Current Sensor
Page 20 Pages


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ACS704ELC-005
Fully Integrated, Hall Effect-Based Linear Current Sensor
with Voltage Isolation and a Low-Resistance Current Conductor
Not for New Design
These parts are in production but have been determined to be
NOT FOR NEW DESIGN. This classification indicates that sale of
this device is currently restricted to existing customer applications.
The device should not be purchased for new design applications
because obsolescence in the near future is probable. Samples are no
longer available.
Date of status change: October 31, 2006
Recommended Substitutions:www.DataSheet4U.com
For existing customer transition, and for new customers or new appli-
cations, refer to the ACS712.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.



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ACS706ELC-20A
Bidirectional 1.5 mΩ Hall Effect Based Linear Current Sensor
with Voltage Isolation and 20 A Dynamic Range
Package LC
Pin 1: IP+
Pin 2: IP+
Pin 3: IP–
Pin 4: IP–
Pin 8: VCC
Pin 7: VOUT
Pin 6: N.C.
Pin 5: GND
Pins 6 and 7 are internally connected in shipping
product. For compatibility with future devices,
leave pin 6 floating.
Nominal Operating Temperature, TA
Range E............................................ –40 to 85ºC
Overcurrent Transient Tolerance*, IP ................ 60 A
*100 total pulses, 250 ms duration each, applied at a rate of
1 pulse every 100 seconds.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 16 V
Reverse Supply Voltage, VRCC ........................ –16 V
Output Voltage, VOUT ........................................ 16 V
Reverse Output Voltage, VROUT...................... –0.1 V
Output Current Source, IOUT(Source) ................. 3 mA
Output Current Sink, IOUT(Sink).......................10 mA
Maximum Transient Sensed Current*, IR(max) ... 100 A
Operating Temperature,
Maximum Junction, TJ(max)....................... 165°C
Storage Temperature, TS ...................... –65 to 170°C
*Junction Temperature, TJ < TJ(max).
The Allegro ACS706 family of current sensors provides economical and
precise solutions for current sensing in industrial, automotive, commercial, and
communications 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 precision, 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 at the
factory.
The output of the device has a positive slope (>VCC / 2) 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 typically 1.5 mΩ, providing low power loss. The thickness
of the copper conductor allows survival of the device at up to 3× overcurrent
conditions. The terminals of the conductive path are electrically isolated from the
sensor leads (pins 5 through 8). This allows the ACS706 family of sensors to be
used in applications requiring electrical isolation without the use of opto-isolators
or other costly isolation techniques.
The ACS706 is provided in a small, surface mount SOIC8 package. The leadframe
is plated with 100% matte tin, which is compatible with standard lead (Pb) free
printed circuit board assembly processes. Internally, the flip-chip uses high-tem-
perature Pb-based solder balls, currently exempt from RoHS. The device is fully
calibrated prior to shipment from the factory.
Features and Benefits
Small footprint, low-profile SOIC8 package
• 1.5 mΩ internal conductor resistance
• Excellent replacement for sense resistors
• 1600 VRMS minimum isolation voltage between pins 1-4 and 5-8
• 4.5 to 5.5 V, single supply operation
• 50 kHz bandwidth
• 100 mV/A output sensitivity and 20 A dynamic range
• Output voltage proportional to ac and dc currents
• Factory-trimmed for accuracy
• Extremely stable output offset voltage
• Near-zero magnetic hysteresis
• Ratiometric output from supply voltage
TÜV America
Certificate Number:
U8V 04 12 54214 005
Use the following complete part number when ordering:
Part Number
ACS706ELC-20A
Package
SOIC8 surface mount
ACS706ELC20A-DS, Rev. 2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com



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ACS706ELC-20A
Functional Block Diagram
Pin 3 Pin 4
IP– IP–
VCC
Pin 8
+5 V
Voltage
Regulator
To all subcircuits
Amp
Out
VOUT
Pin 7
A
N.C.
Pin 6
Gain
Temperature
Coefficient
Trim Control
Offset
0.1 μF
IP+ IP+
Pin 1 Pin 2
GND
Pin 5
A Pins 6 and 7 are internally connected in shipping product.
For compatibility with future devices, leave pin 6 floating.
ACS706ELC20A-DS, Rev. 2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2



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ACS706ELC-20A
OPERATING CHARACTERISTICS
Characteristic
Symbol
Test Conditions
ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise specified
Optimized Accuracy Range
IP
Linear Sensing Range
IR
Supply Voltage
VCC
Supply Current
ICC VCC = 5.0 V, output open
Output Resistance
ROUT
IOUT = 1.2 mA
Output Capacitance Load
CLOAD VOUT to GND
Output Resistive Load
RLOAD VOUT to GND
Primary Conductor Resistance RPRIMARY TA = 25°C
RMS Isolation Voltage
VISORMS Pins 1-4 and 5-8; 60 Hz, 1 minute
DC Isolation Voltage
VISODC
PERFORMANCE CHARACTERISTICS, over operating ambient temperature range unless otherwise specified
Propagation Time
Response Time
Rise Time
Frequency Bandwidth
Sensitivity
Noise
Linearity
Symmetry
Zero Current Output Voltage
Electrical Offset Voltage
tPROP
tRESPONSE
tr
f
Sens
VNOISE
ELIN
ESYM
VOUT(Q)
VOE
IP = ±20 A, TA = 25°C
IP = ±20 A, TA = 25°C
IP = ±20 A, TA = 25°C
–3 dB, TA = 25°C; IP is 10 A peak-to-peak; no external filter
Over full range of IP, IP applied for 5 ms; TA = 25°C
Over full range of IP, IP applied for 5 ms
Peak-to-peak, TA = 25°C, no external filter
Root Mean Square, TA = 25°C, no external filter
Over full range of IP, IP applied for 5 ms
Over full range of IP, IP applied for 5 ms
IP = 0 A, TA = 25°C
IP = 0 A, TA = 25°C
IP = 0 A
Magnetic Offset Error
IERROM IP = 0 A, after excursion of 20 A
Total Output Error1
ETOT
IP = ±20 A, IP applied for 5 ms; TA = 25°C
IP = ±20 A, IP applied for 5 ms
Min.
–20
–20
4.5
5
4.7
1600
94
98
–15
–50
Typ. Max.
5.0
8
1
1.5
2500
5000
20
20
5.5
10
2
10
3.15
6
6.56
50
100
70
12.5
±1
100
VCC / 2
±0.01
±1.5
106
±3.5
102
15
50
±0.05
±8.4
Units
A
A
V
mA
Ω
nF
kΩ
mΩ
V
V
μs
μs
μs
kHz
mV/A
mV/A
mV
mV
%
%
V
mV
mV
A
%
%
THERMAL CHARACTERISTICS2,3, TA = –40°C to 125°C, VCC = 5 V unless otherwise specified
Value – Units
Junction-to-Lead Thermal
Resistance
Mounted on the Allegro ASEK 70x evaluation board; additional
RθJL
information about reference boards and tests is available on the
5
– °C/W
Allegro Web site
Junction-to-Ambient Thermal
Resistance
RθJA
Mounted on the Allegro ASEK 70x evaluation board; additional
information about reference boards and tests is available on the
Allegro Web site
41
– °C/W
1Percentage of IP, with IP = 20 A. Output filtered. Up to a 2.0% shift in ETOT may be observed at end-of-life for this device.
2 The Allegro evaluation board has 1500 mm2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connect-
ing the layers. Performance values include the power consumed by the PWB. Further details on the board are available from the ACS704 Frequently
Asked Questions document on our website. Further information about board design and thermal performance also can be found on pages 16 and 17 of
this datasheet.
3RθJA values shown in this table are typical values, measured on the Allegro evaluation board. The actual thermal performance depends on the board
design, the airflow in the system, and thermal interactions between the sensor and surrounding components through the PCB and the ambient air. To
improve thermal performance, see our applications material on the Allegro Web site.
ACS706ELC20A-DS, Rev. 2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3



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