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ACS750SCA-075 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer ACS750SCA-075
Beschreibung Current Sensor
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
ACS750SCA-075 Datasheet, Funktion
Current Sensor: ACS750xCA-075
4
5
Pin 1: VCC
Pin 2: Gnd
Pin 3: Output
123
Terminal 4: Ip+
Terminal 5: Ip-
ABSOLUTE MAXIMUM RATINGS
Operating Temperature
S ..................................................... –20 to +85ºC
L ................................................... –40 to +150ºC
Supply Voltage, Vcc........................................... 16 V
Reverse Supply Voltage, VRCC ........................ –16 V
Output Voltage ................................................... 16 V
Reverse Output Voltage, VROUT...................... –0.1 V
Output Current Source ..................................... 3 mA
Output Current Sink........................................10 mA
Maximum Storage Temperature...........–65 to 170°C
Maximum Junction Temperature .................... 165°C
Always order by complete part number:
ACS750SCA-075
ACS750LCA-075
The Allegro ACS75x 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, 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 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 terminal 4 to
terminal 5), which is the path used for current sensing. The internal resistance of
this conductive path is typically 130 µ, providing low power loss. The thickness
of the copper conductor allows survival of the device at up to 5× overcurrent
conditions. The terminals of the conductive path are electrically isolated from the
sensor leads (pins 1 through 3). This allows the ACS75x family of sensors to be
used in applications requiring electrical isolation without the use of opto-isolators
or other costly isolation techniques.
The deviwcwew.iDsatafSuhelelty4U.ccoamlibrated prior to shipment from the factory. The ACS75x
family is lead-free. All leads are coated with 100% matte tin, and there is no lead
inside the package. The heavy gauge leadframe is made of oxygen-free copper.
Features and Benets
• Monolithic Hall IC for high reliability
• Single +5 V supply
• 3 kVRMS isolation voltage between terminals 4/5 and pins 1/2/3
• Lead-free
• Automotive temperature range available
• End-of-line factory-trimmed for gain and offset
• Ultra-low power loss: 130 µinternal conductor resistance
• Ratiometric output from supply voltage
• Extremely stable output offset voltage
• Small package size, with easy mounting capability
• Output proportional to ac and dc currents
TÜV America
Certicate Number:
U8V 04 11 54214 002
Applications
• Industrial systems
• Motor control
• Power conversion
• Battery monitors
• Automotive systems
ACS75075-DS Rev. 7
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000






ACS750SCA-075 Datasheet, Funktion
Current Sensor: ACS750xCA-075
Denitions of Accuracy Characteristics
Sensitivity (Sens): The change in sensor output in response to a 1A change through the primary conductor. The sensitivity is the
product of the magnetic circuit sensitivity (G /A) and the linear IC amplier gain (mV/G). The linear IC amplier gain is trimmed at the
factory to optimize the sensitivity (mV/A) for the full-scale current of the device.
Noise (VNOISE): The product of the linear IC amplier gain (mV/G) and the noise oor for the Allegro Hall effect linear IC (1 G).
The noise oor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mV) by the sensitivity (mV/
A) provides the smallest current that the device is able to resolve.
Linearity (ELIN): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through
its full-scale amplitude. Linearity reveals the maximum deviation from the ideal transfer curve for this transducer. Nonlinearity in the
output can be attributed to the gain variation across temperature and saturation of the ux concentrator approaching the full-scale cur-
rent. The following equation is used to derive the linearity:
{ [ [ {100 1– gain × % sat (Vout_full-scale amperes – VOUT(Q) )
2 (Vout_half-scale amperes VOUT(Q) )
where
gain = the gain variation as a function of temperature changes from 25ºC,
% sat = the percentage of saturation of the ux concentrator, which becomes signicant as the current
being sensed approaches full-scale ±IP , and
Vout_full-scale amperes = the output voltage (V) when the sensed current approximates full-scale ±IP .
Symmetry (ESYM): The degree to which the absolute voltage output from the sensor varies in proportion to either a positive or nega-
tive full-scale primary current. The following equation is used to derive symmetry:
[ [100
Vout_+full-scale amperes VOUT(Q)
VOUT(Q) Vout_–full-scale amperes
Quiescent output voltage (VOUT(Q)): The output of the sensor when the primary current is zero. For a unipolar supply voltage, it
nominally remains at VCC 2. Thus, VCC = 5 V translates into VOUT(Q) = 2.5 V. Variation in VOUT(Q) can be attributed to the resolution
of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift.
Electrical offset voltage (VOE): The deviation of the device output from its ideal quiescent value of VCC 2 due to nonmagnetic causes.
Magnetic offset error (IERROM): The magnetic offset is due to the residual magnetism (remnant eld) of the core material. The mag-
netic offset error is highest when the magnetic circuit has been saturated, usually when the device has been subjected to a full-scale or
high-current overload condition. The magnetic offset is largely dependent on the material used as a ux concentrator. The larger mag-
netic offsets are observed at the lower operating temperatures.
Accuracy (ETOT): The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the
total ouput error. The accuracy is illustrated graphically in the Output Voltage versus Current chart on the following page.
Accuracy is divided into four areas:
0 A at 25°C: Accuracy of sensing zero current ow at 25°C, without the effects of temperature.
0 A over temperature: Accuracy of sensing zero current ow including temperature effects.
Full-scale current at 25°C: Accuracy of sensing the full-scale current at 25°C, without the effects of temperature.
Full-scale current over temperature: Accuracy of sensing full-scale current ow including temperature effects.
ACS75075-DS Rev. 7
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6

6 Page









ACS750SCA-075 pdf, datenblatt
Current Sensor: ACS750xCA-075
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889;
5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2004, 2005, AllegroMicrosystems, Inc.
ACS75075-DS Rev. 7
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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