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ACS752SCA-100 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer ACS752SCA-100
Beschreibung Current Sensor
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 11 Seiten
ACS752SCA-100 Datasheet, Funktion
Current Sensor: ACS752SCA-100
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
Supply Voltage, Vcc........................................... 16 V
Output Voltage ................................................... 16 V
Output Current Source ..................................... 3 mA
Output Current Sink........................................10 mA
Maximum Storage Temperature...................... 170°C
Maximum Junction Temperature .................... 165°C
Always order by complete part number:
ACS752SCA-100
The Allegro ACS752 family of current sensors provides economical and precise
solutions for current sensing in industrial, commercial, and communications sys-
tems. The device package allows easy implementation by the customer. Typical
applications include: motor control, load detection and management, switched
mode power supplies, and overcurrent fault protection.
The sensor consists of a precision linear Hall IC, which is optimized to an internal
magnetic circuit to increase device sensitivity. The combination of a precisely
controlled self-aligning assembly process (patents pending), and the factory pro-
grammed precision of the linear Hall sensor, result in high-level performance and
product uniformity.
The primary conductor used for current sensing (terminals 4 and 5) is designed
for extremely low power loss. These power terminals also are electrically isolated
from the sensor leads (pins 1, 2, and 3). This allows the ACS752 family of sen-
sors to be used in applications requiring electrical isolation, without using opto-
isolators or other costly isolation techniques.
The output of this device has a positive slope (>VCC / 2) when an increasing cur-
rent flows from terminal 4 to terminal 5.
The ACS752 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 Benefits
• Monolithic Hall IC for high reliability
• Single +5 V supply
• High isolation voltage
• Lead-free
• UL recognized
• End-of-line factory-trimmed for gain and offset
• Ultra-low power loss: low resistance of primary conductor
• Ratiometric output from supply voltage
• Low thermal drift of offset voltage
• On-chip transient protection
• Small package size, with easy mounting capability
Applications
• Industrial systems
• Motor control
• Power distribution
• Battery power systems
• Electric vehicles
ACS752100-DS Rev.3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2003, Allegro MicroSystems, Inc.






ACS752SCA-100 Datasheet, Funktion
Current Sensor: ACS752SCA-100
Definitions 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 amplifier gain (mV/G). The linear IC amplifier 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 amplifier gain (mV/G) and the noise floor for the Allegro Hall effect linear IC (≈1 G).
The noise floor 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 flux 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 flux concentrator, which becomes significant 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 (VOM): The magnetic offset is due to the residual magnetism (remnant field) of the core material. The magnetic
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 flux concentrator. The larger magnetic
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 flow at 25°C, without the effects of temperature.
0 A over temperature: Accuracy of sensing zero current flow 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 Δ temperature: Accuracy of sensing full-scale current flow including temperature effects.
ACS752100-DS Rev.3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2003, Allegro MicroSystems, Inc.
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