參數(shù)資料
型號(hào)： ACS704ELC-005
廠商： Allegro MicroSystems, Inc.
英文描述： Fully Integrated, Hall Effect-Based Linear Current Sensor with Voltage Isolation and a Low-Resistance Current Conductor
中文描述： 全集成，霍爾效應(yīng)為基礎(chǔ)的電壓絕緣及低電阻電流導(dǎo)體線性電流傳感器
文件頁(yè)數(shù)： 11/19頁(yè)
文件大小： 571K
代理商： ACS704ELC-005
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ACS704ELC015-DS, Rev. 2
ACS704ELC-015
Sensitivity (Sens).
The change in sensor output in response to a 1 A change through the primary conductor. The sensitivity is the prod-
uct of the magnetic circuit sensitivity (G / A) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is programmed at the
factory to optimize the sensitivity (mV/A) for the full-scale current of the device.
Noise (V
NOISE
).
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.
Nonlinearity (E
LIN
).
Linearity is the degree to which the voltage output from the sensor varies in direct proportion to the primary
current through its full-scale amplitude. Conversely, nonlinearity 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 current. The following equation is used to derive the nonlinearity:
Definitions of Accuracy Characteristics
100 1–
[
{
[
V
out_full-scale amperes –
V
OUT(Q)
2 (
V
out_half-scale amperes –
V
OUT(Q)
)
(
)
100
V
out_+full-scale amperes –
V
OUT(Q)
V
OUT(Q)
–
V
out_–full-scale amperes
where
V
out_full-scale amperes
= the output voltage (V) when the sensed current approximates full-scale ±I
P
.
Symmetry (E
SYM
).
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:
Quiescent output voltage (V
OUT(Q)
).
The output of the sensor when the primary current is zero. For a unipolar supply voltage, it
nominally remains at V
CC
2. Thus, V
CC
= 5 V translates into V
OUT(Q)
= 2.5 V. Variation in V
OUT(Q)
can be attributed to the resolution
of the Allegro linear IC quiescent voltage trim and thermal drift.
Electrical offset voltage (V
OE
).
The deviation of the device output from its ideal quiescent value of V
CC
/ 2 due to nonmagnetic causes.
To convert this voltage to amperes, divide by the device sensitivity, Sens.
Accuracy (E
TOT
).
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
temperature.
Accuracy of sensing full-scale current flow including temperature effects.
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