ACS712 データシートの表示（PDF） - Allegro MicroSystems
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ACS712 Datasheet PDF : 14 Pages
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ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Definitions of Dynamic Response Characteristics
Power-On Time (tPO). When the supply is ramped to its operat-
ing voltage, the device requires a finite time to power its internal
components before responding to an input magnetic field.
Power-On Time, tPO , is defined as the time it takes for the output
voltage to settle within ±10% of its steady state value under an
applied magnetic field, after the power supply has reached its
minimum specified operating voltage, VCC(min), as shown in the
chart at right.
Rise time (tr). The time interval between a) when the device
reaches 10% of its full scale value, and b) when it reaches 90%
of its full scale value. The rise time to a step response is used to
derive the bandwidth of the device, in which ƒ(–3 dB) = 0.35 / tr.
Both tr and tRESPONSE are detrimentally affected by eddy current
losses observed in the conductive IC ground plane.
200
180
160
140
120
100
80
60
40
20
0
0
10000
1000
Power on Time versus External Filter Capacitance
IP = 5 A
IP = 0 A
10
20
30
40
50
CF (nF)
Noise vs. Filter Cap
Noise versus External Filter Capacitance
100
10
1
0.01
1200
1000
800
600
400
200
0
0
0.1
1
10
100
CF (nF)
Rise Time versus External Filter Capacitance
}Expanded in chart at right
100
200
300
400
CF (nF)
1000
500
CF (nF)
0
1
4.7
10
22
47
100
220
470
tr (μs)
6.6
7.7
17.4
32.1
68.2
88.2
291.3
623.0
1120.0
I (%)
90
10
0
Primary Current
Transducer Output
t
Rise Time, tr
Step Response
TA=25°C
Output (mV)
15 A
Excitation Signal
400
350
300
250
200
150
100
50
0
0
Rise Time versus External Filter Capacitance
25
50
75
100
125
150
CF (nF)
Allegro MicroSystems, Inc.
10
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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