ACS756 データシートの表示（PDF） - Allegro MicroSystems
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ACS756 Datasheet PDF : 11 Pages
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ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 3 kVRMS Voltage 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.
I (%)
90
10
0
Primary Current
Transducer Output
t
Rise Time, tr
Propagation delay (tPROP). The time required for the device
output to reflect a change in the primary current signal. Propaga-
tion delay is attributed to inductive loading within the linear IC
package, as well as in the inductive loop formed by the primary
conductor geometry. Propagation delay can be considered as a
fixed time offset and may be compensated.
I (%)
90
Primary Current
Output Voltage versus Sampled Current
Total Output Error at 0 A and at Half-Scale Current
–IP (A)
Accuracy
Over $Temp erature
IP(min)
Accuracy
25°C Only
Increasing VIOUT(V)
Accuracy
25°C Only
Average
VIOUT
Accuracy
Over $Temp erature
Half Scale
IP(max)
+IP (A)
0A
Transducer Output
0
t
Propagation Time, tPROP
Accuracy
25°C Only
Accuracy
Over $Temp erature
Decreasing VIOUT(V)
Allegro MicroSystems, Inc.
8
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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