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ACS710
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Definitions of Dynamic Response Characteristics
I (%)
Primary Current
Propagation delay (t PROP ). The time required for the sensor
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
90
Transducer Output
fixed time offset and may be compensated.
0
I (%)
Propagation Time, t PROP
Primary Current
t
Response time (t RESPONSE ). The time interval between
a) when the primary current signal reaches 90% of its final
value, and b) when the sensor reaches 90% of its output
corresponding to the applied current.
90
0
Transducer Output
Response Time, t RESPONSE
t
I (%)
Primary Current
Rise time (t r ). The time interval between a) when the sensor
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
90
derive the bandwidth of the current sensor, in which ?(–3 dB) =
0.35 / t r . Both t r and t RESPONSE are detrimentally affected by eddy
current losses observed in the conductive IC ground plane.
10
0
Transducer Output
Rise Time, t r
Allegro MicroSystems, LLC
115 Northeast Cutoff
t
21
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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