ACS722 查看數據表（PDF） - Allegro MicroSystems
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比赛名单
ACS722
Allegro MicroSystems
ACS722 Datasheet PDF : 22 Pages
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ACS722
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS
Power-On Time (tPO)
When the supply is ramped to its operating 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 sensor IC 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 band-
width of the current sensor IC, 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.
Propagation Delay (tpd )
The propagation delay is measured as the time interval a) when
the primary current signal reaches 20% of its final value, and b)
when the device reaches 20% of its output corresponding to the
applied current.
Response Time (tRESPONSE)
The time interval between a) when the primary current signal
reaches 90% of its final value, and b) when the device reaches
90% of its output corresponding to the applied current.
V
VCC(typ.)
90% VIOUT
VCC
VIOUT
VCC(min.)
tPO
t1
t2
t1= time at which power supply reaches
minimum specified operating voltage
t2= time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
0
Figure 3: Power-On Time (tPO)
t
(%)
Primary Current
90
VIOUT
Rise Time, tr
20
10
0
Propagation Delay, tpd
t
Figure 4: Rise Time (tr) and Propagation Delay (tpd )
(%)
Primary Current
90
VIOUT
Response Time, tRESPONSE
0
t
Figure 5: Response Time (tRESPONSE)
Allegro MicroSystems, LLC
20
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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