ACS722 datasheet(21/23 Pages) ALLEGRO

21 / 23 page

High Accuracy, Galvanically Isolated Current Sensor IC

with Small Footprint SOIC8 Package

ACS722

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

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.

VIOUT

VCC

VCC(min.)

90% VIOUT

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

tPO

VCC(typ.)

Primary Current

VIOUT

(%)

Response Time, tRESPONSE

Primary Current

VIOUT

(%)

Propagation Delay, tpd

Rise Time, tr

Figure 6: Power-On Time (tPO)

Figure 7: Rise Time (tr) and Propagation Delay (tpd)

Figure 8: Response Time (tRESPONSE)

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