ACS730 datasheet(16/18 Pages) ALLEGRO

16 / 18 page

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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 sensor

reaches 10% of its full-scale value, and b) when it reaches 90% of

its full scale value.

Response Time (tRESPONSE). The time interval between a) when

the sensed input current reaches 90% of its final value, and b)

when the sensor output reaches 90% of its full-scale value.

Propagation Delay (tpd). The time interval between a) when the

sensed input current reaches 20% of its full-scale value, and b)

when the sensor output reaches 20% of its full-scale value.

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 3: Power-On Time (tPO)

Figure 4: Rise Time (tr) and Propagation Delay (tpd)

Figure 5: Response Time (tRESPONSE)

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