ACS70331 datasheet(23/26 Pages) ALLEGRO

23 / 26 page

High Sensitivity, 1 MHz, GMR-Based Current Sensor IC

in Space-Saving, Low Resistance QFN and SOIC-8 Packages

ACS70331

Allegro MicroSystems, LLC

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 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 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 bandwidth 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.

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.

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.

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 10: Power-On Time (tPO)

Figure 11: Rise Time (tr) and Propagation Delay (tpd)

Figure 12: Response Time (tRESPONSE)

Fuse Power Down Time (tFPD). The time interval between a)

when VCC goes above VCC(min) and b) when the sensor powers

down the internal fuses.

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