High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

14

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

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.

voltage to settle within ±10% of its steady state value under an

applied magnetic field, after the power supply has reached its

chart at right (refer to Figure 4).

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 (refer to Figure 5). The rise time to a step response is used

to derive the bandwidth of the current sensor IC, in which ƒ(–3

eddy current losses observed in the conductive IC ground plane.

The propagation delay is measured as the time interval between:

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 (refer to Figure 5).

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 (refer to

Figure 6).

V

t

0

minimum specified operating voltage

within ±10% of its steady state value

under an applied magnetic field

Primary Current

90

0

(%)

Response Time, tRESPONSE

t

Primary Current

90

10

20

0

(%)

Propagation Delay, tpd

Rise Time, tr

t

Figure 4: Power-On Time

Figure 5: Rise Time and Propagation Delay

Figure 6: Response Time