ACS754 datasheet(7/9 Pages) ALLEGRO

7 / 9 page

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-200

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Definitions of Dynamic Response Characteristics

Propagation delay (tPROP). The time required for the device

output to reflect a change in the primary current signal. Propaga-

tion delay is attributed to inductive loading within the linear IC

package, as well as in the inductive loop formed by the primary

conductor geometry. Propagation delay can be considered as a

fixed time offset and may be compensated.

Primary Current

Transducer Output

I (%)

Propagation Time, t

PROP

Primary Current

Transducer Output

I (%)

Response Time, tRESPONSE

Primary Current

Transducer Output

I (%)

Rise Time, tr

Rise time (tr). The time interval between a) when the device

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 device, 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.

Output Voltage versus Sampled Current

Accuracy at 0 A and at Full-Scale Current

Increasing V

IOUT(V)

P (A)

Accuracy

25°C Only

Accuracy

25°C Only

Accuracy

25°C Only

Accuracy

0 A

Temp erature

Average

IOUT

–I

P (A)

Temp erature

Decreasing V

IOUT(V)

IP(min)

IP(max)

Full Scale

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