ACS770 datasheet(22/29 Pages) ALLEGRO

22 / 29 page

Thermally Enhanced, Fully Integrated, Hall Effect-Based

High Precision Linear Current Sensor IC with 100 µΩ Current Conductor

ACS770xCB

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Output Voltage versus Sampled Current

Total Output Error at 0 A and at Full-Scale Current

Increasing VIOUT(V)

+IP (A)

Accuracy

25°C Only

Accuracy

25°C Only

Accuracy

25°C Only

Accuracy

0 A

v r

O e ∆Temp erature

Average

VIOUT

–IP (A)

v r

O e ∆Temp erature

v r

O e ∆Temp erature

Decreasing VIOUT(V)

IP(min)

IP(max)

Half Scale

Definitions of Dynamic Response Character-

istics

POWER-ON DELAY (tPOD)

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 Delay, tPOD , is defined as the time it takes for the out-

put 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.

TEMPERATURE COMPENSATION POWER-ON TIME

(tTC )

After Power-On Delay, tPOD, elapses, tTC also is required before a

valid temperature compensated output.

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.

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 applied current reaches

80% of its final value, and b) when the sensor reaches 80% of its

output corresponding to the applied current.

PROPAGATION DELAY (tPROP)

The time interval between a) when the input current reaches 20%

of its final value, and b) when the output reaches 20% of its final

value.

POWER-ON RESET VOLTAGE (VPOR )

At power-up, to initialize to a known state and avoid current

spikes, the ACS770 is held in Reset state. The Reset signal is

disabled when VCC reaches VUVLOH and time tPORR has elapsed,

allowing output voltage to go from a high impedance state

into normal operation. During power-down, the Reset signal is

enabled when VCC reaches VPORL, causing output voltage to

go into a high impedance state. (Note that a detailed description

of POR and UVLO operation can be found in the Functional

Description section.)

Applied Magnetic Field

Transducer Output

(%)

Propagation Delay, tPROP

Rise Time, tr

ACS770 Datasheet(PDF) 22 Page - Allegro MicroSystems

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