A1120LUA-T【PDF 12/18 页】IC SW HALL EFFECT CHOPPER 3-SIP

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Chopper Stabilized Precision Hall Effect Switches

A1120, A1121, A1122,

A1123, and A1125

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

BYP

A112x

VOUT

GND

0.1 糉

VCC

Output

Operation

The output of the A1120, A1121, A1122, and A1123 devices

switches low (turns on) when a magnetic field perpendicular to

the Hall element exceeds the operate point threshold, B

(see

panel A of figure 1). When the magnetic field is reduced below

the release point, B

, the device output goes high (turns off).

The output of the A1125 devices switches high (turns off) when

a magnetic field perpendicular to the Hall element exceeds the

operate point threshold, B

(see panel B of figure 1). When the

magnetic field is reduced below the release point, B

, the device

output goes low (turns on).

After turn-on, the output voltage is V

OUT(SAT)

. The output tran-

sistor is capable of sinking current up to the short circuit current

limit, I

, which is a minimum of 30 mA.

The difference in the magnetic operate and release points is the

hysteresis, B

HYS ,

of the device. This built-in hysteresis allows

clean switching of the output even in the presence of external

mechanical vibration and electrical noise. Powering-on the device

in the hysteresis range (less than B

and higher than B

) will

give an indeterminate output state. The correct state is attained

after the first excursion beyond B

or B

Applications

It is strongly recommended that an external bypass capacitor be

connected (in close proximity to the Hall element) between the

supply and ground of the device to reduce external noise in the

application. As is shown in panel B of figure 1, a 0.1 糉 capacitor

is typical.

Extensive applications information for Hall effect devices is

available in:

" Hall-Effect IC Applications Guide, Application Note 27701

" Guidelines for Designing Subassemblies Using Hall-Effect

Devices, Application Note 27703.1

" Soldering Methods for Allegros Products SMT and Through-

Hole, Application Note 26009

All are provided on the Allegro Web site, www.allegromicro.com.

Figure 1. Device switching behavior. In panels A and B, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength.

This behavior can be exhibited when using an electrical circuit such as that shown in panel C.

(A)

(B)

(C)

Functional Description

HYS

OUT(SAT)

B+

V+

HYS

OUT(SAT)

B+

V+

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