A1203LUA-T【PDF 10/14 页】IC SW CONTINUOUS TIME BIPO 3-SIP

Continuous-Time Bipolar Switch Family

A1202

and A1203

Allegro MicroSystems, LLC

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

The choice between continuous-time and chopper-stabilized

designs is solely determined by the application. Battery manage-

ment is an example where continuous-time is often required. In

these applications, V

is chopped with a very small duty cycle

in order to conserve power (refer to figure 4). The duty cycle

is controlled by the power-on time, t

, of the device. Because

continuous-time devices have the shorter power-on time, they

are the clear choice for such applications.

For more information on the chopper stabilization technique,

refer to Technical Paper STP 97-10, Monolithic Magnetic Hall

Sensing Using Dynamic Quadrature Offset Cancellation and

Technical Paper STP 99-1, Chopper-Stabilized Amplifiers with a

Track-and-Hold Signal Demodulator.

ADDITIONAL APPLICATIONS INFORMATION

Extensive applications information for Hall-effect devices is

available in:

" Hall-Effect IC Applications Guide, Application Note 27701

" Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead

Welding and Lead Forming, Application Note 27703.1

" Soldering Methods for Allegros Products SMT and Through-

Hole, Application Note 26009

All are provided in Allegro Electronic Data Book, AMS-702,

and the Allegro Web site, www.allegromicro.com.

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