A1201 Datasheet, PDF (10/13 Pages) Allegro MicroSystems – Continuous-Time Bipolar Switch Family

A1201, A1202, A1203, and A1204
Continuous-Time Bipolar Switch Family
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_CC 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_PO, 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
Sensor 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 sensors 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 Allegro’s 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.
A1201-DS, Rev. 2
Allegro MicroSystems, Inc.
10
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com