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Continuous-Time Bipolar Switch
A1205
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
the field is reduced beyond the B
OP
 level, the device switches
back to the low state.
The typical output behavior of the A120x devices is latching.
However, the A120x family is designed to attain a small hys-
teresis, and thereby provide more sensitive switching. Although
this means that true latching behavior cannot be guaranteed in all
cases, proper switching can be ensured by use of both south and
north magnetic fields, as in a ring magnet. The hysteresis of the
A120x family allows clean switching of the output, even in the
presence of external mechanical vibration and electrical noise.
Bipolar devices adopt an indeterminate output state when pow-
ered-on in the absence of a magnetic field or in a field that lies
within the hysteresis band of the device.
For more information on Bipolar switches, refer to Application
Note 27705, Understanding Bipolar Hall Effect Sensor ICs.
CONTINUOUS-TIME BENEFITS
Continuous-time devices, such as the A120x family, offer the
fastest available power-on settling time and frequency response.
Due to offsets generated during the IC packaging process, contin-
uous-time devices typically require programming after packaging
to tighten magnetic parameter distributions. In contrast, chop-
per-stabilized switches employ an offset cancellation technique
on the chip that eliminates these offsets without the need for
after-packaging programming. The tradeoff is a longer settling
time and reduced frequency response as a result of the chopper-
stabilization offset cancellation algorithm.
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 2). The duty cycle
is controlled by the power-on time, t
PO
, of the device. Because
Figure 2. Continuous-Time Application, B < B
RP
.. This figure illustrates the use of a quick cycle for chopping V
CC
 in order to conserve battery power.
Position 1, power is applied to the device. Position 2, the output assumes the correct state at a time prior to the maximum Power-On Time, t
PO(max)
.
The case shown is where the correct output state is HIGH
 
. Position 3, t
PO(max)
 has elapsed. The device output is valid. Position 4, after the output is
valid, a control unit reads the output. Position 5, power is removed from the device.
V
CC
 
V
OUT
 
Output Sampled
1
5
4
2
 
t
t
t
PO(max)
3
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