Chopper-Stabilized, Precision Hall-Effect Switch
A3340
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Operating Characteristics, valid over T
A
, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ.
1
Max. Units
Electrical Characteristics
Supply Voltage Range
2
V
CC
Operating, T
J
< 165°C 4.2 – 24 V
Output Leakage Current I
OFF
V
OUT
= 24 V, B > B
OP
––10μA
Output Saturation Voltage V
OUT(SAT)
I
OUT
= 20 mA, B < B
RP
– 270 500 mV
Output Current Limit I
OM
B < B
RP
30 – 60 mA
Power-On Time t
PO
V
CC
> 4.2 V – – 50 μs
Chopping Frequency f
C
– 340 – kHz
Output Rise Time t
r
R
LOAD
= 820 Ω, C
LOAD
= 20 pF – 0.2 2.0 μs
Output Fall Time t
f
R
LOAD
= 820 Ω, C
LOAD
= 20 pF – 0.1 2.0 μs
Supply Current I
CC
B < B
RP
, V
CC
= 12 V – 3.0 6.0 mA
B > B
OP
, V
CC
= 12 V – 4.0 6.0 mA
Reverse Battery Current I
RCC
V
RCC
= –30 V – – -5.0 mA
Zener Voltage V
ZD
V
Z
+ V
D
, I
CC
= 15 mA, T
A
= 25°C 28 32 37 V
Zener Impedance Z
ZD
Z
Z
+ Z
D
, I
CC
= 15 mA, T
A
= 25°C – 50 – Ω
Magnetic Characteristics
3
Operate Point
4
B
OP
–3550 G
Release Point
4
B
RP
5.0 25 – G
Hysteresis B
hys
B
OP
– B
RP
–6– G
1
Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as T
A
= 25°C and V
CC
=
12 V. Performance may vary for individual units, within the specified maximum and minimum limits.
2
Maximum voltage must be adjusted for power dissipation and junction temperature.
3
1 G (gauss) = 0.1 mT (millitesla).
4
B
OP
= operate point (output turns off); B
RP
= release point (output turns on).
