Chopper Stabilized Precision Hall Effect Switches
A1120, A1121, A1122,
A1123, and A1125
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS Valid over full operating voltage and ambient temperature ranges; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.   Typ.
1
Max.   Unit
2
Electrical Characteristics
Forward Supply Voltage
V
CC
Operating, T
J
 < 165癈
3

24
V
Output Leakage Current
I
OUTOFF
A1120
A1121
A1122
A1123
V
OUT
 = 24 V, B < B
RP


10
A1125  V
OUT
 = 24 V, B > B
OP


10
Output Saturation Voltage
V
OUT(SAT)
A1120
A1121
A1122
A1123
I
OUT
 = 20 mA, B > B
OP
    185    500    mV
A1125  I
OUT
 = 20 mA, B < B
RP
    185    500    mV
Output Current Limit
I
OM
A1120
A1121
A1122
A1123
B > B
OP
30

60
mA
A1125  B < B
RP
30

60
mA
Power-On Time
3
t
PO
V
CC
 > 3.0 V, B < B
RP
(min)  10 G,
B > B
OP
(max) + 10 G


25
Chopping Frequency
f
C
    800    
kHz
Output Rise Time
3,4
t
r
R
L
 = 820 ? C
S
 = 20 pF
    0.2    2
Output Fall Time
3,4
t
f
R
L
 = 820 ? C
S
 = 20 pF
    0.1    2
Supply Current
I
CC(ON)
A1120
A1121
A1122
A1123
V
CC
 = 12 V, B > B
OP
 


4
mA
A1125  V
CC
 = 12 V, B < B
RP


4
mA
I
CC(OFF)
A1120
A1121
A1122
A1123
V
CC
 = 12 V, B < B
RP


4
mA
A1125  V
CC
 = 12 V, B > B
OP


4
mA
Reverse Supply Current
I
RCC
V
RCC
 = 30 V


5
mA
Supply Zener Clamp Voltage
V
Z
I
CC
 = 5 mA; T
A
 = 25癈
28


V
Zener Impedance
I
Z
I
CC
 = 5 mA; T
A
 = 25癈

50

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