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A3195EU Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A3195EU
Beschreibung PROTECTED/ HIGH-TEMPERATURE/ HALL-EFFECT LATCH WITH ACTIVE PULL-DOWN
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 10 Seiten
A3195EU Datasheet, Funktion
3195
PROTECTED, HIGH-TEMP.,
3195ACTIVE PULL-DOWN
HALL-EFFECT LATCH
PROTECTED, HIGH-TEMPERATURE,
HALL-EFFECT LATCH WITH ACTIVE PULL-DOWN
LATCH
12
3
Dwg. PH-013
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC (100 ms) .......... 115 V*
(continuous) ................................... 26 V
Reverse Battery Voltage,
VRCC (100 ms) ............................ -100 V
(continuous) ................................. -30 V
Magnetic Flux Density, B ........... Unlimited
Reverse Output Voltage, VOUT ......... -0.5 V
Continuous Output Current,
IOUT ........................... Internally Limited
Package Power Dissipation,
PD ........................................ See Graph
Junction Temperature, TJ ................. 170°C
Operating Temperature Range, TA
Suffix “E–” .................... -40°C to +85°C
Suffix “L–” .................. -40°C to +150°C
Storage Temperature, TS ................. 170°C
*Fault condition, internal overvoltage shutdown
above 28 V.
These Hall-effect latches are capable of sensing magnetic fields
while using an unprotected power supply. The A3195– can provide
position and speed information by providing a digital output for mag-
netic fields that exceed their predefined switch points. These devices
operate down to zero speed and have switch points that are designed
to be extremely stable over a wide operating temperature and voltage
range. The latching characteristics make them ideal for use in pulse
counting applications when used with a multi-pole ring magnet.
A 25 mA high-side driver combined with an active pull-down is espe-
cially useful for driving capacitive loads. Output short-circuit protection
allows for an increased wiring harness fault tolerance. The tempera-
ture compensated switch points, the wide operating voltage range, and
the integrated protection make these devices ideal for use in automo-
tive applications such as transmission speed sensors and integrated
wheel bearing speed sensors.
Each monolithic device contains an integrated Hall-effect trans-
ducer, a temperature-compensated comparator, a voltage regulator,
and a buffered high-side driver with an active pull-down. Supply
protection is made possible by the integration of overvoltage shutdown
circuitry that monitors supply fault conditions. Output protection
circuitry includes source and sink current current limiting for short
circuits to supply or ground.
The A3195E– is rated for operation over a temperature range of
-40°C to +85°C; the A3195L– is rated for operation over an extended
temperature range of -40°C to +150°C. They are supplied in a three-
lead SIP (suffix –U) or a surface-mount SOT-89 (suffix –LT).
FEATURES
s Internal Protection For Automotive (ISO/DIN) Transients
s Operation From Unregulated Supply
s Reverse Battery Protection
s Undervoltage Lockout
s Supply Noise-Suppression Circuitry
s Output Short-Circuit Protection
s Output Zener Clamp
s Thermal Protection
s Symmetrical Latching Switch Points
s Operable with Multipole Ring Magnets
Always order by complete part number, e.g., A3195LU .






A3195EU Datasheet, Funktion
3195
PROTECTED, HIGH-TEMP.,
ACTIVE PULL-DOWN
HALL-EFFECT LATCH
INTERNAL PROTECTIVE FEATURES
ISO
Pulse No.
1
2
3a
3b
4
5
6
7
Test
Inductive Turn Off (Negative)
Inductive Turn Off (Positive)
Capacitive/Inductive Coupling (Neg)
Capacitive/Inductive Coupling (Pos)
Reverse Battery
Load Dump (ISO)
(DIN)
Ignition Coil Disconnect
EXTERNAL PROTECTION REQ’D
Field Decay (Negative)
Test Conditions (at TA = +25°C)
VS = -100 V, RS = 10 , tr = 1 µs, td = 2 ms
VS = 90 V, RS = 10 , tr = 1 µs, td = 50 µs
VS = -150 V, RS = 50 , tr = 50 ns, td = 100 ns
VS = 100 V, RS = 50 , tr = 50 ns, td = 100 ns
VS = -14 V, td = 20 s
VS = 86.5 V, RS = 0.5 , tr = 5 ms, td = 400 ms
VS = 120 V, RS = 0.5 , tr = 100 ns, td = 400 ms
VS = -300 V, RS = 30 , tr = 60 µs, td = 300 µs
VS = -80 V, RS = 10 , tr = 5 ms, td = 100 ms
0.9 VS
VS
0.1 VS
12 V
0
tr
td
Dwg WH-008
Power supply voltage transients, or device output short circuits, may
be caused by faulty connectors, crimped wiring harnesses, or service
errors. To prevent catastrophic failure, internal protection against
overvoltage, reverse voltage, output overloads have been incorporated
to meet the automotive 12 volt system protection requirements of ISO
DP7637/1 and DIN 40839-1. A series-blocking diode or current-limiting
resistor is required in order to survive pulse number six.
Output Overloads. Current through the output source transistor is
sensed with a low-value on-chip aluminum resistor. The voltage drop
across this resistor is fed back to control the base drive of the output
stage. This feedback prevents the output transistor from exceeding its
maximum current density rating by limiting the output current to between
-26 mA and -70 mA. Under short-circuit conditions, the device will
dissipate an increased amount of power (PD = VOUT x ILIMIT) and the
output transistor will be thermally stressed.
Current through the active pull-down is
limited to between 8 mA and 25 mA.
Overvoltage. The device protects itself
against high-voltage transients by shutting
OFF the output source driver and all supply-
referenced active components, reducing the
supply current, and minimizing device
power dissipation. Overvoltage shutdown
can occur anywhere between 28 V and
55 V and device operation above 28 V
cannot be recommended. The device will
continue to operate, with increased power
dissipation, for supply voltages above the
internal clamp voltage but below the over-
voltage shutdown. Under a sustained
overvoltage, the device may be required to
dissipate an increased amount of power
(PD = VCC x ICC) and the device may be
thermally stressed (see above).
Output Voltage. The output is
clamped with an on-chip Zener diode to
prevent supply overvoltage faults from
appearing at the output when the field is
less than BRP.
When any fault condition is removed,
the device returns to normal operating
mode.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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