A3196LU Просмотр технического описания (PDF) - Allegro MicroSystems
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A3196LU Datasheet PDF : 12 Pages
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3197
PROTECTED, HIGH-TEMP.,
OPEN-COLLECTOR
HALL-EFFECT LATCH
Power Up Reset. These devices are de-
signed to power up with the output OFF
without regard to any magnetic field applied.
The output will remain OFF until the flux is
reduced to below BRP (S-N transition) and then
BOP is exceeded, depending on the turn-on
state of the internal latches.
Power Supply Transients (Noise);
Overvoltage and Undervoltage Lockout.
Even in protected devices, positive and
negative power supply transients that would
not normally cause physical damage can cause
logic errors in control systems. The A3197LT
and A3197LU include noise suppression
features to prevent this.
In a typical application, where the output
is externally pulled up to a regulated voltage
<28 V, the effects of power supply transients
on the device output are suppressed by turning
the output driver OFF during the first
undervoltage, VCC(UV), (or negative) condition,
or first overvoltage (positive) condition,
VCC(OV), and maintaining a power up reset
mode until normal power is restored. Note
that after the initial transient, the output does
not change logic state during subsequent
power supply noise pulses.
An external 0.1 µF to 0.5 µF capacitor,
with good high-frequency characteristics,
should be connected between terminals 1 and 2
to bypass high-voltage noise and reduce EMI
susceptibility.
+B
0
-B
VCC
BOP
BRP
0
FIRST BOP AFTER
POWER UP
VOUT
VOUT(SAT)
Dwg. WH-006
BOP
0
BRP
VCC
0
VOUT
FIRST BOP AFTER
TRANSIENT(S)
CLASSICAL OUTPUT RESPONSE
VOUT
A3197– OUTPUT RESPONSE
Dwg. WH-007-2A
BOP
0
BRP
VCC
0
VOUT
VOUT
FIRST BOP AFTER
TRANSIENT(S)
CLASSICAL OUTPUT RESPONSE
A3197– OUTPUT RESPONSE
Dwg. WH-007-1A
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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