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參數(shù)資料
| 型號(hào)： | 3197 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Protected,High-Temperature,Hall-Effect Latch With Active Pull-Down(保護(hù)型，工作于高溫，集電極開路霍爾效應(yīng)鎖存器) |
| 中文描述： | 保護(hù)，高溫，霍爾效應(yīng)與主動(dòng)下拉（保護(hù)型，工作于高溫，集電極開路霍爾效應(yīng)鎖存器鎖存） |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 193K |
| 代理商： | 3197 |
3197
PROTECTED, HIGH-TEMP.,
OPEN-COLLECTOR
HALL-EFFECT LATCH
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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, V
CC(UV)
, (or negative) condition,
or first overvoltage (positive) condition,
V
CC(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
μ
F to 0.5
μ
F capacitor,
with good high-frequency characteristics,
should be connected between terminals 1 and 2
to bypass high-voltage noise and reduce EMI
susceptibility.
B
OP
B
RP
V
CC
V
OUT
FIRST B
OP
AFTER
TRANSIENT(S)
Dwg. WH-007-2A
0
0
V
OUT
CLASSICAL OUTPUT RESPONSE
A3197
–
OUTPUT RESPONSE
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 B
RP
(S-N transition) and then
B
OP
is exceeded, depending on the turn-on
state of the internal latches.
B
OP
B
RP
V
CC
V
OUT
FIRST B
OP
AFTER
POWER UP
Dwg. WH-006
0
0
V
OUT(SAT)
+B
-B
B
OP
B
RP
0
V
CC
V
OUT
FIRST B
OP
AFTER
TRANSIENT(S)
Dwg. WH-007-1A
0
V
OUT
CLASSICAL OUTPUT RESPONSE
A3197
–
OUTPUT RESPONSE
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