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參數(shù)資料
| 型號： | L497D1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HALL EFFECT PICKUP IGNITION CONTROLLER |
| 中文描述： | 霍爾效應(yīng)皮卡點火控制器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 106K |
| 代理商： | L497D1 |
Figure2 :
SRC: I
coil
Failureand Time Dependenceof ActiveRegion.
Figure3 :
PermanentConductionProtection.
H
J
: Inputsignal
I
C
: Coil current
V
CM
: Voltage on capacitor C
SRC.
D
ST
: Percentageof imposeddesaturation time.
PERMANENT CONDUCTION PROTECTION
(fig.3)
The permanent conductionprotectioncircuit moni-
torstheinputperiod,chargingCPwithacostantcur-
rentwhenthe sensorsignalishighanddischarging
it whenthesensorsignalis low.Iftheinputremains
highfora timelongerthanT
P
thevoltageacrossC
P
reachesaninternallyfixedvalueforcingtheslowde-
crease of coil current to zero. A slow decrease is
necessaryto avoidundesiredsparks.When the in-
put signal goes low again C
P
is swiftly discharged
and the current control loop operatesnormally.
The delaytime T
P
is givenby :
T
P
(sec) = 18 C
P
R
7
WhereR
7
isthebiasingresistoron pin12 (inK)and
Cp the delaycapacitor at pin9 (in
μ
F).
L497
7/11
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