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參數資料
| 型號： | L497B |
| 廠商： | 意法半導體 |
| 英文描述： | HALL EFFECT PICKUP IGNITION CONTROLLER |
| 中文描述： | 霍爾效應皮卡點火控制器 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 106K |
| 代理商： | L497B |
L497
March1998
HALLEFFECT PICKUP IGNITION CONTROLLER
COIL CURRENT CHARGING ANGLE (dwell)
CONTROL
.
PROGRAMMECOILCURRENT PEAKLIMITA-
TION
.
PROGRAMMABLE DWELL RECOVERY TIME
WHEN 94 % NOMINAL CURRENT NOT
REACHED
.
RPM OUTPUT
.
PERMANENT CONDUCTION PROTECTION
.
OVERVOLTAGE PROTECTION FOR EXTER-
NAL DARLINGTON
.
INTERNALSUPPLYZENER
.
REVERSEBATTERY PROTECTION
.
DIRECT
POWER DARLINGTON
DRIVING
OF
THE
EXTERNAL
DESCRIPTION
TheL497is anintegratedelectronicignitioncontrol-
ler forbreakerlessignitionsystemsusingHall effect
sensors.
ORDERING NUMBERS :
L497B(DIP16)
L497D1(SO16)
DIP16
SO16
The device drives an NPN external darlington to
controlthecoilcurrentprovidingthe requiredstored
energywith low dissipation.
A specialfeatureof the L497 is the programmable
time for the recovery of the correctdwell ratio T
d
/T
whenthecoilpeakcurrent failstoreach94 %ofthe
nominalvalue.In thiswayonlyonesparkmayhave
an energylessthan94% ofthenominaloneduring
fast accelerationor coldstarts.
BLOCK DIAGRAM
1/11
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