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參數(shù)資料
| 型號(hào)： | L484D1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MAGNETIC PICKUP IGNITION CONTROLLER |
| 中文描述： | 磁皮卡點(diǎn)火控制器 |
| 文件頁(yè)數(shù)： | 5/11頁(yè) |
| 文件大?。?/td> | 156K |
| 代理商： | L484D1 |
DUMPPROTECTION
Symbol
V
DZ
Paramater
Test Conditions
I
pin12
= 2mA
Min.
7.5
Typ.
Max.
9.5
Unit
V
Zener Dump (pin 12)
(*) Note 1 : TD/T is given by the formula :
TD
=
T
1
1 +I7D/I7C
(**) Note 2 :
TD
K
=
T
1 +I7D/I7C
K valuedepends on the pick–up used in the application ; typically K = 0.1
(***) Note 3 : the permanent conduction protection is guaranteed over the full temperature range
CIRCUIT OPERATION
The L484 controls the charging angle (dwell) and
thepeakvalue of theprimary currentinthecoilover
thefull range of operating conditions.
The coil current is limited to a predeterminedlevel
by meansof a negativefeedbackcircuit includinga
current sensing resistor, a comparator, the driver
stageand the power switch.
Thedwellcontrolcircuit keepstheoutputstageinits
activeregionduringcurrent limitation. The time the
outputstageis operatingintheactive region(desa-
turationtime), is sufficient to compensatefor possi-
ble variation in the energy stored due to the
accelerationof the motor ; moreoverthis time is li-
mitedto avoid excessive power dissipation.
MAGNETICPICK–UP CHARACTERISTICS
The typical magneticpickupwaveforms are shown
in fig. 1, theamplitude ofthesignalbeinga function
of the frequency.However on themarket thereare
many typesof magneticpickup, of whichthe wave-
forms may differ very much. Adjusting the value of
theresistor R
11
on pin2 and/oraddingaresistor R
a
between the pin 6 (dwell adjust) and pin 11, as
shownintheapplicationcircuit,itispossibletoadapt
theL484 to a wide rangeof magneticpickup wave-
forms.
Particularlyby means of the resistorR
11
onpin 2 it
is possible to define the maximum advanceof the
conductionstart into the coil . Thisis veryuseful at
highpick–up frequency.
CONTROL OFTHE DWELL ANGLE
The dwell angle control circuit defines the conduc-
tion timeof the outputdarlington,versus thespeed
of rotation, the supply voltage and the charac-
teristicsof thecoil.
In eachcycle the time thetransistor operatesin the
activeregionis comparedwith areferencetimeand
the error signal amplified to advanceor delay the
conductionin the next cycle. To limit thepower dis-
sipation the desaturation time is typically fixed
to 10%of the period T.
Atvery low frequenciestheON thersholdis fixedat
200mVoftheinputsignalandthe desaturationtime
is mainly determined by the peak waveform. This
positivethresholdalsopreventspermanentconduc-
tion when the motor is stopped.Whenthe input fre-
quency increases the dwell control gradually sets
thedesaturationtimeto10%of theperiod.Athigher
frequenciesthe ON thresholdbecomesnegativeto
permitaconductionangleof more than50%always
keepingdesaturationtime to 10%of the period.
CURRENT LIMITING
The current in the coil is measured by means of a
voltagedropacrossasuitableresistor intheemitter
lead of the power transistor. When the threshold
voltage (260mV typ) is reached, the coil current is
kept constant viaa feedbackloop.
L484
5/11
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