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參數(shù)資料
| 型號： | L482D1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CAP 10UF 10V +80-20% Y5V SMD-1206 TR-7-PL SN100 |
| 中文描述： | HALL.EFFECT皮卡點火控制器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 169K |
| 代理商： | L482D1 |
DESATURATIONTIMES INLOWAND HIGHFRE-
QUENCYOPERATION.Due totheupperlimitofthe
voltagerange of pin 3, if thecomponentsof fig.3, 4
areused,below 10Hz (300RPMfora4 cylinder en-
gine) the OFF time reaches its maximum value
(about50ms)andthenthecircuitgraduallylosesthe
control of the dwellanglebecauseD = T – 50ms
Over200Hz(6000RPM fora 4cylinder engine)the
availabletime for theconductionislessthan3.5ms.
If theusedcoil is 6mH, 6A,the OFF time isreduced
to zero and thecircuit losesthe dwell anglecontrol.
TRANSIENT RESPONSE. The ignition system
must deliver constant energy evenduring the con-
dition of accelerationand decelerationof the motor
below 80Hz/s. These conditions can be simulated
by means of a signal generator with a linearly mo-
dulated frequency between 1Hz and 200Hz (this
correspondstoachangebetween30and6000RPM
for a 4 cylindersengine.
CURRENT LIMIT. The current in thecoil is monito-
red by measuring the I
sense
current flowing in the
sensingresistorR
s
ontheemitteroftheexternaldar-
lington.I
sense
is givenby :
I
sense
= I
coil
+ I
16
When the voltagedropacrossR
s
reachesthe inter-
nalcomparatorthresholdvaluethe feedbackloopis
activatedand I
sense
keptconstant(fig. 1)forcingthe
externaldarlingtonin theactive region. In this con-
dition :
I
sense
= I
coil
WhenaprecisepeakcoilcurrentisrequiredR
5
must
be trimmed or an auxiliary resistor divider (R
1
, R
2
)
added:
V
SENS
Icpeak(A)
=
(
R
S
R
1
R
2
+ 1)
PROTECTION CIRCUIT
PERMANENTCONDUCTION PROTECTION
The batteryvoltageis applied to ignitionmoduleby
meansof the ignition key. In theseconditions, with
the motor stopped, it is necessary that there is no
permanent conductionin the ignition coil irrespecti-
ve of the polarity of the input signal.
The L482incorporatesatiming circuit to implement
thisprotection; thedurationoftheinterventionisset
by means of a capacitor C
1
at pin 8 = 1
μ
F, and
R
11
=100k
, whenthe input signalis highfor more
than1 s,the coil current gradually decreasesdown
to zero to avoid spurious sparks (see fig. 2).
This timing allows normal operation of the module
above30RPM.
DARLINGTONOVERVOLTAGELIMITATION
The darlington is protectedagainst overvoltageby
meansof an externaldividerR
5
/R
6
(pin15) and an
internalzener.This zener drives theexternaldarlin-
gtonin order to limit thecollector voltage.
REVERSEBATTERY PRTOTECTION. Due to the
presenceofexternalimpedanceatpin5, 10,11,14,
15, L482 is protected against reverse battery volt-
age.
DUMP PROTECTION.
The load dump protection withstands up to 100V
with a decaytime
≤
300ms. The intervention thre-
sholdforloaddumpisfixedbymeansofanexternal
sion) or to pin10 using a Micropackage type.
NEGATIVESPIKEPROTECTION.If correctopera-
tionis requestedalso duringshort negativespikes,
thediode DS and capacitorC
s
mustbe used.
USE OF THE IC ELECTRONIC ADVANCE SY-
STEM
When the device is digitally controlled the control
unit transmits a suitable input signal to the power
module, receivingin turninformationthat allows the
controlof thedwell and the on time of the finaltran-
sistor.
ForthisreasonL482providesthefollowingoutputs:
.
a time signal equal to the time in whichthe final
Darlingtonisintheactiveregioni.e.whenthecoil
current islimited (V
ds
) as shown in figure1. This
signal must be TTL compatible.
.
a TTL compatible output from the timing circuit
(V
rs
in figure2). Thispulse,availableonly using
the DIP-16 packageversion is present after the
protectionagainstcranking transients.
.
a time signal equal to the time in whichthe final
Darlington,is in”on” condition(V
on
) i.e.whenthe
current flows throughthe coil, see fig. 1.
OTHER APPLICATIONINFORMATION
Ifthesupplyvoltageis disconnected-or thebattery
wire is broken- whilethe currentis flowing through
thecoil, the externaldiodeD
1
keepsthe coil current
from recirculating into the device : in this way both
deviceanddarlington are protected.
L482
8/11
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相關(guān)代理商/技術(shù)參數(shù) |
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| L482D1013TR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Hall Effect Control RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L483 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THYRISTOR MODULE|SCR DOUBLER|280V V(RRM)|22A I(T) |
| L-483 | 制造商:KINGBRIGHT 制造商全稱:Kingbright Corporation 功能描述:T-1 (3mm) CYLINDRICAL LED LAMPS |
| L-483E | 制造商:KINGBRIGHT 制造商全稱:Kingbright Corporation 功能描述:T-1 (3mm) CYLINDRICAL LED LAMPS |
| L-483ED | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.0x5.0x10.0mm RECTANGULAR LED LAMP |
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