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부품번호 | L497D1 기능 |
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기능 | HALL EFFECT PICKUP IGNITION CONTROLLER | ||
제조업체 | STMicroelectronics | ||
로고 | |||
전체 11 페이지수
L497
HALL EFFECT PICKUP IGNITION CONTROLLER
. DIRECT DRIVING OF THE EXTERNAL
POWER DARLINGTON
. COIL CURRENT CHARGING ANGLE (dwell)
CONTROL
. PROGRAMME COIL CURRENT PEAK LIMITA-
TION
. PROGRAMMABLE DWELL RECOVERY TIME
WHEN 94 % NOMINAL CURRENT NOT
REACHED
. RPM OUTPUT
. PERMANENT CONDUCTION PROTECTION
. OVERVOLTAGE PROTECTION FOR EXTER-
NAL DARLINGTON
. INTERNAL SUPPLY ZENER
. REVERSE BATTERY PROTECTION
DESCRIPTION
The L497is an integratedelectronicignition control-
ler for breakerless ignition systemsusing Hall effect
sensors.
DIP16
SO16
ORDERING NUMBERS : L497B (DIP16)
L497D1 (SO16)
The device drives an NPN external darlington to
control the coil current providingthe required stored
energy with low dissipation.
A special feature of the L497 is the programmable
time for the recovery of the correct dwell ratio Td/T
when the coil peak current fails to reach 94 % of the
nominal value. In this way only one spark may have
an energy less than 94 % of the nominal one during
fast acceleration or cold starts.
BLOCK DIAGRAM
March 1998
1/11
L497
PIN FUNCTIONS (continued)
N° Name
Function
14 DRIVER EMITTER Current Driver for the External Darlington. To ensure stability and precision
OUTPUT
of Tdesat Cc and R9 must be used. Recommended value for R9 is 2 KΩ in
order not to change the open loop gain of the system.
Rc may be added to Cc to obtain greater flexibility in various application
situations.
Cc and Rc values ranges are 1 to 100 nF and 5 to 30 KΩ depending on the
external darlington type.
15 OVERVOLTAGE LIMIT The darlington is protected against overvoltage by means of an internal
zener available at this pin and connected to pin 14. The internal divider
R3/R2 defines the limitation value given by :
Vovp
=
22.5
R3
+
5.10−3
R2
+
22.5
16 DRIVER COLLECTOR The collector current of the internal driver which drives the external
INPUT
darlington is supplied through this pin. Then the external resistor R6 limits
the maximum current supplied to the base of the external darlington.
ELECTRICAL CHARACTERISTICS (VS = 14.4 V, – 40 °C < Tj < 125 °C unless otherwise specified)
Symbol
V3
I3
VS
VZ3
V5
I5
V16–14
VSENS
I1 1C
I1 1D
I11C / I11D
ISRC
ISENSE
TSRC
VZ15
TP
Parameter
Test Conditions
Min Op. Voltage
Supply Current
V3 = 6 V
V3 = 4 V
Voltage Supply
Supply Clamping Zener Voltage IZ3 = 70 mA
Input Voltage
Low Status
High Status
Input Current
V5 = LOW
Darlington Driver Sat. Current
Current Limit. Sensing Voltage
I14 = 50 mA
I14 = 180 mA
VS = 6 to 16 V
CW Charge Current
VS = 5.3 to 16V
V11 = 0.5V
T = 10 to 33ms
CW Charge Current
VS = 5.3 to 16V
V11 = 0.5V
T = 10 to 33ms
VS = 5.3 to 16V
V11 = 0.5V
T = 10 to 33ms
See Note 1
Percentage of Output Current
Determining the Slow Recovery
Control Start (fig. 2), note 1
Duration of Altered Small Contr. CSRC = 1 µF
Ratio after SRC Function Start R7 = 62 KΩ
(fig. 2)
External Darlington over V Prot. I15 = 5 mA
Zener Voltage
I15 = 2 mA
Permanent Conduction Time
V5 = High
CP = 1µF
R7 = 62KΩ
Min.
3.5
5
7
6.8
2.5
– 400
260
– 11.0
0.5
7.8
90
19
18
0.4
Typ.
18
7.5
320
– 9.3
0.7
94
0.8
22.5
21.5
1.1
Max.
25
13
28
8.2
0.6
– 50
0.5
0.9
370
– 7.8
1.0
22.0
98.5
26
25
1.8
Unit
V
mA
mA
V
V
V
V
µA
V
V
mV
µA
µA
%
s
V
V
s
4/11
4페이지 Figure 2 : SRC : Icoil Failure and Time Dependence of Active Region.
L497
HJ : Input signal
IC : Coil current
Figure 3 : Permanent Conduction Protection.
VCM : Voltage on capacitor CSRC.
DST : Percentage of imposed desaturation time.
PERMANENT CONDUCTION PROTECTION
(fig. 3)
The permanent conduction protection circuit moni-
tors the input period, chargingCP with a costantcur-
rent when the sensor signal is high and discharging
it when the sensor signal is low. If the input remains
high for a time longer than TP the voltage across CP
reachesan internallyfixed valueforcingthe slow de-
crease of coil current to zero. A slow decrease is
necessary to avoid undesired sparks. When the in-
put signal goes low again CP is swiftly discharged
and the current control loop operates normally.
The delay time TP is given by :
TP (sec) = 18 CP R7
Where R7 is the biasing resistor on pin 12 (in K) and
Cp the delay capacitor at pin 9 (in µF).
7/11
7페이지 | |||
구 성 | 총 11 페이지수 | ||
다운로드 | [ L497D1.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
L497D1 | HALL EFFECT PICKUP IGNITION CONTROLLER | STMicroelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |