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PDF L497 Data sheet ( Hoja de datos )
| Número de pieza | L497 | |
| Descripción | HALL EFFECT PICKUP IGNITION CONTROLLER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L497 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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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
1 page  
ELECTRICAL CHARACTERISTICS (continued)
Symbol
V6SAT
I6 leak
VZ7
V12
Parameter
RPM Output Saturation Voltage
RPM Output Leakage Current
Auxiliary Zener Voltage
Reference Voltage
Test Conditions
I6 = 18.5 mA
I6 = 25 mA
VS = 20 V
I7 = 20 mA
N otes :
1.
td/t desaturation
ratio is
given by:
td
T
=
1
+
1
I11C
⁄
I11D
2. Isense = Icoil when the external Darlington is in the active region.
APPLICATION INFORMATION
Figure 1 : Main Waveforms.
L497
Min.
19
1.20
Typ.
1.25
Max.
0.5
0.8
50
27
1.30
Unit
V
V
µA
V
V
5/11
5 Page 
L497
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously
supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems
without express written approval of SGS-THOMSON Microelectronics.
© 1998 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet L497.PDF ] | |
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