|
STMicroelectronics |
L484
MAGNETIC PICKUP IGNITION CONTROLLER
. DIRECT DRIVING OF THE EXTERNAL DAR-
LINGTON
. OPERATES WITH A WIDE RANGE OF MA-
GNETIC PICKUP TYPES
. CHARGING ANGLE (DWELL) CONTROL
. COIL CURRENT PEAK LIMITATION
. CONTINUOUS COIL CURRENT PROTECTION
. TACHOMETER SIGNAL OUTPUT
. EXTERNAL DARLINGTON OVERVOLTAGE
PROTECTION
. LOAD DUMP AND REVERSE BATTERY PRO-
TECTION
. POSSIBILITY OF SPARK POINT DELAYING
(ANTI KNOCK SYSTEM)
special design which has two input pins from the pic-
kup ; the first is the zero crossing detector for the
ignition command and the second pin is used to cal-
culate the dwell time. Moreover another pin is used
to adapt the L484 to various pickup types.
Other features of the device include darlington over-
voltage protection, dump protection, a supply volt-
age range of 6-28 V.
DESCRIPTION
The L484 is an integrated circuit designed for use
with an NPN darlington in breakerless ignition sy-
stems with magnetic pickup sensors and high ener-
gy ignition coils.
A key feature of the L484 is flexibility. It can be used
with a wide variety of magneticsensors thanks to the
BLOCK DIAGRAM
DIP16
SO16
ORDERING NUMBERS : L484 (DIP16)
L484D1 (SO16)
November 1991
1/11
L484
ABSOLUTE MAXIMUM RATINGS
Symbol
VR
VD
Pto t
Tj, Tstg
Parameter
Reverse Battery Voltage
Dump Voltage
Power Dissipation at Tamb = 90°C
Junction and Storage Temperature Range
PIN CONNECTION
Value
– 14
100
0.75
– 55 to 150
Unit
V
V
W
°C
THERMAL DATA
Symbol
Rth j-amb
Rth j-al
Parameter
Thermal Resistance Junction-ambient (DIP16)
Thermal Resistance Junction-alumina (SO16)
Value
Unit
Max 80 °C/W
Max 50 °C/W
2/11
|