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STMicroelectronics Electronic Components Datasheet

L497 Datasheet

HALL EFFECT PICKUP IGNITION CONTROLLER

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L497 pdf
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


STMicroelectronics Electronic Components Datasheet

L497 Datasheet

HALL EFFECT PICKUP IGNITION CONTROLLER

No Preview Available !

L497 pdf
L497
ABSOLUTE MAXIMUM RATINGS
Symbol
I3
V3
V6
I16
V16
I7
I15
VR
Tj, Tstg
Ptot
Parameter
D.C. Supply current
Transient Supply Current (tf fall time constant = 100ms)
Supply Voltage
RPM Voltage
D.C. Driver Collector Current
Pulse ”
”(t <= 3ms)
Driver Collector Voltage
Auxiliary Zener Current
D.C. Overvoltage Zener Current
Pulse ”
” t fall = 300µs,
trep Repetition Time > = 3ms
Reverse Battery Voltage if Application Circuit of Fig. 4 is used
Junction and StorageTemperature Range
Power Dissipation
at Taluminia = 90 °C for SO-16
Tamb = 90 °C for DIP-16
Value
200
800
Int. Limited to Vz3
28
300
600
28
40
15
35
– 16
– 55 to 150
1.2
0.65
Unit
mA
mA
V
mA
mA
V
mA
mA
mA
V
°C
W
W
PIN CONNECTION (top view)
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth j-amb Thermal Resistance Junction-ambient for DIP-16
Max
90
°C/W
Rth j-alumin (*) Thermal Resistance Junction-alumina for SO-16
Max
50
°C/W
(* ) Thermal resistance junction-aluminia wi th the device soldered on the mi ddle of an aluminia supporting substrate mesuri ng
15 x 20 ; 0.65 mm thickness.
2/11


Part Number L497
Description HALL EFFECT PICKUP IGNITION CONTROLLER
Maker STMicroelectronics
Total Page 11 Pages
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