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L497

Features: ·DIRECT DRIVING OF THE EXTERNAL.POWER DARLINGTON ·COIL CURRENT CHARGING ANGLE (dwell)CONTROL ·PROGRAMMECOILCURRENT PEAKLIMITA.TION ·PROGRAMMABLE DWELL RECOVERY TIME·WHEN 94 % NOMINAL CURRENT NOT·REACHED RPMOUTPUT ·PERMANENT CONDUCTION PROTECTION ·OVERVOLTAGE PROTECTION FOR EXTER.·NAL DAR...

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SeekIC No. : 004389174 Detail

L497: Features: ·DIRECT DRIVING OF THE EXTERNAL.POWER DARLINGTON ·COIL CURRENT CHARGING ANGLE (dwell)CONTROL ·PROGRAMMECOILCURRENT PEAKLIMITA.TION ·PROGRAMMABLE DWELL RECOVERY TIME·WHEN 94 % NOMINAL CURRE...

L497 Data Sheet

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Part Number:
L497
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

·DIRECT DRIVING OF THE EXTERNAL.POWER DARLINGTON
·COIL CURRENT CHARGING ANGLE (dwell)CONTROL
·PROGRAMMECOILCURRENT PEAKLIMITA.TION
·PROGRAMMABLE DWELL RECOVERY TIME
·WHEN 94 % NOMINAL CURRENT NOT
·REACHED RPMOUTPUT
·PERMANENT CONDUCTION PROTECTION
·OVERVOLTAGE PROTECTION FOR EXTER.
·NAL DARLINGTON .
·INTERNALSUPPLY ZENER
·REVERSEBATTERY PROTECTION


Pinout

Connection Diagram


Specifications

Symbol
Parameter
Value
Unit
I3
 D.C. Supply current
Transient Supply Current (tf fall time constant = 100ms)
200
800
mA
mA
V3
 Supply Voltage
Int. Limited to Vz3
V6
 RPM Voltage
28
V
I6
 D.C. Driver Collector Current
Pulse " "(t <= 3ms)
300
600
mA
mA
V16
 Driver Collector Voltage
28
V
I7
 Auxiliary Zener Current
40
mA
I15
 D.C. Overvoltage Zener Current
Pulse " " tfall = 300s,
trep Repetition Time > = 3ms
15
35
mA
mA
VR
 Reverse Battery Voltage if Application Circuit of Fig. 4 is used
-16
V
Tj,Tstg
 Junction and StorageTemperature Range
-55to150
°C
Ptot
 Power Dissipation
at Taluminia = 90 °C for SO-16
Tamb = 90 °C for DIP-16
1.2
0.65
W



Description

The L497is anintegratedelectronicignitioncontroller for breakerless ignition systemsusing Hall effect sensors.

The device drives an NPN external darlington to controlthe coil current providingthe requiredstored 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 peakcurrent fails to reach 94%of the nominal value. In this wayonly one sparkmayhave an energyless than 94% of the nominalone during fast accelerationor cold starts




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