L482D1 Datasheet | STMicroelectronics

DESCRIPTION The L482 is an integrated circuit designed for use with an NPN darlington in breakerless ignition systems with hall-effect pickup sensors and high energy ignition coils. It controls the energy stored in the ignition coil and the desaturation time of the external darlington to limit the power dissipation. PIN CONNECTIONS (top views) SO16 ORDERING NUMBERS : L482 (DIP16) L482D1 (SO16) The L482 is also particularly suitable for use as ignition control and driving stage in more sophisticated car electronic systems which employ microprocessor circuits. DIP16 SO16 November 1991 1/11 L482 ABSOLUTE MAXIMUM RATINGS Symbol VR VD Ptot Tj, Tstg Reverse Battery Voltage Dump Voltage Power Dissipation at Tamb = 90°C Junction and Storage Temperature Range SO16 DIP Parameter Value - 14 100 1.2 0.65 - 55 to 150 Unit V V W W °C BLOCK DIAGRAM THERMAL DATA Symbol Rth j-amb R th j-al Parameter Thermal Resistance Junction-ambient ( DIP16) Thermal Resistance Junction-alumina ( SO16 ) Max Max Value 90 50 Unit °C/W °C/W (- ) Thermal resistance junction-aluminia with the device soldered on the middle of an aluminia supporting substrate measuring 15 x 20mm ; 0.65mm thickness with infinite heatsink. 2/11 L482 PIN FUNCTIONS (refer to fig. 3 for DIP16 package) N° 1 2 Name CONDUCTION TIME SIGNAL HALL-EFFECT INPUT Function A low level on this output signal indicates when the external darlington is in the ON condition i.e. when the current flows through the coil (ton in fig.1) Hall-effect Pickup Input. A high level on this pin enables the current driving into the coil. The effective coil charge will be a function of the dwell control logic. A High to Low transition from the Hall-effect pickup is the signal for ignition actuation. The input signal, supplied by the open collector output stage of the Hall-effect sensor, has a duty cycle typically about 70%. The average voltage on the capacitor C2 connected between this pin and ground depends on the motor speed and the voltage...