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L482D1 Dataheets PDF



Part Number L482D1
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description HALL.EFFECT PICKUP IGNITION CONTROLLER
Datasheet L482D1 DatasheetL482D1 Datasheet (PDF)

L482 HALL–EFFECT PICKUP IGNITION CONTROLLER . . . . . . . . DIRECT DRIVING OF THE EXTERNAL POWER DARLINGTON COIL CURRENT CHARGING ANGLE (DWELL) CONTROL COIL CURRENT PEAK VALUE LIMITATION CONTINUOUS COIL CURRENT PROTECTION CONDUCTION AND DESATURATION TIME OUTPUT SIGNALS PERMANENT CONDUCTION PROTECTION RESET OUTPUT SIGNAL OVERVOLTAGE PROTECTION FOR EXTERNAL DARLINGTON LOAD DUMP PROTECTION DIP16 DESCRIPTION The L482 is an integrated circuit designed for use with an NPN darlington in breakerless.

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L482 HALL–EFFECT PICKUP IGNITION CONTROLLER . . . . . . . . DIRECT DRIVING OF THE EXTERNAL POWER DARLINGTON COIL CURRENT CHARGING ANGLE (DWELL) CONTROL COIL CURRENT PEAK VALUE LIMITATION CONTINUOUS COIL CURRENT PROTECTION CONDUCTION AND DESATURATION TIME OUTPUT SIGNALS PERMANENT CONDUCTION PROTECTION RESET OUTPUT SIGNAL OVERVOLTAGE PROTECTION FOR EXTERNAL DARLINGTON LOAD DUMP PROTECTION DIP16 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 supply. The comparison between VC2 and VC5 voltages determines the timing for the dwell control. The recommended value is 100nF using a 100KΩ resistor at pin 7. For the optimized operation of the device, C2 = C5. The capacitor C5 connected between this pin and ground is charged when the Hall-effect output is high and is discharged at the High to Low transition of the Hall-effect signal. The recommended value is 100nF using a 100KΩ resistor at pin 7. This pin can be used to project the Hall-effect pickup against the voltage transients, The resistor R a limits the current into the internal zener. Open Collector Output Signal. This output is high when the external darlington is in desaturation condition (current limitation), see td pulse in fig. 1. A resistor R11 connected between this pin and ground sets the internal current used to drive the external capacitors of the dwell control (C2 and C 5) and permanent conduction protection (C 1). The recommended value is 100KΩ. A capacitor C1 connected between this pin and ground determines the intervention delay of the permanent conduction protection, tpc of the figure 2. With a 1 µF capacitor and 100KΩ resistor R11 at pin 7 the typical delay is 1s. A low pulse on this output detects the intervention of the permanent conduction protection, as shown in figure 2. Typically the duration of the time tr is more than 100µs. Connection for Coil Current Limitation. The current is measured on the sense resistor R S and divided on R1/R2. The current limitation value is given by : R1 + R2 ISENS = VSENS RS ⋅ R2 The device is protected against the load dump. In load dump condition an internal circuit, based on a zener diode and a darlington transistor, switches off the external darlington and short circuits the supply. By means of the external divider R8/R9 the protection threshold can be changed and is given as first approximation by: VDth = 8.5 ⋅  3 DWELL CONTROL 4 DWELL CONTROL TIMER 5 6 HALL SENSOR SUPPLY DESATURATION TIME SIGNAL REFERENCE VOLTAGE 7 8 PERMANENT CONDUCT. PROTECTION TIMER PERMANENT CONDUCT. RESET OUTPUT (no available in Micropackage) (*) CURRENT SENSING INPUT (*) 9 10 11 DUMP PROTECTION (*)  R8 + R9   R9 −4  + 5 ⋅ 10 ⋅ R8  (the resistor R9 value must be higher than 4KΩ). 12 POWER SUPPLY (*) Supply Voltage Input. A 7V (typ) zener is present at the input. The external resistor R7 limits the current through the Zener for high supply voltages. 3/11 L482 PIN FUNCTIONS (continued) N° 13 14 Name GROUND DRIVER COLLECTOR Function This pin must be connected to ground. The collector current for the .


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