UNISONIC TECHNOLOGIES CO., LTD UL497 Preliminary LINEAR INTEGRATED CIRCUIT HALL EFFECT PICKUP IGNITION CONTROLLER DESCRIPTION As an integrated electronic ignition controller for breakerless ignition systems which uses Hall effect sensors, the UTC UL497 drives an NPN external darlington to control the coil current providing the required stored energy with low dissipation. One of the UTC UL497 special features is the programmable time for the recovery of the correct dwell ratio Td/T while the coil peak current fails to reach 94 % of the nominal value. FEATURES * Direct driving of the external power darlington * Coil current charent charging angle control * Programme coil current peak limitation * When 94% nominal current not reached programmable dwell recovery time * RPM output * Has peranent conduction protection * Overvoltage protection * Internal supply zener * Reverse battery protection ORDERING INFORMATION Ordering Number Lead Free UL497L-S16-R UL497L-S16-T Halogen Free UL497G-S16-R UL497G-S16-T www.unisonic.com.tw Copyright © 2013 Unisonic Technologies Co., Ltd Package Packing SOP-16 SOP-16 Tape Reel Tube 1 of 8 QW-R118-015.a UL497 Preliminary PIN CONFIGURATION PIN DESCRIPTION (refer to APPLICATION CIRCUIT) PIN NO. 1 2 PIN NAME GND SIGNAL GND 3 POWER SUPPLY 4 N.C. 5 HALL-EFFECT INPUT 6 RPM OUTPUT 7 AUX. ZENER 8 RECOVERY TIME 9 MAX CONDUCTION TIME 10 DWELL CONTROL TIMER DESCRIPTION This pin must be connected to ground. This pin must be connected to ground. The input of supply voltage. Its voltage will be limited by an 7.5V zener. The R5 inside will limit the current by the zener for high supply voltege. Connected to ground or left open. The input of the hall-effect pickup signal. This input is dwell control circuit output to enable the current driving into the coil. As a open collector output, it’s at low level when current flows in the ignition coil. It should be connected pin7 zener for high volteges protection. Then R8 must limit the zener current, too, and R 1 limits pin 6 current if RPM module pad is accidentally connected to VS. A 21V Zener whose current must be limited by an internal resistor. A capacitor connected between this pin and ground sets the slope of the dwell time variation as it rises from zero to the correct value. It occurs just following the detection of I coll≤94% I nom, only before the low transition of the hall-effect signal pulse. The duration is given : tsrc=12.9×R7src× Csrc (ms) PS: R7 (KΩ) is the biasing resistor at pin 12 and Csrc (μF) is the delay capacitor at pin 8. Between this pin and ground there’s a capacitor which determines the intervention delay of the permanent conduction protection. The coil current is slowly reduced to zero after the delay time. Delay Time TP is given by : tP=16×R7 CP (ms) PS: R7 (KΩ) is the biasing resistor at pin 12 and CP (μF) is the delay capacitor at pin 9. Connected between this pin and ground there’s a capacitor CT which is charged when the Hall effect output is High and is discharged at the High to Low transition of the Hall effect signal. When using a 62KΩ resistor at pin12 CT should be 100nF. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw LINEAR INTEGRATED CIRCUIT 2 of 8 QW-R118-015.a UL497 Preliminary LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION (Cont.) PIN NO. PIN NAME 11 DWELL CONTROL 12 BIAS CURRENT 13 CURRENT SENSING 14 DRIVER EMITTER OUTPUT 15 OVER VOLTAGE LIMIT 16 DRIVER COLLECTOR INPUT DESCRIPTION The average voltage on the capacitor CW connected between this pin and ground depends on the motor speed and the voltage supply. The comparison between V CW and V CT voltage determines the timing for the dwell control. The internal current which used to drive the external capacitors of the dwell control(pin10 and11)permanent conduction protection (pin 9) and slow recovery time (pin 8) can be set by a resistor(recommended 62KΩ) connected between this pin and ground. Connection for the Coil Current Limitation. The current limitation value is given by : Isens=0.32×(R10+R11)÷(RS×R11) RS: sensing resistor Current Driver for the External Darlington. The internal divider R3/R2 defines the limitation value given by: VOVP=(22.5/R3+5×10-3)×R2+22.5 Through this pin The collector current of the internal driver which drives the external limits darlington is supplied. Then the external resistor R6 the maximum current supplied to the base of the external darlington. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R118-015.a UL497 Preliminary LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM POWER SUPPLY RPM OUTPUT 3 6 DRIVER COLLECTION INPUT 16 OVER VOLTAGE PROTECTION RPM BIAS CURRENT 12 HALL EFFECT INPUT 5 DWELL CONTROL 10 DWELL CONTROL 11 15 OVER VOLTAGE LIMIT 14 DRIVER EMITTER OUTPUT 13 CURRENT SENSING REFERENCE DWELL CONTROL CONTROL SWITCH DRIVING STAGE DESATURATION SENSOR CURRENT LIMITER RECOVER TIME 8 SLOW RECOVERY CIRCUIT PERMANENT CONDUCTION PROTECTION AUX ZENER 4 N.C. 7 9 MAX TIME UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1 GND 2 SINGLE GND 4 of 8 QW-R118-015.a UL497 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT D.C. Supply Current 200 mA I3 Transient Supply Current tf fall time constant=100ms 800 mA Supply Voltage V3 Internal Limited to Vz3 RPM Voltage V6 28 V D.C. Driver Collector Current 300 mA I16 Pulse (t ≤ 3ms) 600 mA Driver Collector Voltage V16 28 V Auxiliary Zener Current I7 40 mA Pulse tfall=300μs 15 mA D.C. Overvoltage Zener I15 Current trep Repetition Time≥3ms 35 mA Reverse Battery Voltage if Application Circuit VR -16 V Power Dissipation TC=90°C PD 1.2 W Junction Temperature TJ -55~150 °C Storage Temperature TSTG -55~150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient (Note) θJA 50 (MAX) °C/W Note: Thermal resistance junction Ambient with the device soldered on the middle of an Ambient supporting substrate measuring 15x20; 0.65mm thickness. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 8 QW-R118-015.a UL497 Preliminary LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (VS=14.4V, -40 °C<TJ<125°C, unless otherwise specified) PARAMETER Min Operating Voltage Supply Current SYMBOL V3 I3 Voltage Supply Supply Clamping Zener Voltage VS VZ3 Input Voltage V5 Input Current I5 Darlington Driver Saturation Current V16–14 Current Limit Sensing Voltage VSENSE CW Charge Current I11C CW Charge Current I11D CW Charge Discharge ratio Percentage of Output Current Determining the Slow Recovery Control Start (Note 2) Duration of Altered Small Control Ratio after SRC Function Start External Darlington over V Prot Zener Voltage Permanent Conduction Time RPM Output Saturation Voltage I11C/I11D TEST CONDITIONS V3=6V V3=4V IZ3=70mA Low Status High Status V5=LOW I14=50mA I14=180mA VS=6~16V VS=5.3~16V,V11=0.5V, T=10~33ms VS=5.3~16V, V11=0.5V, T=10~33ms VS= 5.3~16V, V11=0.5V, T=10~33ms (Note 1) ISRC/ISENSE TSRC VZ15 TP V6SAT TYP MAX 18 6.8 7.5 25 13 28 8.2 0.6 2.5 -400 260 320 -11.0 -9.3 -7.8 μA 0.5 0.7 1.0 μA 7.8 CSRC=1μF, R7=62KΩ I15=5mA I15=2mA V5=High, CP=1μF, R7=62KΩ I6=18.5mA I6=25mA VS=20V I7=20mA UNISONIC TECHNOLOGIES CO., LTD UNIT V mA mA V V V V μA V V mV -50 0.5 0.9 370 90 RPM Output Leakage Current I6 LEAK Auxiliary Zener Voltage VZ7 Reference Voltage V12 Notes: 1. td/t desaturation ratio is given by: td/T=1/[1+I11C/I11D] 2. ISENSE=Icoil when the external Darlington is in the active region. www.unisonic.com.tw MIN 3.5 5 7 22.0 94 98.5 0.8 19 18 0.4 22.5 21.5 1.1 19 1.20 1.25 % s 26 25 1.8 0.5 0.8 50 27 1.30 V s V V μA V V 6 of 8 QW-R118-015.a UL497 Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION Fig 1. MAIN WAVEFORM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R118-015.a UL497 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT RPM R4 VS+ H+ CS 0.22µF DZI 24V 20Ω R1 100Ω R8 820Ω R6 56Ω R5 100Ω T1 4.3KΩ 6 HALL EFFECT SENSOR 16 3 15 5 Q1 7 IBIAS R7 62KΩ R2 5KΩ R3 350Ω UTC UL497 4 24V DZZ 14 12 10 CT 0.1µF 11 1 CW 0.1µF 8 CSRC 1µF 2 9 CP 1µF R9 2KΩ 13 BU931R RC 10KΩ CC 2.2nF CO R10 200Ω R11 100Ω VSENS RO RS 75mΩ GND Fig 2. APPLICATION CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 8 QW-R118-015.a