UNISONIC TECHNOLOGIES CO., LTD 93334 LINEAR INTEGRATED CIRCUIT HIGH ENERGY IGNITION CIRCUIT DESCRIPTION This device is designed to use the signal from a reluctor type ignition pickup to produce a well controlled output from a power darlington output transistor. SOP-8 FEATURES * Very Low Peripheral Component Count * No Critical System Resistors * Wide Supply Voltage Operating Range (4.0V ~ 24V) * Overvoltage Shutdown (30V) * Dwell Automatically Adjusts to Produce Optimum Stored Energy without Waste * Externally Adjustable Peak Current * Transient Protected Inputs and Outputs *Pb-free plating product number: 93334L ORDERING INFORMATION Order Number Normal Lead Free Plating 93334-S08-R 93334L-S08-R 93334-S08-T 93334L-S08-T Package Packing SOP-8 SOP-8 Tape Reel Tube 93334L-S08-R (1)Packing Type (1) R: Tape Reel, T: Tube (2)Package Type (2) S08: SOP-8 (3)Lead Plating (3) L: Lead Free Plating, Blank: Pb/Sn www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 5 QW-R121-006,A 93334 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION POWER GND 1 8 IL SENS GND 2 7 OUT UTC 93334 C 3 6 VCC S1 4 5 S2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R121-006,A 93334 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM AND TYPICAL APPLICATION Figure 1 RBAT 300 CFilter 0.2 R1 20k Reluctor Pickup 1.35H C1* 470 5 R 12k + - S1 R2 20k C2* 0.01 S2 Input Comparator with Hysteresis RDRIVE 100 Power Output &OVP 4 C 3 Ignition Coil Primary 8.0mH RGAIN 5.0k + - Dwell Reference Buffer CDWELL 0.1 Current Limit Sense RD2 100 UTC 93334 2 **BU941 RD1 35-350 RS 0.075 1 * Optional parts for extended transient protection Power Ground ** A350V zener clamp is required when using the standard BU941 This clamp is not required if a selected version with VCEO(SUS) = 550V is used Component Values Pickup Coil RL RA, RB C1, C2 RBAT CFilter CDWELL RGAIN RD2 RS RDRIVE RD1 Series resistance = 800Ω±10% @ 25℃, inductance= 1.35H @ 1.0kHz @ 15Vrms Leakage L=0.6mH, primary R=0.43Ω±5% @ 25℃, primary L=7.5mH ~ 8.5mH @ 5.0A Load resistor for pickup=10Ω±20% Input buffer resistors provide additional transient protection to the already clamped inputs=20k±20% For reduction of high frequency noise and spark transients induced in pick-up and leads; optional and non-critical Provides load dump protection (but small enough to allow operation at VBAT =4.0V) =300Ω±20% Transient filter on VCC, non-critical Stores reference, circuit designed for 0.1µF±20% RGAIN/RD1 sets the DC gain of the current regulator =5.0k±20% RD2/RD1 set up voltage feedback from RS Sense resistor (PDAG in thick film techniques) =0.075Ω±30% Low enough to supply drive to the output Darlington, high enough to keep VCE(SAT) of the IC below Darlington turn-on during load dump = 100Ω±20%, 5.0W Starting with 35Ω assures less than 5.5A, increasing as required to set 5.5A RD1=(IO(PEAK) RS – VREF)/((VREF/RD2)-(1.4/RGAIN))-(≈100Ω) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R121-006,A 93334 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATING UNIT 24 Power Supply Voltage-Steady State Transient 300ms or less VCC V 90 300 mA Output Sink Current-Steady State Transient 300ms of less IOUT(SINK) 1.0 A Power Dissipation 1.05 W PD Derate above 25°C 12 mW/°C Junction Temperature TJ +125 °C Operating Temperature TOPR -20~+85 °C Storage Temperature TSTG -40 ~ 150 °C Note 1. 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. 2. The device is guaranteed to meet performance specification within 0℃~+70℃ operating temperature range and assured by design from -20℃~+85℃. ELECTRICAL CHARACTERISTICS (VCC = 13.2VDC, circuit of Figure 3, unless otherwise specified) PARAMETER Internal Supply Voltage, Pin 6 SYMBOL TEST CONDITIONS VBAT =4.0VDC VBAT =8.0VDC VCC VBAT =12.0VDC MIN VBAT =14.0VDC Ignition Coil Current Peak, Cranking RPM 2.0Hz ~ 27Hz IPEAK Ignition Coil Current Peak, Normal RPM IPEAK Ignition Coil On-Time, Normal RPM Range TON Shutdown Voltage VBAT Input Threshold (Static Test) VTHR Input Threshold Hysteresis VHYS Input Threshold (Active Operation) VTHR VBAT =4.0VDC VBAT =6.0VDC VBAT =8.0VDC VBAT =10.0VDC F=33Hz F=133Hz F=200Hz F=267Hz F=333Hz F=33Hz F=133Hz F=200Hz F=267Hz F=333Hz Current Limit Reference, Pin 8 25 Turn-on Turn-off www.unisonic.com.tw 3.4 5.2 5.3 5.4 5.5 5.5 5.4 4.4 3.4 7.5 5.0 4.0 3.0 2.3 30 360 90 VBAT =10VDC VCE(SAT) VBAT =30VDC VBAT =50VDC VREF UNIT VDC APEAK APEAK 14.0 5.9 4.6 3.6 2.8 35 VDC mVDC 1.8 1.5 120 ms mVDC 75 Turn-on Turn-off 60 UNISONIC TECHNOLOGIES CO., LTD MAX 11.8 3.0 4.0 4.6 5.1 5.1 5.1 4.2 3.4 2.7 Total Circuit Lag from ts (Figure 1) until Ignition Coil Current Falls to 10% Ignition Coil Current Fall Time (90% ~ 10%) Saturation Voltage IC Output (Pin 7) (RDRIVE = 100Ω) TYP 3.5 7.2 10.4 4.0 120 280 540 160 VDC 120 µs µs mVDC 190 mVDC 4 of 5 QW-R121-006,A 93334 LINEAR INTEGRATED CIRCUIT LGNITION COIL CURRENT VERSUS FREQUENCY / PERIOD IOUT (A) 6.0 5.5 5.0 VBAT =13.2VDC Slope= VBAT -1.5V 8.0mH 4.0 3.0 2.0 1.0 333 200 133 5 100 70 10 50 15 20 33 25 30 ms Frequency, f (Hz) 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 5 of 5 QW-R121-006,A