ICC03-400B2 Application Specific Discretes A.S.D.TM IGNITION CONTROL CIRCUIT FEATURES AND BENEFITS MONOLITHIC CIRCUIT FOR CAPACITANCE DISCHARGE SYSTEM CONTROL. DEDICATED THYRISTOR STRUCTURE FOR IGNITION OPERATION. APPLICATIONSPECIFIC DISCRETES (ASD). SURFACE AREA REDUCTION. DIL8 PACKAGE. DIL8 (Plastic) DESCRIPTION The ICC03 is a high-performance planar-diffused technology adapted to rugged environment conditions. It has been developed especially for small engines using a capacitor discharge technique for ignition operation. The ICC03 assumes electronics control of the ignition system. - Pin 1 : Motor stop - Pin 3 : Ground - Pin 4 : Sensor - Pin 6/7 : Ignition capacitor - Pin 8 : Charging, winding - Pin 2/5 : Not connected FUNCTIONAL DIAGRAM TOP VIEW 08 01 D2 D1 02 07 03 06 TH 04 05 See basic application and functionality page 4. September 1998 Ed : 1A 1/7 ICC03-400B2 ABSOLUTE MAXIMUM RATINGS : THYRISTOR TH Symbol Parameter Value Unit ITRM Repetitive peak on-state current (Note1) Tl=110 °C 100 A ITSM Non repetitive surge peak on-state current Tj initial = 25 °C tp = 20 µs 150 A tp = 10 ms 5 A Tj = 125°C 400 V VDRM Repetitive peak off-state voltage ABSOLUTE MAXIMUM RATINGS : DIODES Symbol Value Parameter Unit D1 D2 IFRM Repetitive peak forward current (Note 1) Tl= 110 °C 1 100 A IFSM Non repetitive surge forward current Tj initial = 25 °C tp = 20 µs 15 150 A tp = 10 ms 2 5 A Tj= 125 °C 25 400 V VRRM Repetitive peak off-state voltage Note 1: Test current waveform 20 s 6ms ABSOLUTE MAXIMUM RATINGS : FOR ALL DEVICE (ICC03) Symbol T stg Tj Tl Parameter Storage temperature range Operating junction temperature range Maximum lead temperature for soldering during 10s Value Unit - 40 to + 150 - 40 to + 150 °C 260 °C Value Unit THERMAL RESISTANCES Symbol Parameter Rth(j-a) Thermal resistance junction to ambient 100 °C/W Rth(j-l) Thermal resistance junction to lead 15 °C/W 2/7 ICC03-400B2 ELECTRICAL CHARACTERISTICS : THYRISTOR TH Symbol Test Conditions Value Unit IGT VD=12V (DC) RL=33Ω Tj= 25°C MAX 1 mA VGT VD=12V (DC) RL=33Ω Tj= 25°C MAX 1.5 V VTM ITM= 4A tp ≤ 1ms Tj= 25°C MAX 1.9 V IDRM VDRM rated Tj= 25°C MAX 50 µA Tj= 125°C MAX 1 mA Value Unit ELECTRICAL CHARACTERISTICS : DIODE D1 Symbol IR VF Test Conditions VR = VRRM IF = 100 mA tp ≤ 1ms Tj= 25°C MAX 50 µA Tj= 125°C MAX 1 mA Tj= 25°C MAX 1.2 V Value Unit ELECTRICAL CHARACTERISTICS : DIODE D2 Symbol IR VF Test Conditions VR = VRRM IF = 4 A tp ≤ 1ms Tj= 25°C MAX 50 µA Tj= 125°C MAX 1 mA Tj= 25°C MAX 1.9 V ORDERING INFORMATION ICC 03 - 400 B2 IGNITION CONTROL CIRCUIT CIRCUIT NUMBER 03 : SCR + 2 DIODES PACKAGE : B2 : DIL8 VOLTAGE = 400 V 3/7 ICC03-400B2 Fig.1 : Relative variation of gate trigger current versus junction temperature. Igt [Tj] / Igt [Tj=25 o C] 4 3.5 3 2.5 2 1.5 1 0.5 Tj ( o C) 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 Fig.2 : Safety limitation curve of the capacitor voltage variation versus RPM @ tp=20µs. Vcapa (V) 450 Tamb=70 o C 400 350 Tj=150 oC Limitation VD R M limitation 300 Ip 0.6 Ip 250 0.4 Ip 200 20 µs 150 0 2000 4000 6000 RPM 4/7 8000 10000 12000 ICC03-400B2 BASIC APPLICATION Ic STOP BUTTON t 1 D1 SUPPLY COIL ICC03 D2 IGNITION COIL C1 8 6 7 L1 D3 4 N D4 SPARK Ic TH Ig PLUG 3 PR R P SE Vs + Vs C2 _ t FLY-WHEEL SENSOR COIL see functional diagram page 1 The applications using the capacitive ignition system (CDI) operate in 3 phases. PHASE 1 Storage of the energy in the capacitor C1 PHASE 2 Discharge of the capacitor C1 and spark generationto the ignition coil. PHASE 3 Engine stop. 1) ENERGY STORAGE IN C1 The coil L1 generates an alternative voltage. Its positive part charges the capacitor C1 through the diode D2. The negative waves are clamped by the diode D3. The negative sinewave generated is clamped by D4 while the positive sinewave initiates a current IG through the thyristor gate (Th) The firing of the SCR causes an alternating discharge current Ic through the capacitor C1. The positive parts of this current flow in the loop C1, Th and the primary of the ignition coil PR. The negative parts flow through C1, PR and both diodes D3 and D2. 3) ENGINE STOP The engine stop is obtained by short circuiting the supply coil L1 (stop button). The diode D1 avoids the accidental connection of battery voltage. 2) SPARK GENERATION For each fly-wheel revolution the sensor coil produces a bidirectional pulse Vs and triggers the ignition coil. 5/7 ICC03-400B2 ALTERNATIVE APPLICATION SUPPLY COIL D C1 IGNITION COIL 6/7 SPARK STOP R1 N ICC03 4 PR 1 D1 R P Vs 3 C2 FLY-WHEEL SENSOR COIL see functional diagram page 1 With this type of alternative application, the operationphases will be the same but the topology of component integrationis different. This topology is adapted to applications using the diode D2 in anti-parallel with the thyristor. In this case the rectifier diode D must withstand a reversed voltage up to 1500V following the value of R1. With this configurationthe current Ic oscillates, and its positive part flows through thyristor TH, while diode D2 assumes the conduction of the negative parts. 6/7 PLUG D2 TH 8 SE ICC03-400B2 R RESISTOR CALCULATION PROTECTION AGAINST PARASITIC SPIKES The purpose of the resistor R is to limit the current IG through the thyristor gate. Its maximum value can be calculated as follow : R max = (Vs min - VGT max) / 2 IGT max The capacitor C2 in relation with R acts as a filter and avoids the unexpected firing of the thyristor due to parasitic spikes. Good results have been obtained with 10nF capacitance. POWER LOSSES (For 20µs - see note 1) The following equations can be used to evaluate power losses : For TH VTO = 2.65V Rt = 0.110 Ω For D2 VFO = 1.73V Rd = 0.075 Ω PACKAGE MECHANICAL DATA DIL8 (Plastic) DIMENSIONS REF. I a1 B1 B b b1 L F e Z E e3 D 8 5 1 4 Millimetres Inches Min. Typ. Max. Min. Typ. Max. a1 0.70 0.027 B B1 1.39 0.91 1.65 0.055 1.04 0.036 b b1 0.5 0.38 D 0.065 0.041 0.020 0.50 0.015 0.020 9.80 0.385 E e 8.8 2.54 0.346 0.100 e3 7.62 0.300 F I 7.1 4.8 L Z 3.3 0.44 0.280 0.189 0.130 1.60 0.017 0.063 Marking : ICC3-400 Weight : 0.59 g Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsIbility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 1998 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Swit zerland - Taiwan - Thailand - United Kingdom - U.S.A. 7/7