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(R)
ICC03-400B2
IGNITION CONTROL CIRCUIT
Application Specific Discretes A.S.D.TM
FEATURES AND BENEFITS MONOLITHIC CIRCUIT FOR CAPACITANCE DISCHARGE SYSTEM CONTROL. DEDICATED THYRISTOR STRUCTURE FOR IGNITION OPERATION. APPLICATIONSPECIFIC DISCRETES (ASDTM). 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 See basic application and functionality page 4.
FUNCTIONAL DIAGRAM
TOP VIEW
01
08
D1
02 03
D2
07 06
TH
04 05
September 1998 Ed : 1A
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ICC03-400B2
ABSOLUTE MAXIMUM RATINGS : THYRISTOR TH Symbol ITRM ITSM Parameter Repetitive peak on-state current (Note1) Non repetitive surge peak on-state current Tj initial = 25 C Repetitive peak off-state voltage Tl=110 C tp = 20 s tp = 10 ms Tj = 125C Value 100 150 5 400 Unit A A A V
VDRM
ABSOLUTE MAXIMUM RATINGS : DIODES Symbol IFRM IFSM Parameter D1 Repetitive peak forward current (Note 1) Non repetitive surge forward current Tj initial = 25 C Repetitive peak off-state voltage Tl= 110 C tp = 20 s tp = 10 ms Tj= 125 C 1 15 2 25 Value D2 100 150 5 400 A A A V Unit
VRRM
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 - 40 to + 150 - 40 to + 150 260 Unit C C
THERMAL RESISTANCES Symbol Rth(j-a) Rth(j-l) Parameter Thermal resistance junction to ambient Thermal resistance junction to lead Value 100 15 Unit C/W C/W
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ICC03-400B2
ELECTRICAL CHARACTERISTICS : THYRISTOR TH Symbol IGT VGT VTM IDRM Test Conditions VD=12V (DC) RL=33 VD=12V (DC) RL=33 ITM= 4A tp 1ms VDRM rated Tj= 25C Tj= 25C Tj= 25C Tj= 25C Tj= 125C MAX MAX MAX MAX MAX Value 1 1.5 1.9 50 1 Unit mA V V A mA
ELECTRICAL CHARACTERISTICS : DIODE D1 Symbol IR VR = VRRM Test Conditions Tj= 25C Tj= 125C VF IF = 100 mA tp 1ms Tj= 25C MAX MAX MAX Value 50 1 1.2 Unit A mA V
ELECTRICAL CHARACTERISTICS : DIODE D2 Symbol IR VR = VRRM Test Conditions Tj= 25C Tj= 125C VF IF = 4 A tp 1ms Tj= 25C MAX MAX MAX Value 50 1 1.9 Unit A mA V
ORDERING INFORMATION
ICC
IGNITION CONTROL CIRCUIT CIRCUIT NUMBER 03 : SCR + 2 DIODES
03 - 400
B2
PACKAGE : B2 : DIL8 VOLTAGE = 400 V
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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 0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 Tj ( o C)
Fig.2 : Safety limitation curve of the capacitor voltage variation versus RPM @ tp=20s.
Vcapa (V)
450
Tamb=70 o C
400 350 300
Ip 0.6 Ip
VD R M limitation
Tj=150 oC Limitation
250 200
20s
0.4 Ip
150
0
2000
4000
6000
RPM
8000
10000
12000
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ICC03-400B2
BASIC APPLICATION
Ic
STOP BUTTON 1 SUPPLY COIL D1 8
t
IGNITION COIL
D2
ICC03
6 7
C1
L1 N
D3
4
Ig 3
TH
Ic
SPARK PLUG
D4
PR
SE
P
R
Vs +
Vs FLY-WHEEL SENSOR COIL
C2
_
t
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. 2) SPARK GENERATION For each fly-wheel revolution the sensor coil produces a bidirectional pulse Vs and triggers the ignition coil.
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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.
ICC03-400B2
ALTERNATIVE APPLICATION
SUPPLY COIL
D 6/7 STOP
C1
IGNITION COIL
SPARK R1
ICC03
4 1 D1
N
TH
D2
PLUG
PR
SE
P
R
3
8
Vs FLY-WHEEL SENSOR COIL
C2
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.
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ICC03-400B2
R RESISTOR CALCULATION 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 POWER LOSSES (For 20s - see note 1) The following equations can be used to evaluate power losses : For TH VTO = 2.65V Rt = 0.110 For D2 VFO = 1.73V Rd = 0.075 PROTECTION AGAINST PARASITIC SPIKES 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.
PACKAGE MECHANICAL DATA DIL8 (Plastic) DIMENSIONS REF. a1
b1
Millimetres Inches Min. Typ. Max. Min. Typ. Max. 0.70 1.39 0.91 0.5 0.38 8.8 2.54 7.62 7.1 4.8 3.3 0.44 1.60 0.017 0.130 0.063 0.50 0.015 9.80 0.346 0.100 0.300 0.280 0.189 0.027 1.65 0.055 1.04 0.036 0.020 0.020 0.385 0.065 0.041
I
a1
L
B B1 b b1 D E e
B
B1
F
b
Z
e e3 D E
8
5
e3 F I L Z
1
4
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 (c) 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.
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