®
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 (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
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
1/7
ICC03-400B2
ABSOLUTE MAXIMUM RATINGS : THYRISTOR TH
Symbol
I
TRM
I
TSM
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
µs
tp = 10 ms
T
j
= 125
°
C
Value
100
150
5
400
Unit
A
A
A
V
V
DRM
ABSOLUTE MAXIMUM RATINGS : DIODES
Symbol
I
FRM
I
FSM
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
µs
tp = 10 ms
Tj= 125
°
C
1
15
2
25
Value
D2
100
150
5
400
A
A
A
V
Unit
V
RRM
Note 1: Test current waveform
20 s
6ms
ABSOLUTE MAXIMUM RATINGS : FOR ALL DEVICE (ICC03)
Symbol
T
stg
T
j
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
2/7
ICC03-400B2
ELECTRICAL CHARACTERISTICS : THYRISTOR TH
Symbol
I
GT
V
GT
V
TM
I
DRM
Test Conditions
V
D
=12V (DC) R
L
=33
Ω
V
D
=12V (DC) R
L
=33Ω
I
TM
= 4A tp
≤
1ms
V
DRM
rated
Tj= 25
°
C
Tj= 25°C
Tj= 25°C
Tj= 25
°
C
Tj= 125
°
C
MAX
MAX
MAX
MAX
MAX
Value
1
1.5
1.9
50
1
Unit
mA
V
V
µ
A
mA
ELECTRICAL CHARACTERISTICS : DIODE D1
Symbol
I
R
V
R
= V
RRM
Test Conditions
Tj= 25
°
C
Tj= 125°C
V
F
I
F
= 100 mA tp
≤
1ms
Tj= 25°C
MAX
MAX
MAX
Value
50
1
1.2
Unit
µ
A
mA
V
ELECTRICAL CHARACTERISTICS : DIODE D2
Symbol
I
R
V
R
= V
RRM
Test Conditions
Tj= 25
°
C
Tj= 125
°
C
V
F
I
F
= 4 A tp
≤
1ms
Tj= 25°C
MAX
MAX
MAX
Value
50
1
1.9
Unit
µ
A
mA
V
ORDERING INFORMATION
ICC
IGNITION CONTROL
CIRCUIT
CIRCUIT NUMBER
03 : SCR + 2 DIODES
03 - 400
B2
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
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=20µs.
Vcapa (V)
450
Tamb=70
o
C
400
350
300
Ip
0.6 Ip
V
D R M
limitation
Tj=150
o
C Limitation
250
200
20
µ
s
0.4 Ip
150
0
2000
4000
6000
RPM
8000
10000
12000
4/7
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.
5/7
The negative sinewave generated is clamped by
D4 while the positive sinewave initiates a current
I
G
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.
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