
VB024
HIGH VOLTAGE IGNITION COIL DRIVER
POWER IC
TYPE V
VB024 400 V 8 A 100 mA
■ PRIMAR YCOILCURR E NTINTERN A LL Y SET
■ PRIMARY COIL VOLTAGE INTERNALLY SET
■ AUTOMATIC SHUT-OFF ATMAX CURRENT
■ LOGIC LEVEL COMPATIBLE INPUT
■ DIGITAL SIGNAL FEEDBACK TO INDICATE
CL
I
C
I
d
A PREDETERMINED CURRENT LEVEL
DESCRIPTION
The VB024 is a high voltage integrated circuit
made using SGS-THOMSON VIPower thecnology,
with vertical current flow power darlington and logic
level compatible drivingcircuit.
The device performs the following functions:
power stage for driving the primary side of the
ignition coil, digital signal feedback to the control
IC to indicate a predetermined current level,
automatic shut-off at maximum current, self
clamping for voltage flyback and logic level input.
BLOCK DIAGRAM
ISOWATT7
September 1993
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VB024
ABSOLUTE MAXIMUM RATING
Symbol Parameter Value Uni t
HV
I
V
I
V
V
I
T
T
THERMAL DATA
R
thj-case
R
thj-amb
CONNECTION DIAGRAM
Collector V olt age Internally Limited V
C
Collector Cur r en t Int ernally Lim i te d A
C
Driving St age Supply Volta ge 16 V
d
Driving Circuitry Su pply Current 600 mA
d
Maximum Input V olt age 10 V
in
Contr ol Circuitry Supply V olt age 8 V
s
Control Circuitry Supply Current 200 mA
s
Oper at ing Junction Tem pe r at ur e -40 to 150
j
St or a ge T emperature Ran ge -55 to 150
stg
Thermal R esis t ance Junc t ion Case (MA X) 2.5
Thermal Resistance Junction Ambient (MAX) 30
o
o
o
C/W
o
C/W
C
C
PIN FUNCTION
No NAME FUNCTI O N
1 GND Emit ter Power and Cont r o l Ground
2 LAT C H ENABLE Enable s Of The Lat ch Circ uitry W hich T ur n Of f The Driver
3 Vd Supply Volta ge For The Powe r S t age
4 OUT Out put to T h e Pri mar y Coil
5 Vs Supply V olt age For The Contr ol Stage
6INPUT
7 FLAG Out put of A Logic S ig nal When Ic Is Gr eat er Than 3 A
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VB024
ELECTRICAL CHARACTERISTICS (Vb=12V;Vs= 5 V Regulated;Tj=25oC; R
L
= 6mH unless otherwise specified)
coil
Symbol Parameter Test C onditi ons Mi n. Typ. Max. Unit
V
V
ce(sat)
I
s(on)
V
I
d(on)
V
I
diag
V
V
I
inH
V
V
neg
V
I
c(max)
t
V
diagH
V
diagL
Note 1: Ti me f r on i nput switching V
High Voltage Clam p Vin=0.4V -40oC≤Tj≤125oC320 510V
cl
Sat uration Voltage of
The Power Stage
Contr ol Circuit Supply
Current
Contr ol Circuit Supply
s
Volt age
Driver Stage S tand-by
Current
Driver Stage S upply
d
Volt age
Diagnostic Current at
Wic h The Flag Switches
High Lev e l Input Voltage 4 5.5 V
inH
Low Lev e l Input Voltage 0 0.2 V
inL
High Lev e l Input Curr ent Vin=5.5V 20 600 µA
Positive T hreshold 2.8 3.2 V
pos
Negative T hr eshold 1.3 1.7 V
Hyst eresis Voltage 1.3 1.7 V
hys
Turn-Of f Current Vin=4V -40oC≤Tj≤125oC7.3 8.8A
Switc h-Off Ti me Ic=6A(seenote1) 10 80 µs
off
High Lev e l Diagnostic
Output Voltage
Low Lev e l D ia gnostic
Output Volatge
neg
Ic=6A; Id=80mA; Vin=4V 2 V
4.5 5.5 V
Vin=4V 180 mA
5.5 16 V
-40oC ≤ Tj≤ 125oC 2.75 3 .35 mA
R
=20KΩ 44.5V
flag
R
= 100 KΩ 0.1 V
flag
until VCLdrops t o 200 V
=500 mΩ;
coil
15 mA
PRINCIPLE OF OPERATION
The VB024 is designed to drive the primary side
of an ignition coil and provide a logic signal
output to indicate a predetermined coil current
level. This output signal is used to perform dwell
control. This part is intended for use in Engine
Control Modules. It could also be used in an
ignition module or integrated into an ignition coil
assembly.
The VB024 accepts an input High signal from the
control IC to start charging the primary side of the
ignition coil. When the primary coil current
reaches 3 amps, the VB024 outputs a logic High
signal to the control IC. This flag signal is used in
the calculation of the dwell time.
This device also has a maximum primary coil
current I
c(max)
Shut-off feature. I
c(max)
equals
aproximately 1.5 times the nominal primary coil
currnet. If the Ic reaches I
, the output stage
c(max)
will Shut-off causing the spark to occour.
The VB024 is also internally clamped to protect it
from the flyback voltage of the primary
inductance as the output stage is turned off.
OVERVOLTAGE
The VB024 withstand the following transient test
performed using a ”Schaffner” equipment at TA=
80oC:
1) LOAD DUMP
Ten pulses with 10 second intervals between
each transient. The device withstand load dump
while fully on, fully off and during the transition
between states (see figures 3 and 4).
2) NEGATIVE TRANSIENTS
Ten negative transients with 10 second intervals
between each transient (see figure 5).
3) REVERSE BATTERY
Inversion of battery voltage for a time = 60 sec
(see figure 5).
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VB024
FIGURE1: Application Circut
FIGURE2: Switching Waveforms
4/8

FIGURE 3: Load Dump Test Circut
VB024
FIGURE 4: Load Dump Input Waveform
5/8

VB024
FIGURE 5: Negative Transients Test Circut
FIGURE 6: Reverse Battery Test Circuit
(*) T his resi stor represents v ehicle wiring harness r esistance
6/8

ISOWATT7 MECHANICAL DATA
VB024
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
mm inch
A 5.35 5.65 0.210 0.222
B 3.4 3.7 0.133 0.145
C 0.8 1.28 0.031 0.050
D 2.95 3.1 0.116 0.122
D1 1.95 2.15 0.076 0.084
E 0.5 0.6 0.019 0.023
F 1.1 0.043
F1 0.7 0.8 0.027 0.031
F2 1.4 0.055
G 4.88 5.28 0.192 0.207
G1 7.42 7.82 0.292 0.308
G2 9.96 10.36 0.392 0.408
H 15.9 16.1 0.626 0.634
L1 19.85 20.15 0.781 0.793
L2 19.35 19.65 0.761 0.773
L3 8.9 9.1 0.350 0.358
L4 28 29 1.102 1.141
L5 4.9 5.1 0.193 0.201
L6 15.9 16.1 0.626 0.634
L7 2.1 2.3 0.082 0.090
L8 23 23.4 0.905 0.921
L9 24.8 25.2 0.976 0.992
L10 19.8 20.2 0.779 0.795
L11 17.7 18.3 0.697 0.720
M 7.83 8.33 0.308 0.328
N 2.75 3.25 0.108 0.128
∅ 3.5 3.7 0.138 0.145
L9
L10
L11
A
B
C
L3
Ø
H
Dia.
L5 L6
D
L2
L1
L8
L4
D1
E
M
N
F2
F1
==
==
=G=
=G1 =
= G2 =
F
L7
P033B
7/8

VB024
Information furnished is believed to be accurate and reliable.However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information norfor any infringement of patents or other rights of third parties which may results from its use. No
license isgranted byimplication orotherwise underany patentor patentrights ofSGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes andreplaces all information previously supplied.
SGS-THOMSON Microelectronicsproducts are notauthorized foruse ascritical componentsinlife supportdevices or systemswithoutexpress
written approvalof SGS-THOMSON Microelectonics.
1994 SGS-THOMSON Microelectronics- All Rights Reserved
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