SGS Thomson Microelectronics VB024 Datasheet

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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