June 1999
1/9
VB027
/
VB027(011Y) / VB027(012Y)
HIGH VOLTAGE IGNITION COIL DRIVER
POWER I.C.
s
PRIMARY COIL VOLTAGE INTERNALLY SET
s
COIL CURRENT LIMIT INTERNALLY SET
s
LOGIC LEVEL COMPATIBLE INPUT
s
DRIVING CURRENT QUASI PROPORTIONAL
TO COLLECTOR CURRENT
s
DOUBLE FLAG-ON COIL CURRENT
DESCRIPTION
The VB027, VB027(011Y), VB027(012Y) is a high
voltage power integrated circuit made using the
STMicroelectronics VIPower
TM
technology, with
vertical current flow power darlington and logic
level compatible driving circuit. Built-in protection
circuit for coil current limiting and collector voltage
clamping allows the device to be used as smart,
high voltage, high current interface in advanced
electronic ignition system.
TYPE
V
cl(min)
I
cl(max)
I
d(on)max
VB027
VB027(011Y)
VB027(012Y)
300V
9A
130mA
BLOCK DIAGRAM
DRIVER
GND
OVERTEMP.
FLAG 1
REFERENCE
PROTECTION
R
SENSE
V
d
HV
C
FLAG
INPUT
FLAG 2
QUASI PROP.
BASE CURRENT
PENTAWATT HV
+
-
+
-
PENTAWATT HV (011Y)
PENTAWATT HV (012Y)
ORDER CODES:
PENTAWATT HV
PENTAWATT HV (011Y)
VB027
VB027(011Y)
PENTAWATT HV (012Y)
VB027(012Y)
2/9
VB027 / VB027(011Y) / VB027(012Y)
1
ABSOLUTE MAXIMUM RATING
THERMAL DATA
CONNECTION DIAGRAM (TOP VIEW)
Symbol
Parameter
Value
Unit
HV
c
Collector voltage
Internally limited
V
I
C
Collector current
Internally limited
A
V
d
Driving stage supply voltage
7
V
I
d
Driving circuitry supply current
200
mA
V
IN
Input voltage
10
V
T
j
Junction operating temperature
-40 to 150
C
T
stg
Storage temperature
-55 to 150
C
Symbol
Parameter
Value
Unit
R
thj-case
Thermal resistance junction-case
(MAX)
1.12
C/W
R
thj-amb
Thermal resistance junction-ambient
(MAX)
62.5
C/W
PIN FUNCTION (PENTAWATT HV)
No
Name
Function
1
GND
Emitter power ground
2
V
d
Driving stage supply voltage
3
HV
C
Primary coil output signal
4
INPUT
Logic input channel
5
DIAG
Diagnostic output signal
5
4
3
2
1
HV
C
GND
V
d
INPUT
DIAG
3/9
VB027 / VB027(011Y) / VB027(012Y)
ELECTRICAL CHARACTERISTICS
(V
CC
=13.5V; V
d
=5V; Tj=25C; R
coil
=510m
;
L
coil
=7mH unless otherwise
specified)
Note 1: the primary coil current value I
cl
must be measured 1ms after desaturation of the power stage.
Note 2: time from input switching V
NEG
until collector voltage equal 200V.
(*) V
d
- V
be(on)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
V
cl
High voltage clamp
-40
C
T
j
125
C; I
C
=6A
300
360
400
V
V
cg(sat)
Power stage saturation
voltage
I
C
=6A; V
IN
=4V
1.5
V
V
cg(sat)td
Power stage saturation
voltage derating in
temperature
I
C
=6A; V
IN
=4V; -40
C
T
j
125
C
2
V
I
d(off)
Power-off supply current
V
IN
=0.4V
10
mA
I
d(on)
Power-on supply current
V
IN
=4V; I
C
=6A; -40
C
T
j
125
C
130
mA
V
d
Driving stage supply
voltage
4.5
5.5
V
I
cl
Collector current limit
V
IN
=4V (See note 1)
8
8.5
9
A
I
cl(td)
Collector current limit drift
with temperature
See figure 3
V
INH
High level input voltage
4
5.5
V
V
INL
Low level input voltage
0
0.8
V
I
INH
High level input current
V
IN
=4V
200
A
V
diagH
High level diagnostic
output voltage
R
EXT
=22K
(See figure 1)
3.5
(*)
V
d
V
V
diagL
Low level diagnostic
output voltage
R
EXT
=22K
(See figure 1)
0.5
V
I
C(diag1)
First threshold level
collector current
4.25
4.5
4.75
A
I
C(diag1)td
First threshold level
collector current drift with
temperature
See figure 4
I
C(diag2)
Second threshold level
collector current
5.45
5.8
6.15
A
I
C(diag2)td
Second threshold level
collector current drift with
temperature
See figure 5
t
d(off)
Turn-off delay time of
output current
I
C
=6A; (See note 2)
25
s
t
f(off)
Turn-off fall time of output
current
I
C
=6A
8
s
t
d(diag)
Delay time of diagnostic
current
R
EXT
=22K
(See figure 1)
1
s
t
r(diag)
Turn-on rise time of
diagnostic current
R
EXT
=22K
(See figure 1)
1
s
t
f(diag)
Turn-off fall time of
diagnostic current
R
EXT
=22K
(See figure 1)
1
s
1
4/9
VB027 / VB027(011Y) / VB027(012Y)
1
PRINCIPLE OF OPERATION
The
VB027, VB027(011Y), VB027(012Y)
is mainly
intended as high voltage power switch device driven by a
logic level input and interfaces directly to a high energy
electronic ignition coil.
The
input
V
IN
of
the
VB027,
VB027(011Y),
VB027(012Y)
is fed from a low power signal generated
by an external controller that determines both dwell time
and ignition point. During V
IN
high (
4V) the
VB027,
VB027(011Y), VB027(012Y)
increases current in the
coil to the desired, internally set current level.
When the collector current exceeds 4.5A, the diagnostic
signal is turned high and it remains so, until the load
current reaches 5.8A (second threshold). At that value,
the diagnostic signal is turned low, and the
C forces the
V
IN
to the low state. During the coil current switch-off, the
primary voltage HV
C
is clamped by a series of Zener
diodes at an internally set value V
cl
, typically 360V.
The collector current sensed through the R
sense
, is limited
thanks to the "Current limiter" block that, as soon as the I
cl
level is reached, forces the darlington (using the "Driver"
block) to limit the current provided.
The transition from saturation to desaturation, coil current
limiting phase, must have the ability to accommodate an
overvoltage. A maximum overshoot of 20V is allowed.
There can be some short period of time in which the
output pin (HV
C
) is pulled below ground by a negative
current
due
to
leakage
inductances
and
stray
capacitances of the ignition coil. This can cause parasitic
glitches
on
the
diagnostic
output.
VB027,
VB027(011Y), VB027(012Y)
has a built-in protection
circuit that allows to lock the p-buried layer potential of the
linear stage to the collector power, when the last one is
pulled underground.
THERMAL BEHAVIOUR
You can see in the block diagram of the
VB027,
VB027(011Y),
VB027(012Y)
a
box
called
overtemperature protection. The purpose of this circuit is
to shift the current level at which the first diagnostic is
activated down of about 1A.
This information can be managed by the micro that can
take the corrective action in order to reduce the power
dissipation. This block is not an effective protection but
just an overtemperature detection. The shift down of the
first flag level cannot be present for temperatures lower
than 125
C.
As an example of its behavior you can suppose a very
simple motor management system in which the micro
does just a simple arithmetic calculation to decide when to
switch-off the device after the first flag threshold.
EXAMPLE:
I
C(DIAG1)
info after x ms (I
C(DIAG1)
=2.5A)
I
switch-off
info after kx ms.
As soon as the temperature rises over the overtemp
threshold, the first diagnostic is shifted down to about
1.5A and, in this example, the switch-off current will be
kx*1.5 / 2.5.
OVERVOLTAGE
The
VB027,
VB027(011Y),
VB027(012Y)
can
withstand the following transients of the battery line:
-100V / 2ms (R
i
=10
)
+100V / 0.2ms (R
i
=10
)
+50V / 400ms (R
i
=4.2
,
with V
IN
=3V)
FIGURE 1: Application circuit
5/9
VB027 / VB027(011Y) / VB027(012Y)
1
FIGURE 2: Switching waveform
FIGURE 3:
Maximum
I
cl
VS temperature
FIGURE 5: I
C(diag2)
VS temperature
FIGURE 4: I
C(diag1)
VS temperature
1
V
IN
2
nd
Threshold
1
st
Threshold
I
cl
DIAG
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