Datasheet VB027BSP Datasheet (SGS Thomson Microelectronics)



VB027BSP

HIGH VOLTAGE IGNITION COIL DRIVER

POWER I.C.

TYPE V

VB027BSP 320V 10.5A 160mA

■ PRIMARY COIL VOLTAGE INTERNALLY SET

■ COIL CURRENT LIMIT INTERNALLY SET

■ LOGIC LEVELCOMPATIBLEINPUT

■ DRIVING CURRENT QUASI PROPORTIONAL

cl

I

cl

I

d(on)

TO COLLECTOR CURRENT

■ DOUBLE FLAG-ON COIL CURRENT

DESCRIPTION

The VB027BSP isa high voltage power integrated
circuit made using the STMicroelectronics
VIPower 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

BLOCK DIAGRAM

V

d

10

1

PowerSO-10

voltage, high current interface in advanced
electronic ignition system.

HV

C

INPUT

OVERTEMP.

PROTECTION

FLAG 1

FLAG

June 1999 1/7

FLAG 2

+

-

-

+

DRIVER

QUASI PROP.
BASE CURRENT

REFERENCE

R

SENSE

VB027BSP

ABSOLUTE MAXIMUM RATING

Symbol Parameter Value Unit

HV

I

V

I

V

T

T

THERMAL DATA

Symbol Parameter Value Unit

R

thj-case

R

thj-amb

CONNECTION DIAGRAM (TOP VIEW)

Collector voltage Internally limited V

c

Collector current Internally limited A

C

Driving stage supply voltage 7 V

d

Driving circuitry supply current 200 mA

d

Input voltage 10 V

IN

Junction operating temperature -40 to 150 °C

j

Storage temperature -55 to 150 °C

stg

Thermal resistance junction-case (MAX) 1.12 °C/W
Thermal resistance junction-ambient (MAX) 62.5 °C/W

GND
V

d

N.C.
INPUT
DIAG

HV

6
7

8
9

10

11

C

5
4
3

2
1

PIN FUNCTION

No Name Function

1÷5 GND Emitter power ground

6(*) GND Control ground

7V

d

8 N.C.
9 INPUT Logic input channel

10 DIAG Diagnostic output signal (whenI

TAB HV

(*) Pin 1÷5=Power GND, Pin 6=signal GND. Pin 6 must be connected to pins 1÷5 externally.

C

Driving stage supply voltage

Primary coil output signal

GND
GND
GND
GND
GND

is greaterthan 3A)

C

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1

VB027BSP

ELECTRICAL CHARACTERISTICS (V

specified)

=13.5V; Vd=5V; Tj=25ºC; R

CC

coil

=510m

Ω;

L

=7mH unless otherwise

coil

Symbol Parameter Test Conditions Min Typ Max Unit

V

V

cg(sat)

I

d(off)

I

d(on)

V

I

I

cl(td)

I

leak

V

INH

V

INL

I

INH

V

diagH

V

diagL

I

C(diag1)

High voltage clamp -40°C≤Tj≤125°C; IC=6A 320 420 V

cl

Power stage saturation
voltage

IC=6A; VIN=4V; -40°C≤Tj≤125°C2V

Power-off supply current VIN=0.4V 11 mA
Power-on supply current VIN=4V; IC=6A; -40°C≤Tj≤125°C 160 mA
Driving stage supply

d

voltage
Collector current limit VIN=4V 8.5 10.5 A

cl

Collector current limit drift
with temperature

See figure 3

4.5 5.5 V

Collector leakage current Vc=125V 100 µA
High level input voltage 4 5.5 V
Low level input voltage 0 0.8 V
High level input current 200 µA
High level diagnostic

output voltage
Low level diagnostic

output voltage
First threshold level

collector current

R

=15K

Ω;

C

EXT

R

=22K

EXT

=1nF (See figure 1) 3.5 V

EXT

Ω;

C

=1nF (See figure 1) 0.5 V

EXT

4.25 4.5 4.75 A

d

First threshold level

I

C(diag1)td

I

C(diag2)

collector current drift with
temperature

Second threshold level
collector current

See figure 4

5.45 5.8 6.15 A

Second threshold level

I

C(diag2)td

I

diagH

t

d(off)

t

f(off)

E

T

T

hys

V

collector current drift with

See figure 5

temperature
Overtemperature

diagnostic current
Turn-off delay time of

output current
Turn-off fall time of output

current
Single pulse avalanche

s/b

energy
Temperatureofdiagnostic

int

shift

IC=6A 5 25 45 µs

IC=6A 2 8 15 µs

22.63.2A

300 mJ

130 150 170 °C

Thermal hysteresis 30 °C
Diode forward voltage IC= -10A 3 V

f

V

3/7

1

VB027BSP

PRINCIPLE OF OPERATION

The VB027BSP is mainly intended as high voltagepower
switch device driven by a logic level input and interfaces
directly to a high energy electronic ignition coil.

The input V
signal generated by an external controller thatdetermines
both dwell time and ignition point. During V
the VB027BSP increases current inthe coil tothe desired,

of the VB027BSP is fed from a low power

IN

high (≥4V)

IN

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 µC forces the
V

to the low state. During the coil currentswitch-off, the

IN

primary voltage HV
diodes at aninternally set value V

The collector currentsensed throughthe R
thanks to the“Current limiter” block that, as soon as theI

is clamped by a series of Zener

C

typically 365V.

cl

sense

, is limited

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
current due to leakage inductances and stray

) is pulled below ground by a negative

C

capacitances of the ignition coil. Thiscan cause parasitic
glitches on the diagnostic output. VB027BSP has a built­in protection circuit that allows to lock the p-buried layer
potential of the linear stage to the collector power, when
the last one is pulledunderground.

FIGURE 1: Application circuit

THERMAL BEHAVIOUR

You cansee in the block diagram of the VB027BSP a box
called overtemperature protection. The purpose of this
circuit is to shift the current level at which the first
diagnostic is activated down to about 2.5A.

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 whento
switch-off the device after the first flag threshold.

EXAMPLE:

I

C(DIAG1)

cl

I

switch-off

info after x ms (I

info after kx ms.

C(DIAG1)

=4.5A)

As soon as the temperature rises over the overtemp
threshold, the first diagnostic is shifted down to about

2.5A and, in this example, the switch-off current will be
kx*2.5 / 4.5.

OVERVOLTAGE

The VB027BSPcan withstand the following transients of
the battery line:

-100V /2ms (R
+100V / 0.2ms (R
+50V / 400ms (R

=10Ω)

i

=10Ω)

i

=4.2 Ω, with VIN=3V)

i

4/7

FIGURE 2: Switching waveform

V

IN

2ndThreshold

st

1

Threshold

I

cl

DIAG

VB027BSP

FIGURE 3: Maximum IclVS temperature

FIGURE 5: I

C(diag2)

VS temperature

FIGURE 4: I

FIGURE 6: V

[V]

1.7

1.6

1.5

1.4

1.3

1.2

1.1

-40 25 125

VS temperature

C(diag1)

VS temperature (at IC=6A)

cg(sat)

Temperature[°C]

max
Avg
min

5/7

1

1

PowerSO-10 MECHANICAL DATA

VB027BSP

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

mm. inch

A 3.35 3.65 0.132 0.144

A1 0.00 0.10 0.000 0.004

B 0.40 0.60 0.016 0.024

c 0.35 0.55 0.013 0.022

D 9.40 9.60 0.370 0.378

D1 7.40 7.60 0.291 0.300

E 9.30 9.50 0.366 0.374
E1 7.20 7.40 0.283 0.291
E2 7.20 7.60 0.283 300
E3 6.10 6.35 0.240 0.250
E4 5.90 6.10 0.232 0.240

e 1.27 0.050
F 1.25 1.35 0.049 0.053
H 13.80 14.40 0.543 0.567

h 0.50 0.002
Q 1.70 0.067
α 0º 8º

B

B

Q

0.10 A

E1E3

==

SEATING
PLANE

A

C

α

E4

==

SEATING

PLANE

A1

L

==

==

==

HE

h

A

F

A1

610

51

eB

M

0.25

D

==

D1

==

E2

==

DETAIL”A”

DETAIL”A”

6/7

1

VB027BSP

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of use of such information nor for any infringement of patents or other rights of third parties which may results 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 componentsin life support devices or systems without express written approvalof STMicroelectronics.

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