VB027ASP
HIGH VOLTAGE IGNITION COIL DRIVER
POWER IC
TYPE V
VB027A SP 345 V 9.5 A 160 mA
■ PRIMARYCOIL VOLTAGE INTERNALLY SET
■ COILCURRENT LIMIT INTERNALLYSET
■ LOGIC LEVEL COMPATIBLE INPUT
■ DRIVINGCURRENT QUASI
clamp
I
cl
Ilim
PROPORTIONALTO COLLECTOR
CURRENT
■ DOUBLE FLAG-ONCOIL CURRENT
DESCRIPTION
The VB027ASP is a high voltage power
integratedcircuits made using STMicroelectronics
Vertical Intelligent Power Technology, with
vertical current flow power darlington and logic
level compatibledriving circuits.
Built-in protection circuits for coil current limiting
and collector voltage clamping allows the
VB027ASP to be used as a smart, high voltage,
high current interface in advanced electronic
ignitionsystems.
BLOCK DIAGRAM
10
Power SO-10
1
TM
* Pins 1-5 = Power GND, Pin 6 signal GND. Pin 6 must be connected to pins 1-5 externally.
June 1999
1/8
VB027ASP
ABSOLUTEMAXIMUMRATING
Symbol Para met e r Val u e Uni t
HV
I
V
I
V
T
T
THERMALDATA
R
thj-case
R
thj-amb
CONNECTION DIAGRAM
Collec t or Voltage Int er na lly Limit ed V
C
Collec t or Current I nternally Limit ed A
C
Driving S t age Su ppl y Voltage 7 V
d
Driving C ir c uit r y Supply Current 200 mA
d
Maximum Input Volt a ge 10 V
in
Oper ating J unction Temperature -40 to 150
j
St orage Te mperatu re Range -55 to 150
stg
Ther mal Resis t an c e Junct ion Case(MAX ) 1.12
Ther mal Resis t an c e Junct ion Ambient(M AX ) 62.5
o
o
o
C/W
o
C/W
C
C
PIN FUNCTION
No NAME FUNCTIO N
1 - 5 GND Emit ter P ow er G round
6 ( *) GND Contr ol G round
7 Vd Supply Voltage F or The P ower Stage
TAB HV
C
9 INP UT
10 DIA G N O S TIC Out put o f a Logic Sig nal When Ic Is Gr eat e r T han 3 A
(*) PIN 6 must be connected to PINS 1- 5 externally
2/8
Output to The Primary Coil
VB027ASP
ELECTRICAL CHARACTERISTICS (Vb=13.5 V; Vd= 5 V; Tj=25oC; R
= 7 mH; unlessotherwisespecified)
L
coil
=510 mΩ;
coil
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
cl
V
cl
V
ce(sat)
V
ce(sat)
I
d(stdby)
I
d(ugnd)
High Voltage Clamp
High Voltage Clamp I
Saturation Voltage of
The Pow er Stage
Saturation Voltage of
The Pow er Stage
o
C ≤ Tj≤ 125oCI
-40
= 7 A 325 345 365 V
coil
Ic=7A; Vin=4V
o
C ≤ Tj≤ 125oC
-40
Ic=6A; Vin=4V
o
C ≤ Tj≤ 125oC
-40
coil
=7A
St and - by Supply C u rr ent Vin=0.4 11 mA
St and - by Supply
Curren t Dur ing
Vin=0.4V Ic=-4.5A
o
C ≤ Tj≤ 125oC
-40
300 400 V
3V
2V
160 mA
Underground
I
d(on)
I
d(on)
V
Power On Supply
Current
Power On Supply
Current
Driver Stage Supply
d
Vin=4V Ic=6A
o
C ≤ Tj≤ 125oC
-40
Vin=4V Ic=7A
o
C ≤ Tj≤ 125oC
-40
4.5 5.5 V
130 mA
160 mA
Voltage
Coil C ur rent Limit Vin=4V 8.5 10 A
cl
Coil C ur rent Limit Drif t
See figure 3
I
cl(td)
I
Wit h Temperature
I
leak
Collec t or Lea k a ge
VC= 1 25V 100 µA
Current
V
V
I
inH
V
diagH
V
diagL
I
diagTH1
High Le v el I nput Volt a ge 4 5.5 V
inH
Low Le v e l Input Volt ag e 0 0.8 V
inL
High Le v el I nput Current 200 µA
High Le v el Diagnost ic
Output Voltage
Low Le v e l Dia gno s t i c
Output Voltage
Diagno st i c Cur rent Fir st
=15KΩ C
R
EXT
(see fig. 1 )
=15KΩ C
R
EXT
(see fig. 1 )
EXT
EXT
=1nF
=1nF
3.5 V
4.25 4.5 4.75 A
d
0.5 V
Threshold
I
diagTD1
Diagno st i c Cur rent Fir st
See figure 4
Threshold Drift Wi th
Tem p er at u re
I
diagTH2
Diagno st i c Cur rent
5.45 5.8 6.15 A
Second Thr eshold
I
diagTD2
Diagno st i c Cur rent
See figure 5
Second Thr eshold Drift
Wit h Temperature
I
diagH
Ov ertemp erature
22.63.2A
Diagno st i c Cur rent
t
t
E
T
Delay Ti me C oil Current Ic=7A 5 25 45 µs
dlc
Fall Time Coil Current Ic=7A 2 8 15 µs
flc
Inductiv e E ner g y VCL=400V Ic=7A L=8mH 300 mJ
s/b
Tem p er at u re of
int
130 150 170
Diagno st i c S h if t
T
V
Thermal Hysteresis 30
hys
For ward Volt age of Th e
F
Ic= -10 A 1.2 2.2 3.2 V
Body Diode
V
o
C
o
C
3/8
VB027ASP
PRINCIPLEOF OPERATION
The VB027ASP is mainly intended as a high
voltage power switch device driven by a logic
levelinputand interfaces directly to a high energy
electronicignitioncoil.
The input Vin of the VB027ASPis fed from a low
power signal generated by an external controller
that determinesboth dwelltime and ignition point.
During Vin high (≥ 4V) the VB027ASP increases
current in the coil to the desired, internally set
currentlevel.
After reaching this level, the coil current remains
constant until the ignition point, that corresponds
to the transition of Vin from high to low (typ. 1.9V
threshold).
During the coil current switch-off, the primary
voltage HVc is clamped at an internally set value
Vcl, typically345V.
The transition from saturation to desaturation,coil
current limiting phase, must have the ability to
accomodate an overvoltage. A maximum
overshootof 20V isallowed.
THERMAL BEHAVIOUR
You can see in the block diagram of the
VB027ASP a box called overtemperature
protection. The purpose of this circuit is to shift
the current level at witch the 1st diagnostic is
activateddown of about2.5A.
This information can be managed by the micro
that can take the corrective actions in order to
reducethe powerdissipation.
This block is not an effective protection but just
an overtemperature detection. The shift down of
the 1st flag level cannot be present for
temperatureslower than 125
o
C.
As an example of its behaviour 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
deviceafter the 1st flag threshold.
EXAMPLE:
Iflag info after X msec. (Iflag= 4.5A)
Iswitchoff after K*X msec.
As soon as the temperature rises over the
overtemp. threshold, the 1st diagnostic is shifted
down to about 2.5A and in this example, the
switch off current will be K*X*2.5/4.5 helping the
systemto reduce the power dissipation.
As you can see this behaviouris not a protection
butjust a feedbackfor the micro.
FEEDBACK
When the collector current exceeds 4.5A, the
feedback signal is turned high and it remains so,
until the load current reaches 5.8A (second
threshold), at that value, the feedback signal is
turnedlow.
OVERVOLTAGE
The VB027BSP can withstand the following
transientsof the battery line:
-100V/2msec(R
+100V/0.2msec(R
+50V/400msec(R
=10Ω)
i
=10Ω)
i
=4.2 Ω, withVIN=3V)
i
4/8
FIGURE1: ApplicationCircuit
VB027ASP
FIGURE2: SwitchingWaveforms
5/8
VB027ASP
FIGURE3: MaximumIclVersusTemperature
FIGURE5: I
VersusTemperature
flag2
FIGURE4: I
VersusTemperature
flag1
6/8
PowerSO-10 MECHANICALDATA
VB027ASP
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 1.27 0.050
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 0.300
E3 6.10 6.35 0.240 0.250
E4 5.90 6.10 0.232 0.240
F 1.25 1.35 0.049 0.053
h 0.50 0.002
H 13.80 14.40 0.543 0.567
L 1.20 1.80 0.047 0.071
q 1.70 0.067
α 0
o
o
8
==
==
HE
h
A
F
A1
610
51
eB
M
0.25
D
==
D1
==
E2
==
DETAIL”A”
DETAIL”A”
Q
B
0.10 A
E1E3
==
SEATING
PLANE
A
C
α
B
E4
==
SEATING
PLANE
A1
L
==
0068039-C
7/8
VB027ASP
Information furnished is believed to beaccurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise underany patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject tochange without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a trademark of STMicroelectronics
1999 STMicroelectronics – Printed in Italy – All Rights Reserved
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