VB025SP
HIGH VOLTAGE IGNITION COIL DRIVER
POWER IC
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
SINGLE FLAG-ON COIL CURRENT
DESCRIPTION
The VB025SP is a high voltage power integrated
circuit made using STMicroelectronics VIPower
Technology, with vertical current flow power
darlington and logic level compatible driving circuit.
Built-in protection circuits for coil current limiting
and collector voltage clamping allows the
VB025SP to be used as a smart, high voltage,
high current interface in advanced electronic
ignition systems.
March 1999
BLOCK DIAGRAM
TYPE
V
c l
I
cl
I
d
VB025SP
380 V
9 A
100 mA
1
10
PowerSO-10
1/7
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
Unit
HV
C
Collector Voltage (Internally Limited)
-0.3 to V
clamp
V
I
C
Collector Current (Internally Limited)
10
A
I
C(gn d)
DC Current on Emitter Power
10.5 (
)
A
V
CC
Driving Stage Supply Voltage
-0.3 to 7
V
I
s
Driving Circuitry Supply Current
200
mA
I
s(gnd )
DC Current on Ground Pin
1
A
V
in
Input Voltage
-0.3 to VCC + 0.3
V
I
in
Maximum Input Current
100
mA
f
in
Logic Input Frequency in Operative Mode
DC to 150
Hz
V
out(flag)
Output Voltage Primary Threshold Current Level
-0.3 to VCC + 0.3
V
I
out(flag)
Flag Output Current
100
mA
P
max
Power Dissipation (TC = 105
o
C)
TBD
W
E
s/b
Clamped Energy During Output Power Clamping
300
mJ
V
ESD
ESD Voltage (HVC Pin)
4
KV
V
ESD
ESD Voltage (Other Pins)
2
KV
I
BD
Input Darlington Base Current
150
mA
V
BD
Input Darlington Base Voltage
Internally Limited
V
T
j
Operating Junction Temperature
-40 to 150
o
C
T
stg
Storage Temperature Range
-55 to 150
o
C
(
) With 10 mils Al wire
THERMAL DATA
R
thj-case
Thermal Resistance Junction Case (MAX)
1.2
o
C/W
R
thj-h
Thermal Resistance Junction Heatsink with FR4 (MAX)
TBD (
@
)
o
C/W
T
sold
Lead Temperature During Soldering (MAX)
TBD (
@
)
o
C
(
@
) see application note AN515/1094 on VIPower data-book 1
st
edition.
VB025SP
2/7
CONNECTION DIAGRAM
PIN FUNCTION
No
NAME
FUNCTION
1-5
GND
Emitter Power Ground
6
GND
Control Ground (*)
7
V
CC
Logic Supply Voltage
8
BD
Base Darlington
9
INPUT
Logic Input Channel (Internal Pull Down)
10
FLAG
Diagnostic Output Signal (Open Emitter)
TAB
HVC
Primary Coil Output Driver (Open Collector)
(*) Pin 6 must be connected to pins 1-5 externally
ELECTRICAL CHARACTERISTICS (5.3V < V
b
< 24V; V
CC
= 5 V
10%; -40
o
C < T
j
< 125
o
C;
R
coil
= 580 m
; L
coil
= 3.75 mH; unless otherwise specified; see note 1)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
cl
High Voltage Clamp
I
co il
= 6.5 A
320
380
420
V
V
ce (sat)
Saturation Voltage of The
Power Stage
I
c
= 6.5A; V
in
= 4V
1.5
2
V
I
CC(stdb y)
Stand-by Supply Current
IN = OFF
10
mA
I
CC
DC Logic Current
V
b
= 16 V I
c
= 6.5 A f = 100 Hz
Load = Coil V
CC
= 5.5V
40
mA
I
CC(pe ak)
Peak DC Logic Current
During On Phase
I
c
= 6.5 A (see figure 1)
100
150
mA
V
CC
DC Logic Voltage
4.5
5.5
V
I
cl
Coil Current Limit
-40
o
C < T
j
< 125
o
C
(see note 2 and figure 1)
8.25
10
A
I
c(leak)
Output leakage Current
IN = OFF V
HVC
= 24V
0.8
mA
I
C(infl)
Collector Current with
Floating Input
VCC = 5 V VBat = 13.5 V
R
LOAD
= 1K
; Input Floating
0.8
mA
T
Ic_ctr
Thermal Temperature
Output Current Control
OUT = ON (see figure 2)
150
(*)
o
C
VB025SP
3/7
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
inH
High Level Input Voltage
V
CC
= 4.5V
4
V
CC
V
V
inL
Low Level Input Voltage
V
CC
= 5.5V
-0.3
0.8
V
V
in(h ys)
Input Threshold
Hysteresis
0.4
V
I
inH
High Level Input Current
V
in
= 4 V
100
A
I
inL
Low Level Input Current
V
in
= 0.8 V
-100
A
I
inpd
Input Active Pull-Down
V
in
= 4 V
10
100
A
V
diagH
High Level Flag Output
Voltage
R
EXT
= 22 K
C
EXT
= 1 nF
(see note 3)
V
CC
-1
V
CC
V
V
diagL
Low Level Flag Output
Voltage
R
EXT
= 22 K
C
EXT
= 1 nF
(see note 3)
0.5
V
I
d iagTH
Coil Current Level
Threshold
T
j
= 25
o
C (see figure 1)
4.25
4.5
4.75
A
I
d iagTD
Coil Current Level
Threshold Drift
(see figure 3)
I
d iag
High Level Flag Output
Current
I
C
> I
diagTH
V
diag
= 3 V
0.5
TBD
mA
I
dia g(leak)
Leakage Current On Flag
Output
V
in
= LOW V
CC
= 5.5V
10
A
V
F
Antiparallel Diode
Forward Voltage
I
c
= -1 A
2
V
E
s/b
Single Pulse Avalanche
Energy
L = 6 mH I
C
= 8 A
(see figure 4)
180
mJ
t
pHL
Turn-on Delay Time of
Coil Current
R
c
= 0.5
L
c
= 3.75 mH
(see figure 5)
TBD
s
t
pLH
Turn-off Delay Time of
Coil Current
R
c
= 0.5
L
c
= 3.75 mH I
c
= 6.5 A
(see figure 5)
TBD
s
Note 1: Parametric degradation are allowed with 5.3 < V
b
< 10V and V
b
> 24V.
Note 2: The primary coil current value I
cl
must be measured 1ms after desaturation of the power stage.
Note 3: No Internal Pull-Down
(*) Internally limited
ELECTRICAL CHARACTERISTICS (continued)
PRINCIPLE OF OPERATION
The VB025SP is mainly intended as a high
voltage power switch device driven by a logic
level input and interfaces directly to a high energy
electronic ignition coil.
The input Vin of the VB025SP is fed from a low
power signal generated by an external controller
that determines both dwell time and ignition point.
During Vin high (
4V) the VB025SP increases
current in the coil to the desired, internally set
current level.
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, typically 380V.
The transition from saturation to desaturation, coil
current limiting phase, must have the ability to
accomodate an overvoltage. A maximum
overshoot of 20V is allowed.
FEEDBACK
When the collector current exceeds 4.5A, the
feedback signal is turned high and it remains so,
until the input voltage is turned-off.
OVERVOLTAGE
The VB025SP can withstand the following
transients of the battery line:
-100V/2msec (R
i
= 10
)
+100V/0.2msec (R
i
= 10
)
+50V/400msec (R
i
= 4.2
, with V
IN
= 3 V)
VB025SP
4/7
FIG. 4 Single Pulse Typical Es/b Curve
Fig. 3 Flag Current Versus Temperature
FIG. 5 Propagation Times Definitions.
10 %
50 %
10 %
200 V
t
t
pHL
pLH
INPUT
HVC
SC10930
Fig. 1 Main Waveforms During On Phase
Fig. 2 Output Current Waveform After Thermal
Protection Activation
VB025SP
5/7
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