VB025MSP STMicroelectronics, VB025MSP Datasheet - Page 4

• Manufacturer Part Number: VB025MSP
• Description: HIGH VOLTAGE IGNITION COIL DRIVER POWER IC
• Manufacturer: STMicroelectronics

VB025SP
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
4/7
ELECTRICAL CHARACTERISTICS (continued)
Note 1: Parametric degradation are allowed with 5.3 < V
Note 2: The primary coil current value I
Note 3: No Internal Pull-Down
(*) Internally limited
I
Symbol
diag(leak)
V
V
I
I
V
diagTH
diagTD
V
V
in(hys)
I
I
E
t
t
I
I
diagH
diagL
inpd
diag
V
pHL
pLH
inH
inL
inH
inL
s/b
F
High Level Input Voltage
Low Level Input Voltage
Input Threshold
Hysteresis
High Level Input Current
Low Level Input Current
Input Active Pull-Down
High Level Flag Output
Voltage
Low Level Flag Output
Voltage
Coil Current Level
Threshold
Coil Current Level
Threshold Drift
High Level Flag Output
Current
Leakage Current On Flag
Output
Antiparallel Diode
Forward Voltage
Single Pulse Avalanche
Energy
Turn-on Delay Time of
Coil Current
Turn-off Delay Time of
Coil Current
Parameter
cl
must be measured 1ms after desaturation of the power stage.
V
V
V
V
V
R
(see note 3)
R
(see note 3)
T
(see figure 3)
I
V
I
L = 6 mH
(see figure 4)
R
(see figure 5)
R
(see figure 5)
C
c
j
CC
CC
in
in
in
in
EXT
EXT
c
c
= -1 A
= 25
> I
b
= 0.5
= 0.5
= 4 V
= 0.8 V
= 4 V
= LOW
< 10V and V
= 4.5V
= 5.5V
diagTH
= 22 K
= 22 K
o
C
Test Conditions
L
L
I
c
c
b
C
> 24V.
= 3.75 mH
= 3.75 mH I
= 8 A
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
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
+100V/0.2msec (R
+50V/400msec (R
V
C
C
V
(see figure 1)
diag
EXT
EXT
CC
= 5.5V
= 3 V
= 1 nF
= 1 nF
c
= 6.5 A
an
i
= 10 )
i
i
= 4.2 , with V
= 10 )
overvoltage.
V
Min.
4.25
-0.3
180
0.4
0.5
CC
10
4
-1
Typ.
TBD
TBD
TBD
4.5
IN
A
= 3 V)
Max.
-100
4.75
V
100
100
V
0.8
0.5
10
2
CC
CC
maximum
Unit
mA
mJ
V
V
V
V
V
A
V
A
A
A
A
s
s