VB024 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'VB024' PDF : 8 Pages View PDF
VB024
ELECTRICAL CHARACTERISTICS (Vb = 12 V; Vs = 5 V Regulated; Tj = 25 oC; Rcoil = 500 mΩ;
Lcoil = 6mH unless otherwise specified)
Symb ol
Parameter
Vcl
High Voltage Clamp
Test Conditions
Vin = 0.4 V -40oC ≤ Tj ≤ 125 oC
Vce(sat) Saturation Voltage of
The Power Stage
Ic = 6A; Id = 80 mA; Vin = 4V
Is(on)
Control Circuit Supply
Current
Vs
Control Circuit Supply
Voltage
Id(on)
Driver Stage Stand-by
Current
Vin = 4 V
Vd
Driver Stage Supply
Voltage
Idiag
Diagnostic Current at
-40oC ≤ Tj ≤ 125 oC
Wich The Flag Switches
VinH High Level Input Voltage
VinL Low Level Input Voltage
IinH High Level Input Current Vin = 5.5 V
Vpos Positive Threshold
Vneg Negative Threshold
Vhys
Ic (max)
toff
VdiagH
VdiagL
Hysteresis Voltage
Turn-Off Current
Switch-Off Time
High Level Diagnostic
Output Voltage
Low Level Diagnostic
Output Volatge
Vin = 4 V -40oC ≤ Tj ≤ 125 oC
Ic = 6 A (see note 1)
Rflag = 20 KΩ
Rflag = 100 KΩ
Note 1: Time fron input swi tching Vne g unti l VCL dr ops to 200 V
Min.
320
Typ.
M ax .
510
2
Unit
V
V
15
mA
4.5
5.5
V
180 mA
5.5
16
V
2.75
3.35 mA
4
5.5
V
0
0.2
V
20
600
µA
2.8
3.2
V
1.3
1.7
V
1.3
1.7
V
7.3
8.8
A
10
80
µs
4
4.5
V
0.1
V
PRINCIPLE OF OPERATION
The VB024 is designed to drive the primary side
of an ignition coil and provide a logic signal
output to indicate a predetermined coil current
level. This output signal is used to perform dwell
control. This part is intended for use in Engine
Control Modules. It could also be used in an
ignition module or integrated into an ignition coil
assembly.
The VB024 accepts an input High signal from the
control IC to start charging the primary side of the
ignition coil. When the primary coil current
reaches 3 amps, the VB024 outputs a logic High
signal to the control IC. This flag signal is used in
the calculation of the dwell time.
This device also has a maximum primary coil
current Ic(max) Shut-off feature. Ic(max) equals
aproximately 1.5 times the nominal primary coil
currnet. If the Ic reaches Ic(max), the output stage
will Shut-off causing the spark to occour.
The VB024 is also internally clamped to protect it
from the flyback voltage of the primary
inductance as the output stage is turned off.
OVERVOLTAGE
The VB024 withstand the following transient test
performed using a ”Schaffner” equipment at TA =
80 oC:
1) LOAD DUMP
Ten pulses with 10 second intervals between
each transient. The device withstand load dump
while fully on, fully off and during the transition
between states (see figures 3 and 4).
2) NEGATIVE TRANSIENTS
Ten negative transients with 10 second intervals
between each transient (see figure 5).
3) REVERSE BATTERY
Inversion of battery voltage for a time = 60 sec
(see figure 5).
3/8
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