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VB025MSP Datasheet(PDF) 4 Page - STMicroelectronics

Part # VB025MSP
Description  HIGH VOLTAGE IGNITION COIL DRIVER POWER IC
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VB025MSP Datasheet(HTML) 4 Page - STMicroelectronics

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Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VinH
High Level Input Voltage
VCC = 4.5V
4
VCC
V
VinL
Low Level Input Voltage
VCC = 5.5V
-0.3
0.8
V
Vin(hys)
Input Threshold
Hysteresis
0.4
V
IinH
High Level Input Current
Vin = 4 V
100
µA
IinL
Low Level Input Current
Vin = 0.8 V
-100
µA
Iinpd
Input Active Pull-Down
Vin = 4 V
10
100
µA
VdiagH
High Level Flag Output
Voltage
REXT = 22 K
CEXT = 1 nF
(see note 3)
VCC-1
VCC
V
VdiagL
Low Level Flag Output
Voltage
REXT = 22 K
CEXT = 1 nF
(see note 3)
0.5
V
IdiagTH
Coil Current Level
Threshold
Tj = 25
o C
(see figure 1)
4.25
4.5
4.75
A
IdiagTD
Coil Current Level
Threshold Drift
(see figure 3)
Idiag
High Level Flag Output
Current
IC > IdiagTH
Vdiag = 3 V
0.5
TBD
mA
Idiag(leak)
Leakage Current On Flag
Output
Vin = LOW
VCC = 5.5V
10
µA
VF
Antiparallel Diode
Forward Voltage
Ic = -1 A
2
V
Es/b
Single Pulse Avalanche
Energy
L = 6 mH
IC = 8 A
(see figure 4)
180
mJ
tpHL
Turn-on Delay Time of
Coil Current
Rc = 0.5
Ω Lc = 3.75 mH
(see figure 5)
TBD
µs
tpLH
Turn-off Delay Time of
Coil Current
Rc = 0.5
Ω Lc = 3.75 mH Ic = 6.5 A
(see figure 5)
TBD
µs
Note 1: Parametric degradation are allowed with 5.3 < Vb < 10V and Vb > 24V.
Note 2: The primary coil current value Icl 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 (Ri = 10
Ω)
+100V/0.2msec (Ri = 10
Ω)
+50V/400msec (Ri = 4.2
Ω, with VIN = 3 V)
VB025SP
4/7


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