January 2003
1/5
VB927T
HIGH VOLTAGE IGNITION COIL DRIVER
POWER I.C.
s
NO EXTERNAL COMPONENT REQUIRED
s
COIL CURRENT LIMIT INTERNALLY SET
s
INTEGRATED HIGH VOLTAGE CLAMP
s
HIGH RUGGEDNESS
s
OVERTEMPERATURE PROTECTION
DESCRIPTION
The VB927T is a monolithic high voltage integrated circuit
made by using the STMicroelectronics VIPowerTM
technology, which combines vertical current flow power
trilinton with a coil current and a collector voltage
clamping. The device is particularly suitable for
application in high performance electronic car ignition,
where coil current limitation and voltage clamping are
required.
TYPE
V
cl
I
cl
V
cg(sat)
VB927T
380V
9.5A
2.5V
BLOCK DIAGRAM
TO-247
1
2
3
REFERENCE
V
IN
HV
C
GND
DRIVER
OVERTEMP.
PROTECTION
INPUT
HYSTERESIS
R
SENSE
CURRENT
LIMITER
VOLTAGE
ORDER CODES
PACKAGE
TUBE
T&R
TO-247
VB927T
-
3/5
VB927T
THERMAL DATA
ELECTRICAL CHARACTERISTICS (V
CC
=14V; -40V < T
j
< 125C unless otherwise specified)
(*) Coil data: primary resistance R
C
=0.4 - 0.8
; primary inductance L
C
= 6 - 8 mH
(**) Pulsed: Pulse duration =300
s, duty cycle 1.5%
Note 1: T
jmin
=150C means that the behavior of the device will not be affected for junction temperature lower than 150C. For higher
temperature, the thermal protection circuit will begin its action reducing the I
cl
limit according with the power dissipation. Chip temperature is
a function of the R
th
of the whole system in which the device will be operating.
Symbol
Parameter
Value
Unit
R
thj-case
Thermal Resistance Junction-case
(MAX)
0.6
C/W
R
thj-amb
Thermal Resistance Junction-ambient
(MAX)
30
C/W
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
I
leak
Collector Cut-off Current
V
IN
=0V; HV
C
=250V 250
A
V
cl
(*)
Clamping Voltage
-40C <
T
j
<
125C
380
420
490
V
V
cg(sat)
Power Stage Saturation
Voltage
I
C
=5A; I
IN
=10mA; 25C
T
j
125C
I
C
=6A; I
IN
=10mA; -40C
T
j
25C
2.5
3
V
V
I
cl
(*)
Coil Current Limit
V
IN
=5V; -40C
T
j
125C
8.5
9.5
A
I
IN
Input Current
V
IN
=5V; I
C
=5A
V
IN
=5V; I
C
=5A; T
j
=25C
3
10
10
mA
mA
V
f
(**)
Diode Forward Voltage
I
f
=10A; T
j
=25C
1.2
2.2
3.2
V
V
INH
Input Voltage (ON)
On state input threshold
3.2
3.6
V
V
INL
Input Voltage (OFF)
Off state input threshold
3
3.4
V
V
IN(hyst)
Input Voltage (Hyst.)
0.2
0.6
V
t
d(off)
Turn-off Time
I
C
=5A
30
s
T
j
Junction Temperature Limit See note 1
150
C
5/5
VB927T
Information furnished is believed to be accurate 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 results from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are
subject to change 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
2003 STMicroelectronics - Printed in ITALY- All Rights Reserved.
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