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® VB923
HIGH VOLTAGE IGNITION COIL DRIVER
POWER IC
s NO EXTERNAL COMPONENT REQUIRED
s INTEGRATED HIGH VOLTAGE CLAMP
s COIL CURRENT LIMIT INTERNALLY SET
s HIGH RUGGEDNESS
DESCRIPTION
The VB923 is a monolithic high voltage integrated
circuits made using STMicroelectronics VIPower
Technology, which combines a vertical current
flow power trilinton with a coil current limiting
circuit and a collector voltage clamping.
The device is peculiarly suitable for application in
high performance electronic car ignition, where
coil current limitation and voltage clamping are
required.
3
2
1
TO-247
BLOCK DIAGRAM
October 1998
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VB923
ABSOLUTE MAXIMUM RATING
Symbol
HVc
Ic
Iin
Ptot
Tstg
Tj
Es/b
Parameter
Collector Voltage
Collector Current
Input Current
Total Dissipation at Tc = 25 oC
Storage Temperature
Operating Junction Temperature
Avalanche Energy
Value
Internally Limited
Internally Limited
40
150
-40 to 150
-40 to150
350
Unit
V
A
mA
W
oC
oC
mJ
THERMAL DATA
Symbol
Rthj-case
Rthj-amb
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max
Max
Value
0.83
30
Unit
oC/W
oC/W
ELECTRICAL CHARACTERISTICS (Vbatt = 14 V, HEI Coil = xx, Tcase = 25 oC
unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
Icgo Collector Cut-off
Current
Vcl Clamping Voltage
Vin = 0 HVc = 200 V
-40 < Tj < 125 oC Ic = 5 A
250
350 400 500
µA
V
Vcg(sat)
Icl *
Power Stage
Saturation Voltage
Coil Current Limit
Ic = 5 A Vin = 4 V
-30 Tj 50 oC
2 2.5
6.0 6.6 7.2
V
A
Vf **
VinCL
VinTH
Diode Forward Voltage
Input Voltage During
On State
Threshold Input
Voltage
If = 10 A
-30 Tj 120 oC Ic = 5 A
Iin = 10 mA see note 1
-30 Tj 120 oC Ic = 5 A
see note 2
0.5
3.5 V
4V
4V
td(off) Switching Time
Ic = 3 A L = 6 mH (see fig.1)
15
40 µs
* ICL is measured 1ms after the maximum peak
** Pulsed: Pulse duration = 300 µs, duty cycle 1.5 %
Note 1: After adjusting input signal (frequency and duty) to be IC = 5A, Vin (Tr ON) should be measured.
Note 2: The device is biased with 14V on collector with respectto emitter. Then a voltage ramp (0 to 5V) is put on input. VinTH is the input
voltage when the device is in on-state with IC=5A
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Fig. 1 Switching Time
VB923
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VB923
DIM.
A
D
E
F
F3
F4
G
H
L
L3
L4
L5
M
Dia
MIN.
4.7
2.2
0.4
1
2
3
15.3
19.7
14.2
2
3.55
TO-247 MECHANICAL DATA
mm
TYP.
10.9
34.6
5.5
MAX.
5.3
2.6
0.8
1.4
2.4
3.4
15.9
20.3
14.8
3
3.65
MIN.
0.185
0.087
0.016
0.039
0.079
0.118
0.602
0.776
0.559
0.079
0.140
inch
TYP.
0.429
0.413
1.362
0.217
MAX.
0.209
0.102
0.031
0.055
0.094
0.134
0.626
0.779
0.582
0.118
0.144
P025P
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VB923
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 result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification 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 registered trademark of STMicroelectronics
© 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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