®
VB325SP
HIGH VOLTAGE IGNITION COIL DRIVER
POWER I.C.
TYPE
VB325SP
s
V
cl
380V
I
cl
10A
I
CC
150mA
PRIMARY COIL VOLTAGE INTERNALLY SET
s
COIL CURRENT LIMIT INTERNALLY SET
s
LOGIC LEVEL COMPATIBLE INPUT
s
DRIVING CURRENT QUASI PROPORTIONAL
TO COLLECTOR CURRENT
s
SINGLE FLAG-ON COIL CURRENT
s
LOW VOLTAGE CLAMP THERMAL
SHUTDOWN
DESCRIPTION
The VB325SP is a high voltage power integrated
circuit made using the STMicroelectronics
VIPower™ M1-3 technology, with vertical current
flow power darlington and logic level compatible
driving circuit. The enable pin allows to externally
block the switch when the input is on. Built-in
protection circuit for coil current limiting and
collector voltage clamping allows the device to be
used as smart, high voltage, high current interface
BLOCK DIAGRAM
V
CC
10
1
PowerSO-10™
in advanced electronic ignition system. If the input
signal from the micro happens to remain high, the
device protects itself against over-heating by
forcing collector current to smooth decrease (low
voltage clamp feature) and no undesidered spark
occurs (see figure 4).
BD
HV
C
V
IN
DRIVER
QUASI PROP.
BASE CURRENT
DIAGNOSTIC
OUTPUT
V
R
LIMITER
R
SENSE
V
CC
V
F1
-
REFERENCE
V
LIM
V
TH
THERMAL
PROTECTION
SN
E
LGND
GND
November 2003
1/9
STMICROELECTRONICS [ STMICROELECTRONICS ]
