November 2003

1/9

®

VB325SP

HIGH VOLTAGE IGNITION COIL DRIVER

POWER I.C.

s

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

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).

TYPE

VB325SP

380V

10A

150mA

BLOCK DIAGRAM

PowerSO-10™

1

10

DRIVER

GND

REFERENCE

QUASI PROP.

BASE CURRENT

-

THERMAL

PROTECTION

BD

E

DIAGNOSTIC

OUTPUT

SN

LIMITER

LGND