L584

November 1988

MULTIFUNCTION INJECTION INTERFACE

PRELI MINARY DATA

.

DRIVES ONE OR TWO EXTERNAL DAR-

LINGTONS

.

DUAL AND SINGLE LEVEL CURRENT CON-

TROL

.

SWITCHMODE CURRENT REGULATION

.

ADJUSTABLE HIGH LEVEL CURRENT DURA-

TION

.

WIDE SUPPLY RANGE (4.75 - 46V)

.

TTL-COMPATIBLE LOGIC INPUTS

.

THERMAL PROTECTION

.

DUMP PROTECTION

DESCRIPTION

The L584 is designed to drive injector solenoids in

electronic fuel injection systems and generally in-

ductive loads for automotive applications. The de-

vice is controlled by two logic inputs and features

switchmode regulation of the load current driving an

external darlington and an auxiliary one for the cur-

rent recirculation. A key feature of the L584 is flexi-

bility. It can be used with a variety of darlingtons to

match the requirements of the load and it allows

both simple and two level current control. Moreover,

DIP1 6 (12+ 2+ 2)

ORDERING NUMBER : L584

the drive waveshape can be adjusted by external

components. Other features of the device include

dump protection, thermal shutdown, a supply vol-

tage range of 4.75 - 46V and TTL-compatible inputs.

The L584 is suppliedin a 16 lead Powerdip package

which uses the four center pins to conduct heat to

the PC board copper.

BLOCK DIAGRAM

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