L584
MULTIFUNCTION INJECTION INTERFACE
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PRELIMINARY 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
DIP16
(12 + 2 + 2)
ORDERING NUMBER :
L584
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,
BLOCK DIAGRAM
the drive waveshape can be adjusted by external
components. Other features of the device include
dump protection, thermal shutdown, a supply vol-
tage rangeof 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.
November 1988
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