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L584
MULTIFUNCTION INJECTION INTERFACE
L584November 1988
MULTIFUNCTION INJECTION INTERFACE
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
DESCRIPTIONThe 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,
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 supplied in a 16 lead Powerdip package
which uses the four center pins to conduct heat to
the PC board copper.
BLOCK DIAGRAM1/13
THERMAL DATA
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION * Obtained with the GND pins soldered to printed circuit with minimized copper area.
L5842/13
PIN FUNCTIONSL584
3/13
ELECTRICAL CHARACTERISTICS (Vs (Pin 14) = 14.4V; –40 ≤ Tj ≤ 105°C; Rref = 1.20KΩ unless
otherwise specified; refer to fig. 1)
L5844/13
Figure 1 : Components Connected to Pins 6 and 7 Determine the Load Current Waveshape.
APPLICATION INFORMATIONControlled by a logic input and an inhibit input (both
TTL compatible), the device drives the external dar-
lington(s) to produce a load current waveform as
shown in figure 4. This basic waveform shows that
the device produces an initial high level current in or-
der to ensure a fast opening, followed by a holding
level current as long as the input is active. Both
the peak and holding current are regulated by the
L584’s switchmode circuitry.
The duration of the high level current and the values
of the peak and the holding currents can be adjusted
by external components.
Moreover, by omitting C1, C2 or both it is possible
to realize single-level current control, a transitory
peak followed by a regulated holding current or a
simple peak (figure 1).
The peak and holding current values are always re-
L5845/13
