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PDF L584 Data sheet ( Hoja de datos )

Número de pieza L584
Descripción MULTIFUNCTION INJECTION INTERFACE
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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No Preview Available ! L584 Hoja de datos, Descripción, Manual

L584
MULTIFUNCTION INJECTION INTERFACE
. 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
PRELIMINARY DATA
DIP16 (12 + 2 + 2)
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
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 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
1/13

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L584 pdf
L584
APPLICATION INFORMATION
Controlled 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-
Figure 1 : Components Connected to Pins 6 and 7 Determine the Load Current Waveshape.
COMPONENTS ON PINS 6 AND 7
LOAD CURRENT WAVEFORM
5/13

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L584 arduino
Figure 9 : Application circuit showing how two separate supplies can be used.
L584
In this application it is assumed that the 5V supply
for L584 is taken from a logic supply, which is al-
ready protected, against load dump transients and
vol-tage reversal.
Pin 1 must be left
alwaLys lower than
open, as
46V even
shown in fig. 9, if VS is
during the voltage tran-
sienRts.
Note that toff is also related to the required current
ripple I on the peak or on the holding current level
by :
toff = –
ln (Io I) RL + Voff
Io RL + Voff
Where : Io is the initial current valuein OFF condition
(equal to Ip or IH in accordance to the current level
considered),
VOFF = VDIODE + VCEQ1
RL is the series resistance value of the induc-
tance L :
Therefore C2 can be dimensioned directly by :
C2 =
IREF L
12
ln (Io I) RL + VOFF
RL Io RL + VOFF
Note that toff is the same for both the peak and hold-
ing current.
ton time is given by :
L Von – R(I1 – I)
ton = R ln Von – RI1
where : I1 is the final current value in ON condition
(equal to Ip or IH in accordance to the current level
considered),
R = RL + RSENSE
Von = VS – VCEsatQ2
If the constant times are respectively
LL
R > 20 toff and R > 20 ton
it is possible to consider a purely inductive load and
therefore :
I I
toff = L Vo ; ton = L Von
11/13

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