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LM1949N Datenblatt(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM1949N
Bauteilbeschribung  LM1949 Injector Drive Controller
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

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TLH5062
February 1995
LM1949 Injector Drive Controller
General Description
The LM1949 linear integrated circuit serves as an excellent
control of fuel injector drive circuitry in modern automotive
systems The IC is designed to control an external power
NPN Darlington transistor that drives the high current injec-
tor solenoid The current required to open a solenoid is sev-
eral times greater than the current necessary to merely hold
it open therefore the LM1949 by directly sensing the actu-
al solenoid current initially saturates the driver until the
‘‘peak’’ injector current is four times that of the idle or ‘‘hold-
ing’’ current
(Figure 3 – Figure 7) This guarantees opening
of the injector The current is then automatically reduced to
the sufficient holding level for the duration of the input
pulse In this way the total power consumed by the system
is dramatically reduced Also a higher degree of correlation
of fuel to the input voltage pulse (or duty cycle) is achieved
since opening and closing delays of the solenoid will be
reduced
Normally powered from a 5V g10% supply the IC is typi-
cally operable over the entire temperature range (b55 Cto
a
125 C ambient) with supplies as low as 3 volts This is
particularly useful under ‘‘cold crank’’ conditions when the
battery voltage may drop low enough to deregulate the
5-volt power supply
The LM1949 is available in the plastic miniDIP (contact fac-
tory for other package options)
Features
Y
Low voltage supply (3V – 55V)
Y
22 mA output drive current
Y
No RFI radiation
Y
Adaptable to all injector current levels
Y
Highly accurate operation
Y
TTLCMOS compatible input logic levels
Y
Short circuit protection
Y
High impedance input
Y
Externally set holding current IH
Y
Internally set peak current (4 c IH)
Y
Externally set time-out
Y
Can be modified for full switching operation
Y
Available in plastic 8-pin miniDIP
Applications
Y
Fuel injection
Y
Throttle body injection
Y
Solenoid controls
Y
Air and fluid valves
Y
DC motor drives
Typical Application Circuit
TLH5062 – 1
FIGURE 1 Typical Application and Test Circuit
Order Number LM1949M or LM1949N
See NS Package Number M08A or N08E
COPSTM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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