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LM1949 Datasheet

  • LM1949

  • LM1949 Injector Drive Controller

  • 10頁

  • NSC

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LM1949 Injector Drive Controller
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
鈥樷€榩eak鈥欌€?injector current is four times that of the idle or 鈥樷€榟old-
ing鈥欌€?current
(Figure 3鈥揊igure 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
g
10% supply the IC is typi-
cally operable over the entire temperature range (
b
55 C to
a
125 C ambient) with supplies as low as 3 volts This is
particularly useful under 鈥樷€榗old crank鈥欌€?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
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Low voltage supply (3V 鈥?5 5V)
22 mA output drive current
No RFI radiation
Adaptable to all injector current levels
Highly accurate operation
TTL CMOS compatible input logic levels
Short circuit protection
High impedance input
Externally set holding current I
H
Internally set peak current (4
c
I
H
)
Externally set time-out
Can be modified for full switching operation
Available in plastic 8-pin miniDIP
Applications
Y
Y
Y
Y
Y
Fuel injection
Throttle body injection
Solenoid controls
Air and fluid valves
DC motor drives
Typical Application Circuit
TL H 5062 鈥?1
FIGURE 1 Typical Application and Test Circuit
Order Number LM1949M or LM1949N
See NS Package Number M08A or N08E
COPS
TM
is a trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL H 5062
RRD-B30M115 Printed in U S A

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