LM1949N 반도체 회로 부품 판매점
LM1949 Injector Drive Controller
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 National Semiconductor |
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 C to
a125 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 – 5 5V)
Y 22 mA output drive current
Y No RFI radiation
Y Adaptable to all injector current levels
Y Highly accurate operation
Y TTL CMOS 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
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 TL H 5062
TL H 5062 – 1
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
8V
Power Dissipation (Note 1)
1235 mW
Input Voltage Range
Operating Temperature Range
Storage Temperature Range
Junction Temperature
Lead Temp (Soldering 10 sec )
b0 3V to VCC
b40 C to a125 C
b65 C to a150 C
150 C
260 C
Electrical Characteristics (VCCe5 5V VINe2 4V Tje25 C Figure 1 unless otherwise specified )
Symbol
Parameter
Conditions
Min Typ Max Units
ICC Supply Current
Off
Peak
Hold
VIN e 0V
Pin 8 e 0V
Pin 8 Open
11 23 mA
28 54 mA
16 26 mA
VOH
VOL
IB
IOP
Input On Level
Input Off Level
Input Current
Output Current
Peak
Hold
VCC e 5 5V
VCC e 3 0V
VCC e 5 5V
VCC e 3 0V
Pin 8 e 0V
Pin 8 Open
10
07
b25
b10
b1 5
14
12
1 35
1 15
3
b22
b5
24
16
a25
V
V
V
V
mA
mA
mA
VS
Output Saturation Voltage
10 mA VIN e 0V
02 04
V
Sense Input
Vp
Peak Threshold
VCC e 4 75V
350 386 415
mV
VH Hold Reference
88 94 102 mV
t Time-out t
tdRTCT
90 100 110 %
NOTE 1 For operation in ambient temperatures above 25 C the device must be derated based on a 150 C maximum junction temperature and a thermal
resistance of 100 C W junction to ambient
Typical Circuit Waveforms
TL H 5062 – 2
2
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