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參數(shù)資料
| 型號： | LM1949 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Injector Drive Controller(注入極驅(qū)動控制器) |
| 中文描述： | 噴油器驅(qū)動器控制器（注入極驅(qū)動控制器） |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 214K |
| 代理商： | LM1949 |
TL/H/5062
L
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
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 ‘‘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, I
H
Y
Internally set peak current (4
c
I
H
)
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
TL/H/5062–1
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
RRD-B30M115/Printed in U. S. A.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM1949M | LM1949 Injector Drive Controller |
| LM1949N | LM1949 Injector Drive Controller |
| LM20123 | 3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator |
| LM20123MH | 3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator |
| LM20123MHE | 3A, 1.5MHz PowerWise㈢ Synchronous Buck Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1949M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM1949 Injector Drive Controller |
| LM1949N | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LM1949N/NOPB | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LM1949N/NOPB | 制造商:Texas Instruments 功能描述:Power Driver IC |
| LM194C | 制造商:Texas Instruments 功能描述: |
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