LM384 [NSC]
5W Audio Power Amplifier; 5W音频功率放大器
| 型号： | LM384 |
| 厂家： | 
National Semiconductor |
| 描述： | 5W Audio Power Amplifier |
| 文件： | 总7页 (文件大小：156K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 1995
LM384
5W Audio Power Amplifier
General Description
Features
n Wide supply voltage range
n Low quiescent power drain
n Voltage gain fixed at 50
n High peak current capability
n Input referenced to GND
n High input impedance
n Low distortion
The LM384 is a power audio amplifier for consumer applica-
tion. In order to hold system cost to a minimum, gain is inter-
nally fixed at 34 dB. A unique input stage allows inputs to be
ground referenced. The output is automatically
self-centering to one half the supply voltage.
The output is short-circuit proof with internal thermal limiting.
The package outline is standard dual-in-line. A copper lead
frame is used with the center three pins on either side com-
prising a heat sink. This makes the device easy to use in
standard p-c layout.
n Quiescent output voltage is at one half of the supply
voltage
n Standard dual-in-line package
Uses include simple phonograph amplifiers, intercoms, line
drivers, teaching machine outputs, alarms, ultrasonic driv-
ers, TV sound systems, AM-FM radio, sound projector sys-
tems, etc. See AN-69 for circuit details.
Schematic Diagram
DS007843-3
© 1999 National Semiconductor Corporation
DS007843
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Temperature
0˚C to +70˚C
260˚C
Lead Temperature
(Soldering, 10 sec.)
Thermal Resistance
θJC
30˚C/W
79˚C/W
Supply Voltage
28V
1.3A
θJA
Peak Current
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur. Operating Ratings indicate conditions for which the de-
vice is functional, but do not guarantee specific performance limits.
Power Dissipation (See (Notes 4, 5))
Input Voltage
1.67W
±
0.5V
−65˚C to +150˚C
Storage Temperature
Electrical Characteristics (Note 2)
Symbol
ZIN
IBIAS
AV
POUT
IQ
Parameter
Conditions
Min
Typ
150
100
50
Max
Units
kΩ
nA
V/V
W
Input Resistance
Bias Current
Inputs Floating
Gain
40
5
60
25
=
=
Output Power
THD 10%, RL 8Ω
5.5
8.5
11
Quiescent Supply Current
Quiescent Output Voltage
Bandwidth
mA
V
VOUT Q
=
=
BW
V+
POUT 2W, RL 8Ω
450
kHz
V
Supply Voltage
12
26
ISC
Short Circuit Current (Note 6)
Power Supply Rejection Ratio
(Note 3) )
1.3
31
A
PSRRRTO
dB
=
=
THD
Total Harmonic Distortion
POUT 4W, RL 8Ω
0.25
1.0
%
+
=
=
25˚C operating with a Staver V7 heat sink for 30 seconds.
Note 2:
V
22V and T
A
=
=
Note 3: Rejection ratio referred to the output with C
5 µF, freq 120 Hz.
BYPASS
Note 4: The maximum junction temperature of the LM384 is 150˚C.
Note 5: The package is to be derated at 15˚C/W junction to heat sink pins.
Note 6: Output is fully protected against a shorted speaker condition at all voltages up to 22V.
Heat Sink Dimensions
Staver “V7” Heat Sink
DS007843-4
Staver Company
41 Saxon Ave.
P.O. Drawer H
Bay Shore, N.Y.
Tel: (516) 666-8000
www.national.com
2
Typical Performance Characteristics
Device Dissipation vs
Ambient Temperature
Thermal Resistance vs
Square Inches
Supply Decoupling vs
Frequency
DS007843-12
DS007843-10
DS007843-11
Total Harmonic Distortion
vs Output Power
Output Voltage Gain vs
Frequency
Total Harmonic Distortion
vs Frequency
DS007843-13
DS007843-15
DS007843-14
Power Supply Current vs
Supply Voltage
Device Dissipation vs
Output Power — 16Ω Load
Device Dissipation vs
Output Power — 8Ω Load
DS007843-16
DS007843-18
DS007843-17
3
www.national.com
Typical Performance Characteristics (Continued)
Device Dissipation vs
Output Power — 4Ω Load
DS007843-19
Block and Connection Diagrams
Dual-In-Line Package
DS007843-1
DS007843-2
Note 7: Heatsink Pins
Top View
Order Number LM384N
See NS Package Number N14A
www.national.com
4
Typical Applications
Typical 5W Amplifier
DS007843-6
Bridge Amplifier
DS007843-7
Intercom
DS007843-8
*For stability with high current loads
5
www.national.com
Typical Applications (Continued)
Phase Shift Oscillator
DS007843-9
www.national.com
6
Physical Dimensions inches (millimeters) unless otherwise noted
Molded Dual-In-Line Package (N)
Order Number LM384N
NS Package Number N14A
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