LM390N [NSC]

LM390 1W Battery Operated Audio Power Amplifier; LM390 1W电池供电音频功率放大器
LM390N
型号: LM390N
厂家: National Semiconductor    National Semiconductor
描述:

LM390 1W Battery Operated Audio Power Amplifier
LM390 1W电池供电音频功率放大器

电池 放大器 功率放大器
文件: 总6页 (文件大小:165K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
April 1995  
LM390 1W Battery Operated Audio Power Amplifier  
Y
Self-centering output quiescent voltage  
General Description  
The LM390 Power Audio Amplifier is optimized for 6V, 7.5V,  
9V operation into low impedance loads. The gain is internal-  
ly set at 20 to keep the external part count low, but the  
addition of an external resistor and capacitor between pins  
2 and 6 wil increase the gain to any value up to 200. The  
Y
Variable voltage gain  
Y
Low distortion  
Y
Fourteen pin dual-in-line package  
Applications  
Y
AM-FM radio amplifiers  
Portable tape player amplifiers  
Intercoms  
inputs are ground referenced while the output is automati-  
cally biased to one half the supply voltage.  
Y
Y
Y
Y
Y
Y
Y
Y
Features  
Y
TV sound systems  
Lamp drivers  
Battery operation  
Y
1W output power  
Line drivers  
Y
Minimum external parts  
Ultrasonic drivers  
Small servo drivers  
Power converters  
Y
Excellent supply rejection  
Y
Ground referenced input  
Equivalent Schematic and Connection Diagrams  
Dual-In-Line Package  
TL/H/7848–2  
Order Number LM390N  
See NS Package Number N14A  
TL/H/7848–1  
C
1995 National Semiconductor Corporation  
TL/H/7848  
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.  
a
0 C to 70 C  
Operating Temperature  
§
§
Junction Temperature  
150 C  
§
Lead Temperature (Soldering, 10 sec.)  
Thermal Resistance  
260 C  
§
Supply Voltage  
10V  
Package Dissipation 14-Pin DIP (Note 1)  
Input Voltage  
8.3W  
i
i
30 C/W  
§
JC  
g
0.4V  
79 C/W  
§
JA  
b
a
65 C to 150 C  
Storage Temperature  
§
§
e
Electrical Characteristics T  
25 C,(Figure 1)  
§
A
Symbol  
Parameter  
Operating Supply Voltage  
Quiescent Current  
Output Power  
Conditions  
Min  
Typ  
Max  
9
Units  
V
V
S
4
e
e
e
e
I
V
6V, V  
IN  
0
10  
20  
mA  
W
Q
S
S
S
e
L
e
P
V
6V, R  
4X, THD  
10%  
0.8  
23  
1.0  
OUT  
e
A
V
Voltage Gain  
V
6V, f  
1 kHz  
26  
46  
30  
1
dB  
dB  
10 mF from Pin 2 to 6  
e
e
e
BW  
Bandwidth  
V
S
6V, Pins 2 and 6 Open  
300  
0.2  
kHz  
%
e
e
500 mW  
THD  
Total Harmonic Distortion  
V
S
6V, R  
4X, P  
L
OUT  
f
1 kHz, Pins 2 and 6 Open  
e
e
e
1 kHz, C 10 mF,  
BYPASS  
PSRR  
Power Supply Rejection Ratio  
V
S
6V, f  
Pins 2 and 6 Open, Referred to Output  
(Note 2)  
50  
dB  
R
Input Resistance  
Input Bias Current  
10  
50  
kX  
IN  
e
V
S
I
6V, Pins 7 and 8 Open  
250  
nA  
BIAS  
Note 1: Pins 3, 4, 5, 10, 11, 12 at 25 C. Above 25 C case, derate at 15 C/W junction to case, or 85 C/W junction to ambient.  
§
§
§
Note 2: If load and bypass capacitor are returned to V (Figure 2), rather than ground (Figure 1), PSRR is typically 30 dB.  
§
S
Typical Performance Characteristics  
Power Supply Rejection Ratio  
(Referred to the Output) vs  
Frequency  
Maximum Device Dissipation  
vs Ambient Temperature  
Quiescent Supply Current vs  
Supply Voltage  
TL/H/7848–5  
2
Typical Performance Characteristics (Continued)  
Device Dissipation vs  
Output Power 4X Load  
Device Dissipation vs  
Output Power 8X Load  
Distortion vs Output Power  
TL/H/7848–6  
Application Hints  
Gain Control  
bypass the unused input, preventing degradation of gain  
and possible instabilities. This is done with a 0.1 mF capaci-  
tor or a short to ground depending on the dc source resist-  
ance on the driven input.  
To make the LM390 a more versatile amplifier, two pins (2  
and 6) are provided for gain control. With pins 2 and 6 open,  
the 1.35 kX resistor sets the gain at 20 (26 dB). If a capaci-  
tor is put from pin 2 to 6, bypassing the 1.35 kX resistor, the  
gain will go up to 200 (46 dB). If a resistor is placed in series  
with the capacitor, the gain can be set to any value from 20  
to 200. A low frequency pole in the gain response is caused  
by the capacitor working against the external resistor in se-  
ries with the 150X internal resistor. If the capacitor is elimi-  
nated and a resistor connects pin 2 to 6 then the output dc  
level may shift due to the additional dc gain. Gain control  
can also be done by capacitively coupling a resistor (or  
FET) from pin 6 to ground, as in Figure 7.  
Bootstrapping  
The base of the output transistor of the LM390 is brought  
out to pin 9 for Bootstrapping. The output stage of the am-  
plifier during positive swing is shown in Figure 3 with its  
external circuitry.  
a
R1  
R2 set the amount of base current available to the  
output transistor. The maximum output current divided by  
beta is the value required for the current in R1 and R2:  
b
(V /2)  
S
V
BE  
a
e
b
(R1  
R2)  
O
Additional external components can be placed in parallel  
with the internal feedback resistors to tailor the gain and  
frequency response for individual applications. For example,  
we can compensate poor speaker bass response by fre-  
quency shaping the feedback path. This is done with a se-  
ries RC from pin 6 to 13 (paralleling the internal 15 kX resis-  
I
O MAX  
e
e
100.  
Good design values are V  
0.7V and b  
BE  
O
e
Example 0.8 watt into 4X load with V  
6V.  
S
2 P  
R
O
e
e
632 mA  
I
O MAX  
0
L
j
e
tor). For 6 dB effective bass boost: R  
value for good stable operation is R  
15 kX, the lowest  
10 kX if pin 2 is  
b
(6/2) 0.7  
0.632  
a
e
e
364X  
(R1  
R2)  
100  
#
J
open. If pins 2 and 6 are bypassed then R as low as 2 kX  
can be used. This restriction is because the amplifier is only  
compensated for closed-loop gains greater than 9 V/V.  
To keep the current in R2 constant during positive swing  
capacitor C is added. As the output swings positive C lifts  
B
B
R1 and R2 above the supply, maintaining a constant voltage  
e
Input Biasing  
across R2. To minimize the value of C , R1  
B
R2. The pole  
due to C and R1 and R2 is usually set equal to the pole  
B
The schematic shows that both inputs are biased to ground  
with a 50 kX resistor. The base current of the input transis-  
tors is about 250 nA, so the inputs are at about 12.5 mV  
when left open. If the dc source resistance driving the  
LM390 is higher than 250 kX it will contribute very little  
additional offset (about 2.5 mV at the input, 50 mV at the  
output). If the dc source resistance is less than 10 kX, then  
shorting the unused input to ground will keep the offset low  
(about 2.5 mV at the input 50 mV at the output). For dc  
source resistances between these values we can eliminate  
excess offset by putting a resistor from the unused input to  
ground, equal in value to the dc source resistance. Of  
course all offset problems are eliminated if the input is ca-  
pacitively coupled.  
due to the output coupling capacitor and the load. This  
gives:  
4C  
C
c
c
j
j
C
B
b
25  
O
e
e
c
Example: for 100 Hz pole and R  
e
4X; C  
400 mF and  
L
C
16 mF, if R1 is made a diode and R2 increased to give  
B
the same current, C can be decreased by about a factor of  
B
4, as in Figure 4.  
For reduced component count the load can replace R1. The  
a
value of (R1  
R2) is the same, so R2 is increased. Now C  
B
is both the coupling and the bootstrapping capacitor (see  
Figure 2).  
When using the LM390 with higher gains (bypassing the  
1.35 kX resistor between pins 2 and 6) it is necessary to  
3
Typical Applications  
TL/H/7848–4  
TL/H/7848–3  
FIGURE 2. Load Returned to Supply  
e
FIGURE 1. Load Returned to Ground  
e
(Amplifier with Gain  
20)  
(Amplifier with Gain  
20)  
TL/H/7848–7  
FIGURE 3  
TL/H/7848–8  
e
FIGURE 4. Amplifier with Gain  
200 and Minimum C  
B
TL/H/7848–9  
FIGURE 5. 2.5W Bridge Amplifier  
4
Typical Applications (Continued)  
TL/H/784811  
FIGURE 6(b). Frequency Response  
with Bass Boost  
TL/H/784810  
FIGURE 6(a). Amplifier with Bass Boost  
TL/H/784812  
FIGURE 7. Intercom  
TL/H/784813  
FIGURE 8. AM Radio Power Amplifier  
Note 1: Twist supply lead and supply ground very tightly.  
Note 4: R1C1 band limits input signals.  
Note 5: All components must be spaced very close to IC.  
Note 2: Twist speaker lead and ground very tightly.  
Note 3: Ferrite bead is Ferroxcube K5-001-001/3B with 3 turns of wire.  
5
Physical Dimensions inches (millimeters)  
Molded Dual-In-Line Package (N)  
Order Number LM390N  
See NS Package Number N14A  
LIFE SUPPORT POLICY  
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL  
SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and whose  
failure to perform, when properly used in accordance  
with instructions for use provided in the labeling, can  
be reasonably expected to result in a significant injury  
to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform can  
be reasonably expected to cause the failure of the life  
support device or system, or to affect its safety or  
effectiveness.  
National Semiconductor  
Corporation  
National Semiconductor  
Europe  
National Semiconductor  
Hong Kong Ltd.  
National Semiconductor  
Japan Ltd.  
a
1111 West Bardin Road  
Arlington, TX 76017  
Tel: 1(800) 272-9959  
Fax: 1(800) 737-7018  
Fax:  
(
49) 0-180-530 85 86  
@
13th Floor, Straight Block,  
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Tsimshatsui, Kowloon  
Hong Kong  
Tel: (852) 2737-1600  
Fax: (852) 2736-9960  
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.  

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