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TBA820M - 1.2W AUDIO AMPLIFIER
TBA820M
1.2W AUDIO AMPLIFIER
DESCRIPTION
The TBA820M is a monolithic integrated audio
amplifier in a 8 lead dual in-line plastic package. It
is intended for use as low frequency class B power
amplifier with wide range of supply voltage: 3 to
16V, in portable radios, cassette recorders and
players etc. Main features are: minimum working
supply voltage of 3V, low quiescent current, low
number of external components, good ripple rejec-
tion, no cross-over distortion, low power dissipa-
tion.
Output power: P o = 2W at 12V/8 W , 1.6W at 9V/4 W
and 1.2W at 9V/8 W .
Minidip
ORDERING NUMBER: TBA820M
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V s
Supply voltage
16
V
I o
Output peak current
1.5
A
P tot
Power dissipation at T amb =50
°
C
1
W
T stg ,T j Storage and junction temperature
-40 to 150
C
TEST AND APPLICATION CIRCUITS
Figure 1. Circuit diagram with load connected to the
supply voltage
Figure 2. Circuit diagram with load connected
to ground
* Capacitor C6 must be used when high rip-
ple rejection is requested.
June 1988
1/6
°
154426535.002.png
TBA820M
PIN CONNECTION (top view)
SCHEMATIC DIAGRAM
THERMAL DATA
Symbol
Parameter
Value
Unit
R th-j-amb
Thermal resistance junction-ambient
max
100
C/W
2/6
°
154426535.003.png
TBA820M
ELECTRICAL CHARACTERISTICS (Refer to the test circuits Vs = 9V, T amb =25 ° C unless otherwise
specified)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
V s
Supply voltage
3
16
V
V o
Quiescent output voltage (pin 5)
4
4.5
5
V
I d
Quiescent drain current
4
12
mA
I b
Bias current (pin 3)
0.1
m
A
P o
Output power
d = 10%
R f = 120
f = 1 kHz
W
V s = 12V
V s =9V
V s =9V
V s =6V
V s = 3.5V
W
R L =4
2
1.6
1.2
0.75
0.25
W
W
W
W
W
W
R L =8
W
R L =4
0.9
W
R L =4
W
Ri
Input resistance (pin 3)
f = 1 kHz
5
M
W
B
Frequency response (-3 dB)
W
C 5 = 1000 m F
R f = 120
C B = 680 pF
25 to 7,000
Hz
W
C B = 220 pF
25 to 20,000
d
Distortion
P o = 500 mW
R L =8
R f =33
W
0.8
W
f=1kHz
%
R f = 120
W
0.4
G v
Voltage gain (open loop)
f = 1 kHz
R L =8
W
75
dB
G v
Voltage gain (closed loop)
R L =8
W
R f =33
W
45
dB
f=1kHz
R f = 120
W
34
e N
Input noise voltage (*)
3
m
V
i N
Input noise current (*)
0.4
nA
S
+
N
Signal to noise ratio (*)
P o = 1.2W
R L =8
R1 = 10K
W
80
W
G v =34dB
dB
N
R1 = 50 k
W
70
SVR
Supply voltage rejection
(test circuit of fig. 2)
W
f (ripple) = 100 Hz
C6 = 47
m
F
R f = 120
W
42
dB
(*) B = 22 Hz to 22 KHz
3/6
R L =8
R L =8
R L =8
154426535.004.png
TBA820M
Figure 3. Output power vs.
supply voltage
Figure 4. Harmonic distortion
vs. output power
Figure 5. Power dissipation
and efficiency vs. output
power
Figure 6. Maximum power
dissipation (sine wave
operation)
Figure 7. Suggested value of
C B vs. R f
Figure 8. Frequency res-
ponse
Figure 9. Harmonic distortion
vs. frequency
Figure 10. Supply voltage
rejection (Fig. 2 circuit)
Figure 11. Quiescent current
vs. supply voltage
4/6
154426535.005.png
TBA820M
MINIDIP PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
3.32
0.131
a1
0.51
0.020
B
1.15
1.65
0.045
0.065
b
0.356
0.55
0.014
0.022
b1
0.204
0.304
0.008
0.012
D
10.92
0.430
E
7.95
9.75
0.313
0.384
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
6.6
0.260
I
5.08
0.200
L
3.18
3.81
0.125
0.150
Z
1.52
0.060
5/6
154426535.001.png

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