TBA820M 1.2W Audio Power Amplifier
TBA820M
1.2W Audio Power Amplifier
Order code: 82-0485
Description:
The TBA820M is a monolithic integrated audio amplifier.
It is designed for an audio frequency Class B amplifier.
Features:
•
•
Wide operating supply voltage: VCC=3 to 14V
Medium output power
POUT=1.2W at VCC=9V, RL=8Ω, THD=10%
• Low quiescent circuit current: IQ=4mA(type)
• Good ripple rejection
• Minimum number of external parts required
DIP-8
Pb-free plating product
number: TBA820ML
Absolute maximum rating (Ta=25°C)
Block diagram:
Parameter
Symbol
Ratings
Unit
Supply voltage
VCC
16
V
Output peak current
IO(peak)
1.5
A
Power dissipation
PD
1.25
W
Operating temperature
Topr
0 to +70
°C
Storage temperature
Tstg
–40 to +150
°C
Notes:
1 Absolute maximum ratings are stress ratings only and functional
device operation is not implied. The device could be damaged
beyond Absolute maximum ratings
2 The device is guaranteed to meet performance specifications within
0°C to 70°C operating temperature range and assured by design
from –20°C to 85°C
Ripple
Bootstrap
Vcc
Output
8
7
6
5
1
2
3
4
CB
NF
Input
GND
Electrical characteristics
(Ta=25°C, VCC=9V, F=1KHZ, RG=600Ω, RF=120Ω, RL=8Ω, unless otherwise specified)
Parameter
Symbol
Test conditions
Min.
Typ.
Max.
Unit
Quiescent current
IQ
VIN=0
–
4
12
mA
VCC=9V, RL=4Ω, THD=10%
–
1.6
–
VCC=9V, RL=8Ω, THD=10%
0.9
1.2
–
VCC=6V, RL=4Ω, THD=10%
–
0.75
–
VCC=6V, RL=8Ω, THD=10%
0.4
0.5
–
Output power
POUT
W
VCC=12V, RL=8Ω, THD=10%
–
2
Total harmonic distortion
THD
POUT=500mW
–
0.3
1
%
Open loop voltage gain
GVO
RF=0
–
75
–
dB
Closed loop voltage gain
GVC
RF=120Ω
33
36
39
dB
Input resistance
RIN
–
5
–
MΩ
Output noise voltage
eN
–
0.3
1
mV
RG=10kΩ, BW(≠3dB)=50 to 20kHz
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TBA820M
Order code: 82-0485
Test circuit:
V CC
R3
56 Ω
100 µF/16V
INPUT
6
3
CB (Bootstrap
7
Cap)
2
RF
120 Ω
100 µF/10V
4
100 µF/15V
1
UTC TBA820M
R1
10K
0.1 µF
OUTPUT
5
220 µF/15V
8
R2
1Ω
RL
4Ω
0.1 µF
47
µF/10V
Page 2 of 4
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TBA820M
Order code: 82-0485
Typical characteristics
Fig 1 Quiescent circuit current vs
Supply Voltage
Fig 2 Output power vs Supply Voltage
2.0
V IN =0
4
R L=4Ω
R L=16 Ω
1.2
0.8
THD=10%
f=1kHz
R F =120 Ω
0.4
0
0
4
8
12
Supply Voltage(V)
16
0
20
Fig 3 Total harmonic Distortion vs Output power
Vcc=9V
R L =8Ω
R F =120 Ω
f=1kHz
16
12
8
4
0
0
0.4
0.8
1.2
Output Power(W)
0
4
8
12
Supply Voltage(V)
16
20
Fig 4 Voltage Gain vs Feedback resistance
Closed loop Voltage Gain(dB)
Total harmonic Distortion ( %)
R L =8Ω
1.6
Output Power(W)
Quiescent Current(mA)
8
80
60
40
20
0
1.6
Vcc=9V
R L =8Ω
f=1kHz
0
50
100
Feedback Resistance(Ω)
150
Fig 6 Power Dissipation vs Supply Voltage
Fig 5 Power Dissipation vs Output power
0.5
1.0
0.25
0
Vcc=9V
R L=8 Ω
f=1kHz
0
0.4
0.8
1.2
Output Power(W)
1.6
2.0
Power Dissipation(W)
Power Dissipation(W)
R L =8 Ω
R L=4 Ω
R L=16 Ω
0.5
0
0
4
8
12
Supply Voltage(V)
16
20
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TBA820M
Order code: 82-0485
Typical characteristics – continued
Fig 7 Frequency response
Fig 8 Total Harmonic distortion vs frequency
5
R F =120Ω
1
Total Harminoc distortion(%)
Response(dB)
3
CB=220pF
0
-1
CB=660pF
-3
-5
10
10
2
10
3
Frequency(Hz)
10
4
10
5
4
Vcc=9V
RL=8Ω
RF=120Ω
3
2
PoUT=50mW
PoUT=500mW
1
0
10
10
2
10
3
Frequency(Hz)
10
4
10
5
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