TBA820M LINEAR INTEGRATED CIRCUIT
1
1.2W AUDIO POWER AMPLIFIER
DESCRIPTION
The Contek TBA820M is a monolithic integrated audio
amplifier.
It is designed for audio frequency class b amplifier.
FEATURES
*Wide operating supply voltage:Vcc=3~14V
*Medium output power
Po=1.2W at Vcc=9V,R L=8 ohm ,Thd=10%
*Low quiesent circuit current:ICCQ=4mA(type)
*Good ripple rejection.
*Minimum number of external parts required.
DIP-8
BLOCK DIAGRAM
1 2 3 4
8 7 6 5
Ripple Bootstrap Vcc Output
CB NF Input GND
ABSOLUTE MAXIMUM RATINGS(Ta=25 C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc 16 V
Output Peak Current Ipeak 1.5 A
Power Dissapation PD1.25 W
Operating Temperature Topr -20 ~ +70 C
Storage Temperature Tstg -40 ~ +150 C
Contek
TBA820M
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
TBA820M LINEAR INTEGRATED CIRCUIT
2
ELECTRICAL CHARACTERISTICS(Ta=25 C,Vcc=9V,f=1kHz,RG=600 W,RF=120W,RL=8W,unless
otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Quiescent Circuit Current ICCQ VI=0 4 12 mA
Vcc=9V,R L=4W,THD=10% 1.6
Vcc=9V,R L=8W,THD=10% 0.9 1.2
Output Power Po Vcc=6V,R L=4W,THD=10% 0.75 W
Vcc=6V,R L=8W,THD=10% 0.4 0.5
Vcc=12V,R L=8W,THD=10% 2
Total Harmonic Distortion THD Po=500mW 0.3 1 %
Open Loop Voltage Gain Gvo RF=0 75 dB
Closed Loop Voltage Gain Gvc RF=120W33 36 39 dB
Input Resistance RI 5 MW
Output Noise Voltage VNO RG=10kW
BW(-3dB)=50~20kHz
0.3 1 mW
TEST CIRCUIT
Contek TBA820M
3
248
5
1
7
6
VCC
R1
10K W
RF
120 W
R2
1WRL
4W
R3
56W
100 mF/10V
100 mF/16V
CB(Bootstrap
Cap)
47 mF/
10V
0.1 mF
INPUT
OUTPUT
0.1 mF
220 mF/15V
100 mF/15V
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
TBA820M LINEAR INTEGRATED CIRCUIT
3
TYPICAL PERFORMANCE CHARACTERISTICS
Fig 1 Quienscent circuit current
vs Supply Voltage
Fig 2 Output power vs Supply
Voltager
Fig 3 Total harmonic Distortion
vs Output power
40 8 12 16 20
0
4
8
VI=0
Supply Voltage(V)
Quiescent Current(mA)
40 8 12 16 20
Supply Voltage(V)
0
0.4
0.8
1.6
2.0
1.2
Output Power(W)
THD=10%
f=1kHz
RF=120W
RL=4W
RL=8W
RL=16W
0 0.4 0.8 1.2 1.6
Output Power(W)
Total harmonic Distortion ( %)
0
4
8
12
16
Vcc=9V
RL=8W
RF=120W
f=1kHz
0 50 100 150
0
20
40
60
80
Closed loop Voltage Gain(dB)
Fig 4 Voltage Gain vs Feedback
resistance
Fig 5 Power Dissipation vs
Output power
Vcc=9V
RL=8W
f=1kHz
0 0.4 0.8 1.2 1.6
Output Power(W)
2.0
Power Dissipation(W)
0
0.25
0.5
Power Dissipation(W)
0
0.5
1.0
0481216
Supply Voltage(V)
20
RL=16W
RL=8W
RL=4W
Fig 6 Power Dissipation vs
Supply Voltage
Vcc=9V
RL=8W
f=1kHz
Fig 7 Frequency response Fig 8 Total Harmonic distortion
vs frequency
10 10
3
10
210
410
510 10
3
10210
410
5
0
0
2
3
4
5
Frequency(Hz)
Total Harminoc distortion(%)
Frequency(Hz)
Response(dB)
-5
-3
-1
1
3
CB=660pF
CB=220pF
RF=120W
1
Po=50mW Po=500mW
Vcc=9V
RL=8W
RF=120W
Feedback Resistance(W)
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
