UNISONIC TECHNOLOGIES CO.,LTD.
TEA2025A
STEREO AUDIO AMPLIFIER
DESCRIPTION
The UTC
TEA2025A
is a monolithic integrated circuit,
consisting of a 2-channel power amplifier. It is suitable for stereo
and bridge amplifier application of radio cassette tape recorders.
LINEAR INTEGRATED CIRCUIT
FEATURES
* High output power
Stereo: Po=2.3W (Typ) at Vcc=9V, R
L
=4
Ω
Bridge: Po=4.7W (Typ) at Vcc=9V, R
L
=8Ω
* Low switching distortion at high frequency
* Small shock noise at the time of power on/off dur to a built-in
muting circuit
* Good ripple rejection due to a built-in ripple filter
* Good channel separation
* Soft tone at the time of output straiten
* Closed loop voltage gain fixed 45dB (Bridge: 51dB) but
availability with external resistor added
* Minimum number of external parts required
* Easy to design radiator fin
ORDERING INFORMATION
Order Number
Lead Free
TEA2025AL-D12-H-T
Halogen Free
TEA2025AG-D12-H-T
Package
DIP-12H
Packing
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co.,LTD.
1
QW-R107-033.B
TEA2025A
PIN CONFIGURATION
BTL OUT
LINEAR INTEGRATED CIRCUIT
1
2
3
12
11
V
CC
OUT 1
B.S.1
OUT 2
B.S.2
10
NF2
4
5
6
9
8
7
NF1
IN 1
PRE GND
IN 2
DC
BLOCK DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2
QW-R107-033.B
TEA2025A
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(T
A
=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
V
S
15
V
Power Dissipation
P
D
4
W
Operating Temperature
T
OPR
-20~+70
°C
Storage Temperature
T
STG
-40~+150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, R
G
=600V, Stereo, unless otherwise specified.)
PARAMETER
Operating Supply Voltage
Quiescent Current
Closed Loop Voltage Gain
Channel Balance
Output Power
Total Harmonic Distortion
Input Resistance
Rijpple Rejection
Output Noise Voltage
Cross-Talk
SYMBOL
V
CC
I
CC
A
V
C
B
P
O
T
HD
R
I
R
R
V
NO
C
T
Stereo, Rg=0Ω, Vr=150mV,
f=100Hz
Stereo, Rg=0Ω
Stereo, Rg=10KΩ
Stereo, Rg=10KΩ, Vo=0dBm
TEST CONDITIONS
Vi=0, Stereo
Stereo, Vi=-45dBm
Bridge, Vi=-45dBm
Stereo
Stereo, R
L
=4Ω, THD=10%
Stereo, R
L
=8Ω, THD=10%
Bridge, R
L
=8Ω, THD=10%
Stereo, Po=250mW, R
L
=4Ω
Bridge, Po=250mW, R
L
=4Ω
MIN TYP MAX UNIT
3
12
V
40
50 mA
43
45
47
dB
49
51
53
dB
-1
0
+1
dB
1.7 2.3
W
1.3
W
4.7
W
0.3 1.5
%
0.5
%
21
30
KΩ
40
46
1.5
3
55
3
6
dB
mV
mV
dB
40
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3
QW-R107-033.B
TEA2025A
APPLICATION IN FORMATION
Stereo Amplifier
LINEAR INTEGRATED CIRCUIT
Bridge Amplifier
INPUT
0.22μF
+ C1
100µ/16V
7
8
9
Fin
C2 100µ/16V
+
VCC
+
C3
0.15µ
+
C4
470µ/16V + C5
100µF
R
L
10 11 12
UTC TEA2025A
6
C10 +
100µ/16V
+
5
4
Fin
3
2
1
C6
+ 470µ/16V
+
C7
0.15µ
Polyester film capacitor
+
C8
100µ/16V
C9 100µ/16V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4
QW-R107-033.B
TEA2025A
APPLICATION INFORMATION
LINEAR INTEGRATED CIRCUIT
Input Capacitor
Input capacitor is PNP type allowing source to be referenced to ground. In this way no input coupling capacitor is
required. However, a series capacitor (0.22 uF)to the input side can be useful in case of noise due to variable
resistor contact.
Bootstrap
The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors
(100uF) avoids a reduction of the output signal also at low frequencies and low supply voltages.
Voltage Gain Adjust
STEREO MODE (Figure 1)
The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected
between pin 6 (11) and ground. The frequency response is given approximated by:
With R
f
=0, C
1
=100μF, the gain results 46 dB with pole at f=32 Hz.
The purpose of Rf is to reduce the gain. It is recommended to not reduce it under 36 dB.
6 (11)
R
2
2 (15)
R
f
R
1
C1
Figure 1
BRIDGE MODE (Figure 2)
The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin 1) the
CH 1 output signal after reduction. It is enough to connect pin 6 (inverting input of CH 2) with a capacitor to pin 1 and
to connect to ground the pin 7.
The total gain of the bridge is given by:
and with the suggested values (C1 = C2 = 100 uF, R
f
= 0) means: Gv = 52 dB with first pole at f = 32 Hz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5
QW-R107-033.B
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