ST_TEA2025B_2.pdf

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TEA2025B
TEA2025D
STEREO AUDIO AMPLIFIER
DUAL OR BRIDGE CONNECTION MODES
FEW EXTERNAL COMPONENTS
SUPPLY VOLTAGE DOWN TO 3V
HIGH CHANNEL SEPARATION
VERY LOW SWITCH ON/OFF NOISE
MAX GAIN OF 45dB WITH ADJUST EXTER-
NAL RESISTOR
SOFT CLIPPING
THERMAL PROTECTION
3V < V CC < 15V
P = 2 · 1W, V CC = 6V, R L = 4 W
P = 2 · 2.3W, V CC = 9V, R L = 4 W
P = 2
POWERDIP 12+2+2 SO20 (12+4+4)
ORDERING NUMBERS: TEA2025B (PDIP)
TEA2025D (SO)
DESCRIPTION
The TEA2025B/D is a monolithic integrated circuit
in 12+2+2 Powerdip and 12+4+4 SO, intended for
use as dual or bridge power audio amplifier port-
able radio cassette players.
·
0.1W, V CC = 3V, R L = 4
W
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Test Conditions
Unit
V S
Supply Voltage
15
V
I O
Ouput Peak Current
1.5
A
T J
Junction Temperature
150
°C
T stg
Storage Temperature
150
°C
BLOCK DIAGRAM
GND ( Sub)
IN 1 +
FE E D
G N D
G N D
BO O T 1
OU T 1
50
W
THERMAL
PROTECT.
10K
W
-
+
1
1
START
CIRCUIT
5K W
SVR
DECOUPLING
V S+
BRIDGE
IN 2+
-
+
50
W
2
2
10K
W
50
W
FEED
GND
GND
BOOT 2
OUT 2
D94AU120
1/9
June 1994
 
TEA2025B - TEA2025D
POWERDIP 12+2+2 PIN CONNECTION (Top view)
BRIDGE
1
16
+Vs
OUT.2
2
15
OUT.1
BOOT.2
3
14
BOOT.1
GND
4
13
GND
GND
5
12
GND
FEEDBACK
6
11
FEEDBACK
IN.2 (+)
7
10
IN.1 (+)
SVR
8
9
GND (sub.)
SO 12+4+4 PIN CONNECTION (Top view)
BRIDGE
OUT 2
BOOT 2
GND
GND
1
20
19
18
17
16
V CC
2
OUT 1
3
BOOT 1
4
5
6
7
GND
GND
GND
GND
15
GND
14
GND
FEEDBACK
IN 2(+)
8
9
13
12
FEEDBACK
IN 1(+)
SVR
10
11
GND(Sub)
D94AU119
THERMAL DATA
Symbol
Description
SO 12+4+4 (*)
PDIP 12+2+2 (**)
Unit
R th j-case
R th j-amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max
Max
15
65
15
60
°
C/W
C/W
°
(*) The R th j-amb is measured with 4sq cm copper area heatsink
m thick copper surface of 5 cm 2 .
(**) The R th j-amb is measured on devices bonded on a 10 x 5 x 0.15cm glass-epoxy substrate with a 35
m
2/9
 
TEA2025B - TEA2025D
ELECTRICAL CHARACTERISTICS (T amb = 25 ° C, V CC = 9V, Stereo unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V S
Supply Voltage
3
12
V
I Q
Quiescent Current
35
50
mA
V O
Quiescent Output Voltage
4.5
V
Stereo
Bridge
43
49
45
51
47
53
A V
Voltage Gain
dB
A V
Voltage Gain Difference
1
dB
D
±
j
Input Impedance
30
K
W
PO
Output Power (d = 10%)
Stereo 8 (per channel)
9V
9V
6V
6V
6V
6V
3V
3V
12V
4
8
1.7
2.3
1.3
1
0.6
0.25
0.13
0.1
0.02
2.4
4
8
0.7
W
16
W
W
32
W
W
32
4
W
8
W
9V
6V
6V
3V
3V
8
4
4.7
2.8
1.5
0.18
0.06
8
Bridge
W
16
W
W
32
W
Stereo
Bridge
0.3
0.5
1.5
d
Distortion
Vs = 9V; R L = 4
W
%
SVR
Supply Voltage Rejection
f = 100Hz, V R = 0.5V, R g = 0
40
46
dB
R G = 0
R G = 10 4
1.5
3
3
6
E N ( IN )
Input Noise Voltage
mV
W
40
CT
Cross-Talk
f = 1KHz, R g = 10K
W
52
dB
Term. N
°
(PDIP)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DC VOLT (V)
0.04
4.5
8.9
0
0
0.6
0.04
8.5
0
0.04
0.6
0
0
8.9
4.5
9
Figure 2: Stereo Application (Powerdip)
Figure 1: Bridge Application (Powerdip)
C1
C6
C 10
C4
C8
C2
C5
C 7
C 11
C9
C3
3/9
 
TEA2025B - TEA2025D
Figure 3: Supply Current vs. Supply Voltage
(R L = 4
Figure 4: Output Voltage vs. Supply Voltage
W
)
Vo(V)
I(mA)
8
50
7
6
40
5
4
30
3
2
20
STEREO
1
STEREO
0
10
3
6
9
12
15
3
6
9
12
15
Vs(V)
Vs(V)
Figure 6: THD versus Output Power
(f = 1KHz, V S = 6V)
Figure 5: Output Power vs. Supply Voltage
(THD = 10%, f = 1KHz)
THD(%)
Po(W)
10
3.5
3
Rl=16oh Rl=8ohm
2.5
Rl=8ohm
Rl=4ohm
Rl=4 OHM
Rl=16ohm
2
1
1.5
1
STEREO
0.5
STEREO
0.1
0
0
0.2
0.4
0.6
0.8
1
3
6
9
12
15
Po(W)
Vs(V)
4/9
 
TEA2025B - TEA2025D
The total gain of the bridge is given by:
APPLICATION INFORMATION
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.
V OUT
V IN
R1
( 1 + R3
R1
=
R4
)
1
JWC1
1
JWC1
Rf
R2
R2
R4
+
+
+
+
and with the suggested values (C1 = C2 = 100
m
F,
Rf= 0) means:
Gv = 52 dB
Figure 8
Voltage Gain Adjust
STEREO MODE
The voltage gain is determined by on-chip resis-
tors R1 and R2 together with the external RfC1
series connected between pin 6 (11) and ground.
The frequency response is given approximated
by:
with first pole at f = 32 Hz
R1
Rf + R2 + 1
JWC1
With Rf=0, C1=100 uF, the gain results 46 dB
with pole at f=32 Hz.
THE purpose of Rf is to reduce the gain. It is rec-
ommended to not reduce it under 36 dB.
V OUT
V IN
=
Output Capacitors.
The low cut off frequency due to output capacitor
depending on the load is given by:
1
F L
=
2 P
C OUT ·
R L
with C OUT 470 m F and R L = 4 ohm it means F L =
80 Hz.
Pop Noise
Most amplifiers similar to TEA 2025B need exter-
nal resistors between DC outputs and ground in
order to optimize the pop on/off performance and
crossover distortion.
BRIDGE MODE
Figure 7
Figure 9
The bridge configuration is realized very easily
thanks to an internal voltage divider which pro-
vides (at pin 1) the CH 1 output signal after reduc-
tion. 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 TEA 2025B solution allows to save compo-
nents because of such resistors (800 ohm)are in-
cluded into the chip.
5/9
 

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