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TEA-2025 Datasheet PDF - ST Microelectronics

Part Number TEA-2025
Description STEREO AUDIO AMPLIFIER
Manufacturers ST Microelectronics 
Logo ST Microelectronics Logo 

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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 < VCC < 15V
P = 2 1W, VCC = 6V, RL = 4
P = 2 2.3W, VCC = 9V, RL = 4
P = 2 0.1W, VCC = 3V, RL = 4
ABSOLUTE MAXIMUM RATINGS
Symbol
VS Supply Voltage
IO Ouput Peak Current
TJ Junction Temperature
Tstg Storage Temperature
Parameter
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.
Test Conditions
15
1.5
150
150
Unit
V
A
°C
°C
BLOCK DIAGRAM
SVR
IN 2+
GND(Sub) IN 1+ FEED
GND
GND BOOT 1
OUT 1
THERMAL
PROTECT.
START
CIRCUIT
50
-
1
+
-
2
+
10K
DECOUPLING
10K
1
2
5K
50
VS+
BRIDGE
June 1994
D94AU120
50
FEED
GND
GND BOOT 2 OUT 2
1/9

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TEA-2025 equivalent
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.
TEA2025B - TEA2025D
The total gain of the bridge is given by:
VOUT
VIN
=
R1
Rf+R2
+
1
JWC1
(1+
R3
R4
R1
R2+R4+
1
JWC1
)
and with the suggested values (C1 = C2 = 100 µF,
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:
VOUT
VIN
=
Rf
+
R1
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.
BRIDGE MODE
Figure 7
with first pole at f = 32 Hz
Output Capacitors.
The low cut off frequency due to output capacitor
depending on the load is given by:
FL
=
2
1
ΠCOUT
RL
with COUT 470µF and RL = 4 ohm it means FL =
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.
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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