ST_TEA2025B.pdf

(87 KB) Pobierz
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
POWERDIP 12+2+2
SO20 (12+4+4)
ORDERING NUMBERS: TEA2025B (PDIP)
TEA2025D (SO)
•
1W, V CC = 6V, R L =4
W
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.
P=2
W
P=2 • 0.1W, V CC = 3V, R L =4 W
•
2.3W, V CC = 9V, R L =4
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Test Conditions
Unit
V S
Supply Voltage
15
V
I O
Ouput Peak Current
1.5
A
Junction Temperature
150
°
C
T J
T stg
Storage Temperature
150
°
C
BLOCK DIAGRAM
GND(Sub)
IN 1+
FEED
GND
GND
BOOT 1
OUT 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
804040834.002.png
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
7
10
IN.2 (+)
IN.1 (+)
SVR
8
9
GND (sub.)
SO 12+4+4 PIN CONNECTION (Top view)
BRIDGE
OUT 2
BOOT 2
GND
1
20
19
18
17
V CC
2
OUT 1
3
BOOT 1
4
GND
GND
5
6
7
8
9
16
GND
GND
GND
15
GND
14
GND
FEEDBACK
IN 2(+)
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
804040834.003.png
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
D
A V
Voltage Gain Difference
±
1
dB
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
32
W
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
1.5
Stereo
Bridge
0.3
0.5
d
Distortion
Vs = 9V; R L =4
W
%
SVR
Supply Voltage Rejection
f = 100Hz, V R = 0.5V, R g =0
46
dB
40
R G =0
R G =104
1.5
3
3
6
E N ( IN )
Input Noise Voltage
mV
W
52
dB
CT
Cross-Talk
f = 1KHz, R g = 10K
W
40
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
C10
C4
C8
C2
C5
C7
C11
C9
C3
3/9
804040834.004.png
TEA2025B - TEA2025D
Figure 3: Supply Current vs. Supply Voltage
(R L =4 W )
Figure 4: Output Voltage vs. Supply Voltage
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=16ohmRl=8ohm
2.5
Rl=8ohm
Rl=4ohm
Rl=16ohm
Rl=4 OHM
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
804040834.005.png
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.
V OUT
V IN
R1
R3
R4
R1
=
( 1 +
)
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
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
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
V OUT
V IN
R1
=
Output Capacitors.
The low cut off frequency due to output capacitor
depending on the load is given by:
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.
Rf
+
R2
+
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
804040834.001.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin