TDA1904.pdf

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4W AUDIO AMPLIFIER
TDA1904
4W AUDIO AMPLIFIER
HIGH OUTPUT CURRENT CAPABILITY
PROTECTION AGAINST CHIP OVERTEM-
PERATURE
LOW NOISE
HIGH SUPPLY VOLTAGE REJECTION
SUPPLY VOLTAGE RANGE: 4V TO 20V
Powerdip
(8 + 8)
DESCRIPTION
The TDA 1904 is a monolithic integrated circuit in
POWERDIP package intended for use as low-fre-
quency power amplifier in wide range of applica-
tions in portable radio and TV sets.
ORDERING NUMBER : TDA 1904
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
Supply voltage
20
V
I O
Peak output current (non repetitive)
2.5
A
I O
Peak output current (repetitive)
2
A
P tot
Total power dissipation at T amb =80
°
C
1
W
at T pins =60
°
C
6
W
T stg ,T j
Storage and junction temperature
-40 to 150
° C
TEST AND APPLICATION CIRCUIT
(*) R4 is necessary only for V s <6V.
March 1993
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TDA1904
PIN CONNECTION (top view)
SCHEMATIC DIAGRAM
THERMAL DATA
Symbol
Parameter
Value
Unit
R th-j-case
Thermal resistance junction-pins
max
15
C/W
R th-j-amb
Thermal resistance junction-ambient
max
70
C/W
2/10
°
°
20664234.003.png
TDA1904
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, T amb =25
°
C, R th (heatsink) =
20 ° C/W, unless otherwisw specified)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
V s
Supply voltage
4
20
V
V o
Quiescent output voltage
V s =4V
V s = 14V
2.1
7.2
V
I d
Quiescent drain current
V s =9V
V s = 14V
8
10
15
18
mA
P o
Output power
d = 10%
V s =9V
V s = 14V
V s = 12V
V s =6V
f = 1 KHz
R L =4
W
1.8
4
3.1
0.7
2
4.5
W
d
Harmonic distortion
f = 1 KHz
V s =9V
R L =4
W
0.1
0.3
%
P o = 50 mW to 1.2W
V i
Input saturation voltage
(rms)
V s =9V
V s = 14V
0.8
1.3
V
R i
Input resistance (pin 8)
f = 1 KHz
55
150
K
W
h
Efficiency
f = 1 KHz
V s =9V R L =4
W
P o =2W
70
65
%
V s = 14V R L =4
W
P o = 4.5W
BW
Small signal bandwidth (-3 dB) V s = 14V
R L =4
W
40 to 40,000
Hz
G v
Voltage gain (open loop)
V s = 14V
f = 1 KHz
75
dB
G v
Voltage gain (closed loop)
V s = 14V
f = 1 KHz
W
P o =1W
39.5
40
40.5
dB
e N
Total input noise
W
R g =10K W
(
°
)
1.2
2
m
V
4
W
R g =10K
(
°°
)
2
3
m
V
W
SVR
Supply voltage rejection
V s = 12V
f ripple = 100 Hz
V ripple = 0.5 Vrms
R g =10K W
40
50
dB
T sd
Thermal shut-down case
temperature
P to t = 2W
120
ÉC
Note: (
°
) Weighting filter = curve A.
°°
) Filter with noise bendwidth: 22Hz to 22 KHz.
3/10
R L =4
R g =50
R g =50
(
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TDA1904
Figure 1. Test and application circuit
(*) R4 is necessary only for V S <6V
Figure 2. P.C. board and components layout of fig. 1 (1 : 1 scale)
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TDA1904
APPLICATION SUGGESTION
The recommended values of the external compo-
nents are those shown on the application circuit of
fig. 1.
When the supply voltage V S is less than 6V, a 68 W
resistor must be connected between pin 2 and pin
3 in order to obtain the maximum output power.
Different values can be used. The following table
can help the designer.
Components
Recomm.
value
Purpose
Larger than
recommended value
Smaller than
recommended value
Allowed range
Min.
Max.
R1
10 K
W
Increase of gain.
Decrease of gain.
Increase quiescent
current.
9R3
Feedback resistors
R2
100
W
Decrease of gain.
Increase of gain.
1K
W
R3
4.7
W
Frequency stability
Danger of oscillation at
high frequencies with
inductive loads.
R4
68
W
Increase of the
output swing with
low supply voltage.
39
W
220
W
C1
2.2
m
F
Input DC
decoupling.
Higher cost lower
noise.
Higher low
frequency cutoff.
Higher noise.
C2
0.1
m
F
Supply voltage
bypass.
Danger of
oscillations.
C3
22
m
F
Ripple rejection
Increase of SVR
increase of the
switch-on time.
Degradation of SVR. 2.2
m
F 100
W
F
C4
2.2 m F
Inverting input DC
decoupling.
Increase of the
switch-on noise
Higher low
frequency cutoff.
0.1 W F
C5
47
m
F
Bootstrap.
Increase of the
distortion at low
frequency.
10
m
F 100
m
F
C6
0.22
m
F
Frequency stability.
Danger of oscillation.
C7
1000
m
F Output DC
decoupling
Higher low
frequency cutoff.
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