SGS Thomson Microelectronics TDA7245 Datasheet
5W AUDIO AMPLIFIER WITH MUTINGAND STAND-BY
MUTINGAND STAND-BYFUNCTIONS
VOLTAGERANGEUP TO 30V
HIGHSUPPLYVOLTAGE REJECTION
SVR TYP= 50dB (f = 100Hz)
MUSICPOWER= 12W (R
PROTECTIONAGAINSTCHIP OVER
TEMPERATURE
=4Ω, d = 10%)
L
TDA7245
Powerdip 9+9
DESCRIPTION
The TDA7245 is a monolithic integrated circuit in
9+9 POWERDIP package, intended for use as
Figure1:
Testand ApplicationCircuit
ORDERING NUMBER: TDA7245
low frequency power amplifier in a wide range of
applicationsin radio and TV sets.
March 1995
1/11
TDA7245
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Supply Voltage 30 V
S
Output PeakCurrent (non repetitive t = 100µs) 3 A
Output PeakCurrent (repetitive, f > 20Hz) 2.5 A
Power Dissipation at T
at T
amb
case
=80°C
=70°C
1
6
Storage and junction Temperature -40 to 150
P
T
stg,Tj
V
I
O
I
O
tot
W
W
°
C
PIN CONNECTION
(Topview)
THERMAL DATA
Symbol Description Value Unit
2/11
R
th j-case
Rth j-amb
Thermal Resistance junction-case
Thermal Resistance junction-ambient
Max
Max
15
70
C/W
°
C/W
°
TDA7245
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, T
=25°C,f = 1kHz; unless otherwise
amb
specified).
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
V
O
I
d
P
O
d Harmonic Distortion V
R
I
BW Small signal bandwidth (-3dB) P
G
V
G
V
e
N
S/N Signal to Noise Ratio V
SVR Supply Voltage Rejection V
T
sd
Supply Voltage 12 30 V
Quiescent Output Voltage VS= 24V 11.6 V
Quiescent Drain Current VS= 14V
V
= 28V
S
17
21 35
Output Power d = 1%, f = 1KHz
V
= 14V, RL=4Ω
S
V
= 18V, RL=8Ω
S
4
4
d = 10%, f = 1KHz
= 14V, RL=4Ω
V
S
V
= 18V, RL=8
S
Ω
4
5
5
Music Power (*)
= 24V, d = 10%, RL=4
V
S
= 14V, RL=4Ω,
S
P
= 50mW to 3W
O
f = 1KHz
f = 10KHz
V
= 18V, RL=8Ω,
S
P
= 50mW to 3.5W
O
f = 1KHz
f = 10KHz
V
= 22V, RL=16Ω,
S
P
= 50mW to 3W
O
f = 1KHz
f = 10KHz
Ω
12
0.15
0.8
0.12
0.5
0.08
0.4
0.5 %
Input Impedance f = 1kHz 30 k
=1W;RL=4Ω VS= 14V 50 to 40,000 Hz
O
Voltage Gain (open loop) f= 1kHz 75 dB
Voltage Gain (closed loop) f = 1kHz 39 40 41 dB
Total Input Noise B = 22 - 22,000Hz
R
Thermal shut-down Junction
=50Ω
s
R
=1k
Ω
s
R
= 10k
Ω
s
= 18V; RL=8Ω
S
P
=5W; RS= 10K
O
= 16.5V; RL=8Ω; f = 100Hz
S
R
= 10kΩ;Vr= 0.5Vrms
s
Ω
40 50 dB
1.7
2
36
86 dB
150 °C
Temperature
mA
mA
W
W
W
W
W
%
%
%
%
%
Ω
mV
µ
µ
V
V
MUTE FUNCTION
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
ATT
m
Pin 4 DC Voltage Mute SW Open (play) 6.4 V
Muting Attenuation f = 100Hz to 10kHz 60 65 dB
m
3/11
TDA7245
ELECTRICALCHARACTERISTCS
(Continued)
STAND-BYFUNCTION
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
st-by
I
st-by
ATT
st-by
V
t
I
d st-by
Note (*):
MUSIC POWER CONCEPT
MUSIC POWER is ( according to the IEC clauses n.268-3 of Jan 83) the maximal power which the amplifier is capable of producing across the
rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz.
According to this definition our method of measurement comprises the followingsteps:
1) Set the voltage supply at the maximum operating value -20%
2) Apply a input signal in the form of a 1KHz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec
3) The output voltage is measured 1 sec from thestart of the pulse
4) Increase the input voltage until the output signal show a THD = 10%
5) The music power is thenV
The target of this method isto avoid excessive dissipation in theamplifier.
Pin 5 DC Voltage Mute SW Open (play) 6.4 V
Pin 5 Current Mute SW Closed (st-by) 160 280
µ
Stand-by Attenuation f = 100Hz to 10kHz 70 90 dB
Stand-by Threshold (pin 5) 3.8 V
Stand-by Current VS= 14V 1 3 mA
2
/R1,where V
out
isthe output voltage measured in the condition of point 4) and R1 is the ratedload impedance
out
A
Figure 2: Schematic Diagram
4/11
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