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TDA7245-TDA7245.
5W AUDIO AMPLIFIER WITH MUTING AND STAND-BY
TDA72455W AUDIO AMPLIFIER WITH MUTING AND STAND-BY
MUTING AND STAND-BY FUNCTIONS
VOLTAGE RANGE UP TO 30V
HIGH SUPPLY VOLTAGE REJECTION
SVR TYP = 50dB (f = 100Hz)
MUSIC POWER = 12W (RL = 4Ω, d = 10%)
PROTECTION AGAINST CHIP OVER
TEMPERATURE
DESCRIPTIONThe TDA7245 is a monolithic integrated circuit in
9+9 POWERDIP package, intended for use as low frequency power amplifier in a wide range of
applications in radio and TV sets.
Figure 1: Test and Application Circuit
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION (Top view)
THERMAL DATA
TDA7245
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tamb = 25°C, f = 1kHz; unless otherwisespecified).
MUTE FUNCTION
TDA7245
ELECTRICAL CHARACTERISTCS (Continued)STAND-BY FUNCTION
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 following steps:
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 the start of the pulse
4) Increase the input voltage until the output signal show a THD = 10%
5) The music power is then V2 out/R1, where Vout is the output voltage measured in the condition of point 4) and R1 is the rated load impedance
The target of this method is to avoid excessive dissipation in the amplifier.
Figure 2: Schematic Diagram
TDA7245
APPLICATION SUGGESTIONSThe recommended values of the external components are those shown on the application circuit of fig.1.
Different values can be used. The following table can help the dsigner.
(*) The value of closed loop gain (GV = 1 + R2/R3) must be higher than 25dB.
Figure 3: P.C. Board and Components Layout of the Circuit of fig 2 (1:1 scale)
TDA7245
