TDA7298 ,28W HI-FI AUDIO POWER AMPLIFIER WITH MUTE/STAND-BYELECTRICAL CHARACTERISTICS (Refer to the test circuit, G = 32dB; V + 18V; f = 1KHz; T =V S amb25°C ..
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TDA7298
28W HI-FI AUDIO POWER AMPLIFIER WITH MUTE/STAND-BY
TDA729828W Hi-Fi AUDIO POWER AMPLIFIER
WITH MUTE / STAND-BY
SUPPLY VOLTAGE RANGE UP TO ±22V
SPLIT SUPPLY OPERATION
HIGH OUTPUT POWER
(UP TO 28W MUSIC POWER)
LOW DISTORTION
MUTE/STAND-BY FUNCTION
NO SWITCH ON/OFF NOISE
AC SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
ESD PROTECTION
DESCRIPTIONThe TDA7298 is a monolithic integrated circuit in
Heptawatt package, intended for use as audio
class AB amplifier in TV or Hi-Fi field application.
Thanks to the wide voltage range and to the high
out current capability it’s able to supply the high-
est power into both 4Ω and 8Ω loads even in
presence of poor supply regulation.
The built in Muting/Stand-by function simplifies
the remote operations avoiding also switching on-
off noises.
TEST AND APPLICATION CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION (Top view)
BLOCK DIAGRAM
TDA7298
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, GV = 32dB; VS + 18V; f = 1KHz; Tamb =25°C, unless otherwise specified.)
MUTE/STAND-BY FUNCTION (Ref. –VS)
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 -10%
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.
THERMAL DATA
TDA7298
APPLICATIONS SUGGESTIONS (See Test and Application Circuit)The recommended values of the external components are those shown on the application circuit. Differ-
ent values can be used; the following table can help the designer.
(*) R1 = R3 = R4 for POP optimization
(**) Closed Loop Gain has to be ≥ 30dB
Figure 1: Output Power vs. Supply Voltage Figure 2: Distortion vs. Output Power
TYPICAL CHARACTERISTICS
TDA7298
Figure 3: Output Power vs. Supply Voltage. Figure 4: Distortion vs. Output Power.
Figure 5: Distortion vs. Frequency. Figure 6: Distortion vs. Frequency.
Figure 7: Quiescent Current vs. Supply Voltage Figure 8: Supply Voltage Rejection vs. Frequency.
TDA7298
