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TDA7294
100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
VERY HIGH OPERATING VOLTAGE RANGE (±40V) DMOS POWER STAGE HIGH OUTPUT POWER (UP TO 100W MUSIC POWER) MUTING/STAND-BY FUNCTIONS NO SWITCH ON/OFF NOISE NO BOUCHEROT CELLS VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN DESCRIPTION The TDA7294 is a monolithic integrated circuit in Multiwatt15 package, intendedfor use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV). Thanks to the wide voltage range and Figure 1: Typical Application and Test Circuit MULTIPOWER BCD TECHNOLOGY

Multiwatt15 ORDERING NUMBER: TDA7294V

to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poorsupply regulation, with high Supply Voltage Rejection. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises.

C7 100nF R3 22K C2 22µF +Vs R2 680Ω C1 470nF R1 22K IN+MUTE R5 10K MUTE STBY R4 22K C3 10µF C4 10µF 4 10 9 IN2

+Vs

C6 1000µF

+PWVs 13 14 OUT C5 22µF 6 BOOTSTRAP

TDA7294
-

7

IN+

3

+

VM VSTBY

MUTE STBY 1STBY-GND 8

THERMAL SHUTDOWN

S/C PROTECTION 15 -PWVs C8 1000µF
D93AU011

-Vs C9 100nF -Vs

February 1996

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TDA7294
PIN CONNECTION (Top view)

TAB connected to -VS

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS
Symbol VS IO Ptot Top Tstg, Tj 2/16 Output Peak Current Power Dissipation Tcase = 70°C Operating Ambient Temperature Range Storage and Junction Temperature ParameterSupply Voltage (No Signal) Value ±50 10 50 0 to 70 150 Unit V A W °C °C

TDA7294
THERMAL DATA
Symbol R th j-case Description Thermal Resistance Junction-case Max Value 1.5 Unit °C/W

ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit VS = ±35V, RL = 8Ω, GV = 30dB; Rg = 50 Ω; Tamb = 25°C, f = 1 kHz; unless otherwise specified.
Symbol VS Iq Ib VOS IOS PO Parameter Supply Range QuiescentCurrent Input Bias Current Input Offset Voltage Input Offset Current RMS Continuous Output Power d = 0.5%: VS = ± 35V, RL = 8Ω VS = ± 31V, RL = 6Ω VS = ± 27V, RL = 4Ω d = 10% RL = 8Ω ; VS = ±38V RL = 6Ω ; VS = ±33V RL = 4Ω ; VS = ±29V (***) PO = 5W; f = 1kHz PO = 0.1 to 50W; f = 20Hz to 20kHz VS = ±27V, RL = 4Ω: PO = 5W; f = 1kHz PO = 0.1 to 50W; f = 20Hz to 20kHz SR GV GV eN fL, fH Ri SVR TS VST onVST off ATT st-by Iq st-by VMon VMoff ATTmute Slew Rate Open Loop Voltage Gain Closed Loop Voltage Gain Total Input Noise Frequency Response (-3dB) Input Resistance Supply Voltage Rejection Thermal Shutdown f = 100Hz; Vripple = 0.5Vrms A = curve f = 20Hz to 20kHz PO = 1W 100 60 75 145 24 7 60 60 60 70 70 70 100 100 100 0.005 0.1 0.01 0.1 10 80 30 1 2 40 5 Test Condition Min. ±10 20 30 Typ. Max.±40 60 500 +10 +100 Unit V mA nA mV nA W W W W W W % % % % V/µs dB dB µV µV kΩ dB °C 1.5 3.5 70 90 1 3 1.5 3.5 60 80 V V dB mA V V dB

Music Power (RMS) IEC268.3 RULES - ∆t = 1s (*)

d

Total Harmonic Distortion (**)

20Hz to 20kHz

STAND-BY FUNCTION (Ref: -VS or GND) Stand-by on Threshold Stand-by off Threshold Stand-by Attenuation Quiescent Current @ Stand-by Mute on Threshold Mute offThreshold Mute AttenuatIon

MUTE FUNCTION (Ref: -VS or GND)

Note (*): MUSIC POWER CONCEPT MUSIC POWER is 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. Note (**): Tested with optimized Application Board (see fig. 2) Note (***): Limited by themax. allowable current.

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TDA7294
Figure 2: P.C.B. and components layout of the circuit of figure 1. (1:1 scale)

Note: The Stand-by and Mute functions can be referred either to GND or -VS. On the P.C.B. is possible to set both the configuration through the jumper J1.

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TDA7294
APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1) The recommended...