HI-FI integrated amplifier TDA7294-02

The famous European SGS-THOMSON STMicroelectronics company recently launched to mainland China a new
high-power integrated amplifier TDA7294 with an innovative timbre. It eliminates the wide range of linear integrated amplifiers and thick-film integrated amplifiers that have a wide range of timbres. Used in Hi-Fi fields, such as home theaters and active speakers. This device is a 5-pin package, and its appearance is shown in Figure 5-14. The functions of each pin are as follows: ① Pin is the standby terminal; ② Pin is the inverting input terminal; ③ Pin is the non-inverting input terminal; ④ Pin is grounded; ⑤, @, ⑥ pins are empty pins; @ pin is the bootstrap terminal; ⑦ The pin is +Vs (signal processing part) #⑧ pin is ays (signal processing part); @ pin is the standby terminal; ⑩ pin is the mute terminal; ⑩ pin is +v5 (final stage); ⑨ pin is the output terminal; ⑩ The pin is an n (last stage) 6.     The internal circuit design of TDA7294 focuses on timbre. It combines the advantages of bipolar signal processing circuit and power MOS. It has high voltage resistance, low noise, low distortion, and extremely friendly playback timbre . Features such as power; short-circuit current and overheating protection functions make its performance more complete.     The main parameters of TDA7294 are; Vbi (power supply voltage) is ±40V ~ ±40V; lo (output current peak value) is 10A; o (RMS continuous output Power) is 70W when vl -±35v, 80, v.±Z7 V, 40 is 70W; music power (effective value) y=±38r, 8fl is low, V*±29V, 4, When f2 is low, the TDA7294 standard application circuit is shown in Figure 5-15. The closed-loop gain of the circuit in Figure 5-15 is 30dB. Increasing R3 or decreasing R2 can increase the amplifier gain t, otherwise the gain will decrease; R4 and C4 determine the standby time constant. , when the value is large, the waiting on/off time will be increased, otherwise the time will be shortened; R5.R6, C3 determines the mute time constant, when the value is large, the mute time will be extended, otherwise it will be shortened; when the control terminal is connected to low potential, it will be in standby and mute state . When the control terminal is connected to V book, because (R5+ R 6)>R{, pin ⑩ rises to high potential later than pin ⑨, and changes to low potential first during shutdown, which makes the standby and shutdown processes both in a silent state. This ensures that the amplifier switches on and off without noise 6