HI-FI integrated amplifier TDA7294-02 circuit

Description: Europe's leading SGS-THOMSON STMicroelectronics recently introduced a new power integrated amplifier, the TDA7294, to the Chinese mainland market. This amplifier, characterized by a cold and hard tone, is particularly suited for Hi-Fi applications such as home theaters and active speakers. The device comes in a 5-pin package, with the pin functions as follows: one pin is for standby; another is for the inverting input; a pin is for the positive input; one pin is grounded; two pins are unused; one pin is the bootstrap; one pin is for the positive supply voltage (+Vs); another pin is for the negative supply voltage (-Vs); one pin is for standby; one pin is for mute; one pin is for the final stage (+V5); and the last pin serves as the output. The TDA7294 features an internal circuit designed to focus on audio tone, utilizing both bipolar signal processing and the power advantages of MOS technology, resulting in high voltage, low noise, and low distortion characteristics, which contribute to excellent sound reproduction. It includes short-circuit current and thermal protection features that enhance its performance. Key parameters include a supply voltage (VBi) of up to 40V, a peak output current (Io) of 10A, and continuous RMS output power (Pout) of 70W at ±35V. The standard application circuit for the TDA7294 is shown in a referenced figure, where the circuit loop gain is set at 30dB. The gain can be adjusted by changing the values of resistors R2 and R3. The standby time constant is determined by R4 and C4, while the mute time constant is set by R5, R6, and C3. When the control terminal is at low potential, the amplifier enters standby and mute states. When the control terminal receives a high potential, the amplifier exits these states, ensuring minimal noise during switching.

The TDA7294 power integrated amplifier is designed to meet the demands of high-fidelity audio applications, providing robust performance with its advanced internal circuitry. The integration of bipolar and MOS technologies allows for superior audio processing capabilities, making it a versatile choice for both consumer and professional audio systems. The amplifier's architecture is optimized for low distortion and high efficiency, enabling it to deliver clear and powerful sound output across a wide frequency range.

In practical applications, the TDA7294 can be employed in various configurations, including bridge mode for increased output power or as part of a multi-channel system. The inclusion of thermal and short-circuit protection enhances the device's reliability, making it suitable for prolonged use in demanding environments. The specified gain settings allow designers to tailor the amplifier's performance to specific audio requirements, ensuring flexibility in system design.

Furthermore, the TDA7294's design considerations, such as the selection of passive components for the standby and mute time constants, offer additional control over the device's operational behavior. This level of customization is essential for achieving optimal performance in different audio scenarios, whether in home theater setups or professional sound reinforcement systems. Overall, the TDA7294 represents a significant advancement in power amplifier technology, delivering exceptional audio quality and performance.Europe's leading SGS-THOMSON STMicroelectronics recently introduced a tone quite new to the Chinese mainland hydrazine fos power integrated amplifier TDA7294, swept past the linear integrated amplifier and thick set successfully released, cold, hard tone t widespread for Hi-Fi areas, such as home theater, active speakers. The device is l 5-pin package, the shape shown in Figure 5-14. Each end of the pin action as follows: O standby pin end; feet to the inverting input; feet for positive input; feet grounded; , @, feet empty legs; @ bootstrap pin end; pin + Vs (signal processing section) # feet for a ys (signal processing section); @ feet standby end; ß feet muted end; ß feet + v5 (final stage); a pin as an output; ß feet for a n (final stage) 6 TDA7294 internal circuit designed to focus on the tone, both bipolar signal processing circuitry and power advantages of MOS, with high pressure, low noise, low distortion, reproducing sounds great affinity and power and other characteristics; short-circuit current and thermal protection features that make it more perfect performance mouth TDA7294 main parameters; V Bi (supply voltage) for the soil lov ~ 40V; lo (output stream peak) to 10A; corpse o (RMS continuous output power) at vl - soil 35v, 80 when 70W, v a Z7 V, 40 when 70W; music power (RMS) y thatch = 38r, as when 8fl.

lOOW, V * a disability 29V, 4, f2 when loow day TDA7294 corpus standard application circuit shown in Figure 5-15, Figure 5-15 circuit loop gain is 30dB, increase or decrease R2 R3 can increase the gain of the amplifier gain decreases and vice versa t; R4, C4 decided standby time constant , while waiting for the big increase in the value of on / off times, whereas shorter time; R5.R6, C3 decide mute time constant, the value of large static sound prolonged, whereas shorter; when the control terminal, a low potential to standby and mute status . When the control termination letter V, because (R5 + R 6) R {, after more than a ß foot foot rises high potential, and the first shutdown goes low, which makes the process both in standby and off static sound state carried out to ensure that the switch noise amplifier.