TDA7296S

Overview

The TDA7296S is a monolithic Class AB audio amplifier utilizing Multipower BCD technology and a DMOS power stage. It operates within a supply voltage range of ±10V to ±35V, delivering up to 60W music power into 4Ω or 8Ω loads at THD=10%. Key electrical parameters include a closed-loop gain of 26-45dB, quiescent current of 30mA (typical), and input offset voltage of ±10mV. The device features short-circuit protection, thermal shutdown at 150°C, and a clip detector. It is housed in a Multiwatt15 package with through-hole mounting.

Feature Summary

• Integrated mute and stand-by functions driven by CMOS logic compatible inputs to prevent switching transients.
• DMOS power stage architecture providing immunity to secondary breakdown phenomena.
• Modular capability allowing multiple devices to be connected in parallel via pin 11 for low impedance loads.
• Built-in clip detector and comprehensive protection against short circuits and thermal overload.

Applications

• Hi-Fi home stereo systems
• Self-powered loudspeakers
• Top-class television audio output stages

Procurement Notes

Verify component status as the datasheet indicates this product may be obsolete. Confirm availability through authorized distributors or surplus channels. Ensure the Multiwatt15 package matches the PCB footprint requirements. Check for specific ordering suffixes if available from official STMicroelectronics sources to ensure compatibility with existing designs.

Selection Notes

Select this component for high-power single-channel applications requiring robust DMOS performance. Consider the modular parallel configuration if driving very low impedance loads below standard ratings. Ensure adequate heatsinking due to the 50W dissipation rating at 70°C case temperature. Verify that the required closed-loop gain falls within the 26dB to 45dB range defined by external feedback components.

Part Context

The TDA7296S belongs to the TDA729x series of audio amplifiers from STMicroelectronics. It shares the Multiwatt15 package and functional block structure with related models like the TDA7294 and TDA7295. Unlike higher-voltage variants, it is optimized for a ±35V maximum supply range, distinguishing it within the family while maintaining similar protection and control features.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided documentation. Designers should consult STMicroelectronics for current active replacements or verify cross-reference data from official manufacturer channels before substitution.

FAQ

How is the modular parallel operation configured?

One device acts as the master while others act as slaves. Slave SGND pins must be tied to the negative supply, and bootstrap capacitors must be scaled by the number of devices (22μF times N).

What triggers the thermal shutdown sequence?

Thermal shutdown initially mutes the device at a junction temperature of 150°C and then places it into stand-by mode at 160°C.