Differential analog input Class-D amplifier with low idle power dissipation

Texas Instruments’ TPA3128D2 devices are stereo efficient, digital amplifier power stage for driving speakers up to 60W/2ohm in PBTL mode. The device has low idle power loss and helps to extend the battery life of Bluetooth/wireless speakers and other battery-powered audio systems. The high efficiency of the device allows it to do 2 × 30W without external heat sink on a dual layer PCB. This device proposed an efficiency boost Mode, which can dynamically reduced the current ripple of the external LC filter and the idle current. The amplifier’s advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences, which is achieved together with an option of either master or slave option, making it possible to synchronize multiple devices. The devices are fully protected against faults with short-circuit protection and thermal protection as well as overvoltage, undervoltage, and DC protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.