Class D stereo amplifier — 115 W per channel into 2 Ω
The Texas Instruments TPA3245DDV is a PurePath™ Class D audio amplifier delivering 115 W per channel into a 2 Ω load in stereo mode, or 230 W into 4 Ω in a single-channel bridged configuration. It operates from a 12 V to 30 V supply rail and is packaged in a 44-HTSSOP with an exposed thermal pad for heat sinking. The part includes depop circuitry to suppress turn-on clicks and integrated short-circuit and thermal protection. Typical applications include powered speakers, soundbars, home theater systems, and commercial audio installations where high efficiency and compact PCB area are priorities.
Output power and supply rail — sizing the BOM
The 115 W x 2 into 2 Ω rating sets the transformer and bulk capacitor requirements for the power supply. At 230 W bridged into 4 Ω, the single-channel output can drive a subwoofer or a high-power mono speaker. The 12 V to 30 V supply range means the same board can be reused across different system voltage rails — a 24 V industrial supply or a 19 V laptop brick both work, but the output power scales with the rail. For a given load impedance, lower supply voltage reduces headroom; at 12 V into 8 Ω the output drops to roughly 30 W per channel (typical for a desktop speaker).
Package and thermal management
Without adequate thermal coupling, the junction temperature rises quickly under continuous high-power output, especially into 2 Ω loads where dissipation is highest.