FTM / Power & Power Management / Diodes Incorporated — PAM8965 Audio Amplifier
The PAM8965 Class D stereo audio amplifier from Diodes can drive up to 12 W into two 4 Ω speakers at a high 92% efficiency.
The high efficiency means that the PAM8965 does not require a heat-sink, and helps to extend run-time between charges in battery-powered devices.
The PAM8965 has an integrated synchronous boost converter, making it suitable for use in smart speaker systems and portable musical instruments in which high output power, extended battery run-time, and compact design are all required. By incorporating the synchronous boost converter, the PAM8965 reduces board space requirements and lowers overall bill-of-materials costs.
The spread spectrum modulation (SSM) used in the boost converter results in effective electromagnetic interference suppression across a broad range of frequencies. This allows the device to employ inexpensive ferrite bead filters rather than more costly and bulky LC filters. This further cuts the cost and size of the host system design.
The boost converter uses pulse frequency modulation (PFM) at light loads. To avoid the switching frequency from dropping into the audio band, the boost converter features an out-of-audio mode, which keeps the switching frequency above 75 kHz. This minimizes the risk that audible vibrations from components mounted on the PCB will affect the audio output. In addition, Class-D and boost SSM switching are synchronized to avoid beats.
The PAM8965 uses non-clipping power-limit technology to ensure speakers provide superior audio fidelity without the risk of damage, and a thermal fold-back function reduces output power if the amplifier starts to overheat.
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