The reference design of Class D audio amplifiers (EPC9192) enables the modular design to have high power and efficiency, thus allowing for fully customized and high-performance circuit design.

    EPC announced the launch of the EPC9192 reference design, which enables an excellent, compact and efficient Class D audio amplifier. It leverages the advantages of the 200 V eGaN FET device (EPC2307) in the grounded reference, split dual power supply single-ended (SE) design at a 4Ω load. The output power of each channel reaches 700 W.
    The EPC9192 is an expandable modular design. Its motherboard is equipped with two PWM modulators and two half-bridge power stage sub-boards, enabling a dual-channel amplifier with auxiliary power management and protection functions. This design has high flexibility, enabling users to implement PWM modulators and power stage customization circuits, facilitating the evaluation and comparison of different devices and modulation techniques.

The main features of the EPC9192 reference design include:

    • It provides 700 W of power in a small size (4 in3), including an output filter and a heat sink
    • An auxiliary management power supply for single-channel voltage regulation and 12 V input
    • Dual separation power input, non-regulated type, power stage ± 42V to ± 85V
    • The analog audio interface is either XLR balanced input or RCA unbalanced input
    • It can be configured as two independent SE channels or mono BTL mode
    • Undervoltage, overvoltage, overcurrent and overheat protection
    • The switching frequency is higher than 600 kHz

The performance measurement indicators of EPC9192 include:
    • 700 W@2 Ω - 4 Ω / 350 W@8 Ω / channel
    • Supports BTL mode (1400 W@4 Ω~8 Ω)
    • < 0.005% THD+N, > 120 dB signal-to-noise ratio
    • Background noise: 40 µV
    • Frequency response: 5 Hz - 20 kHz +/- 0.5 dB, regardless of the load
    Alex Lidow, the CEO of EPC, said: "For audio amplifier designers who wish to take advantage of gallium nitride technology, the EPC9192 is an outstanding tool. With its high power density and scalability, it enables designers to achieve rapid prototyping of compact and high-performance Class D audio amplifiers."