EVQ7795-R-00A

The EVQ7795-R-00A is an evaluation board designed to demonstrate the capabilities of the MPQ7795-AEC1, an automotive-grade, low-EMI, differential analog input Class-D audio amplifier with digital interface diagnostics. The MPQ7795 can drive a mono speaker in a bridge-tied load (BTL) configuration.

The MPQ7795-AEC1 utilizes a BTL structure capable of delivering 24.5W of power into 4Ω speakers with a 14.4V power supply. MPS’s Class-D audio amplifiers exhibit the high fidelity of Class-AB amplifiers, as well as high efficiency.

The selectable switching frequency (f_SW) can be set to 330kHz, 384kHz, 470kHz, or 2.2MHz. The MPQ7795-AEC1’s efficiency exceeds 90% during both 470kHz and 2.2MHz operation.

The MPQ7795-AEC1 integrates a load diagnostic function that detects open loads, short loads, load-to-GND shorts, and load-to-PVDD shorts. The diagnostics operate when the device is enabled, which protects the load and the device.

Full protection features include over-current protection (OCP), under-voltage protection (UVP), thermal shutdown, and adjustable power limiting. The adjustable power limit (P_LIMIT) function sets the output peak-to-peak voltage limit (V_{PP_LIMIT}). This is accomplished by limiting the duty cycle to a fixed maximum value. V_{PP_LIMIT} can be considered a virtual voltage rail. The power supply input (PVDD) voltage (V_PVDD) exceeds V_{PP_LIMIT}.

The EVQ7795-R-00A is a fully assembled and tested evaluation board. The MPQ7795-AEC1 is a fully integrated audio amplifier that reduces the solution size. The MPQ7795 is available in a QFN-24 (4mmx4mm) package, and is AEC-Q100 qualified.