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Monolithic Power Systems (MPS) MPQ7795 Audio Amplifiers are automotive-grade, low-EMI, differential analog input Class-D audio amplifiers with I2C diagnostics. These audio amplifiers are fully integrated and can drive a mono speaker in a Bridge-Tied Load (BTL) configuration. Using BTL structure, these amplifiers are capable of delivering 24.5W into 4Ω speakers with a 14.4V power supply (PVDD). The MPQ7795 audio amplifiers use class-D architecture but exhibit the high fidelity and efficiency of Class-AB amplifiers. These audio amplifiers integrate a load diagnostic function that detects open load, short load, load-to-GND short, and load-to-PVDD short conditions. This diagnostic works when the device is enabled, which protects the load and the device. The MPQ7795 audio amplifiers are used in automotive e-call systems, telematics systems, infotainment audio, and cluster systems.
In addition to Over-Current Protection (OCP), Under-Voltage Protection (UVP), and Over-Temperature Protection (OTP), the MPQ7795 amplifiers feature an adjustable power limit (PLIMIT) function. The PLIMIT circuit sets a limit on the output’s peak-to-peak voltage (VPK-PK), which is accomplished by limiting the duty cycle to a fixed maximum value. This limit can be considered a virtual voltage rail, and it is below the supply connected to PVDD.
