Discrete Class D Audio Amplifier ICs

Discrete class D amplifiers are integrated circuits (ICs) that use external switching transistors such as MOSFETs or Gallium Nitride (GaN) technology to allow better audio control and higher voltages. Infineon’s range of high-performance discrete class D amplifier solutions included 1, 2, and 4 channel high voltage amplifiers.

Scalable output power with a unified design platform

Infineon’s discrete class D amplifier audio solutions are scalable to various output power levels, simply by replacing the external MOSFETs or CoolGaN™ e-mode HEMTs of the driver-transistor combinations. 

Key parameters for the transistors used in discrete class D amplifier audio applications include on-state resistance (R_DS(on)), gate charge (Q_G), and reverse recovery charge (Q_rr). Our discrete class D amplifier products are specifically suitable for class D audio applications and optimized for these parameters to achieve maximized efficiency, THD, and EMI amplifier performance.

Infineon’s portfolio of discrete class D amplifier solutions includes drivers for 300 W and 500 W applications. Available in analog or pulse width modulation (PWM) inputs, these high voltage, high performance discrete class D amplifiers offer high noise immunity and programmable over-current protection with self-reset function.

The CoolGaN™ 400 V e-mode HEMTs portfolio is specifically built for class D audio requirements, with high performing SMD packages to fully utilize the benefits of gallium nitride.