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Class D Output Power Estimation

This resource provides methodologies for estimating the output power of Class D amplifiers, crucial for audio applications. It discusses how various impedances, including load and internal circuit impedances, impact efficiency and output power. The document presents simple and accurate calculation techniques to ensure that the internal impedances—such as power supply impedance and MOSFET turn-on resistance—are minimized relative to the load impedance. Understanding these factors is essential for optimizing amplifier performance in audio systems.

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Class D Output Power Estimation

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  1. Class D Output Power Estimation Audio Group Applications

  2. TI Widgets - http://www.ti.com/general/docs/gencontent.tsp?contentId=45777&DCMP=TI_Gadgets&HQS=Other+OT+widgets

  3. Output Power Estimation of Class D Amplifier • Simple Calculation:

  4. APA Circuit Impedances • Audio power amplifier circuits includes many other impedances than load (Speaker). The voltage on the load is reduced due to these impedances. • Power supply internal impedance, trance impedance, MOSFET turn on resistance and inductor DC resistance must be small compared to load impedance to maintain efficiency and output power.

  5. Output Power Estimation of Class D Amplifier • Simple Calculation: • Accurate Calculation:

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