How to Design a Push-Pull Power Amplifier Circuit with Op Amp and current boosting Sziklai BJT Power Transistor is discussed in this electronic power amplifier circuit design example including the analysis of the circuit operation and proper choices of components in this design. For more amplifier example see • Electrical Engineering... . This Push Pull Amplifier is designed with one Op Amp and a complementary pair of PNP-NPN Sziklai and NPN-PNP Sziklai BJT transistor pair (a variant of the Darlington transistor pair). There are also small current-limiting PNP and NPN Bipolar Junction Transistors in this circuit that combined with the current limiting resistors protects the output sensitive and expensive power transistors from burning by limiting the output load current to a predetermined value. The Operational Amplifier in this design is wired in the form of a non-inverting amplifier to provide the desired voltage gain and also the needed negative feedback in this class AB power amplifier circuit. A combination of op amp virtual short, Kirchhoff Circuit Laws (KCL and KVL) and transistor current gain is applied to analyze this amplifier and find the proper choices of circuit components.
1 окт 2024