Class D Power Amplifier

Pojačala snage koriste se za pojačanje zvučnog signala male snage. Tranzistori su osnovne komponente pojačala čija je uloga pojačati ulazni signal. U ovom radu opisane su različite klase pojačala, te njihove prednosti i mane. Kao tema ovog rada, detaljnije je opisano pojačalo klase D i objašnjen način rada ove klase pojačala. Opisani su osnovni dijelovi pojačala, te je objašnjeno čemu služe. Objašnjena je pulsno-širinska modulacija jer se na njoj bazira princip rada pojačala klase D. Pomoću programa EasyEDA dizajnirano je pojačalo sa integriranim krugom TPA3122D2 i napravljen je predložak za izradu tiskane pločice. Detaljno je prikazana je izrada tiskane pločice, te su na kraju izvršena mjerenja.Power amplifiers are used for amplifying audio signals of small power. Transistors are the essential part of an amplifier, they amplifiy the audio signal. This paper describes different amplifier classes, their advantages and disadvatnages. Class D amplifier, its main parts and its working principle is described in detail since this is the topic of this paper. The working principle of the amplifier is based on pulse-width modulation which is also explained. Amplifier schematic and pcb layout for TPA3122D2 integrated circuit were designed in a program called EasyEDA. Making of the pcb is described in detail and measurments were done in the end