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picture1_Technology Pdf 81802 | Classdtutorial


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File: Technology Pdf 81802 | Classdtutorial
class d audio amplifier design class d amplifier introduction theory of class d operation topology comparison gate driver how to drive the gate key parameters in gate drive stage mosfet ...

icon picture PDF Filetype PDF | Posted on 09 Sep 2022 | 3 years ago
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                           Class D Audio Amplifier Design
                                               •  Class D Amplifier Introduction
                                                     Theory of Class D operation, topology comparison
                                               •  Gate Driver
                                                     How to drive the gate, key parameters in gate 
                                                     drive stage
                                               •  MOSFET 
                                                     How to choose, tradeoff relationships, loss calculation
                                               •  Package
                                                     Importance of layout and package, new packaging 
                                                     technology 
                                               •  Design Example
                                                     200W+200W stereo Class D amplifier 
                                                                                www.irf.com
                                                                 Prepared Oct.8 2003 by Jun Honda and Jorge Cerezo
                      Trend in Class D Amplifiers
          • Make it smaller!
             - higher efficiency
             - smaller package
             - Half Bridge
          • Make it sound better!
             - THD improvement
             - fully digitally processed modulator
                                                         www.irf.com
                                   System ÎGate Drive ÎMOSFET ÎDesign Example
                         Traditional Linear Amplifier
                                Feed back
                                                •Vcc
                    •     •            Bias
                          Error amp
                          •
                                                •Vcc
                    Class AB amplifier uses linear regulating transistors to 
                    modulate output voltage. η = 30% at temp rise test condition.
                                                                www.irf.com
                                                   System ÎGate Drive ÎMOSFET ÎDesign Example
                                How a Class D Amplifier Works
                                                             Feed back
                                   Triangle                                              Nch+VCC
                                                                              Level Shift
                  •        •                  COMP            Dead Time                  Nch
                         Error Amp
                           •
                                                                                             -V C C
                                  Class D amplifier uses MOSFETs that are either 
                                  ON or OFF.
                                  PWM technique is used to express analog audio 
                                  signals with ON or OFF states in output devices.
                                                                                             www.irf.com
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...Class d audio amplifier design introduction theory of operation topology comparison gate driver how to drive the key parameters in stage mosfet choose tradeoff relationships loss calculation package importance layout and new packaging technology example w stereo www irf com prepared oct by jun honda jorge cerezo trend amplifiers make it smaller higher efficiency half bridge sound better thd improvement fully digitally processed modulator system igate imosfet idesign traditional linear feed back vcc bias error amp ab uses regulating transistors modulate output voltage at temp rise test condition a works triangle nch level shift comp dead time v c mosfets that are either on or off pwm technique is used express analog signals with states devices...

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