HALF BRIDGE THREE-LEVEL PULSE WIDTH MODULATION AMPLIFIER, A DRIVING METHOD THEREOF, AND AN AUDIO PROCESSING DEVICE, CAPABLE OF PREVENTING THE DISTORTION DUE TO ASYMMETRY OF A POWER VOLTAGE

摘要

PURPOSE: A half bridge three-level pulse width modulation amplifier, a driving method thereof, and an audio processing device are provided to reduce power consumption by preventing an unnecessary static current.;CONSTITUTION: A prescaling unit(100) provides a scaled signal by scaling an input signal according to a gain value. A PWM(Pulse Width Modulation) generator(300) varies the pulse width of a second level or the pulse width of a first level according to the size of the scaled signal. The PWM generator generates a 3-level pulse width modulation signal with the first level, the second level, and a reference level. An output stage(500) drives the output node connected to one terminal of a load with a first power voltage level, a second power voltage level, or a third power voltage level.;COPYRIGHT KIPO 2011