ZHCSHB1B January 2018 – August 2018 TPA3220
PRODUCTION DATA.
TPA3220 has the option of using either AD-Mode or HEAD-Mode PWM modulation scheme. AD mode has continuous switching of the two half bridge outputs in each BTL output channel. Both half bridge outputs are switching in HEAD mode, but with reduced duty cycle for idle operation and while playing small signals. With higher output levels one half bridge stops switching on HEAD mode operation. HEAD benefits both device power loss and EMI performance, where AD mode is considered to have the highest audio performance.
SPACE
Figure 34. AD-Mode Configuration
Figure 35. HEAD-Mode Configuration
Figure 36. AD Mode Output Waveforms, Idle
Figure 37. AD Mode Output Waveforms, High Level Output
Figure 38. AD Mode Speaker Output Signals, Low or and High Level Output
Figure 39. HEAD Mode Output Waveforms, Idle
Figure 40. HEAD Mode Output Waveforms, High Level Output
Figure 41. HEAD Mode Speaker Output Signals, Low Level Output
Figure 42. HEAD Mode Speaker Output Signals, High Level Output