Some times ago I tested the TPA3255 amplifier.TPA3255 works in PBTL mode,supply voltage is 50.15V,signal frequency is 7.5kHz, load impedance is 2 ohms pure resistance,TPA3255 output voltage is 31.8V RMS,so output power up to 505W. And then i tested the waveforms of the TPA3255 power output pins OUTA and OUTB. The details are shown in the figure below. Blue and green are the waveforms at the OUTA and OUTB pins,Yellow is the waveform at the load end。As far as I understand, the waveforms at OUTA and OUTB should be completely inverted,but the actual waveform is not like this. As shown in the picture, OUTA and OUTB will simultaneously go high at a certain moment。Then, will the MOSFETs of the upper and lower arm inside the TPA3255 be turned on at the same time?Will this damage the internal MOSFETs? Hope your help.
Thansk