Tool/software:
I checked TPA3129 evaluation board. We need to use it in sync mode. I have changed R7=100k and R5=16, as result voltage on GVDD=5.9V and GAI/SLAVE=5.07V. In this case amplifier must come to slave mode, when switching frequency must be equal to the frequency value on the SYNC pin (16). Really I watch difference frequency (see attached file) .
Input signal (Green) is 1/1.28uS = 781kHz. Amplifier switching frequency is 5.4 MHz. I tried other resistors R7=100k R5=39K, in this case GAI/SLAVE=4.21V, but switching frequency was not changed.
How implement mode when switching frequency = input SYNC frequency?
Thanks
Sergey
