hi Chan,
Clarify as below:
TPS54239E do not have audio skip mode
TPS54239 FCCM mode, frequency will keep 600khz at light load, so there is no audio noise issue
www.ti.com/.../tps54239.pdf
Hi Shawn,
We tried with 4.7uF and added capacitors to the dev board to cover the 66 and 88uF as you suggest. As expected the larger capacitance did reduce the ripple a bit but we still have this issue where the IC cannot decide if it should be pulse skipping…