Hi expert,
My customer is designing BQ24770 and they are facing EMI problem. Currently they are using 800kHz of Fsw and the EMI result is bad at 73.3M or 73.4MHz.
In this case, Can you review my below questions?
Q1. What would you suggest for the switching frequency at 3.3uH inductor? Is it better to lower or to higher?
Q2. Is it okay to add a snubber at the SW node(before inductor) for BQ24770?
If there's any better idea to reduce EMI, please let me know.
- 4cells(16.8V)
- minimum system voltage: 16.8V
- Adapter voltage: 19V
Thnaks,
Jay