Tool/software:
Hi Sir,
My customer is testing TPS51386 on thier product.
They want to eliminate radiation noise at 393.75Mhz and 684.75Mhz. Noise at 684.75Mhz has be limited by using RC snubber at SW pin (1nF+ 10R), but they can't reduce noise at 393.75Mhz. Is there any suggestion about the question? Thanks.
Best regards,
Gary Teng
Hi Gary,
Customers can try to add a differential mode filter between the common mode filter and the input capacitor, which should have a significant improvement on RE. You can also try to connect an Rboot (2.2ohm~5.1ohm) in series with Cboot (C70). It is recommended to choose shielded inductor. Thanks.
Aurora
Hi Aurora,
Customer test TPS51386 (19Vin, 5V6A with load) by using EVM. They add Rboot and Cboot as your suggestion but no effect. They think maybe the 400MHz is by IC rediation. How do you think about that?
Regards,
Gary
