We have a design with TPS566242 that regulates 12V to 3.3V. However, we measured large output ripple/noise at TP6 either with or without load. We also measured the 12V input alone, and the input is clean. The ripple Vpp is up to 1.26V, and the noise is 2-100 MHz. How can we reduce ripple to within 100mV and noise?
Schematic
12V input
3.3V output, no load