hi teams:
The customer has a product that uses TI's LM3478, with an input of 4-17V and an output of 5V/0.3A.
Currently, there is a problem that when the input power fluctuates at low frequencies, the inductor L2 will make a noise. The power waveform fluctuates as shown in the figure below,
Please help me see if there are any suggestions for improvement. Thank you.
The current measures taken are as follows:
1: Adding capacitance to the front end and changing the LC circuit have no effect.
2: Cancel resistors R297 and R99, and make the MOS not work. If only one inductor is connected, it will also make a noise.
