Tool/software:
1、Below is our circuit diagram
2、We have some product failures and the output voltage of the DCDC chip is 3.7V.
3、I would like to ask if it is caused by inductor L1. The actual inductor used is 47uH, and the rated current is 1.55A.However, the datasheet of TI recommends 33uH, and whether its rated current must meet 3A, when the actual power consumption of my back end is only 200mA.
4、The GND pin of the chip is connected in series with the magnetic bead PB7, whether it will elevate the GND pin voltage and cause the 1.235 reference voltage inside the feedback pin to decrease, thus pulling down the output voltage to 3.7V.
5、The following is the characteristic curve diagram of the magnetic bead and the voltage waveform diagram between the low voltage negative electrode and the GND of the PCB.
6、Thank you very much！
