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TMS320F28027: voltage filtering frequency

Part Number: TMS320F28027

        

Hello, according to the manual, I calculated the voltage filtering frequency and found that it is approximately 388.96 based on capacitance and resistance. However, I found that there is a probability of shutdown when starting and running at this frequency. The official default value of 344.62 can be used to operate normally. Why is this? Must it be matched with hardware?