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TPS561300: TPS561300's frequency spread spectrum

Part Number: TPS561300
Other Parts Discussed in Thread: TPS561246,

Tool/software:

Hi,

About the synchronous Step-Down Converter, i want to know the function of frequency spread spectrum.

I want to know how much this feature improves EMI.

The cost of TPS561300 is higher than that of TPS561246.

I wonder if this feature is worth the cost difference.

Thanks.