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TPS54340: How to read a frequency response graph

Part Number: TPS54340

Hi Team,

We can tune system frequency response by Spreadsheet, TPS54360-361FAMILY_CALC_TOOL_REVE though, but I'm not sure which part of the transfer function each GAIN line on the frequency response graph are for.

I can see three line on the graph as below. Could you please explain which part of the transfer function each line represents?

Power Stage Gain : 
Compensation Gain : 
Overall Gain :  

Regards,

Takashi Onawa