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How to Cal. the sense current gain in CM buck?

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Y

ynhe

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Hi:
The paper from TI give the Calculation of sense current gain in Current Mode buck.
Who can tell me how this equation come from?


"Choose Rs/Nt so that the effective peak - to - peak current analog (including ramp) is well above the noise level, e.g. 0.5 volts."

(Rs/Nt)*[D*(Vi+Vo/2)/(fs*L)]

Thanks!
 

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