Abstract
This paper proposes an EMI spread spectrum technology with automatically setting the notch frequency using the pulse coding controlled method of the DC-DC switching converter. In the automatic notch generation method, by usage of the input frequency Fin, the clock frequency Fckand the coding pulses PH, PL are generated automatically using the equation (see formula in the paper). Here the conversion voltage ratio is given by (see formula in the paper) . If shifts, the balance of the inductor current is shifted and then the output voltage ripple is influenced. Moreover, as the power supply IC, it is necessary to automatically detect or set the conditions for Vin and Vout, and hence we also provide discussion about the conversion voltage ratio Do in many situations.
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