REDUCING_RIPPLE_IN_A_SWITCHING_VOLTAGE_REGULATOR

Published:2009/6/24 5:17:00 Author:May | From:SeekIC

Simple additional circuitry that consists of relatively small components can reduce the output ripple by a factor of about 10. The additional components are indicated by the dashed lines.A current opposing the ripple is injected into the filter capacitor. The essence of the present technique is to inject, into this capacitor, a cur-rent opposite to that which already flows into this capacitor. A small additional winding, L1, in inductor L0 provides transformer coupling to generate the current that opposes the original ripple current. The circuit from L1 through C0 is completed by a small additional extemal inductor L2 and coupling capacitor C1.



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