Input filter design criteria for switching regulators usingcurrent-mode programming |
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Authors: | Kohut CR |
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Affiliation: | Rockwell Int., Anaheim, CA; |
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Abstract: | Design criteria are developed for a constant-frequency current-programmed switching DC-to-DC converter with an input filter to ensure stability and prevent performance degradation. The criteria are given in terms of the filter voltage transfer function HS , output admittance Ys, and the y-parameter model of the switching converter. The criteria are listed as four inequalities and illustrated graphically. The criteria may be summarized as follows: assuming a converter that satisfies its loop gain T, line-to-output transfer function Agf , and output impedance Zof requirement is given, an input filter with Hs and Ys can be used to attenuate the noise emissions from the converter without adversely affecting the converter if Hs⩽1 (may be relaxed to 3-6 dB), and Y s is larger than the curves of the graphical illustration, perhaps using 6 dB as a rule-of-thumb minimum separation |
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