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AN3180 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN3180 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 39 page ![]() Contents AN3180 2/39 Doc ID 17273 Rev 1 Contents 1 Basic topologies with zero-ripple current . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Zero-ripple current phenomenon: theory . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Sensitivity of zero-ripple current condition . . . . . . . . . . . . . . . . . . . . . 10 4 Zero-ripple current phenomenon: practice . . . . . . . . . . . . . . . . . . . . . . 13 5 Capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 A 200 W ripple-free input current PFC pre-regulator . . . . . . . . . . . . . . 19 7 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Appendix A Electrical equivalent circuit models of coupled inductors and transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Appendix B Measuring transformer and coupled inductor parameters . . . . . . 36 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 |
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