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UCC25600 8-Pin LLC Controller for dianyuan wang seminar
Resonant Half Bridge LLC Controller enhance slim Digital TV design 蒋怀刚 德州仪器技术应用工程师 Owen Jiang Oct 31 2008 Agenda Introduction to LLC resonant converter Step by step design method Other design issues for LLC resonant converter TI 8 pin LLC controller introduction Application example –300W slim digital TV power solution Design Challenges for DC/DC Higher power density Higher efficiency, smaller heat sink Higher switching frequency, smaller magnetics Less energy storage capacitors, smaller size Holdup time requirement Large energy storage capacitor Higher cost Large size Holdup Time Requirement PWM Converter with Wide Operation Range LLC Resonant Converter with Wide Operation Range Operation Principles At Resonant Frequency Operation Principle Below Resonant Frequency Operation Principle Above Resonant Frequency Benefits of LLC Resonant Converter Design Goals for LLC Resonant Converter Impacts of Circuit Parameters Choice of Lm Criteria 1: Primary RMS Current at Normal Operation Choice of Lm Criteria 2: Secondary RMS Current Choice of Lm Criteria 3: Zero Voltage Switching Trade-off Design of Dead Time Trade-off Design of Dead Time Achievable Peak Gain for Different Ln and Q Peak Gains for Different Designs Start Up Current Consideration Design Flow Chart for LLC Resonant Converter Other Design Issues Asymmetrical LLC Other Design Issues Over Current Protection LLC Summary UCC25600 Key Features UCC25600 LLC controller Application Circuit Slim 300W DTV design Interleave transition mode PFC UCC28061 Performance and BOM cost Summary TI 8 Pin Resonant Half Bridge Controller provides simple and reliable solution for resonant half bridge converter, including 3% accurate switching frequency Programmable max. min. switching frequency Programmable dead time Soft start with easy ON/OFF control Over current protection VCC UVLO and over voltage protection Integrated gate driver Provides system cost reduction through less external component and easy layout Thank you Pr
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