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APPLICATION NOTE B+ Converter Topologies for Horizontal Deflection and EHT with TDA4855/58. AN96052 Philips Semiconductors B+ Converter Topologies for Horizontal Deflection and EHT Generators. Application Note AN96052 Abstract Several circuits are discussed for use in multi/autosync deflection and EHT generator stages. All examples use the B+ control part of the ASDC TDA4855 or TDA4858. © Philips Electronics N.V. 1997 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. 2 Philips Semiconductors B+ Converter Topologies for Horizontal Deflection and EHT Generators. Application Note AN96052 APPLICATION NOTE B+ Converter Topologies for Horizontal Deflection and EHT with TDA4855/58. AN96052 Author(s): H. Verhees Philips Semiconductors - Systems Laboratory Eindhoven, The Netherlands Keywords B+ control Horizontal deflection EHT Autosync monitor Deflection control Number of pages: 27 Date: 96-09-02 3 Philips Semiconductors B+ Converter Topologies for Horizontal Deflection and EHT Generators. Summary Application Note AN96052 The B+ control section of the ASDC TDA4855/58 can be used with boost, buck and flyback converters in feedback or feedforward mode with current sense or RC sawtooth generator for power supplies of deflection and EHT generators. All circuits have their own specific advantages and application areas. If cost is important, a combination of horizontal deflection and EHT generator is possible with a so called "constant T-on circuit". The performance of this constant T-on can be improved with several options like feed forward, quasi-stabilised EHT and deflection compensation. For higher performance monitors, separate horizontal deflection and EHT generators will become more and more popular. For this part of the market several solutions are presented for both deflection and EHT generators. When EHT and deflection are separated, both circuits need a controller like the B+ part in the TDA4855/58. In this report the controller part itself is not subject of review. Therefor the presented circuits are designed around the TDA4855/58. Where necessary additional circuits are mentioned but not discussed in detail. 4 Philips Semiconductors B+ Converter Topologies for Horizontal Deflection and EHT Generators. CONTENTS Application Note AN96052 1. ABBREVIATIONS AND KEY-WORDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .