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TEA2028 Datasheet(PDF) 3 Page - STMicroelectronics |
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TEA2028 Datasheet(HTML) 3 Page - STMicroelectronics |
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3 / 47 page  TEA2029 VII TEA2029 : DIFFERENCES WITH TEA2028 . ... .... ... ... ... ... ... ... .... ... 37 VII.1 GENERAL . . . . . . . . . . . . . . . . . . . . . .... ... ... . . . .... ... ... . . . . . . . . . . . . .... 37 VII.2 PIN BY PIN DIFFERENCES . .... .. .... ... . . . . .. . . . . . . .... .. . . . . . . . . . . . . . . 37 VII.3 TEA2029C PIN CONNEXTIONS . . . . . . . . . . . . . .... ... .. . . . . ... ... ... .... ... 37 VII.4 FRAME PHASE MODULATOR. . . . . . ... ... ... .... ... ... ... ... ... ... .... ... 37 VII.5 FRAME BLANKING SAFETY . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ... 38 VII.6 ON-CHIP LINE FLIP-FLOP. . .... .. . . . . . . . . . . . ... .. . . . . . . . ... ... ... .... .. . 39 VII.7 AGC KEY PULSE . . . .... ... ... .. .... .... . . . . . . . . . . . .... .. . . . . . . . ... . . . . 40 VIII APPLICATION INFORMATION ON FRAME SCANNING IN SWITCHED MODE (TEA2029 ONLY) . . . . . . . .... ... ... ... ... ... ... .... ... 40 VIII.1 FUNDAMENTALS. . . .... ... ... .. .... ... . . . . .. . . . . . . .... .. . . . . . . . . . . . . . . 40 VIII.2 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... ... ... .... .. . 40 VIII.3 TYPICAL FRAME MODULATOR AND FRAME OUTPUT WAVEFORMS . . . . .... ... 41 VIII.4 FRAME POWER STAGE WAVEFORMS . . . . . . . . . . . . . . . . .... .. . . . . . . . ... . . . . 42 VIII.5 FRAME FLYBACK . . . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ... 43 VIII.6 FEED-BACK CIRCUIT . . . . . . . . . . . .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . . 43 VIII.6.1 Frame Power in Quasi-bridge Configuration . . . . . .... ... ... ... ... ... ... .... ... 43 VIII.6.1.1 Choice of ”R” value . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ... 43 VIII.6.1.2 Influence of R3 value. . . . . .... .. . . . . . . . . . . . ... .. . . . . . . . ... ... ... .... .. . 43 VIII.6.1.3 ”S” Correction circuit in quasi-bridge configuration . . . . . . . . . . . . . . . . . . . . .... ... 44 VIII.6.2 Frame Scanning in Switched Mode using Coupling Capacitor . . . . . . . . . . . . . .... ... 44 VIII.6.3 Frame Safety. . . . .... ... .. . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ... 45 VIII.7 FRAME SCANNING IN CLASS B (WITH FLYBACK GENERATOR) . . . . . . . . .... .. . 45 VIII.7.1 Application Diagram . . . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ... 45 IX TEA2029 APPLICATION DIAGRAM COMPLETE APPLICATION WITH TEA2164 ... 46 I - GENERAL DESCRIPTION As depicted in Figure 1, the TEA2028 combines 3 major functions of a TV set as follows : - Horizontal (line) and vertical (frame) time base generation for spot deviation. The video signal is used for the synchronization of both time bases. - On-chip switching power supply controller syn- chronized on line frequency. This integrated circuit has been implemented in bipolar I 2L technology, and various functions are digitally processed. In fact, resorting to logic func- tions has the advantage of working with pure and accurate signals while full benefit is drawn from high integration of logic gates (approx. 110 gates per mm 2). The main objective is to drive all functions using an accurate time base generated by a master 500kHz oscillator. Also, horizontal and vertical time bases, are ob- tained by binary division of reference frequency. This has the advantage of eliminating the 2 adjust- ments which were necessary in former devices. One section of this integrated circuit is designed to drive a switching power supply of recent implemen- tation called ”master-slave”. Switching takes place on the primary side (i.e., directly on mains) of a transformer. The device ensures SMPS Control, Start-up and Protection functions. Control signals go through a small pulse transformer thereby pro- viding full isolation from mains supply. This new approach fully eliminates the bulky mains transformers used in the past. In addition, it offers optimized power consumption and reduction of TV cost-price. TEA2028 - TEA2029 APPLICATION NOTE 3/46 |
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