TEA2028 데이터 시트보기 (PDF) - STMicroelectronics
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TEA2028 Datasheet PDF : 47 Pages
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TEA2028 - TEA2029 APPLICATION NOTE
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 I2L 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 mm2).
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.
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