TEA2029 STMICROELECTRONICS [STMicroelectronics], TEA2029 Datasheet - Page 3

• Manufacturer Part Number: TEA2029
• Description: APPLICATION NOTE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

TEA2029
VII
VII.1
VII.2
VII.3
VII.4
VII.5
VII.6
VII.7
VIII
VIII.1
VIII.2
VIII.3
VIII.4
VIII.5
VIII.6
VIII.6.1 Frame Power in Quasi-bridge Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIII.6.1.1
VIII.6.1.2
VIII.6.1.3
VIII.6.2 Frame Scanning in Switched Mode using Coupling Capacitor . . . . . . . . . . . . . . . . . . . .
VIII.6.3 Frame Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIII.7
VIII.7.1 Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IX
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
- On-chip switching power supply controller syn-
This integrated circuit has been implemented in
bipolar I
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
The main objective is to drive all functions using an
accurate time base generated by a master 500kHz
oscillator.
generation for spot deviation. The video signal is
used for the synchronization of both time bases.
chronized on line frequency.
2
2
).
L technology, and various functions are
TEA2029 : DIFFERENCES WITH TEA2028 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PIN BY PIN DIFFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TEA2029C PIN CONNEXTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FRAME PHASE MODULATOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FRAME BLANKING SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ON-CHIP LINE FLIP-FLOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AGC KEY PULSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
APPLICATION INFORMATION ON FRAME SCANNING
IN SWITCHED MODE (TEA2029 ONLY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FUNDAMENTALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TYPICAL FRAME MODULATOR AND FRAME OUTPUT WAVEFORMS . . . . . . . . . . .
FRAME POWER STAGE WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FRAME FLYBACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FEED-BACK CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FRAME SCANNING IN CLASS B (WITH FLYBACK GENERATOR) . . . . . . . . . . . . . . .
TEA2029 APPLICATION DIAGRAM COMPLETE APPLICATION WITH TEA2164 . . .
Choice of ”R” value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Influence of R3 value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
”S” Correction circuit in quasi-bridge configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
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