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TEA2028 Datasheet(PDF) 2 Page - STMicroelectronics

Part # TEA2028
Description  APPLICATION NOTE
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA2028 Datasheet(HTML) 2 Page - STMicroelectronics

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V.4
LINE SAW-TOOTH GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . ... ... ... .... ...
18
V.5
SECOND PHASE LOCKED LOOP ”
φ2” . . ... ... .. .. ... ... .... . . . . . . . . . . . . ...
19
V.5.1
Duty of Different Building Blocks. . . . . ... ... ... .... ... ... ... ... ... ... .... ...
20
V.5.1.1
”
φ2” phase comparator . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
20
V.5.1.2
Low-pass filter . . . . .... ... ... .. ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . .
20
V.5.1.3
Phase modulator . . . . . . . . . . . . . . .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
20
V.5.1.4
Flip-flop . . . . . . .... .. . . . . . . . . . . . . . . . . ... .... ... ... ... ... ... ... .... ...
20
V.5.1.5
Output stage . . . . . . . . . . . . . . . . . .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
20
V.5.1.6
Line deflection stage . . . . . . . . . . . .... ... . . . . .. . . . . . . .... .. . . . . . . . . . . . . . .
20
V.5.2
Operation of Building Blocks . . . . . . . .... ... ... .... ... ... ... ... .... . . . . . . ...
20
V.5.2.1
Phase comparator ”
φ2” ... . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
20
V.5.2.2
Low-pass filter f(p). .... .. . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
21
V.5.2.3
Phase modulator . . . . . . . . . . . . . . .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
21
V.5.2.4
Line flip-flop (TEA2028 only) . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
21
a. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
22
b. T10 Calculation . .... ... ... .. .... ... ... . . . . . . .... ... .. . . . . . . . . . . . . . .
22
c. 16ms Window . . . . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
22
d. Auto-set to ”1” . . . . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... .... . . . ...
22
e. Maximum ”T10” value as a function of ”C1” . . . . .... ... ... . . . . . . . . . . . . ....
22
V.5.2.5
Line output stage & inhibitions . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
22
a. Inhibition at start-up. . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
23
b. Inhibition during line flyback . . . . . . . . . . . . . .... ... .. . . .. ... ... ... .... ...
23
c. Safety inhibition . . . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
23
V.5.2.6
Line deflection stage . . . . . . . . . . . .... ... . . . . .. . . . . . . .... .. . . . . . . . . . . . . . .
23
V.5.3
Characteristics of Loop ”
φ2” . .... .. .... ... .... .. . . . . . . .... .. . . . . . . . . . . . . . .
25
V.5.3.1
Study of the static error . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
25
a. Phase shift error in case of no adjustment . . .... ... ... ... ... ... ... .... ...
25
b. Study of shift adjustment . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
26
V.6
VERTICAL DEFLECTION DRIVER STAGE . . . . . . . . . . . . . . .... .. . . . . . . . ... . . . .
26
V.6.1
Frame Sync Extraction . . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
27
V.6.2
Frame Saw-tooth Generator . .... .. .... ... .... .. . . . . . . .... .. . . . . . . . . . . . . . .
27
V.6.2.1
60Hz standard switching . . . . . . . . .... .... . . . . . . . . . . . .... .. . . . . . . . ... . . . .
28
V.6.3
Functions of Frame Logic Block . . . . .... ... . . . . .. . . . . . . .... .. . . . . . . . . . . . . . .
28
V.6.3.1
50/60Hz standard recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . ... ... ... .... ...
29
a. 50Hz Standard Recognition . . . .... .... . . . . . . . . . . . .... .. . . . . . . . . . . . . . .
29
b. 60Hz Standard Recognition . . . .... .... . . . . . . . . . . . .... .. . . . . . . . . . . . . . .
29
V.6.3.2
Vertical synchronization window - Free-running period. .... ... ... .... . . . . . . ...
29
V.6.3.3
Frame blanking signal . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... .... ...
30
V.6.3.4
Frame blanking safety (TEA2028 only) . . . . . . . .... ... ... ... ... ... ... .... ...
30
V.7
SWITCHING POWER SUPPLY DRIVER STAGE . . . . . . . . . . . . . ... ... ... ... . . . .
31
V.7.1
Power Supply Block Diagram . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
31
V.7.2
General Operating Principles . . . . . . .... .... . . . . . . . . . . . .... .. . . . . . . . ... . . . .
32
V.7.3
Electrical Characteristics of the Internal Regulation Loop . . . . . . . . ... ... ... .... ...
32
V.7.4
Power Supply Soft-start . . . . . . . . . . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
33
V.7.5
Protection Features. . . . . . . . . . . . . . . ... ... ... .... ... ... ... ... ... ... . . . . ...
34
V.7.6
TV Power Supply in Standby Mode . . . . . . . . . . . .... ... ... ... ... ... ... .... ...
34
V.7.6.1
Regulation by primary controller circuit . . . . . . . .... ... .. . . .. ... ... ... .... ...
34
V.7.6.2
Regulation by TEA2028 . . . . . . . . .... ... .... .. . . . . . . .... .. . . . . . . . . . . . . . .
34
V.8
MISCELLANEOUS FUNCTIONS . . . .... ... ... . . . .... ... ... .. . . . . . . . . . . . . . .
35
V.8.1
Super Sandcastle Signal Generator . .... .... . . . . . . . . . . . .... .. . . . . . . . . . . . . . .
35
V.8.2
Video and 50/60HZ Standard Recognition Output . . . . . . .... ... .. . . . . . . . . . . . . . .
35
VI
TEA2028 APPLICATION DIAGRAM . ... ... ... .... ... ... ... ... ... . . . . . . . ...
36
TEA2028 - TEA2029 APPLICATION NOTE
2/46



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