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參數(shù)資料
| 型號(hào)： | TEA2028 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 20/47頁 |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028 |
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V.5.1 - Duty of different building blocks
V.5.1.1 - ”
φ
2” Phase comparator
This block generates a current proportional to the
phasedifferencebetweenthephasereference”
φ2
”
and the middle of the line flyback to be phase-
locked.
V.5.1.2 - Low-pass filter
- Rejectsthe parasiticcomponent”sum ofphases”
- Smoothensthe ”phase difference” component
- Allow ”phase adjustment” bygeneratingan error
withinthe loop
V.5.1.3 - Phasemodulator
Uses the line saw-tooth voltage to convert the
voltagedeliveredbythelow-pass filterintoaphase
correspondingto the line transistor turn-off control
signal.
V.5.1.4 - Flip-flop
Generates the turn-off controlsignalfor a constant
time (fixedby the externalcapacitor), thephase of
which is set by the modulator.
V.5.1.5 - Outputstage
- Deliversthecontrolsignal forlinetransistordriver
- Disablestheoutputduringstart-upandprotection
phases
V.5.1.6 - Line deflectionstage
- Generates the saw-toothcurrent for line yoke
- Generates the high voltage required by picture
tube and other supply voltages
The line flyback information is provided by the
EHT transformer.
V.5.2 - Operation of building blocks
To providean easier understandingof the subject,
the ”
φ2
” loop study will be coveredas a function of
various time intervals and not as a function of
phase.
V.5.2.1 - Phase comparator ”
φ
2”
The operation is identical to that of ”
φ1
” loop.
The V
φ2
signalissued by logic block is phased with
respect to the middle of line sync pulse on Pin 27
and delayed by a 2.6
μ
s interval so as to be at the
middle of blanking time on video cathodes.
The output current component ”2f
H
” is rejected by
the low-passfilter.
V
CC
V
2
i
Constant
Voltage
Filter F(p)
I
550
μ
A
Line
Flyback
(LF)
2
Figure 37
- The average currentis i = 2I
t
T
H
Where :
t = t
IN
- t
OUT
- The conversiongain is therefore:
A=i
T
H
= 17
μ
A/
μ
s
At : I = 550
μ
A and T
H
= 64
μ
s, ”A” will remain
constantsince”I” is amultiple of ”I
REF
” currenton
Pin 14.
t=2I
0.3
μ
s
2.6
μ
s
Videpon
Pin27
Videoon
Cathodes
LF
t
0
-I
+I
i
T
H
t
OUT
t
IN
V
1
V
2
2
Figure 38
TEA2028 - TEA2029APPLICATIONNOTE
20/46
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