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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(yè)數(shù)： | 27/47頁(yè) |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028 |
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Frame
Sync.
Separator
3
5
24
x 1
50/60Hz
Output
Frame
Sawtooth
Frame
Yoke
V
→
I
I
Y
Power
Amplifier
R5
C5
+E
Frame
Sawtooth
Generator
I
60
50/60Hz
Reset
&
≥
1
Frame Logic
Free
Reset
H/2
Reference
Block
Composite
Sync.
I
Y
Top of Picture
Bottom of Picture
t
2
Figure 51 :
BlockDiagram of the Vertical Deflection Stage
V.6.1 - Frame sync extraction
The main duty of this stage is to extract the frame
sync pulses containedin compositesync signal.
I
C
I
D
+
I
C
C
V
C
Frame
Sync.
= 2
μ
A
I
D
+
= 9
μ
A
C = 35pF
I
C
I
C
2.8V
Composite
Sync.
5.6V
2.8V
2
Figure 52 :
Sync. ExtractorBlock Diagram
Two current generators are used to charge and
discharge the integrated capacitor ”C”. The dis-
charge generator(I
C
+ I
D
) isdriven by thecompos-
ite syncsignal.
The
V
C
across capacitor is :
I
D
t
SYNC
C
During frame trace, the capacitor is dischargedat
each line sync pulse thereby generating a
V of
-0.94V with respect to 5.6V and then recovers the
charge by current ”I
C
”. The comparator output re-
mainslow.
The discharge time is 27
μ
s at the first line sync
inversion appliedto comparatorinput. The voltage
”V
C
” then falls from 5.6V to 0.2V and triggers the
comparator ”C
0
” which will deliver a frame sync
pulse when ”V
C
” crossesthe 2.8V level.
The overall arrangementbehavesas an integrator
and will therefore suppress any noise susceptible
to be presenton input signal.
An external capacitor Pin 20 can be added to the
integratedcapacitor C to increase the frame sync
time constant.
V.6.2 - Frame saw-tooth generator
3
5
Frame Sawtooth
Output
R3
2.2k
C5
470nF
R5
2.7M
+
+
+E
(200V)
60Hz
Frame
Reset
(64
μ
s)
FRAMELOGIC
BLOCK
I
60
2
Figure 53
The frame saw-tooth is generated by an external
RC network on Pin 5.
The time constant ”R5
C5” is much higher than
the frame period. Therefore, the generated saw-
tooth is quite linear.
Thenetworkis dischargedbyan internaltransistor,
controlledby the framelogic block.
TEA2028 - TEA2029 APPLICATIONNOTE
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