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TEA2029 데이터시트(PDF) 7 Page - STMicroelectronics

부품명 TEA2029
상세설명  APPLICATION NOTE
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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Sync
Level
t S’
VPP
Black
Level
Video
Input
Signal
Composite Sync.
Output Signal
TH
t r
Frame Sync.
Figure 5
V.2.1 - Black level locking
27
CC
V
+
IC + ID
ID = constant
IC
V
N =2V
VS1
VP
V
C27
VPP
C1
-14
VN =2V
IC
Video
Figure 6
The video signal is applied to Pin 27 through the
coupling capacitor ”C27”. Since the sync pulse
amplitude is generally equal to 1/3 of VPP (i.e. 66mV
to 1V) and in order to obtain a good precision of the
black level, the sync pulse should be amplified by
a coefficient of - 14 before being applied to the
comparator ”C1”.
This comparator will charge the ”C27” capacitor as
long as VS1 >VN
⋅ VS1 will stabilize at VN duringthe
line flyback interval ”Tr” if the average charge of
”C27” capacitor is nil for one TH period.
IC/ID is calculated such that the locking occurs at
the middle of the back porch.
0
t
t
VS1
I
C
-5
µA
t S
t r
VS1
VN (2V)
t 1
t r t S
=
2
+ t S
Figure 7
The
∆VS1 producedbyID during the line tracewhich
is : 14
ID
⋅ tA
C27
must be equal to
∆VS1 during the time interval ”t1”,
i.e. : 14
IC
⋅ t1
C27
It follows that :
IC
ID
=
tA
t1
=
TH
− tR
tS
+
tR
− tS
2
substituting TH =64
µs, tr =12 µs, tS =4.7 µs (which
are standard and constant values) into above
equation :
IC
ID
= 6.23V
V.2.1.1 - Application
At IC =5
µA ⇒ ID =31µA
- With C27 = 220nF,
∆VS will be
14
5
⋅ 52
220
= 16mV
which yields 0.8% maximum error in black level
with respect to VN = 2V at the beginning of retrace
time
- Due to transposition on amplifier stage, the black
level voltage on Pin 27 is equal to 2V.
TEA2028 - TEA2029 APPLICATION NOTE
7/46


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