TEA2029 STMICROELECTRONICS [STMicroelectronics], TEA2029 Datasheet - Page 44

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

TEA2028 - TEA2029 APPLICATION NOTE
Figure 89
VIII.6.1.3 - ”S” Correction circuit in quasi-bridge configuration
Figure 90
The ”S” correction waveform is obtained using the
non-linear ”V
Figure 91
44/46
R
TEA2029C
3
R1
R3
2
DIODE
+V
R2
220
Frame Reference
B
R5
” versus ”I
Sawtooth
V+
2.2k
R4
1
DIODE
100
P2
V
D1
D2
3
IN
2
” characteristics
27k
R
V
TEA2029C
P
R1
R’1
100
V-
V+
3
10k
YOKE
150k
680k
R3
R’3
56k
SWATOOTH
R3
V
R
B
FRAME
M
C
R2
R’2
220k
2
1
of ”D1” and ”D2” diodes.
The signal pre-corrected by ”D1”, ”D2” diodes and
the feed-back signal through ”R5”, are summed at
”A”. The ”S” correction level is determined by the
ratio between ”R4” and ”R5” resistors.
VIII.6.2 - Frame scanning in switched mode
using coupling capacitor (see Figure 91)
The parabolic voltage at (a) is integrated by ”R2,
C2” network and used for ”S” correction.
The ”S” waveform voltage at (b) is added to the
saw-tooth voltage at(c). The ”S” levelis determined
by ”C2, R2, R3” network.
Amplitude
Adjustment
Linearity
Vertical
(b)
Adjust
A
C2
0.1 F
820k
V
Amplitude
OUT
R2
100
Frame
Adjust
YOKE
, R
(a)
M
V
(c)
10
B
C
. I
P1
P
Frame
Y
Yoke
I
Y
R
R4
R5
M
To Safety
Input
R
M
. I
Y