TEA2028 - TEA2029 APPLICATION NOTE
Figure 89
R1
R2
Frame Reference
3
Sawtooth
R V- R3
2
VIN
C
A
V+
R’1
P2
1
R’2
V+ R’3
VP
Frame
Amplitude
Adjust
Frame
Yoke
IY
P1 R M RM . IY
VOUT
α, RM . IY
VB
VIII.6.1.3 - ”S” Correction circuit in quasi-bridge configuration
Figure 90
TEA2029C
3
2
R1
R2
D1
R4
D2
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
YOKE
ratio between ”R4” and ”R5” resistors.
R
R3
R5
220Ω
2.2kΩ
100Ω
100Ω R M
VB
The ”S” correction waveform is obtained using the
non-linear ”VDIODE” versus ”IDIODE” characteristics
Figure 91
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.
TEA2029C
FRAME
SWATOOTH
1
2
3
27kΩ
150kΩ
+VB
Linearity
Adjustment
10kΩ
220kΩ
YOKE
R3
680kΩ
56kΩ
(b)
R2
820kΩ
C2
0.1µF
Vertical
Amplitude
Adjust
100Ω
(a)
CP
(c)
10Ω
R4
To Safety
Input
R5
44/46