TDA9105 ST Microelectronics, TDA9105 Datasheet - Page 21

• Manufacturer Part Number: TDA9105
• Description: DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
• Manufacturer: ST Microelectronics

OPERATING DESCRIPTION (continued)
VERTICAL PART
Figure 21 : Vertical Part Block Diagram
The vertical part generates a fixed amplitude ramp
which can be affected by a S and C correction
shape. Then, the amplitude of this ramp is adjusted
to drive an external power stage.
The internal reference voltage used for the vertical
part is available between Pin 26 and Pin 24. It can
be usedas voltage reference for any DC adjusment
V_SYNC
34
SYNCHRO
POLARITY
PARABOLA
GENERATOR
OSCILLATOR
SPB_CENT
EW_CENT
DISCH.
38
41
SPB_AMP
EW_AMP
39
42
27
37
40
1
OSC
CAP
CHARGE CURRENT
to keep a high accuracy to each adjustment. Its
typical value is :
The charge of the external capacitor on Pin 27
(V
the internal voltages, V
(V
EW_OUT
SPB_OUT
V_FOCUS
CAP
H
= 5/8 V
) generates a fixed amplitude ramp between
SAMPLING
Vlow
REF
).
TRANSCONDUCTANCE
REF
V
Sawth.
Disch.
26
25
= V
SAMP.
CAP
VERT_AMP
AMPLIFIER
REF
L
31
(V
= 8V.
S CORRECTION
C CORRECTION
L
28
29
30 VERT_OUT
= V
VS_AMP
COR_C
REF
/4) and V
TDA9105
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H