TDA9105 datasheet(21/32 Pages) STMICROELECTRONICS

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OPERATING DESCRIPTION (continued)

VERTICAL PART

PARABOLA

GENERATOR

SYNCHRO

OSCILLATOR

OSC

CAP

DISCH.

V_SYNC

POLARITY

SAMPLING

SAMP.

CAP

Vlow

Sawth.

Disch.

REF

TRANSCONDUCTANCE

AMPLIFIER

CHARGE CURRENT

30 VERT_OUT

VERT_AMP

VS_AMP

COR_C

S CORRECTION

C CORRECTION

EW_AMP

EW_OUT

EW_CENT

SPB_AMP

SPB_OUT

SPB_CENT

V_FOCUS

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 used as voltage reference for any DC adjusment

to keep a high accuracy to each adjustment. Its

typical value is :

V26 =VREF = 8V.

The charge of the external capacitor on Pin 27

(VCAP) generates a fixed amplitude ramp between

the internal voltages, VL (VL =VREF/4) and VH

(VH = 5/8

⋅ VREF).

TDA9105

21/32

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