TDA9105A View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TDA9105A

DEFLECTION PROCESSOR FOR MULTISYNC MONITORS

STMicroelectronics 

TDA9105A

OPERATING DESCRIPTION (continued)

VERTICAL PART

Figure 22 : Vertical Part Block Diagram

V_SYNC 34

SYNCHRO

POLARITY

DISCH.

OSCILLATOR

PARABOLA

GENERATOR

CHARGE CURRENT

TRANSCONDUCTANCE

AMPLIFIER

27

OSC

CAP

REF

25

SAMPLING

SAMP.

CAP

S CORRECTION

28 VS_AMP

29 COR_C

Vlow

Sawth.

Disch.

C CORRECTION

30 VERT_OUT

31

VERT_AMP

37 EW_OUT

38

23

39

EW_CENT CORNER EW_AMP

40 SPB_OUT

41

42

SPB_CENT SPB_AMP

1 V_FOCUS

The vertical part generates a fixed amplitude ramp

which can be affected by a S and C correction

shape. Then, the amplitudeof thisramp 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 voltagereference 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).

20/31

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