TDA9106 datasheet(22/30 Pages) STMICROELECTRONICS

22 / 30 page

H-DRIVE

VCC

H-DRIVE

VCC

Figure 16 : Output stage simplified diagram,

showing the two possibilities of

connection

The maximum output current is 20mA, and the

correspondingvoltagedrop of theoutput darlington

is 1.1V typically.

It is evident that the power scanning transistor

cannot be directly driven by the integrated circuit.

LOGIC

BLOCK

HORIZONTAL

OUTPUT

INHIBITION

VERTICAL

OUTPUT

INHIBITION

VERTICAL

BLANKING

OUTPUT

Horizontal Flyback

0.7V

XRAY Protection

HORIZONTAL

BLANKING

OUTPUT

CC Checking

CC off or I

C Reset

XRAY

Ref

Vertical Flyback

Vertical Sync

Vertical Sawtooth Retrace

Vertical Unlock

I2C Ramp on/off

I2C Drive on/off

I2C Blanking

I2C Ramp on/off

I2C SFME

Horizontal Unlock

Horizontal Free Running Detection

Vertical Free Running Status

Figure 17 : Safety Functions Block Diagram

OPERATING DESCRIPTION (continued)

An interface has to be designed between the circuit

and the power transistor which can be of bipolar or

MOS type.

II.5 - X-RAY Protection

The activation of the X-Ray protection is obtained

by application of a high level on the X-Ray input

(Pin 15 > 8V). The consequenciesof X-Ray protec-

tion are :

- inhibition of H-Drive output

- activation of horizontal blanking output.

- activation of vertical blanking output.

The reset of this protection is obtained either by

VCC switch off or I

2C resetby MCU (see Figure 17).

II.6 - Horizontal Dynamic Focus

TDA9106 delivers an horizontal parabola wave

form on Pin 17. This parabola is performed from a

sawtoothin phase with flyback pulse.Thissawtooth

is present on Pin 16 where the horizontal focus

capacitor is the same as C0 to obtain a controlled

amplitude (from 2 to 4.7V typically).

Symmetry (keystone) and amplitude areI

2C adjust-

able (see Figure 18).This signal has to be con-

nected to the CRT focusing grids and mixed with

vertical dynamic focus.

TDA9106

22/30

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