TDA8218 datasheet(5/9 Pages) STMICROELECTRONICS

Part #	TDA8218

Description	HORIZONTAL AND VERTICAL DEFLECTION CIRCUIT

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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The TDA8218 performs all the video and power

functions required to provide signals for the line

driver and frame yoke.

It contains:

• A synchronization separator

• An integrated frame separator without external

components

• A saw-tooth generator for the frame

• A power amplifier for direct drive of frame yoke

(short circuit protected)

• An open collector output for the line driver

• A line phase detector and a voltage control os-

cillator

• A super sandcastle generator.

GENERAL DESCRIPTION

20

SL2

SL1

VR

Video

R1

R2

Figure 1 : Synchronization Separator Circuit

Vz

ST2

ST1

I

3I

SL1

Vz /2

Q3

Q4

Figure 2 : Frame Separator

The slice level of sync-separation is fixed by value of the external resistors R1 and R2. VR is an internally

fixed voltage.

The sync-pulse allows the discharge of the capaci-

tor by a 2 x I current. A line sync-pulse is not able

to discharge the capacitor under VZ/2. A frame

sync-pulse permits the complete discharge of the

capacitor, so during the frame sync-pulse Q3 and

Q4 provide current for the other parts of the circuit.

TDA8218

5/9

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