TDA8218 查看數據表（PDF） - STMicroelectronics

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TDA8218

HORIZONTAL AND VERTICAL DEFLECTION CIRCUIT

STMicroelectronics 

TDA8218

GENERAL DESCRIPTION

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

Figure 1 : Synchronization Separator Circuit

• 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.

Video

VR

20

R1

R2

SL1 SL2

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

fixed voltage.

Figure 2 : Frame Separator

Vz

I

SL1

3I

Q3

ST1

Vz /2

Q4

ST2

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.

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