TDA8215B Datasheet TDA8215B | P7-P9

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TDA8215B

GENERAL DESCRIPTION

The TDA8215B 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 darlington

drive

– A line phase detector and a voltage control

oscillator

– A super sandcastle generator

– Video identification output.

The slice level of sync-separation is fixed by value

of the external resistors R1 and R2. VR is an inter-

nally fixed voltage.

The sync-pulse allows the discharge of the capac-

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

to discharge the capacitor under V

/2. A frame

sync-pulse permits the complete discharge of the

capacitor, so during the frame sync-pulse Q

and

provide current for the other parts of the circuit.

Figure 4. Synchronization Separator Circuit

Figure 5. Frame Separator

SL1 SL2

Video

ST2ST1

SL1

TDA8215B

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Figure 6. Line Oscillator

The oscillator thresholds are internally fixed by re-

sistors. The discharge of the capacitor depends on

the internal resistor R4. The control voltage is ap-

plied on resistor R5. The sync-pulse drives the

current in the comparator. The line flyback inte-

grated by the external net work gives on pin 13 a

saw tooth, the DC offset of this saw tooth is fixed

by VC. The comparator output provides a positive

current for the part of the signal on pin 13 greater

than to VC and a negative current for the other

part.When the line flyback and the video signal are

synchronized, the output of the comparator is an

alternatively negative and positive current. The

frame sync-pulse inhibits the comparator to pre-

vent frequency drift of the line oscillator on the

frame beginning.

Figure 7. Phase Comparator

CC1

Phase

comparator

output

Line

Flyback

Integrated

Flyback

Sinc pulse

Output

Current

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TDA8215B

Figure 8. Line output (Pin 17)

It is an open-collector output. The output negative

pulse time is 22µs for a 64µs period.

The oscillator thresholds are internally fixed by re-

sistors. The oscillator is synchronized during the

last half free run period. The input current during

the charge of the capacitor is less than 100nA.

Figure 9. Frame Oscillator

Frame output amplifier

This amplifier is able to drive directly the frame

yoke. Its output is short circuit and overload pro-

tected; it contains also a thermal protection.

The frame blanking is detected by the frame fly-

back generator. When the output voltage of the

frame amplifier exceeds V

CC2

-2V

, the pulse is

detected. The line flyback detection is provided by

a comparator which compares the input line fly-

back pulse to an internal reference. The burst gate

pulse position is fixed by the external RC network

(Pin 14). It is referenced to the middle of the line

flyback.

This stage will detect the coincidence between the

line sync pulse (if present) and a 2µs sampling

pulse. This 2µs pulse is positioned at the center of

line sync pulse when the phase loop is locked.

This sampled detection is stored by an external

capacitor Pin 8.

The identification output level is high when video

signal is present.

Important remark: minimum saw-tooth amplitude

on Pin 13 has to be 2V

(typ.: 2.5V

CC1

ST1

SL2

CC1

To frame amplifier

Frame

sync pulse

INPUT CURRENT

COMPENSATION

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15

TDA8215B

Mfr. #:

Buy TDA8215B

Manufacturer:

STMicroelectronics

Description:

Plasma Drivers Deflection Circuit Sandcastl Gen Vid ID

Lifecycle:

New from this manufacturer.

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TDA8215B