TDA2653A Просмотр технического описания (PDF) - Philips Electronics

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TDA2653A

26 V, vertical deflection circuit

Philips Electronics 

Philips Semiconductors

Vertical deflection circuit

Product specification

TDA2653A

APPLICATION INFORMATION

The function is described against the corresponding pin number

1, 13.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

Oscillator

The oscillator frequency is determined by a potentiometer at pin 1 and a capacitor at pin 13.

Sync input/blanking output

Combination of sync input and blanking output. The oscillator has to be synchronized by a positive-going

pulse between 1 and 12 V. The integrated frequency detector delivers a switching level at pin 12.

The blanking pulse amplitude is 20 V with a load of 1 mA.

Sawtooth generator output

The sawtooth signal is fed via a buffer stage to pin 3. It delivers the signal which is used for linearity control,

and drive of the preamplifier. The sawtooth is applied via a shaping network to pin 11 (linearity) and via a

resistor to pin 4 (preamplifier).

Preamplifier input

The DC voltage is proportional to the output voltage (DC feedback). The AC voltage is proportional to the

sum of the buffered sawtooth voltage at pin 3 and the voltage, with opposite polarity, at the feedback

resistor (AC feedback).

Positive supply of output stage

This supply is obtained from the flyback generator. An electrolytic capacitor between pins 7 and 5, and a

diode between pins 5 and 9 have to be connected for proper operation of the flyback generator.

Output of class-B power stage

The vertical deflection coil is connected to this pin, via a series connection of a coupling capacitor and a

feedback resistor, to ground.

Flyback generator output

An electrolytic capacitor has to be connected between pins 7 and 5 to complete the flyback generator.

Negative supply (ground)

Negative supply of output stage and small signal part.

Positive supply

The supply voltage at this pin is used to supply the flyback generator, voltage stabilizer, blanking pulse

generator and buffer stage.

Reference voltage of preamplifier

External adjustment and decoupling of reference voltage of the preamplifier.

Sawtooth capacitor

This sawtooth capacitor has been split to realize linearity control.

50 Hz/60 Hz switching level

This pin delivers a LOW voltage level for 50 Hz and a HIGH voltage level for 60 Hz. The amplitudes of the

sawtooth signals can be made equal for 50 Hz and 60 Hz with these levels.

January 1991

7

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