TEA2029 Ver la hoja de datos (PDF) - STMicroelectronics

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TEA2029

APPLICATION NOTE

STMicroelectronics 

TEA2028 - TEA2029 APPLICATION NOTE

VIII.6.3 - Frame safety

In case of failure in the loop, the thyristor may

remain turned-off while the inverse parallel-con-

nected diode conducts. This will result in a haz-

ardeous situation where the voltage across the

coupling capacitor ”CP” will reach an excessively

high value.

To avoid such situation, the voltage at point (a)

should be applied to the ”Safety” input Pin 28 after

it has gone through the matching network ”R4, R5”.

VIII.7 - Frame Scanning in Class B with Flyback Generator

VIII.7.1 - Application diagram

Figure 92

TEA2029C

200V (Pin 14)

+24V

1N4001

100µF

5

TEA2029C

4

2

6

7

3

TDA8172

5

1

4

+12V

1

2

N.C.

10kΩ

3

15nF 10kΩ

Frame Sawtooth

150kΩ

680kΩ

470kΩ

15kΩ

Frame

Yoke

32mH

15Ω

0.7App

Vertical

Phase

Shift

Vertical Amplitude

Adjust

45/46

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