TEA2028 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

TEA2028

APPLICATION NOTE

STMicroelectronics 

TEA2028 - TEA2029 APPLICATION NOTE

Figure 89

R1

R2

Frame Reference

3

Sawtooth

R V- R3

2

VIN

C

A

V+

R’1

P2

1

R’2

V+ R’3

VP

Frame

Amplitude

Adjust

Frame

Yoke

IY

P1 R M RM . IY

VOUT

α, RM . IY

VB

VIII.6.1.3 - ”S” Correction circuit in quasi-bridge configuration

Figure 90

TEA2029C

3

2

R1

R2

D1

R4

D2

of ”D1” and ”D2” diodes.

The signal pre-corrected by ”D1”, ”D2” diodes and

the feed-back signal through ”R5”, are summed at

”A”. The ”S” correction level is determined by the

YOKE

ratio between ”R4” and ”R5” resistors.

R

R3

R5

220Ω

2.2kΩ

100Ω

100Ω R M

VB

The ”S” correction waveform is obtained using the

non-linear ”VDIODE” versus ”IDIODE” characteristics

Figure 91

VIII.6.2 - Frame scanning in switched mode

using coupling capacitor (see Figure 91)

The parabolic voltage at (a) is integrated by ”R2,

C2” network and used for ”S” correction.

The ”S” waveform voltage at (b) is added to the

saw-tooth voltage at(c). The ”S” levelis determined

by ”C2, R2, R3” network.

TEA2029C

FRAME

SWATOOTH

1

2

3

27kΩ

150kΩ

+VB

Linearity

Adjustment

10kΩ

220kΩ

YOKE

R3

680kΩ

56kΩ

(b)

R2

820kΩ

C2

0.1µF

Vertical

Amplitude

Adjust

100Ω

(a)

CP

(c)

10Ω

R4

To Safety

Input

R5

44/46

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