TEA2028 datasheet(44/47 Pages) STMICROELECTRONICS

44 / 47 page

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

The ”S” correction waveform is obtained using the

non-linear ”VDIODE” versus ”IDIODE” characteristics

VIN

V-

V+

R’3

R’2

R’1

V+

Frame Reference

Sawtooth

VOUT

R M

Frame

Amplitude

Adjust

α, RM .IY

RM .IY

Frame

Yoke

Figure 89

220

Ω

2.2k

Ω

100

Ω

100

Ω

R M

YOKE

TEA2029C

Figure 90

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

ratio between ”R4” and ”R5” resistors.

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.

+VB

27k

Ω

FRAME

SWATOOTH

150k

Ω

10k

Ω

680k

Ω

820k

Ω

Linearity

Adjustment

0.1

µF

100

Ω

56k

Ω

Vertical

Amplitude

Adjust

Ω

(c)

(a)

(b)

To Safety

Input

TEA2029C

220k

Ω

YOKE

Figure 91

TEA2028 - TEA2029 APPLICATION NOTE

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