TDA9102C datasheet(5/7 Pages) STMICROELECTRONICS

Part #	TDA9102C

Description	H/V PROCESSOR FOR TTL V.D.U

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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ELECTRICAL CHARACTERISTICS (continued)

(Tamb = 25

oC, VS = 12V, refer to the test circuits, unless otherwise specified)

Symbol

Parameter

Test conditions

Min.

Typ. Max.

Unit

VERTICAL SECTION

K17

Frequency drift versus supply voltage K17

=

dF .

10

6

dV .

fV

VS = 10.5V to 15.5V

300

ppm

V

1

2

C2

R1

R2

I1

if

C1

C3

R3

3

HOR. SYNC.

ϕ1

HORIZONTAL

OSCILLATOR

V

3L

V3H

VDC

V

DC

V

3L

V (V)

t (s)

VL = 5.2V

= 6.8V

V

H

= 6V

V

= 2V

VLL

1/fv

ts

Technical note 1

fH (nom) = 26.8 kHz

R1 = 6.8k

Ω

R2 = 56 k

Ω

C2 = 1.8 nF

fpull-in = fH (nom)

 V3 − V1  / R2

V1 / R1

= fH (nom)

If

Io

(A)

where: V1 = 3.5V and

V3 - V1 is the control

voltage range.

The voltage at Pin 3 is limited by two clamping

diodes at the voltage V3H and V3L

When the PLL1 is synchronized and perfectly

tuned, V3 = V1.

Remark: The value of C2 influences the horizontal

oscillator free running frequency; it doesn’t effect

the relative pull-in range. If the

horizontal fre-

quency is changed by using R1, the pull-in range

changes accordingly with the formula (A).

Technical note 2

The internal pulse "t5", is generated by the current

generator "I5" charging the external capacitor

"C5", according with the formula (B):

t5

=

C5 . V5

I5

(B), t5 =

TH

12

is recommended.

Technical note 3

K9 = 67.5 degrees/volt represents the slope of the

oscillator charging period of the waveform at

Pin 2:

K9 =

360 x 0.75

4

degree

V

Technical note 4

The second PLL can recover the storage of hori-

zontal output stage maintaining a constant duty

cycle till the trailing edge of the output pulse gets

the trailing edge of the flyback pulse. From this

point on, only the leading edge of the output pulse

will be shifted covering a total phase shift of: 0.30T;

overcoming this value, it will produce a notch in the

output pulse (@ fH = 27kHz).

Technical note 5

The voltage reference at Pin 19 can be used to

polarize the DC operating point of the vertical

booster. This voltage corresponds to the double of

the mean value voltage of the vertical sawtooth at

Pin 13.

Technical note 6

VH

− VL

ts

=

VH

− VLL

1/fV

ts

= (

VH

− VL)

(VH − VLL)

1

fV

=

K14

fV

TDA9102C/T

5/7

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