STV7778S

DEFLECTION PROCESSOR FOR MULTISYNC MONITOR

September 1998

SHRINK42

(Plastic Package)

ORDER CODE : STV7778S

HORIZONTAL

.

DUAL PLL CONCEPT

.

SELF-ADAPTIVE (30 TO 70kHz)

.

X-RAY PROTECTION INPUT

.

DC ADJUSTABLE DUTY-CYCLE

.

INTERNAL 1st PLL LOCK/UNLOCK IDENTIFI-

CATION

.

WIDE RANGE DC CONTROLLED H-POSITION

.

ON/OFF SWITCH (FOR PWR MANAGEMENT)

.

TWO H-DRIVE POLARITIES

VERTICAL

.

VERTICAL RAMP GENERATOR

.

45 TO 120Hz AGC LOOP

.

DC CONTROLLED V-AMP, V-POS, S-AMP

AND S-CENTERING

.

ON/OFF SWITCH

B+ REGULATOR

.

INTERNAL PWM

GENERATOR

FOR

B+

CURRENT MODE STEP-UP CONVERTER

.

DC ADJUSTABLE B+ VOLTAGE

.

OUTPUT

PULSES

SYNCHRONISED

ON

HORIZONTAL FREQUENCY

.

INTERNAL MAX CURRENT LIMITATION

EWPCC

.

VERTICAL PARABOLA GENERATOR WITH DC

CONTROLLED KEYSTONE AND AMPLITUDE

GENERAL

.

COMPARED

WITH

THE

STV7778,

THE

STV7778S HAS AN INTERNAL METAL SHIELD

PROTECTION AGAINST OVERVOLTAGE.

.

POS/NEG H AND V SYNC POL

.

SEPARATED H AND V TTL INPUT

.

SAFETY BLANKING OUTPUT

DESCRIPTION

The STV7778S is a monolithic integrated circuit

assembled in a 42 pins shrunk dual in line plastic

package.

The goal of this IC is to control all the functions

related to the horizontal and vertical deflection in a

multimodes or multisync monitor.

As can be seen in the block diagram, the

STV7778S includes the following functions :

- Positive or Negative sync polarities,

- Auto-sync horizontal processing,

- H-PLL lock/unlock identification,

- Auto-sync Vertical processing,

- East/West signal processing block,

- B+ controller,

- Safety blanking output.

An internal metal shield give to the STV7778S more

immunity against electromagnetic and electrostatic

fields, and therefore, additional safety for critical

applications (for example, in case of CRTs with

small coated area).

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