STV7778S

STV7778S DEFLECTION PROCESSOR FOR MULTISYNC MONITOR . . . . . . . . . . . . . . . . . . . . . HORIZONTAL DUAL PLL CONCEPT SELF-ADAPTIVE (30 TO 70kHz) X-RAY PROTECTION INPUT DC ADJUSTABLE DUTY-CYCLE INTERNAL 1st PLL LOCK/UNLOCK IDENTIFICATION 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 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 crit...