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STV7778S Datasheet

  • STV7778S

  • DEFLECTION PROCESSOR FOR MULTISYNC MONITOR

  • 11頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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STV7778S
DEFLECTION PROCESSOR FOR MULTISYNC MONITOR
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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
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).
SHRINK42
(Plastic Package)
ORDER CODE :
STV7778S
DESCRIPTION
The STV7778S is a monolithic integrated circuit
assembled in a 42 pins shrunk dual in line plastic
package.
September 1998
1/11

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