TEA2028 datasheet(4/47 Pages) STMICROELECTRONICS

4 / 47 page

II - MAIN FUNCTIONS

- Detection and extraction of line and frame syn-

chronization pulses from the composite video

signal.

- Horizontal scanning control and synchronization

by two phase-locked loop devices.

- Video identification.

- 50 or 60Hz standard recognition for vertical scan-

ning.

- Generation of a self-synchronized frame saw-

tooth for 50/60Hz standards.

- Line time constant switching for VCR operation

through an input labeled ”VCR” (Video Cassette

Recorder).

- Control and regulation of a primary-connected

switching power supply by on-chip controller de-

vice combining :

• an error amplifier

• a pulse width modulator synchronized on line

frequency

• a start-up and protection system

- Overall TV set protection input

- Frame blanking and super sandcastle output sig-

nals

- Frame blanking safety input for CRT protection in

case of vertical stage failure.

III - PIN CONNECTIONS

Description

Horizontal output monostable capacitor

Frame blanking safety input

Frame saw-tooth output

Frame blanking output

Frame ramp generator

Power ground

MISCELLANEOUS

FUNCTIONS

SYNC

SEPARATOR

HORIZONTAL

TIME BASE

VERTICAL

TIME BASE

HORIZONTAL

POWER AMP.

VERTICAL

POWER AMP.

SMPS

CONTROLLER

TEA2028B

Miscellaneous

Power Supplies

PRIMARY

CONNECTED

SMPS

Miscellaneous

Power Supplies

Mains

Input

Video Signal

UHF

I.F.

SEPARATOR

SOUND

I.F.

PICTURE

I.F.

SOUND

DETECTION

PICTURE

DETECTION

UHF

COLOR

DECODING

Figure 1

Description

SMPS control output

Supply voltage (VCC)

SMPS regulation input

Horizontal output

Super-sandcastle output

Horizontal flyback input

Horizontal saw-tooth generator

Current reference

SMPS soft-start and safety time constant

capacitor

φ2 phase comparator capacitor

(and horizontal phase adjustment)

VCO phase shift network

VCO output

VCO input

Frame sync time constant adjustment capacitor

Substrate Ground

φ1 phase comparator capacitor

VCR switching input

Video and 50/60Hz identification output (Mute)

Video identification capacitor

Horizontal sync detection capacitor

(50% of peak to peak sync level)

Video input

Safety input

Package : DIP28

TEA2028 - TEA2029 APPLICATION NOTE

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