TEA2028 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

TEA2028

APPLICATION NOTE

STMicroelectronics 

TEA2028 - TEA2029 APPLICATION NOTE

Figure 1

UHF

UHF

I.F.

SEPARA TOR

Video Signal

SOUND

I.F.

PICTURE

I.F.

SOUND

DETECTION

PICTURE

DETECTION

COLOR

DECODING

Mains

Input

Miscellaneous

Power Supplies

PRIMARY

CONNECTED

SMPS

MISCELLA NEOUS

FUNCTIONS

SYNC

SEPARATOR

VERTICAL

TIME BASE

SMPS

CONTROLLER

TEA2028B

HORIZONTAL

TIME BASE

VERTICAL

POWER AMP.

HORIZONTAL

POWER AMP.

Miscellaneous

Power Supplies

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

Pin

Description

1 Horizontal output monostable capacitor

2 Frame blanking safety input

3 Frame saw-tooth output

4 Frame blanking output

5 Frame ramp generator

6 Power ground

Pin

Description

7 SMPS control output

8 Supply voltage (VCC)

9 SMPS regulation input

10 Horizontal output

11 Super-sandcastle output

12 Horizontal flyback input

13 Horizontal saw-tooth generator

14 Current reference

15 SMPS soft-start and safety time constant

capacitor

16 φ2 phase comparator capacitor

(and horizontal phase adjustment)

17 VCO phase shift network

18 VCO output

19 VCO input

20 Frame sync time constant adjustment capacitor

21 Substrate Ground

22 φ1 phase comparator capacitor

23 VCR switching input

24 Video and 50/60Hz identification output (Mute)

25 Video identification capacitor

26 Horizontal sync detection capacitor

(50% of peak to peak sync level)

27 Video input

28 Safety input

Package : DIP28

4/46

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