Datasheet TEA2028B Specification

TEA2028B

COLOR TV SCANNING AND POWER SUPPLY PROCESSOR

DEFLECTION

.

CERAMIC 500kHz RESONATOR FRE­QUENCYREFERENCE

.

NO LINE AND FRAME OSCILLATOR AD­JUSTMENT REFERENCE

.

DUALPLL FOR LINE DEFLECTION

.

HIGHPERFORMANCE SYNCHRONIZATION

.

SUPERSANDCASTLE OUTPUT

.

FRAMEBLANKING WITH SAFETYCIRCUIT

.

VIDEOIDENTIFICATION CIRCUIT

.

AUTOMATIC 50/60Hz STANDARD IDENTIFI­CATION

.

EXCELLENTINTERLACINGCONTROL

.

SPECIALPATENTED FRAME SYNCHRO DE­VICE FOR VCROPERATION

.

FRAMESAW-TOOTH GENERATOR

SMPSCONTROL

.

ERROR AMPLIFIER AND PHASE MODULA­TOR

.

SYNCHRONIZATION WITH HORIZONTAL
DEFLECTION

.

SECURITY CIRCUIT AND START-UP PROC­ESSOR

.

OUTPUT PULSES ARE SENT TO THE PRI­MARY SMPS IC TEA2261 THROUGH A LOW
COSTSYNCHRO PULSETRANSFORMER

DESCRIPTION

The TEA2028B is a complete (horizontal and ver­tical) deflection processor with secondary to pri­marySMPS control for color TV sets.

DIP28

(Plastic Package)

ORDER CODE : TEA2028B

PINCONNECTIONS

SWITCH MODE POWER SUPPLYOUTPUT

August 1993

LINE MONOSTABLE CAPACITOR

SAFETY FRAME BLANKING INPUT

FRAME SAW-TOOTH OUTPUT

FRAME BLANKINGOUTPUT
FRAME RAMP GENERATOR

GROUND POWER

V

S.M.P.S. INPUT REGULATION

HORIZONTAL OUTPUT

S. SANDCASTLE OUTPUT

HORIZONTAL FLYBACK INPUT

HORIZONTAL SAW-TOOTH

CURRENT REFERENCE

28

1
2
3
4
5
6
7
8

CC

9
10
11
12
13
14

SAFETY INPUT

27

VIDEO INPUT

26

H. SYNCHRO CAPACITOR (tip level)

25

VIDEO IDENTIFICATION CAPACITOR

24

MUTING + 50/60Hz IDENT. OUTPUT

23

V.C.R. INPUT

22

PHASE COMPARATORΦ1 CAPACITOR

21

GROUND SUBSTRAT
FRAME SYNCHRO ADJUSTMENTCAPACITOR

20

V.C.O. INPUT

19

V.C.O. OUTPUT

18

V.C.O. 90° REF.

17

PHASE COMPARATOR Φ2 CAPACITOR

16
15

STARTING AND SAFETY CAPACITOR

2028B-01.EPS

1/9

TEA2028B

BLOCK DIAGRAM

CC

V

503kHz

SUBSTRAT

18

19

2021

GROUND

SUBST

ϕ1 DET

17

VCO 500kHz

16

ϕ2

3.3kΩ

15

1.26V

R

V

REFERENCE

LINE

MONOSTABLE

HORIZONTAL

LOGIC TIMING

14

VOLTAGE

CURRENT

SWITCH ON/OFF

SAFETY CIRCUIT

13

GENERATOR

H. SAWTOOTH

SOFT STARTING

CIRCUIT

12

SUPER

SANDCASTLE

H. OUTPUT

H. INHIBIT

INPUT

FLYBACK

HORIZONTAL

1.26V

R

V

S.M.P.S.

ϕ MODULAT.

S SC OUTPUT

11

109

8

CC

V

OUTPUT

HORIZONTAL

2/9

INPUT

VCR SWITCHING

50/60Hz

MUTING OUTPUT

23 22

24

25

TEA2028B

H. SYNC

VCR

INPUT

SYNCHRO

SYNCHRO

AND FRAME

HORIZONTAL

26

27

ϕ1 INHIBITION TIME

CONSTANT SWITCHING

2µs

VIDEO

IDENTIFICATION

VIDEO INPUT

INPUT

SAFETY

FRAME TIMING

50/60Hz

28

IDENTIFICATION LOGIC

1

1.26V

R

V

LOGIC

SAFETY

AMPLIFIER

FRAME ERROR

2

FRAME

Hz

50/60

FRAME

OUTPUT

SAWTOOTH

SAFETY

BLANKING

7

S.M.P.S.

OUTPUT

6

POWER

GROUND

FRAME

SAFETY

BLANK

FRAME

OUTPUT

5

FRAME

SAWTOOTH

4

FRAME

OUTPUT

3

FRAME

OUTPUT

SAWTOOTH

CC

V

BLANKING

2028B-02.EPS

TEA2028B

GENERALDESCRIPTION
Introduction

This integrated circuit uses I

2

L bipolar technology
and combinesanalogsignalprocessingwithdigital
processing.
Timing signalsareobtainedfrom a voltage-control­ledoscillator(VCO) operatingat500kHzby means
of a cheap ceramic resonator. This avoids the
frequency adjustment normally required with line
and frame oscillators.
A chain of dividers and appropriate logic circuitry
produce very accurately defined sampling pulses
and the necessarytiming signals.

The principalfunctionsimplementedare :

- Horizontalscanning processor.

- Framescanning processor :

B Class Power stage using an external power
amplifier with fly back generator such as the
TDA8170.

- Secondaryswitch mode power regulation.

- The SMPS output synchronize a primary I.C.

TEA2261at the mainspart.

- Thisconceptallows ACTIVESTANDBY facilities.

- Lineand framesynchronizationseparation.

- Dualphase-lockedloop horizontalscanning.

- Highperformanceframeandline synchronization

with interlacing control.

- Videoidentification circuit.

- Supersandcastle.

- Automatic50-60Hz standard identification.

- VCRinput for PLL time constant and frame syn-

chro switching.

- Framesaw-tooth generator.

- Frameblanking output.

- Switchingmoderegulatedpowersupplycompris-

ing erroramplifier and phasemodulator.

- Securitycircuit and start-up processor.

- 500kHzVCO.
The circuit is supplied in a 28 pinDIP case.

= 12V.

V

CC

SynchronizationSeparator

Line synchronizationseparatoris clampedto black
level of input video signal with synchronization
pulse bottom level measurement.
The synchronization pulses are divided centrally
between the black level and the synchronization
pulse bottom level, to improve performance on
videosignals in noiseconditions.

FrameSynchronization

TimeconstantofFrameSeparatorcan be adjusted
by adding a capacitor pin 20.
The frame timing identificationlogic permits auto­matic adaptatio to 50 - 60Hzstandardsor non-in­terlaced video.
An automatic synchronization window width sys-

tem provides:

- fast frame capture (6.7ms wide window),

- good noise immunity (0.4ms narrow window).
The internal generator starts the dischargeof the

saw-tooth generator capacitor so that it is not dis­turbed by line fly-backeffects.
Thanks to the logic control, the beginningof the
charge phase does not dependon any disturbing
effectof the line fly-back.
A32µstimingisautomaticallyappliedonstandardi-
zed transmissions, for perfect interlacing.
In VCR mode, the discharge time is controlled by
an internal monostable independent of the line
frequency and gives a direct frame synchroniza­tion.

HorizontalScanning

Thehorizontalscanningfrequencyisobtainedfrom
the 500kHz VCO.
The circuituses two phase-locked loops (PLL) :
the firstone controlsthe frequency,the secondone
controls the relative phase of the synchronization
and linefly-back signals.

The frequency PLL has two switched time con­stants to provide :

- capture with a short time constant,

- good noise immunity after capture with a long
time constant.

The output pulse has a constant duration of 29µs
(with C(pin 1) = 3.3nF), independentof V

CC

and

delay in switchingoff the scanning transistor.

Video Identification

The horizontal synchronization signal is sampled
by a 2µs pulse within the synchronization pulse.
The signalis integrated by an external capacitor.
The identificationfunction provides three different
levels :

- 0V : no video identification

- 6V : 60Hz video identification

- 12V: 50Hz video identification

This information may be used for timing research
in thecaseoffrequencyorvoltagesynthetizertype
receivers and for audio muting.

SuperSandcastle with 3 levels : burst, line fly­back, frame blanking
In theevent of vertical scanning failure, the frame
blankinglevel goes high to protect the tube.

Frame blanking time (start with reset of frame
divider) is 21 lines.

VCR Input

This provides for continuous use of the shorttime
constantof the first phase-lockedloop(frequency).
In VCR mode, the frame synchronization window
widens out to a search window and there is no
delay of frame fly-back(direct synchronization).

3/9

TEA2028B

FrameSaw-tooth Generator

Thecurrent tochargethe capacitorisautomatically
switched to 60Hz operation to maintain constant
amplitude.

Switch Mode Power Supply(S.M.P.S) Sec-
ondaryto PrimaryRegulation

Thispower supplyusesa differentialerroramplifier
with an internal reference voltage of 1.26V and a
phase modulator operating at the line frequency.
Thepowertransistoristurnedoff bythefallingedge
of thehorizontalsaw-tooth.

The ”soft start” device imposes a very small con­duction angle on starting up, this angle progres­sivelyincreases to its nominal regulation value.
Themaximum conductionanglemay bemonitored
by forcing a voltageon pin 15. This pin may also
be usedfor currentlimitation.

The output pulse is sent to the primary I.C.
TEA2261via a low cost synchro transformer.

ABSOLUTE MAXIMUM RATINGS (limiting values) (T

Symbol Parameter Min. Max. Unit

Supply Voltage (pin 8) 14 V

V

CC

I

24

V

12

I

12

I

10

I

3

I

4

I

7

I

28

V

28

Operating Supply Voltage (pin 8) Starting threshold 13.2 V
Video Identification Current (pin 24) 10 mA
Positive voltage (pin 12) – 5 V
Line retrace current (pin 12) + 10 mA
Line Output Current (pin 10) – 10 40 mA
Frame Saw-tooth Generator (pin 3) 20 mA
Frame Blanking Input Current (pin 4) 100 mA
SMPS Output Current (pin 7) – 40 mA
Safety Input Current (pin 28) 5 mA
Safety Input Voltage (pin 28) V

SecurityCircuit And Start-up Processor

When the security input (pin 28) is at a voltage
below1.26Vthetwooutputsaresimultaneouslycut
off until this voltage reaches the 1.26V threshold
again. In this case the switch mode power supply
is restartedby the ”soft start” system.
If thiscycleis repeatedthreetimes, thetwooutputs
are cut off definitively. To reset the safety logic
circuits, V

must be lower than 3.5V.

CC

This circuit eliminates the risk toswitch off the TV
receiver in the event of a flashaffectingthe tube.
On starting up the horizontal scanning function
comes into operation at V

= 6V. The power

CC

supplythen comesinto operation progressively.
On shuttingdown,the twofunctionsare interrupted
simultaneouslyafter the first line flyback.

Frame Blanking Safety (Pin 2)
The frame blanking safety checks the normal of

frame scanning.
In caseof any problempin 4 and pin 11isat a high
level (frame blanking) in orderto protect the tube.

=25oC unless otherwisenoted)

amb

CC

2028B-01.TBL

THERMALDATA

Symbol Parameter Value Unit

R

th (j-a)

Junction-ambient Thermal Resistance 55 °C/W

ELECTRICAL OPERATING CHARACTERISTICS

=25oC, VCC= 12V (unless otherwisenoted) Pulse duration at 50% ofthe ampifier

T

amb

Symbol Parameter Min. Typ. Max. Unit

I

Supply Current (pin 8) (frame, line and SMPS output without load) 50 80 mA

CC

SYNC SEPARATOR (Pins 26-27)

Positive Video Input AC Coupled (output impedance of signal source < 200Ω) 0.2 1.8 3 V

–I

–I

4/9

Negative Clamping Current (during sync pulse) -25 -40 -55 µA

27

I

Clamping Current 3 6 9 µA

27

Pin for slicing level 0.2V < V
Negative Current 0 -750 -1000 µA

26

I

Positive Current 17 25 36 µA

26

< 2V (50% of sync amplitude)

27pp

2028B-02.TBL

PP

2028B-03.TBL

TEA2028B

ELECTRICAL OPERATINGCHARACTERISTICS (continued)

=25oC, VCC=12V (unless otherwisenoted) Pulse duration at 50% of the ampifier

T

amb

Symbol Parameter Min. Typ. Max. Unit

FRAME SYNCHRO ADJUSTMENT (Pin 20) (V

I

I

High Output Current (V27= 12V) 7.2 µA

20H

Low Output Current (V27= 0V) – 2.8 µA

20L

VCO (Pins 17-18 and 19)

Frequency control range after line divider (ceramic resonator : 503kHz) 15.30 to

PHASE COMPARATOR ϕ 1 (Pin 22)

Output Current Low Loop Gain ± 0.35 ± 0.50 ± 0.65 mA
Output Current High Loop Gain ± 1 ± 1.5 ± 2mA
Window Pulse Width 7 10 13 µs

VCR SWITCHING (Pin 23)

Threshold Voltage VCR Operating 1.7 2.2 2.7 V

I

Input Current (V23=0, VCC= 12V) -0.030 -0.25 -1 mA

23

VIDEO IDENTIFICATION (Pin 24)

V
V
V

Output Saturation Voltage (without videosignal, I24= 3mA) 0.2 0.6 V

24

Output Voltage (with 60Hz video signal, I24= 2.5mA) 5 6.5 7.5 V

24

Output Voltage (with 50Hz video signal, I24=10µA) 11.0 11.5 V

24

VIDEO IDENTIFICATION (Pin 25)

Output Current (charging the capacitor) 0.5 0.75 1 mA

I

25

t

Identification Time (charging the capacitor) 1.3 1.7 2.2 µs

25

V

L

Threshold (voltage changing from lower to higher value) 4 4.5 5 V

25

Hysteresis 350 mV

HYS

H-RAMP GENERATOR (Pin 13)

I

V

I

dis13

Charge Current 185 200 215 µA

ch13

Base Voltage of Saw-tooth 0.5 V

I13

Discharge Current 3.5 7.0 mA

SUPER SANDCASTLE (Pin 11)

V
V

V

Burst key pulse level Output Voltage (I11= – 5mA) 9 V

B11

Line Blanking Pulse Level Output Voltage (I11= – 5mA) 4 4.5 5 V

L11

Frame Blanking Pulse Level Output Voltage (and frame out of function)

BT11

(I

11

= – 5mA)

SUPER SANDCASTLE

T

Delay between middle of synch pulse (Pin 27) and leading edge of burst

B11

key pulse
Duration of burst key pulse 3.7 4 5

T

Delay Between SSC Cutting Level at Pin 12 and Line Blanking Pulse 0.35

O11

Frame Blanking Time (start with resetof frame divider) 21 Line

POSITIVE LINE FLY BACK INPUT (Pin 12)

Delay between middle of synch pulse and middle of line retrace 2.1 2.6 3.1 µs

Threshold for SMPS Safety 1.1 V
V
V

Threshold for Blanking 0.3 V

bI12

Threshold for PLL2 3 V

ϕ12

I

Input Current – 0.4 V < V12<V

12

I

Input Current VbI12 < V12<Vϕ12 -10 µA

12

I

Input Current V

12

ϕ12<V12<VCC

bI12

= 2.5V)

20

16.10

2 2.5 3 V

2.3 3.0 µs

-20 µA

01µA

kHz

2028B-04.TBL

5/9

TEA2028B

ELECTRICAL OPERATINGCHARACTERISTICS (continued)

Symbol Parameter Min. Typ. Max. Unit

PHASE COMPARATOR ϕ 2 (Pin 16)

I
I

LINE OUTPUT (open collector, Fvco = 500KHz) (Pin 10)

t

∆t ϕ 2 Phase Range 15 16 19 µs

FRAME LOGIC

FRAME SAW-TOOTH GENERATOR (Pins3-5)

I

(60) Internal Current Generator(60Hz on) 12 14 16 µA

5

V

FRAME BLANKING SAFETYINPUT (Pin2)

FRAME BLANKING OUTPUT (open collector) - (Pin 4)

SMPS CONTROL INPUT (Pin 9)

SMPS OUTPUT (Pin 7) - No relation between end of SMPS pulse (pin 7) and leading edge of line fly back (pin 12)

V

SAFETY INPUT (Pin 28)

V

Switch-on, Switch-off Processing (Pin 15)

I

ch15

I

ch15

I

dis15

STARTING SUPPLY VOLTAGE (Pin8)

V
V
V

V

CURRENT REFERENCE (Pin 14)

V

ref 14

* Progressive Starting by Decreasing V

Charging Current 0.4 0.6 0.8 mA

16

Delay Between the Edges of ϕ 1 and ϕ 2(f

16

Output Voltage (I
Output Pulse Duration (whenfly-back pulse is with in time t10)

10

(with C (pin 1) = 3.3nF)

= 20mA) 1 1.5 V

10max

= 500kHz) 2.3 µs

VCO

27.5 29 30.5 µs

Free Running Period (with mute signal) 315 Line
Search Window 247 361 Line
50 Hz Window 309 315 Line
60 Hz Window 247 276 Line
VCR Mode Window 247 361 Line

DischargingCurrent 18 55 mA
Starting Level (0 < Is< 10mA) 1 1.26 1.4 V

s

ThresholdVoltage (negative going pulse) 1.15 1.26 1.37 V

Output Saturation Voltage (I

= 5mA) 0.4 V

4

Output Current (low level) 10 mA
Blanking Time 21 Line

I

InputCurrent (V9=V

9

Output Voltage (0 < I7< 20mA) 10 V

7

t

7

tONmax (f

= 500kHz) 26 30 31 µs

VCO

)2µA

ref 14

Output Phase Range 0 t

ThresholdVoltage (V28=V

28

InputCurrent (if V
during the next line retrace)

28<Vref 14

) 1.20 1.26 1.5 V

ref 14

then SMPS and line are switched off

Charging Current (tc=4µs, T = 64µs) 70 130 µA
Ratio charging/discharging 0.8 1 1.2 µA

SMPS* and Line Starting (Pins 7 and 10) 5.25 6.5 V

CC

SMPS Stopping During Line Retrace 5.25 6.5 V

CC

Frame and Line Stopping 5.25 6.5 V

CC

Hysteresis between Switching-on and Switching-off Level 450 mV

Hyst

VoltageReference (R14= 3.32KΩ ± 1%) 1.2 1.26 1.35 V

15

ON max

3 µA

2028B-05.TBL

6/9

TEA2028B

APPLICATION WITH TDA8172 FOR B CLASS FRAME POWERAND TEA2261 FOR SECONDARY
SMPSREGULATION

CC2

V

EHT

OUTPUT

VIDEOIDENTIFICATION

S.S.C

VCR

500kHz

18 19 23 11 24

10

HORIZONTAL

VCO

8

CC

V

2

IL

+

LOGIC

DIVIDER

SYNC.

SEPARAT.

27

CC2

V

4

FRAME

MODULAT.

SUPPLY

SWITCHING

REGUL. POWER

9

TDA8172

VERTICAL

AMPLIFIER

BIAS

3

5287

TEA2028B

YOKE

FRAME

INPUT

SAFETY

+140V

+12V

V+

TEA2261

IN OUT

220V

MAINS

VIDEO

2028B-03.EPS

7/9

TEA2028B

APPLICATION CIRCUIT (with B class frame power)

220Ω

+200V

EHT

TRANSFORMER

CC

V

PP

10 V

LR

+24V

LINE YOKE

47kΩ

Ω

2mH - 2.5

LF

Ω

SAND

SUPER

121314151617

F

µ

100

1kΩ

390

CAST.

VERT.

1000µF

100nF

15kΩ

SHIFT

Ω

1

Ω

100

FRAME AMPLITUDEADJUST

150kΩ

1kΩ

47nF

+140V FROM SMPS

TRANSFORMER

SMPS

OUTPUT

VOLTAGE

1kΩ

1kΩ

ADJUST

CC

V

330Ω

TO TEA2161

470nF

Ω

2.2

100nF

Ω

µH

15

32

0.7App

FRAME YOKE

6

2

33k Ω

13kΩ

FRAME

BLANKING

5

3

TDA8172

7

1nF

150kΩ

OUTPUT

4

1

100kΩ

1nF

FRAME SAWTOOTH

Ω

470k

Ω

680k

µF

100

1N4001

Pin 14

(TEA2028B)

+200V

CC

V

10kΩ

2.7MΩ

+12V

4

5

6

7

8

9

10

11

SAFETYINPUT

2.2k

Ω

8/9

2.2nF

3.3nF

REF

V

3.32k Ω

22nF

TEA2028B

123

1.26V

3.3nF

220nF

INPUT

SAFETY

10kΩ

150pF

470kΩ

CC

V

F

µ

10

470Ω 220Ω

V

18

19

20

21

22

23

SWITCH

24

5.6kΩ

MUTE OUTPUT

50Hz/60Hz

IDENTIFICATION

Ω

1.8k

220Ω

503kHz

1.5nF

CC

GROUND

10pF

VCR

SUBSTRAT

Ω

1k

10µF

CC

V

10nF

26 27 28

25

4.7nF

100nF

V

VIDEO

INPUT

CC

2028B-04.EPS

PACKAGE MECHANICAL DATA

28 PINS- PLASTICDIP

TEA2028B

I

L

E

F

28

114

Dimensions

a1

b

b2

e3

D

e

15

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

a1 0.63 0.025

b 0.45 0.018
b1 0.23 0.31 0.009 0.012
b2 1.27 0.050

D 37.4 1.470
E 15.2 16.68 0.598 0.657

e 2.54 0.100
e3 33.02 1.300

F 14.1 0.555

i 4.445 0.175

L 3.3 0.130

b1

PM-DIP28.EPS

DIP28.TBL

Information furnished is believed to be accurate and reliable. However,SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of suchinformation nor forany infringement of patents or other rights of third parties which may result
from itsuse. No licence is granted by implication or otherwise under anypatent or patent rights ofSGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

Purchase of I

2

I

C Patent.Rights to usethese components in a I2C system, is granted provided that the system conforms to

Australia - Brazil - China - France - Germany - Hong Kong - Italy -Japan - Korea - Malaysia - Malta - Morocco

The Netherlands- Singapore -Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

2

C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips

2

the I

C Standard Specifications as defined by Philips.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

9/9