TEA2031A.PDF

TEA2031A

COLOR TV EAST-WEST CORRECTION

. BUILD IN FRAME PARABOLA FROM EXTER-

NAL SAW-TOOTH

. KEYSTONE CORRECTION ADJUSTMENT

. LINE SIZE ADJUSTMENT

. LINE DYNAMIC CORRECTION POSSIBILITY

(beam current)

. D CLASS OUTPUT MODULATOR WITH

BUILD IN RECOVERY DIODE

. 50 OR 60Hz OPERATION

. FEW EXTERNAL COMPONENTS

DESCRIPTION

The TEA2031A is intended to ensure frame rate

modulated parabolic and keystone corrections to

the horizontal deflection circuitry of 110 o

DIP8

(Plastic Package)

sets.

The linear frame saw-tooth is applied to appropri-

ate circuitry from which a corresponding parabolic

waveforms is obtained. This waveform is then fed

to a comparator together with the linear line saw-

tooth for comparison. Comparator’s output drives

the output power stage which is capable of sinking

the external coil currents of up to 0.5A.

An internal recovery diode feeds back to the power

supply the coil fly-back current pulses of as high as

0.5A.

color TV

ORDER CODE : TEA2031A

PIN CONNECTIONS

MULTIPLIER INPUT 1

COMPARATOR INPUT 2

1 AND 2 CAN BE INVERTED

MULTIPLIER INPUT 2

MULTIPLIER OUTPUT AND COMPARATOR INPUT 1

CURRENT REFERENCE

POWER SUPPLY

GROUND

OUTPUT

May 1993

1/6

. PARABOLA CORRECTION ADJUSTMENT

. LOW DISSIPATION

TEA2031A

BLOCK DIAGRAM

Line SAW-TOOTH

V CC

+24V

6.8mH

To DIODE

MODULATOR

100k

Comparator

V CC

50 m A

120 m A

K . (I - I )

Multiplier

V REF

i 1

i 2

6.3V

TEA2031A

Frame

SAW-TOOTH

GENERAL DESCRIPTION

The TEA2031A is intended to provide to 110 o color

TV sets a parabolic and keystone frame rate modu-

lated correction in addition to the main horizontal

scanning.

A stable 6.3V internal reference provides current

and voltage references to the whole IC.

Pins 1 and 2 are two symmetrical inputs of an

on-chip multiplier circuit and are internally held at

6.3V reference potential level. Current inputs to

these pins are drawn from external sources via

appropriate resistors. The frame saw-tooth wave-

form which has a peak-to-peak value of around 3

volts and a mean value of about 2.5 volts, supplies

the required current via a series resistor to pin 1.

Likewise, the current to pin 2 is drawn through a

series resistor from an external dc voltage source.

These series resistors can have values of around

40k

of 5 volts peak-to-peak at pin 7. This parabola is

symmetrical if the DC current flowing into pin 2 is

equal to the mean input current of pin 1. Otherwise,

the parabola becomes dissymmetrical and pro-

duces a keystone effect correction.

The line saw-tooth at pin 8 is obtained by feeding

the line fly-back voltage through an integrator net-

work formed by a diode and a grounded capacitor

(see typical application diagram). The DC compo-

nent of the line saw-tooth is compensated by an

internal current sinking source ; so that the mean

DC values of line saw-tooth and frame parabola

voltages are equal.

Line saw-tooth and frame parabola signals are

applied to a comparator whose output is in the form

of width modulated pulses. During every pulse

duration, the output (pin 5) can sink external coil

currents of up to 0.5A associated with diode modu-

lator of the main horizontal scanning circuit.

An internal recovery diode feeds back the fly-back

energy of the coil to the power supply. This diode

can carry currents of up to 0.5A.

modulation current.

Pin 7 should be loaded to ground through a 100k

resistor which as a result will produce a parabola

2/6

resulting in input currents of approximately

0.1mA

TEA2031A

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V 6–4

Supply Voltage

I 5–4

Output Sink Current

0.5

I 5–6

Diode Output Current

0.5

I 1 and I 2

Input Current

– 0.5

P to t

Power Dissipation

0.8

T stg

Storage Temperature Range

– 20 to 150

I 5–4

Non Repetitive Peak Current on Output Transistor

1.5

I 5–6

Non Repetitive Peak Current on Output Diode

1.5

THERMAL DATA (T amb =+ 50 ° C)

Symbol

Parameter

Value

Unit

R TH (j-a)

Junction-ambient Thermal Resistance

C/W

ELECTRICAL OPERATING CHARACTERISTICS

Symbol

Parameter

Min. Typ. Max. Unit

V 6–4

Supply Voltage

I 6

Supply Current (R (3-4) = 22k

;I OUT =0)

No Load Consumption (R (3-4) = 22k

; OUT =0;V (6-4) = 24V)

100

150

V 3–4

Voltage Reference (R (3-4) = 22k

)

5.9

6.3

6.7

I 1 mean

Frame Saw-tooth Input DC Mean Current

R 1 = 39k

0.1

at 2.5V Mean - saw-tooth Voltage

I 1pp

Frame Saw-tooth Input Peak-to-peak Current

R 1 = 39k

at 2.5V Mean - saw-tooth Voltage

I 2

Keystone Correction Input DC Current

If I 1 Mean = I 2 : No Keystone Effect. R 2 = 39k

0.1

at 2.5V DC ref.

I 2

Keystone Correction Input DC Current for Maximum Keystone Effect

12.5

V 7H

Top Parabola Voltage (2V < V 1 =V 2 < 3V)

V 7H

Top parabola temperature drift

0.5 mV/

SYMMETRICAL PARABOLA FOR NO KEYSTONE EFFECT (see Figure 2)

V 7H –V 7L Parabola Amplitude (V 2 = 2.5V ; V 1 mean = 2.5V, V 1pp = 3V)

3.5

5.2

(V 7H –V 7L ) Parabola amplitude drift versus temperature

mV/

V 7L1

V 7H - V 7L2

Symmetry

0.8

1.2

MAXIMUM DISSYMMETRICAL PARABOLA FOR MAXIMUM KEYSTONE EFFECT (see Figure 3)

V 7H –V 7B Parabola Amplitude (V 2 =2VorV 2 =3V;V 1 mean = 2.5V ; V 1pp = 3V)

5.3

8.5

9.2

V 7H

V 7B

Parabola Amplitude Ratio

2.6

4.1

V 7H

V 7A

DIFFERENTIAL AMPLIFIER

Input 8 Sink Current Source

0.04

0.06

I 8 =F(

) Input 8 Current Drift Versus Temperature

0.1

Transfer Characteristics (pins 7-8) (F = 1MHz)

500 mA/mV

Input Noise (pins 7-8)

Rise and Fall Time (louput = 250mA)

V 5–4

Output Saturation Voltage to Ground (I 5 = 0.5 A)

1.2

V 6–5

Output Saturation Voltage to V CC (I 5 = 0.1A)

V 5–6

Output Diode Direct Voltage (I 5 = + 0.5A)

1.2

3/6

V 7H

TEA2031A

PARABOLA OUTPUT

FIGURE 1

V 1

2.5V

10ms

20ms

FIGURE 2

V 7

V 7H

2 =

= 2.5V

V MEAN

V 7L V 7L1

V 7L2

10ms

FIGURE 3

V 7

V 7H

V 7A

V 2 =3V

V MEAN

V 7B

V 2

=2V

10ms

PARABOLA TEST DIAGRAM

V CC

24V

100k

TEA2031A

39k

22k

V 1

V 2

4/6

TEA2031A

TYPICAL APPLICATION

LINE

FLY-BACK

200V

22nF

22k

100k W

33k W

1M W

E-W CORREC TION

EFFIC IENCY (FEED-BACK)

1N4148

6.3mH

LINE SIZE

ADJUSTM ENT

4.7k

V CC

24V

To DIODE

MODULAT OR

1.8nF

TEA2031A

39k

22k

+3.8V

+2.5V

I REFERENC E

+1.2V

TYPIC AL FRAME SAW-TOOTH

KE YSTONE

AD JUSTMENT

5/6

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