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TEA2031A
COLOR TV EAST-WEST CORRECTION
1/11April 2004
TEA2031ACOLOR TV EAST-WEST CORRECTION
REV. 2
FEATURES SUMMARY BUILD IN FRAME PARABOLA FROM
EXTERNAL SAW-TOOTH PARABOLA CORRECTION ADJUSTMENT 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 LOW DISSIPATION FEW EXTERNAL COMPONENTS
DESCRIPTIONThe TEA2031A is intended to ensure frame rate
modulated parabolic and keystone corrections to
the horizontal deflection circuitry of 110° color TV
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.
Figure 1. Package
TEA2031A
Figure 2. Pin Connections
Figure 3. Block Diagram
GENERAL DESCRIPTIONThe TEA2031A is intended to provide to 110° color
TV sets a parabolic and keystone frame rate mod-
ulated 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 ap-
propriate 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
3/11
TEA2031Athe 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
40kΩ resulting in input currents of approximately
0.1mA ± modulation current.
Pin 7 should be loaded to ground through a 100kΩ
resistor which as a result will produce a parabola
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. Other-
wise, the parabola becomes dissymmetrical and
produces 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 in-
ternal current sinking source ; so that the mean DC
values of line saw-tooth and frame parabola volt-
ages are equal.
Line saw-tooth and frame parabola signals are ap-
plied to a comparator whose output is in the form
of width modulated pulses. During every pulse du-
ration, the output (pin 5) can sink external coil cur-
rents of up to 0.5A associated with diode
modulator 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.
Table 1. Absolute Maximum Ratings
Table 2. Thermal Data(Tamb = + 50°C)
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
TEA2031A
Table 4. SYMMETRICAL PARABOLA FOR NO KEYSTONE EFFECT(see Figure 4)
5/11
TEA2031A
Table 5. MAXIMUM DISSYMMETRICAL PARABOLA FOR MAXIMUM KEYSTONE EFFECT(see Figure 4)
Table 6. DIFFERENTIAL AMPLIFIER
TEA2031A
Figure 4. PARABOLA OUTPUT
Figure 5. PARABOLA TEST DIAGRAM
