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TDA4950STPHIN/a777avaiTV EAST/WEST CORRECTION CIRCUIT


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TDA4950
TV EAST/WEST CORRECTION CIRCUIT
1/10May 2004
TDA4950

TV EAST/WEST CORRECTION CIRCUIT
REV. 2
FEATURES SUMMARY
LOW DISSIPATION SQUARE GENERATOR FOR PARABOLIC
CURRENT EXTERNAL KEYSTONE ADJUSTMENT
(symmetry of the parabola) INPUT FOR DYNAMIC FIELD CORRECTION
(beam current change) STATIC PICTURE WIDTH ADJUSTMENT PULSE-WIDTH MODULATOR FINAL STAGE D-CLASS WITH ENERGY
REDELIVERY PARASITIC PARABOLA SUPPRESSION,
DURING FLYBACK TIME OF THE VERTICAL
SAWTOOTH
DESCRIPTION

The TDA4950 is a monolithic integrated circuit in a
8 pin minidip plastic package designed for use in
the east-west pin-cushion correction by driving a
diode modulator in TV and monitor applications.
Figure 1. Package
Figure 2. Pin Connections
TDA4950
Figure 3. Block Diagram
Table 1. Absolute Maximum Ratings
Table 2. Thermal Data
3/10
TDA4950
Table 3. ELECTRICAL CHARACTERISTICS

(Tamb = 25°C VS = 26 V, Vfr = 0, S1 and S2 in "a" position, refer to test circuit unless otherwise specified)
Figure 4. Test Circuit
TDA4950
Figure 5. Parabola Characteristics
CIRCUIT OPERATION

(see the shematic diagram)
A differential amplifier OP1 is driven by a vertical
frequency sawtooth current of ± 33µA which is
produced via anexternal resistor fromthe sawtooth
voltage. The non-inverting input of this amplifier is
connected with a reference voltage corresponding
to the DC level of the sawtooth voltage. This DC
voltage should be adjustable for the keystone cor-
rection. The rectified output current of this amplifi-
er drives the parabola network which provides a
parabolic output current. This output current pro-
duces the corresponding voltage due to the volt-
age drop across the external resistor at pin 7.
If the input is overmodulated (> 40µA) the internal
current is limited to 40µA. This limitation can be
used for suppressing the parasitic parabolic cur-
rent generated during the flyback time of the frame
sawtooth.
A comparator OP2 is driven by the parabolic cur-
rent. The second input of the comparator is con-
nected with a horizontal frequency sawtooth
voltage the DC level of which can be changed by
the external circuitry for the adjustment of the pic-
ture width.
The horizontal frequency pulse-width modulated
output signal drives the final stage. It consists of a
class D push-pull output amplifier that drives, via
an external inductor, the diode modulator.
5/10
TDA4950
Figure 6. Application Circuit with Keystone Correction
TDA4950
Figure 7. P.C. Board and Component Layout of the Circuit of Figure 6
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