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TDA8145
TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES
1/9May 2004
TDA8145TV EAST/WEST CORRECTION CIRCUIT
FOR SQUARE TUBES
REV. 2
FEATURES SUMMARY LOW DISSIPATION SQUARE GENERATOR FOR PARABOLIC
CURRENT SPECIALLY DESIGNED FOR
SQUARE C.R.T. CORRECTION 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
DESCRIPTIONThe TDA8145 is a monolithic integrated circuit in a
8 pin minidip plastic package designed for use in
the square C.R.T. east-west pin-cushion correc-
tion by driving a diode modulator in TV and moni-
tor applications.
Figure 1. Package
Figure 2. Pin Connections (top view)
TDA8145
Figure 3. Schematic Diagram
Table 1. Absolute Maximum Ratings
Table 2. Thermal Data
3/9
TDA8145
Table 3. ELECTRICAL CHARACTERISTICS(Tamb = 25°C, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer to the test circuit unless otherwise
specified)
Figure 4. Test Circuit
TDA8145
Figure 5. Parabola Characteristics
5/9
TDA8145
Figure 6. Application Circuit with Keystone Correction
CIRCUIT OPERATION(see the shematic diagram)
A differential amplifier OP1 is driven by a vertical
frequency sawtooth current of ± 33µA which is
produced via an external resistor fromthe saw-
tooth voltage. The non–inverting input of this am-
plifier is connected with a reference voltage
corresponding to the DC level of the sawtooth volt-
age. This DC voltage should be adjustable for the
keystone correction. The rectified output current of
this amplifier drives the parabola networkwhich
provides a parabolic output current.
This output current produces the corresponding
voltage due to the voltage 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.
TDA8145
PART NUMBERING
Table 4. Order Codes
