TV EAST/WEST CORRECTION CIRCUIT
TDA4950
TV EAST/WEST CORRECTION CIRCUIT
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LOW DISSIPATION SQUARE GENERATOR FOR PARABOLIC CURRENT EXTERNA...
Description
TDA4950
TV EAST/WEST CORRECTION CIRCUIT
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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
POWERDIP8 (Th = 0.4mm) (Plastic Package) ORDER CODE : TDA4950
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. PIN CONNECTIONS
KEYSTONE CORRECTION INPUT FRAME SAWTOOTH CURRENT INPUT CURRENT REFERENCE GND
1 2 3 4
8 7 6 5
NON-INVERTING INPUT 100µA CURRENT SINK PARABOLA OUTPUT INVERTING INPUT +VS OUTPUT
October 1998
1/5
4950-01.EPS
TDA4950
BLOCK DIAGRAM
7 8 COMPARATOR AND OUTPUT STAGE 6 Q14 Q15 Q16 Q1 VS - 3 VBE Q2 Q13 Q4 VREF Q13 R2 Q17 Q18 D1 +VS
TDA4950
CURRENT LIMITER
R5 R3 OP2 R6 Q12
R4 5 Q19 OUTPUT
R5 R7 1 OP1 Q5 Q21 R8
Q20
2 IIN Q7 VS - 6 VBE Q6 Q10 Q11 D2 D3 Q8 Q9 Z1 R9 R10 R11 R12 R13 OP3 Q22 4 GND IREF
FULL-WAVE RECTIFIER
PARABOLA NETWORK
CURRENT REFERENCE 3
ABSOLUTE MAXIMUM RATINGS
Symbol VS IS Ptot Tstg, Tj Parameter Supply Voltage Supply Current Power Dissipation at Tamb = 70 °C Storage and Junction Temperature Value 35 500 800 – 25, +150 Unit V mA mW °C
THERMAL DATA
Max. Max.
4950-02.TBL 495...
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