TDA4950

TDA4950 TV EAST/WEST CORRECTION CIRCUIT . . . . . . . . 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...