TDA8145

TDA8145 TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES FEATURES SUMMARY ■ LOW DISSIPATION Figure 1. Package ■ 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 POWERDIP8 (Plastic Package) DESCRIPTION The 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 correction by driving a diode modulator in TV and monitor applications. Figure 2. Pin Connections (top view) KEYSTONE CORRECTION INPUT 1 8 NON-INVERTING INPUT 100µA CURRENT SINK FRAME SAWTOOTH CURRENT INPUT 2 7 PARABOLA OUTPUT INVERTING INPUT CURRENT REFERENCE 3 6 +VS GND 4 5 OUTPUT REV. 2 May 2004 1/9 TDA8145 Figure 3. Schematic Diagram 8 7 TDA8145 CURRENT LIMITER COMPARATOR AND OUTPUT STAGE Q14 6 +VS 5 OUTPUT 4 GND Q15 Q16 Q1 Q13 VS - 3 VBE VREF Q4 Q2 R2 Q13 Q17 D1 Q18 R5 R4 R3 OP2 R6 Q12 Q19 R5 Q20 R7 Q21 OP1 1 R8 Q5 2 IIN Q7 VS - 6 VBE IREF OP3 Q11 Q6 D2 Q10 Q22 D3 Q8 Q9 Z1 R9 FULL-WAVE RECTIFIER R10 R11 R12 PARABOLA NETWORK R13 CURRENT REFERENCE 3 Table 1. Absolute Maximum Ratings Symbol Parameter Value Unit VS Supply Voltage 35 V IS Supply Current 500 mA PTOT Power Dissipation at Tamb = 50°C 500 mW TSTG , Tj Storage and Junction Temperature – 25 to 150 °C Value Unit Table 2. Thermal Data Symbol 2/9 Parameter Rth (j-c) Thermal Resistance Junction-ambient Max 100 °C/W Rth (j-a) Thermal Resistance Junction-pin 4 Max. 70 °C/W 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) Symbol Parameter VS Supply Voltage IS Supply Current Test Conditions 17 VREF Internal Reference Voltage –IREF Internal Reference Current Vref/R3 V7(A) (*) Pin 7 Output Voltage Ifr = 0 µA (*) Pin 7 Output Voltage Ifr = 30 µA V7(B) K1 7.6 Parabola Coefficient (see Figure 5) K1 = K2 Parabola Coefficient (see Figure 5) K2 = ∆V7 Typ. Max. 15.3 24 30 V 7 mA 8.0 8.8 16.0 V –V 7A 7B -----------------------------V –V 7A 7C 0.26 V –V 7A 7C -----------------------------V –V 7A 7D 0.70 – 40 Current Source S1 → b Saturation Voltage Io = 400 mA Sink S2 → b VSATH Saturation Voltage VF IFR V mA 16.7 15 VSATL Unit 4.5 0.73 ∆V7 = V7E – V7F, (*) I8 Min. V V 40 mV µA 100 1 2 V Io = 100 mA Source S2 → c S1 → b 0.8 1.5 V Forward Voltage Io = 400 mA S2 → d S1 → b 1.2 1.7 Frame Sawtooth Current Vfr = 6.6 VPP 66 V µA Figure 4. Test Circuit VS R7 R6 10kΩ 10kΩ IFR 7 VF 6 VSATH a 2 R2 VFR S2 1 TDA8145 c d 3 VREF b 5 R1 10kΩ R3 11kΩ IO 4 8 IF -IO VSATL R8 20kΩ b a S1 3/9 TDA8145 Figure 5. Parabola Characteristics V7 (V) V7A V7B V7C V7D V7E V7F -60 4/9 0 15 36 30 60 I7A (µA) TDA8145 Figure 6. Application Circuit with Keystone Correction Line Transformer (L.T.) L1 10mH LM Pin-cushion adjustment R3 RT2 47kΩ 4.7kΩ R1 = Pin 1 Voltage 5 VFRAME 66µAPP R4 18kΩ 7 C1 47nF 2 VFRAME TDA8145 6 VS C2 100nF 1 3 RT1 Keystone 100kΩ Adj. 4 R2 12kΩ 8 C3 4.7nF D1 1N4148 1kΩ Hfly from L.T. 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 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 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. H. Width R5 RT3 If the input is overmodulated (> 40µA) the internal current is limited to 40µA. This limitation can be used for suppressing the parasitic parabolic current generated during the flyback time of the frame sawtooth. A comparator OP2 is driven by the parabolic current. The second input of the comparator is connected with a horizontal frequency sawtooth voltage the DC level of which can be changed by the external circuitry for the adjustment of the picture 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. 5/9 TDA8145 PART NUMBERING Table 4. Order Codes 6/9 Part Number Package Temperature Range TDA8145 POWERDIP8 0 to 70 °C TDA8145 PACKAGE MECHANICAL Table 5. POWERDIP8 - Mechanical Data millimeters inches Symbol Min A Typ Max Min 3.3 Typ Max 0.130 a1 0.7 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b b1 0.020 0.5 0.38 0.020 0.5 D 0.015 0.020 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L Z 3.3 0.44 0.130 1.6 0.017 0.063 Figure 7. POWERDIP8 - Package Dimensions Note: Drawing is not to scale 7/9 TDA8145 REVISION HISTORY Table 6. Revision History 8/9 Date Revision Description of Changes October -1998 1 First Issue 14-May-2004 2 Stylesheet update. No content change. TDA8145 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners © 2004 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 9/9