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| TEA2031A COLOR TV EAST-WEST CORRECTION FEATURES SUMMARY BUILD IN FRAME PARABOLA FROM EXTERNAL SAW-TOOTH Figure 1. Package PARABOLA CORRECTION ADJUSTMENT KEYSTONE CORRECTION ADJUSTMENT LINE SIZE ADJUSTMENT LINE DYNAMIC CORRECTION POSSIBILITY (beam current) D CLASS OUTPUT MODULATOR WITH BUILD IN RECOVERY DIODE 50 OR 60Hz OPERATION LOW DISSIPATION FEW EXTERNAL COMPONENTS DIP8 (Plastic Package) 8 1 DESCRIPTION The TEA2031A is intended to ensure frame rate modulated parabolic and keystone corrections to the horizontal deflection circuitry of 110 color TV sets. The linear frame saw-tooth is applied to appropriate circuitry from which a corresponding parabolic waveforms is obtained. This waveform is then fed to a comparator together with the linear line sawtooth for comparison. Comparator's output drives the output power stage which is capable of sinking the external coil currents of up to 0.5A. An internal recovery diode feeds back to the power supply the coil fly-back current pulses of as high as 0.5A. REV. 2 April 2004 1/11 TEA2031A Figure 2. Pin Connections MULTIPLIER INPUT 1 1 AND 2 CAN BE INVERTED MULTIPLIER INPUT 2 CURRENT REFERENCE GROUND 1 2 3 4 8 7 6 5 COMPARATOR INPUT 2 MULTIPLIER OUTPUT AND COMPARATOR INPUT 1 V CC POWER SUPPLY OUTPUT Figure 3. Block Diagram Line SAW-TOOTH VCC +24V 6.8mH To DIODE MODULATOR 8 100 7 6 5 50A 120A VCC Comparator K . (I1 - I2) 2 Multiplier V REF i1 1 39K 39K i2 2 6.3V 3 22K 4 TEA2031A DC Frame SAW-TOOTH GENERAL DESCRIPTION The TEA2031A is intended to provide to 110 color TV sets a parabolic and keystone frame rate modulated correction in addition to the main horizontal scanning. A stable 6.3V internal reference provides current and voltage references to the whole IC. Pins 1 and 2 are two symmetrical inputs of an onchip multiplier circuit and are internally held at 6.3V reference potential level. Current inputs to these pins are drawn from external sources via appropriate resistors. The frame saw-tooth waveform which has a peak-to-peak value of around 3 volts and a mean value of about 2.5 volts, supplies 2/11 TEA2031A the required current via a series resistor to pin 1. Likewise, the current to pin 2 is drawn through a series resistor from an external dc voltage source. These series resistors can have values of around 40k resulting in input currents of approximately 0.1mA modulation current. Pin 7 should be loaded to ground through a 100k resistor which as a result will produce a parabola of 5 volts peak-to-peak at pin 7. This parabola is symmetrical if the DC current flowing into pin 2 is equal to the mean input current of pin 1. Otherwise, the parabola becomes dissymmetrical and produces a keystone effect correction. The line saw-tooth at pin 8 is obtained by feeding the line fly-back voltage through an integrator netTable 1. Absolute Maximum Ratings Symbol V6-4 I5-4 I5-6 I1 and I2 PTOT TSTG I5-4 I5-6 Supply Voltage Output Sink Current Diode Output Current Input Current Power Dissipation Storage Temperature Range Non Repetitive Peak Current on Output Transistor Non Repetitive Peak Current on Output Diode Parameter Value 35 0.5 0.5 - 0.5 0.8 - 20 to 150 1.5 1.5 Unit V A A mA W C A A work formed by a diode and a grounded capacitor (see typical application diagram). The DC component of the line saw-tooth is compensated by an internal current sinking source ; so that the mean DC values of line saw-tooth and frame parabola voltages are equal. Line saw-tooth and frame parabola signals are applied to a comparator whose output is in the form of width modulated pulses. During every pulse duration, the output (pin 5) can sink external coil currents of up to 0.5A associated with diode modulator of the main horizontal scanning circuit. An internal recovery diode feeds back the fly-back energy of the coil to the power supply. This diode can carry currents of up to 0.5A. Table 2. Thermal Data (Tamb = + 50C) Symbol Rth (j-a) Parameter Junction-ambient Thermal Resistance Value 80 Unit C/W Table 3. ELECTRICAL OPERATING CHARACTERISTICS Symbol V6-4 I6 Supply Voltage Supply Current (R(3-4) = 22k ; IOUT = 0) No Load Consumption (R(3-4) = 22k ; IOUT = 0 ; V(6-4) = 24V) V3-4 I1mean I1PP I2 I2 Voltage Reference (R(3-4) = 22k) Frame Saw-tooth Input DC Mean Current R1 = 39k at 2.5V Mean - saw-tooth Voltage Frame Saw-tooth Input Peak-to-peak Current R1 = 39k at 2.5V Mean - saw-tooth Voltage Keystone Correction Input DC Current If I1 Mean = I2 : No Keystone Effect. R2 = 39k at 2.5V DC ref. Keystone Correction Input DC Current for Maximum Keystone Effect 5.9 Parameter Min. 16 Typ. 24 4 100 6.3 0.1 70 0.1 12.5 Max. 35 6 150 6.7 Unit V mA mW V mA A mA A 3/11 TEA2031A V7H V7H Top Parabola Voltage (2V < V1 = V2 < 3V) Top parabola temperature drift 10 15 0.5 V mV/C Table 4. SYMMETRICAL PARABOLA FOR NO KEYSTONE EFFECT (see Figure 4) Symbol V7H - V7L (V7H - V7L) Parameter Parabola Amplitude (V2 = 2.5V ; V1 mean = 2.5V, V1pp = 3V) Parabola amplitude drift versus temperature Min. 3.5 Typ. 5.2 Max. 6 1 Unit V mV/C V -V 7H 7L1 -------------------------------- Symmetry V 7H - V 7L2 0.8 1 1.2 4/11 TEA2031A Table 5. MAXIMUM DISSYMMETRICAL PARABOLA FOR MAXIMUM KEYSTONE EFFECT (see Figure 4) Symbol V7H - V7B V -V 7H 7B ----------------------------V -V 7H 7A Parameter Parabola Amplitude (V2 = 2V or V2 = 3V ; V1 mean = 2.5V ; V1pp = 3V) Parabola Amplitude Ratio Min. 5.3 Typ. 8.5 Max. 9.2 Unit V 0.8 1 1.2 Table 6. DIFFERENTIAL AMPLIFIER Symbol Input 8 Sink Current Source I8 = F() Input 8 Current Drift Versus Temperature Transfer Characteristics (pins 7-8) (F = 1MHz) Input Noise (pins 7-8) Rise and Fall Time (louput = 250mA) V5-4 V6-5 V5-6 Output Saturation Voltage to Ground (I5 = 0.5 A) Output Saturation Voltage to VCC (I5 = 0.1A) Output Diode Direct Voltage (I5 = + 0.5A) 1 1.2 2 1.2 5 Parameter Min. 0.04 Typ. Max. 0.06 0.1 500 50 Unit mA %/mW V V A/s V V V 5/11 TEA2031A Figure 4. PARABOLA OUTPUT FIGURE 1 4V 3V 2.5V 2V 1V t 0 FIGURE 2 V7H V2 = V1 MEAN = 2.5V V7L V7L1 V7L2 t 0 FIGURE 3 V7H V7A V2 = 3V V2 V1 MEAN V7B 10ms V2 = 2V t V7 10ms V7 10ms 20ms V1 Figure 5. PARABOLA TEST DIAGRAM VCC 24V 100k V7 8 7 6 5 TEA2031A 1 2 3 4 39k 39k 22k V1 V2 6/11 TEA2031A Figure 6. TYPICAL APPLICATION LINE FLY-BACK 200V 22nF E-W CORRECTION EFFICIENCY (FEED-BACK) 6.3mH VCC 1.8nF 8 7 6 24V 5 To DIODE MODULATOR 22k 100k 33k 1M 1N4148 LINE SIZE ADJUSTMENT 4.7k TEA2031A 1 2 3 4 +3.8V +2.5V +1.2V 0V TYPICAL FRAME SAW-TOOTH 39k 39k 22k I 3 REFERENCE 2V 3V KEYSTONE ADJUSTMENT 7/11 TEA2031A PART NUMBERING Table 7. Order Codes Part Number TEA2031A Package DIP8 Temperature Range -25 to 85 C 8/11 TEA2031A PACKAGE MECHANICAL Table 8. DIP8 - Mechanical Data millimeters Symbol Min A a1 B b b1 D E e e3 e4 F i L Z 3.18 7.95 2.54 7.62 7.62 6.6 5.08 3.81 1.52 0.125 0.51 1.15 0.356 0.204 1.65 0.55 0.304 10.92 9.75 0.313 0.100 0.300 0.300 0.260 0.200 0.150 0.060 Typ 3.32 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384 Max Min Typ 0.131 Max inches Figure 7. DIP8 - Package Dimensions e4 A a1 I b1 E b Z B B1 e e3 D Z 8 5 1 4 Note: Drawing is not to scale F L 9/11 TEA2031A REVISION HISTORY Table 9. Revision History Date May-1993 20-Apr-2004 Revision 1 2 First Issue Stylesheet update. No content change. Description of Changes 10/11 TEA2031A 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 (c) 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 11/11 |
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