TEA2031A COLOR TV EAST-WEST CORRECTION FEATURES SUMMARY ■ BUILD IN FRAME PARABOLA FROM EXTERNAL SAW-TOOTH ■ 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 Figure 1. Package 8 1 DIP8 (Plastic Package) 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 8 COMPARATOR INPUT 2 1 AND 2 CAN BE INVERTED MULTIPLIER INPUT 2 2 7 MULTIPLIER OUTPUT AND COMPARATOR INPUT 1 CURRENT REFERENCE 3 6 V CC POWER SUPPLY GROUND 4 5 OUTPUT Figure 3. Block Diagram Line SAW-TOOTH VCC +24V 6.8mH To DIODE MODULATOR 8 7 6 5 100Ω Comparator VCC 50µA 120µA K . (I1 - I2) 2 Multiplier V REF i1 i2 6.3V 39KΩ 3 4 TEA2031A 22KΩ 2 39KΩ 1 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. 2/11 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 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 40kΩ resulting in input currents of approximately 0.1mA ± modulation current. Pin 7 should be loaded to ground through a 100kΩ 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 net- 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 1. Absolute Maximum Ratings Symbol Parameter Value Unit V6–4 Supply Voltage 35 V I5–4 Output Sink Current 0.5 A I5–6 Diode Output Current 0.5 A – 0.5 mA 0.8 W – 20 to 150 °C I1 and I2 Input Current PTOT Power Dissipation TSTG Storage Temperature Range I5–4 Non Repetitive Peak Current on Output Transistor 1.5 A I5–6 Non Repetitive Peak Current on Output Diode 1.5 A Value Unit 80 °C/W Table 2. Thermal Data (Tamb = + 50°C) Symbol Parameter Rth (j-a) Junction-ambient Thermal Resistance Table 3. ELECTRICAL OPERATING CHARACTERISTICS Symbol V6–4 I6 Parameter Supply Voltage Min. Typ. Max. Unit 16 24 35 V 4 6 mA 100 150 mW 6.3 6.7 V Supply Current (R(3-4) = 22kΩ ; IOUT = 0) No Load Consumption (R(3-4) = 22kΩ ; IOUT = 0 ; V(6-4) = 24V) V3–4 Voltage Reference (R(3-4) = 22kΩ) 5.9 I1mean Frame Saw-tooth Input DC Mean Current R1 = 39kΩ at 2.5V Mean - saw-tooth Voltage 0.1 mA I1PP Frame Saw-tooth Input Peak-to-peak Current R1 = 39kΩ at 2.5V Mean - saw-tooth Voltage 70 µA Keystone Correction Input DC Current If I1 Mean = I2 : No Keystone Effect. R2 = 39kΩ at 2.5V DC ref. 0.1 mA ± 12.5 µA I2 ∆I2 Keystone Correction Input DC Current for Maximum Keystone Effect 3/11 TEA2031A V7H Top Parabola Voltage (2V < V1 = V2 < 3V) ∆V7H Top parabola temperature drift 10 15 V 0.5 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) Typ. Max. Unit 3.5 5.2 6 V 1 mV/°C Parabola amplitude drift versus temperature V –V 7H 7L1 --------------------------------- Symmetry V 7H – V 7L2 4/11 Min. 0.8 1 1.2 TEA2031A Table 5. MAXIMUM DISSYMMETRICAL PARABOLA FOR MAXIMUM KEYSTONE EFFECT (see Figure 4) Symbol Parameter Min. Typ. Max. Unit V7H – V7B Parabola Amplitude (V2 = 2V or V2 = 3V ; V1 mean = 2.5V ; V1pp = 3V) 5.3 8.5 9.2 V Parabola Amplitude Ratio 0.8 1 1.2 V –V 7H 7B -----------------------------V –V 7H 7A Table 6. DIFFERENTIAL AMPLIFIER Symbol Parameter Input 8 Sink Current Source ∆I8 = F(θ) Min. 0.04 Input 8 Current Drift Versus Temperature Transfer Characteristics (pins 7-8) (F = 1MHz) 5 Input Noise (pins 7-8) Rise and Fall Time (louput = 250mA) V5–4 Output Saturation Voltage to Ground (I5 = 0.5 A) V6–5 Output Saturation Voltage to VCC (I5 = 0.1A) V5–6 Output Diode Direct Voltage (I5 = + 0.5A) Typ. Max. Unit 0.06 mA 0.1 %/mW 500 µV 50 V 1 A/µs 1.2 V 2 V 1.2 V 5/11 TEA2031A Figure 4. PARABOLA OUTPUT V1 FIGURE 1 4V 3V 2.5V 2V 1V t 0 10ms 20ms V7 FIGURE 2 V7H V2 = V1 MEAN = 2.5V V7L V7L1 V7L2 t 0 10ms V7 FIGURE 3 V7H V7A V2 = 3V V2 ≠ V1 MEAN V2 = 2V V7B t 10ms Figure 5. PARABOLA TEST DIAGRAM VCC 24V 100kΩ V7 8 7 6 5 3 4 TEA2031A 1 2 39kΩ 39kΩ V1 6/11 V2 22kΩ TEA2031A Figure 6. TYPICAL APPLICATION LINE FLY-BACK 200V 22nF 22kΩ 100kΩ 33kΩ 1MΩ E-W CORRECTION EFFICIENCY (FEED-BACK) 1N4148 LINE SIZE ADJUSTMENT 6.3mH VCC 4.7kΩ 1.8nF 8 7 To DIODE MODULATOR 24V 6 5 3 4 TEA2031A 1 2 39kΩ +3.8V 39kΩ 22kΩ I 3 REFERENCE +2.5V 2V +1.2V 0V TYPICAL FRAME SAW-TOOTH 3V KEYSTONE ADJUSTMENT 7/11 TEA2031A PART NUMBERING Table 7. Order Codes 8/11 Part Number Package Temperature Range TEA2031A DIP8 -25 to 85 °C TEA2031A PACKAGE MECHANICAL Table 8. DIP8 - Mechanical Data millimeters inches Symbol Min Typ A Max Min 3.32 Typ Max 0.131 a1 0.51 0.020 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 D E 10.92 7.95 9.75 0.430 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 i 5.08 0.200 L 3.18 3.81 Z 0.125 0.150 1.52 0.060 Figure 7. DIP8 - Package Dimensions B B1 e b I E e3 Z b1 L a1 A e4 Z D 5 1 4 F 8 Note: Drawing is not to scale 9/11 TEA2031A REVISION HISTORY Table 9. Revision History 10/11 Date Revision Description of Changes May-1993 1 First Issue 20-Apr-2004 2 Stylesheet update. No content change. 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 © 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