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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 FRAME SAWTOOTH CURRENT INPUT CURRENT REFERENCE GND
1 2 3 4
8 7 6 5
NON-INVERTING INPUT 100A CURRENT SINK PARABOLA OUTPUT INVERTING INPUT +VS OUTPUT
REV. 2 May 2004 1/9
TDA8145
Figure 3. Schematic 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
TDA8145
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
Table 1. Absolute Maximum Ratings
Symbol VS IS PTOT TSTG , Tj Supply Voltage Supply Current Power Dissipation at Tamb = 50C Storage and Junction Temperature Parameter Value 35 500 500 - 25 to 150 Unit V mA mW C
Table 2. Thermal Data
Symbol Rth (j-c) Rth (j-a) Parameter Thermal Resistance Junction-ambient Max Thermal Resistance Junction-pin 4 Max. Value 100 70 Unit C/W C/W
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Table 3. ELECTRICAL CHARACTERISTICS (Tamb = 25C, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer to the test circuit unless otherwise specified)
Symbol VS IS VREF -IREF V7(A) (*) V7(B) K1
(*)
Parameter Supply Voltage Supply Current Internal Reference Voltage Internal Reference Current Pin 7 Output Voltage Pin 7 Output Voltage Vref/R3 Ifr = 0 A
Test Conditions
Min. 17 7.6 15.3
Typ. 24 4.5 8.0 0.73 16.0 15
Max. 30 7 8.8 16.7
Unit V mA V mA V V
Ifr = 30 A V -V 7A 7B ----------------------------V -V 7A 7C V -V 7A 7C ----------------------------V -V 7A 7D - 40
Parabola Coefficient (see Figure 5) K1 =
0.26
K2 V7 I8 VSATL VSATH VF IFR
(*)
Parabola Coefficient (see Figure 5) K2 = Current Source Saturation Voltage Saturation Voltage Forward Voltage Frame Sawtooth Current
0.70
V7 = V7E - V7F, S1 b Io = 400 mA Sink S2 b Io = 100 mA Source S2 c S1 b Io = 400 mA S2 d S1 b Vfr = 6.6 VPP
40 100 1 0.8 1.2 66 2 1.5 1.7
mV A V V V A
Figure 4. Test Circuit
VS R7 10k IFR 2 VFR R1 3 10k R3 11k VREF 4 8 IF R8 20k -IO VSATL R2 1 S2 7 R6 10k 6 VF a b c d VSATH IO
TDA8145
5
b a S1
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Figure 5. Parabola Characteristics
V7 (V) V7A V7B V7C V7D
V7E -60 0 15 36 30 60
V7F I7A (A)
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Figure 6. Application Circuit with Keystone Correction
Line Transformer (L.T.)
LM
L1 10mH
Pin-cushion adjustment RT2 47k 7 R4 18k C1 47nF
R3 4.7k R1 = Pin 1 Voltage VFRAME VFRAME 66APP 2 5
TDA8145
1
6 C2 100nF
VS
3
4
8 C3 4.7nF D1 1N4148
RT1 Keystone 100k Adj.
R2 12k
1k Hfly from L.T. H. Width R5 RT3
CIRCUIT OPERATION (see the shematic diagram) A differential amplifier OP1 is driven by a vertical frequency sawtooth current of 33A 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.
If the input is overmodulated (> 40A) the internal current is limited to 40A. 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.
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PART NUMBERING Table 4. Order Codes
Part Number TDA8145 Package POWERDIP8 Temperature Range 0 to 70 C
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PACKAGE MECHANICAL Table 5. POWERDIP8 - Mechanical Data
millimeters Symbol Min A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 Typ 3.3 0.020 0.055 0.036 0.020 0.020 0.386 0.065 0.041 Max Min Typ 0.130 Max inches
Figure 7. POWERDIP8 - Package Dimensions
Note: Drawing is not to scale
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REVISION HISTORY Table 6. Revision History
Date October -1998 14-May-2004 Revision 1 2 First Issue Stylesheet update. No content change. Description of Changes
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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
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