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TDA8145
TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES
. . . . . . . .
LOW DISSIPATION 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 (Th = 0.4mm) (Plastic Package) ORDER CODE : TDA8145
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. 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
October 1998
1/5
8145-01.EPS
TDA8145
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
ABSOLUTE MAXIMUM RATINGS
Symbol Vs Is Ptot Tstg, Tj Parameter Supply Voltage Supply Current Power Dissipation at Tamb = 50 C Storage and Junction Temperature Value 35 500 500 - 25 to 150 Unit V mA mW C
THERMAL DATA
Max. Max.
8145-02.TBL 8145-03.TBL
Symbol Rth (j-c) Rth (j-a)
Parameter Thermal Resistance Junction-ambient Thermal Resistance Junction-pin 4
Value 100 70
Unit C/W C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, 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) (*) 2/5 Parameter Supply Voltage Supply Current Internal Reference Voltage Internal Reference Current Pin 7 Output Voltage Pin 7 Output Voltage Test Conditions Min. 17 7.6 Vref/R3 Ifr = 0 A Ifr = 30 A 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
8145-01.TBL
8145-02.EPS
TDA8145
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer to the test circuit unless otherwise specified) (continued)
Symbol K1 K2 V7 (*) I8 VSATL VSATH VF Ifr Parameter Parabola Coefficient (see Figure 2) Parabola Coefficient (see Figure 2) Current Source Saturation Voltage Saturation Voltage Forward Voltage Frame Sawtooth Current Test Conditions V7A - V7B K1 = V7A - V7C V7A - V7C K2 = V7A - V7D V7 = V7E - V7F S1 b Io = 400 mA Sink Io = 100 mA Source Io = 400 mA Vfr = 6.6 Vpp Min. Typ. 0.26 0.70 - 40 S2 b S2 c S2 d 100 1 0.8 1.2 66 40 2 1.5 1.7 mV A V V V A Max. Unit
Figure 1 : Test Circuit
VS R7 10k IFR 2 VFR R1 3 10k R3 11k VREF 4 8 IF R8 20k
8145-03.EPS
R6 10k 7 6 VF a S2 b c d VSATH IO
R2 1
TDA8145
5
-IO
VSATL
b a S1
Figure 2 : Parabola Characteristics
V7 (V) V7A V7B V7C V7D
V7E -60 0 15 36 30 60
V7F IFR (A)
8145-04.EPS
3/5
8145-04.TBL
S1 b S1 b
TDA8145
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
Hfly from L.T.
H. Width R5 RT3
CIRCUIT OPERATION (see the schematic diagram) A differential amplifier OP1 is driven by a vertical frequency sawtooth current of 33A which is produced via an external resistor from the 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 network which 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.
4/5
8145-05.EPS
1k
TDA8145
PACKAGE MECHANICAL DATA 8 PINS - PLASTIC POWERDIP
Dimensions A a1 B B1 b b1 D E e e3 e4 F I L Z
Min. 0.7 1.39 0.91
Millimeters Typ. 3.3
Max.
Min. 0.020 0.055 0.036
Inches Typ. 0.130
Max.
1.65 1.04 0.5 0.5 9.8 8.8 2.54 7.62 7.62 7.1 4.8 3.3
0.065 0.041 0.020 0.020 0.386 0.346 0.100 0.300 0.300
DIP8PW.TBL
0.38
0.015
0.280 0.189 0.130 0.017 0.063
0.44
1.6
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 licence 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 (c) 1998 STMicroelectronics - All Rights Reserved Purchase of I2C Components of STMicroelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com
5/5
PM-DIP8.EPS

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