TEA2029 STMICROELECTRONICS [STMicroelectronics], TEA2029 Datasheet
TEA2029
Related parts for TEA2029
TEA2029 Summary of contents
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... Time Constant Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V.3.5 Video Identification Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V.3.5.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V.3.6 Characteristics of Loop V.3.6.1 Locking accuracy V.3.6.2 Dynamic study Long time constant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . b. Short time constant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V.3.7 Phase Comparator Inhibition AN407/0594 APPLICATION NOTE TEA2028 - TEA2029 By : J-M. MERVAL & B. D’HALLUIN Page ...
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... TEA2028 - TEA2029 APPLICATION NOTE V.4 LINE SAW-TOOTH GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V.5 SECOND PHASE LOCKED LOOP ” 2” V.5.1 Duty of Different Building Blocks V.5.1.1 ” 2” phase comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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... VII.7 AGC KEY PULSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIII APPLICATION INFORMATION ON FRAME SCANNING IN SWITCHED MODE (TEA2029 ONLY VIII.1 FUNDAMENTALS VIII.2 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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... TEA2028 - TEA2029 APPLICATION NOTE Figure 1 Miscellaneous MISCELLANEOUS Power Supplies FUNCTIONS PRIMARY SMPS Mains CONNECTED CONTROLLER Input SMPS II - MAIN FUNCTIONS - Detection and extraction of line and frame syn- chronization pulses from the composite video signal. - Horizontal scanning control and synchronization by two phase-locked loop devices. ...
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... IV - INTERNAL BLOCK DIAGRAM Figure 2 TEA2028 - TEA2029 APPLICATION NOTE 5/46 ...
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... TEA2028 - TEA2029 APPLICATION NOTE V - FUNCTIONAL DESCRIPTION Majority of the on-chip analog functions were com- puter simulated and results such as temperature variation, technological characteristic dispersion and stability, have led to the enhancement and implementation of actually employed structures. A parallel in-depth study of the device implemented in form of integrated sub-sections is provided to analyze the overall performance set ...
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... calculated such that the locking occurs the middle of the back porch. Figure (2V TEA2028 - TEA2029 APPLICATION NOTE S’ - ...
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... TEA2028 - TEA2029 APPLICATION NOTE - In practice, at low amplitude video signals recommended to insert a low-pass filter before the ”C27” capacitor attenuate the chromi- nance sub-carrier and the noise components. The aim is to reduce the phase variations of the detected sync pulse and thus enhance the hori- zontal scanning stability ...
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... V.3.1 - Phase locked-loop ” 1” block diagram Figure 11 Phase Comparator TEA2028 - TEA2029 APPLICATION NOTE The device also provides for scanning synchroni- zation at aerial signal attenuation of approximately 75dB, i. 20dB better than other sync proc- essors. V.3 - First Phase Locked-loop Stage ” 1” ...
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... TEA2028 - TEA2029 APPLICATION NOTE V.3.2 - Functional duty of individual blocks V.3.2.1 - Phase comparator The duty of this comparator is to issue an output current proportional to the phase difference be- tween and . IN OUT V.3.2.2 - Low-pass filter This filter suppresses the parasitic component con- taining the sum of phases, smoothens the phase difference component and determines the timing characteristics of the loop ...
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... Z( Z( The second order terms of the denominator can be converted to first order products as a function of TEA2028 - TEA2029 APPLICATION NOTE frequency as follow : f(jf with 500k , 10nF t we obtain : 3.43kHz t Figure 15 ...
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... TEA2028 - TEA2029 APPLICATION NOTE Where : 1.26mH 78pF 507pF - Series resonance frequency : 503kHz Parallel resonance frequency : 540kHz Tolerance within the resonance area : 503kHz 0 Temperature stability : 0. Figure 450 500 550 ...
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... -0. Amplifier : 0. TEA2028 - TEA2029 APPLICATION NOTE ”V ” always leads the ”i IN tude function OUT 0. The Figure 24 illustrates the characteristics ...
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... TEA2028 - TEA2029 APPLICATION NOTE Figure (Degrees) V OUT IN 200 160 A 120 -200 -150 -100 - CHARACTERISTICS OF THE NON-LINEAR AMPLIFIER ”A4” (see Figures 25 and 26) This is a differential amplifier whose equivalent feed-back resistors of emitters vary as a function of its input voltage. The maximum output voltage swing is set by two ” ...
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... C25 = 1. C25 with C25 = 4.7nF T = 1ms R (which is clearly quite fast) TEA2028 - TEA2029 APPLICATION NOTE Figure 29 Line Sync C(25) I C(25 Mute Output V.3.6 - Characteristics of loop 1 V.3.6.1 - Locking accuracy Let’s study the phase error ” steady state conditions : ...
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... TEA2028 - TEA2029 APPLICATION NOTE It is therefore deduced that the system can follow all input phase variations without producing any static error. In practice, there will be a slight error due to the input bias current ”I ” of VCO, which is 0. 500kHz. This DC current is delivered by a ...
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... COMPARATOR CURRENT 1 INHIBITION SIGNAL (FRI + FS) [VCR mode] TEA2028 - TEA2029 APPLICATION NOTE sync pulse. - During line scanning (see Figures 31 and 32) This inhibition will eliminate the occurrence of all possible phase errors due to a noisy sync signal or parasitics during the line scanning phase. It yields excellent display stability at noisy video signals ...
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... TEA2028 - TEA2029 APPLICATION NOTE Figure 32 LINE SYNC . 1 SIGNAL LINE INHIBITI ON Figure Inhibition Logic Block Diagram FRI FS Line Inhibition BLK & VCR V.4 - Line saw-tooth generator Before going through a detailedstudy of the second phase locked loop ” 2”, let’s have an overview of the linesaw-tooth generator which has been mainly implemented for 2 phase variations and also the phase modulation of the switching power supply ...
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... Signal Line OUT Flyback TEA2028 - TEA2029 APPLICATION NOTE image centering, the line flyback must be phase- locked with respect to the video signal. The second phase-locked loop also offers the pos- sibility of horizontal phase-shift adjustment. Figure 35 VIDEO SIGNAL ON CATHODES LINE YOKE ...
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... TEA2028 - TEA2029 APPLICATION NOTE V.5.1 - Duty of different building blocks V.5.1.1 - ” 2” Phase comparator This block generates a current proportional to the phase difference between the phase reference ” ” and the middle of the line flyback to be phase- locked. V.5.1.2 - Low-pass filter - Rejects the parasitic component ”sum of phases” ...
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... B OUT IN V.5.2.4 - Line flip-flop (TEA2028 only for TEA2029 refer to Section VII.6) It generates a constant duration rectangular signal used to turn-off the line transistor triggered by the rising-edge of the phase comparator output voltage and reset after capacitor on pin 1 is charged. t’ ...
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... TEA2028 - TEA2029 APPLICATION NOTE A. BLOCK DIAGRAM ”V’ ” will set the flip-flop thereby allowing the OUT capacitor ”C1” charged by current ”I ered through current generator. The voltage across capacitor begins rising until it reaches ”V this time, comparator ”C” is triggered, the output of which will in turn reset the flip-flop. The capacitor ” ...
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... In order to obtain a linear deflection from left to right as a function of time, a saw-tooth current must be generated within the yoke. The approachis toapply a switched DC voltage to the line yoke. TEA2028 - TEA2029 APPLICATION NOTE - When K is closed : L(t) ...
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... TEA2028 - TEA2029 APPLICATION NOTE In practice, the power switch ”K” is built by a combination of ”High Voltage Switching Transistor” and ”Fast Recovery Diode”. Figure 47 End remains L Trace open Begining Trace ...
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... OUT ( 59.7 s (3) OUT IN d TEA2028 - TEA2029 APPLICATION NOTE R’ R’ 16.4 s/V t The open-loop dynamic gain ABf(p) = ABZ = The system exhibits the characteristics inherent first order circuit and is therefore stable. ...
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... TEA2028 - TEA2029 APPLICATION NOTE B. STUDY OF SHIFT ADJUSTMENT With R, P network connected to Pin 16, the t becomes : 59 OUT With : T2 = ABR’ (where R’ Substituting the following values into above equa- tion : - R = 470k - R’ = 470k // 25M = 46k - ...
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... C comparator ”C ” which will deliver a frame sync 0 pulse when ”V ” crosses the 2.8V level. C The overall arrangement behaves as an integrator and will therefore suppress any noise susceptible TEA2028 - TEA2029 APPLICATION NOTE 50/60Hz 50/60Hz 24 Output ...
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... TEA2028 - TEA2029 APPLICATION NOTE Figure 4.4V 1.26V ( V ) REF 64 s 20ms (50Hz) V.6.2.1 - 60Hz STANDARD SWITCHING The NTSC standard requires a vertical picture scanning frequencyof 60Hz, i.e. a saw-tooth period of 16.66ms. In order to obtain an identical deflection amplitude whatever the standard (50 or 60Hz), the saw-tooth amplitude for both periods must be the same. ...
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... Standard Mute = D60 60Hz Standard TEA2028 - TEA2029 APPLICATION NOTE Three pulses are necessary to ascertain the iden- tification prior to switching the saw-tooth amplitude. The identification signal [I reduce the synchronization window and, in case of one or two missing pulses close to 60Hz, to set the free-running frequency ...
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... TEA2029C 30/46 output also present within the normalized super sand- castle signal on Pin 11 (TEA2028 and TEA2029). V.6.3.4 - Frame blanking safety (TEA2028 only, for TEA2029 refer to section VII.5) 7.3ms Its duty is to protect the phosphor coating of picture tube in case of any problem with vertical deflection function such as scanning failure ...
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... Required voltage values are obtained by rectifying different voltage outputs delivered through secon- dary windings. The horizontal deflection stage is powered by one of these outputs delivering around hundred volts. V.7.1 - Power supply block diagram Figure 62 Mains Input TEA2164 TEA2028 - TEA2029 APPLICATION NOTE -70 A 1/1k 1.26V Input Characteristics Frame Blanking (no safety) & ...
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... TEA2028 - TEA2029 APPLICATION NOTE V.7.2 - General operating principles A fraction of the 135V output voltage to be regu- lated is compared to the 1.26V reference voltage. Resulting error signal is amplified and then applied to phase modulator ”M ”, which will deliver a 1 square waveform at line frequency whose duty cycle depends on the value of input voltage ” ...
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... OUTPUT VOLTAGE (PIN 7) LINE OUTPUT VOLTAGE (PIN 10)* * Lin e output (Pin 10 Thyristo rco ntrol output (Pin 4) for TEA2029C TEA2028 - TEA2029 APPLICATION NOTE TEA2028B to overcome this problem. This soft start system, will upon initial start-up, use the image of the falling voltage on Pin 15 to in- crease progressively the conduction cycle. The phase modulator ” ...
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... Figure 68 PIN 8 VOLTAGE (V) 1. PIN 15 3.5 VOLTAGE (V) PIN 7 VOLTAGE PIN 10 * VOLTAGE * Line output (Pin 10) and thyristor cont rol outpu t (Pin 4) for TEA2029C Figure 1.26V 1 3.3nF 34/46 V.7 Power supply in standby mode V.7.6.1 - Regulation by primary controller circuit This mode of regulation called ”Burst Mode” is ...
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... R Mute 60Hz 1 0 50Hz TEA2028 - TEA2029 APPLICATION NOTE Pin internal voltage of 0.25V. - 10V level This signal is used by color decoding stage. Its duration determined by line logic cir- cuitry. With respect to the video signal on Pin 27, this level is positioned such that it is used to sample the burst frequency transmitted just after the sync pulse ...
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... TEA2028 - TEA2029 APPLICATION NOTE VI - TEA2028 APPLICATION DIAGRAM Figure 72 1k 47nF 390 47k 3.3nF 3.32k 22nF 150pF 36/46 220 1nF 33k 2.2k 3.3nF 220nF 100nF 5.6k ...
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... VII.1 - General The TEA2029 has quite the same functions compared to TEA2028. The main difference is that the TEA2029 incorporates a frame phase modulator intended to work with a switched mode vertical stage using a thyristor. The TEA2029 can also be used with a linear vertical power amplifier such as the TDA8170. ...
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... TEA2028 - TEA2029 APPLICATION NOTE Figure 73 Transconductance Amplifier Phase Limitation (Horizontal Logic) Horizontal Flyback Safety & On/Off Switching Voltage Figure 74 HORIZONTAL FLYBACK FRAME OUTPUT HORIZONTAL SAWTOOTH VII.5 - Frame Blanking Safety - During trace : I < blocked During flyback : I > ...
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... NORMAL OPERATION 24 lines VII.6 - On-chip Line Flip-flop Figure C13 V IN Figure max = TEA2028 - TEA2029 APPLICATION NOTE IF & & IF Reset TOO LONG FLYBACK PULSE (FR) RESET BLANK’ BLANKING OUTPUT 16 s Window for max ...
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... TEA2028 - TEA2029 APPLICATION NOTE VII.7 - AGC Key Pulse Figure 79 VIDEO SIGNAL (Pin 27) AGC SIGNAL (Pin 20 illustrated below, this signal is used in some TV sets to perform sampling window for Automatic Gain Control of picture demodulation network. This system is called ”clamped” AGC, and locks the demodulated line sync amplitude and hence sets the video signal amplitude ...
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... TEA2029C Horizontal Sawtooth VIII.3 - Typical Frame Modulator and Frame Output Waveforms Figure 81 FRAME REFERENCE SAWTOOTH HORIZONTAL SAWTOOTH THYRISTOR GATING SIGNAL HORIZONTAL FLYBACK I THYRISTOR DIODE TEA2028 - TEA2029 APPLICATION NOTE L 500 H EHT Transformer C 0. ESM D 4 740 V CONTROL Frame Amplitude ...
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... TEA2028 - TEA2029 APPLICATION NOTE VIII.4 - Frame Power Stage Waveforms Figure 82 Figure 84 Figure 86 42/46 Figure 83 Figure 85 : Different Horizontal Conducting Times during Frame Figure 87 ...
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... VIII.6 - Feed-back Circuit VIII.6.1 - Frame power in quasi-bridge configu- ration (see Figure 89) This stage measures the frame scanning current in differential mode and compares it to the reference saw-tooth on Pin 3. TEA2028 - TEA2029 APPLICATION NOTE The overall configuration is built around two sym- metrical networks : - ” ” ...
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... TEA2028 - TEA2029 APPLICATION NOTE Figure 89 Frame Reference 3 Sawtooth VIII.6.1.3 - ”S” Correction circuit in quasi-bridge configuration Figure 90 TEA2029C 2. 100 R3 220 The ”S” correction waveform is obtained using the non-linear ”V ” versus ”I ” characteristics DIODE ...
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... TEA2029C N.C. 10k Frame Sawtooth +12V TEA2028 - TEA2029 APPLICATION NOTE coupling capacitor ”C high value. To avoid such situation, the voltage at point (a) should be applied to the ”Safety” input Pin 28 after it has gone through the matching network ”R4, R5”. TEA2029C +24V 200V ...
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... TEA2028 - TEA2029 APPLICATION NOTE IX - TEA2029 APPLICATION DIAGRAM Complete application with TEA2164 Figure 46/46 6.8k 390 100nF 1k 1k (1%) 3.32k 3.3nF 22nF 12k 110k 4.7nF 100nF 220nF 100nF ...
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