TEA2026

TEA2026C STMICROELECTRONICS | Alldatasheet

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L5, jj SGS-THOMSON MICROELECTRONICS TEA2026C COLOR TV SCANNING AND POWER SUPPLY PROCESSOR DEFLECTION : = CERAMIC 500 KHz RESONATOR FRE- QUENCY REFERENCE = NOLINE AND FRAME OSCILLATOR ADJUST- MENT » DUAL PLL FOR LINE DEFLECTION = HIGH PERFORMANCE SYNCHRONIZATION es = SUPER SANDCASTLE OUTPUT ea « VIDEO IDENTIFICATION CIRCUIT H ™ , eo AUTOMATIC 50/60 Hz STANDARD IDENTIFI- ~ CATION ! a EXCELLENT INTERLACING CONTROL, = SPECIAL PATENTED FRAME SYNCHRO DE- : VICE FOR VCR OPERATION TEA2026C ) a FRAME SAW-TOOTH GENERATOR DIP28 = FRAME PHASE MODULATOR FOR THYRIS- (Plastic Package) TOR SMPS CONTROL : = ERROR AMPLIFIER AND PHASE MODULA- TOR a SYNCHRONIZATION WITH HORIZONTAL DE- FLECTION | = LINE FREQUENCY OPERATION PIN CONNECTIONS | = SECURITY CIRCUIT AND START-UP PRO- CESSOR = SWITCHING POWER TRANSISTOR IS TURNED OFF BY LINE FLY BACK SIGNAL

DESCRIPTION

The TEA2026C is a complete (horizontal and verti- cal) deflection processor with secondary step up EBSTEAZ026C-01 SMPS control for color TV sets. November 1988 10 1001

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(limiting values) - Tam = 25 ‘C (unless otherwise noted) [Symoo [Saat Sins] Supply votage (in 8) es a ‘ Starting Vee | Operating Supply Voitage (pin 8) v BEE Caan in 2) Cs a Video Identification Current (pin 24) [tema] Vie _| Negative line retrace voltage (pin 12) [2 | Tv [hs | tine reece curentpint2)— SSS dt [the | Line Output Current (pin 10) | =10 [40 | ma | [ts | Frame Saw-tooth Generator (pin 3) [20 ma | | le | Frame Output Current (pin 4) [| t00 | ma ‘SMPS Output Currrent (pin 7) [-40 | 40 | ma Safety Input Current (pin 28) ee ee Safety Input Voltage (pin 28) [vec Common Mode Range (pins 1-2) __ ee ee THERMAL DATA [Ripa [voneton Anbiont ThermalReswiance ——SSSC*dYSCC*d GENERAL DESCRIPTION INTRODUCTION = VCR input for PLL time constant and frame oa synchro switching. This integrated circuit uses PL bipolar technology = AGC key pulse output. ___ and combines analog signal processing with digital Frame saw-tooth generator and phase modula- | processing. tor Timing signals are obtained from a voltage-control-___» Switching mode regulated power supply com- led oscillator (VCO) operating at 500 kHz by means prising error ampltier and phase modulator. of a cheap ceramic resonator. This avoids the fre- © Scury crea and start-up processor. quency adjustment normally required with line and . ne . frame oscillators. The circuit is supplied in a 28 pin DIP case. "A chain of dividers and appropriate logic circuitry Voo = 12V. "produce very accurately defined sampling pulses and the necessary timing signals. SYNCHRONIZATION SEPARATOR The principal functions implemented are : Line synchronization separator is clamped to «s Horizontal scanning processor. black level of input video signal with synchronization = Frame scanning processor : Two applications Pulse bottom level measurement. are possible : : The synchronization pulses are divided centrally be- - D Class Power stage using an extemal thyr- tween the black level and the synchronization pulse | istor. bottom level, to improve performance on video sig- - BClass Power stage using an external power _nals in noise conditions. ampiifier with fly-back generator such as the TDA2172. FRAME SYNCHRONIZATION | Line and frame synchronization separation. Fi nization is fully integrated (no ex- | Dual phase-locked loop horizontal scanning. Hii yc sehr a ali am | High performance frame and line synchroniza- ’ : - | tion with interlacing control. The frame timing identification logic permits auto- _& Video identification circuit. matic adaptation to 50 - 60 Hz standards or non-in- | = Super sandcastle. terlaced video. | = Automatic 50-60 Hz standard identification. G77 SGS:THOMSON 310 SY) incnoancrnones 4003

‘An automatic synchronization window width system In VCR mode, the frame synchronization window provides : widens out toa search window and there isno delay ; = fast frame capture (6.7 ms wide window), of frame fly-back (direct synchronization). ® good noise immunity (0.4 ms narrow window). The internal generator starts the discharge of the | FRAME SCANNING saw-tooth generator so that itis not disturbed byline Frame saw-tooth generator : fly-back effects. The current to charge the capacitor is automatically Thanks to the logic control, the beginning of the switched to 60 Hz operation to maintain constant charge phase does not depend on any disturbing amplitude. effect of the line fly-back. Frame phase modulator (with two differentiel in- A 32 us timing is automatically applied on stand- puts) : ardized transmissions, for perfect interlacing. The output signal is a pulse at the line frequency, In VCR mode, the discharge time is controlled by an _pulse width modulated by the voltage at the differen intemal monostable independant of the line fre- tial pre-amplifier input. quency and gives a direct frame synchronization. This signal is used to control a thyristor which pro- vides the scanning current to the yoke. The saw- HORIZONTAL SCANNING tooth output is a low impedance and can therefore The horizontal scanning frequency is obtained _be used in class B operation with a power amplifier from the 500 KHz VCO. circuit. The circuit uses two phase-locked loops (PLL) the rstone contol the frequency, the secandone SWITCH MODE POWER SUPPLY (SMPS) SEC- controls the relative phase of the synchronization and line fly-back signals. This power supply uses a differential error amplifier with an internal reference voltage of 1.26 V and a ecuaener PLLhastwoswitchedtimeconstants — Shase modulator operating at the line frequency. ® capture with a short time constant, The power transistoris turned off by the ine fy-back. = good noise immunity after capture with a long The “soft start” device imposes a very small conduc- time constant. tion angle on starting up, this angle progressively in- The output pulse has a constant duration of 26 us, __Creases to its nominal regulation value. independent of Vcc and any delay in switching off — The maximum conduction angle may be monitored the scanning transistor. by forcing a voltage on pin 15. This pin may also be VIDEO IDENTIFICATION used for current limitation. The horizontal synchronization signal is sampledby SECURITY CIRCUIT AND START UP PROCES- a 2 us pulse within the synchronization pulse. The © SOR | _ signal is integrated by an external capacitor. When the security input (pin 28) is at a voltage ex- Fcati i ceeding 1.26 V the three outputs are simultaneous- Tie identification function provides three diferent F°EN"3 iis voltage trope below tho 1.26 V «0 V :no video identification threshold again. In this case the switch mode power = 6 V : 60 Hz video identification supply is restarted by the "soft start" system. = 12 V:50 Hz video identification If this cycle is repeated three times, the three out- This information may be used for timing research in _ puts are cut off definitively. To reset the safety logic the case of frequency or voltage synthetizer type re- circuits Vcc must be lower than 3.5 V. ceivers, and for audio muting, This circuit eliminates the risk to switch off the TV SUPER SANDCASTLE with 3 levels : burst, line receiver in the event of a flash affecting the tube. fly back, frame blanking. On starting up, the horizontal and vertical scanning In the event of vertical scanning failure, the frame functions come into operation at Vcc = 6 V. The blanking level goes high to protect the tube. power supply then comes into operation progress- ively, only when @ 2 is normally locked. VCR INPUT On shutting down, (with Veo < 5.25 V) the three This provides for continuous use of the short time functions are inhibited simultaneously after the first constant of the first phase-locked loop (frequency). _line fly-back.

40 Gj SSS:THOMSON

ELECTRICAL OPERATING CHARACTERISTICS Tams = 25 ‘C - Vec = 12 V (unless otherwise noted)-Pulse Duration at 50 % of the Ampl. [Symbol [Parameter Min. | Typ. | Max. [Unit | Pe" gremern i erarsenrees [Te Te To load) Synch, Separator (pins 26-27) Positive video input AC coupied (ouput impedance of signal source < 200 Q) 02 18 3 Vpp ler Negative Clamping Current (during synch. pulse) -25 | -40 | -55 WA Izy | Clamping Current 3 6 9 A Pin for Slicing Level 0.2 V < Va7pp <2 V, (50 % of sync. amplitude) =l26 | Positive Current 0 | -750 |-1000] pA log _| Negative Current 17_| 25 | 36 WA Pulse tor keyed AGC (pin 20) Negative (function : without video signal : low level, with video signal : key pulses) loo | Output Current 5 mA V20 Output Saturation Voltage (l2o = 5 MA) 04 v te Pulse Width (synchro pulse is always inside the key pulse] 65. as _| us VCO (pins 17-18 and 19) Frequency Control Range after Line Divider 15.30 kHz to : (ceramic resonator : 503 kHz) . 16.10 | Phase Comparator o 1 (pin 22) ) Output Current Low Loop Gain +035 | +05 | +065) ma High Loop Gain =1 [415 | 22 | ma | Window Pulse Width 7 10 13 Ss ) VCR Switching (pin 23) Threshold Voltage VCR Operating 17 | 22 | 27 v “te Input Current (Voy = Voc = 12 V)_ =003 |~025| -1 | ma Video Identification (pin 24) Vou ‘Output Saturation Voltage (without video signal, l24 = 3 mA) 02 06 v Output Voltage (with 60 Hz video signal, In. = 2.5 mA) 5 65 75 Vv Ouput Voltage (with 50 Hz video signal, I< = 10 1A) 1 | 115 v Video Identification (pin 25) las | Output Current (charging the capacitor) os | 075 | 4 mA tzs | Identification Time (charging the capacitor) 13 | 17 | 22 | us ] Vos Threshold (voltage changing from lower to higher value) 4 45 5 v Luvs Hysteresis 150 240 400 mv H-ramp Generator (pin 13) i} eni3_ | Charge Current 185 | 200 | 215 | pA Viis__ | Base Voltage of Saw-tooth 0S v luisia | Discharge Current 35 7 mA ‘Super Sandcastle (pin 11) Output Voltages Ver Burst Key Pulse Level (I); =— 5 mA) 9 v Vu Line Blanking Pulse Level (1;; =— 5 mA) 4 45 5 Vv Vats1 | Frame Blanking Pulse Level (and frame out of function)-(Iy; = | 2 28 3 v —5 mA) To: Delay between Midle of Synch, Pulse (pin 27) and Leading ' | Edge of Burst Key Pulse 23 3 ys Duration of Burst Key Puise 37 4 5 us Tor Delay between SSC Cutting Level at Pin 12 and Line Blanking 0.35 us | Pulse Frame Blanking Time (start with reset of frame divider) 24 Line — S10

57 SS ONSON

ELECTRICAL CHARACTERISTICS (continued) [Symbol | Parameter Min. | Typ. | Max. | Unit | ‘Negative Line Fly Back input (pin 12) Threshold for SMPS Safety 1 v Von2 | Threshold for Blanking | 145 | 12 v Voi2 | Threshold for PLL2 -4 v Iie | Input Current 11V < V+2 -200 | A lig | Input Current 1.3 V< Vi2 < 11 V -3 +3 | yA lia | Input Current 0 V< Vio <1.3V ° -80 | HA lia | Input Current - 1 V<Vi2<0V 0 -1 | -2 | mA Line Blanking Trigger 80 A Phase Comparator « 2 (pin 16) Charging Current 04 | 06 | 08 Delay between the edges of @ 1 and @ 2 (fvoo = 500 kHz) 15. 2 28 Line Qutput (open collector, (fvco = 500 kHz))-(pin 10) Output Voltage (I}omax = 20 mA) 1 15 v tio | Output Pulse Duration (when fly-back pulse is in time with tyo)| 24 26 30 us 4 @ 2 Phase Range 15 16 19 S Erame Logic Free Running Period (with mute signal) Line Search Window 247 361 | Line

50 Hz Window 309 315 | Line

60 Hz Window 247 276 | Line

VCR Mode Window 247 361_| Line Frame Saw-tooth Generator (pins 3-5) Typical Saw-tooth Amplitude (with external RC) 25 Vpp 15(60) | Internal Current Generator (60 Hz on) 12 14 16 A Discharging Time (with C = 0.47 uF, AV <4 V) 10 60 us Vs Starting Level (0 < Is < 10 mA} 1 126 | 14 v Ecame Feedback Inputs (pins 1-2) Positive and Negative Input Current BA (Vi — V2 > 25 mA for frame blanking safety) Erame Qutout (pin 4) Output Voltage (0 mA < |Is| < 80 mA) 10 v ton max (fyoo = 500 KHz) 36 a us Output Phase Range 0 tonmax 1a | ip rat s | | te Ta | Input Current (Vo = Vretrs) A SMPS Output (pin 7) In all Case, End of SMPS Pulse (pin 7) and Leading Edge of Line Flyback (pin 12) in Phase V7 | Output Voltage (0 < I7 < 20 mA) 10 v ca tonmax (fyco = 500 kHz) 30 34 us Nominal Time (Vo = Viets4) us Output Phase Range 0 ton max Salety Input (pin 28) Vee | Threshold Voltage (Viers4) 137 | v Input Current (if Vier s Vee < 5 V then SMPS, line and frame 3 WA are switched off during the next line retrace)

6110 G57 SSs:THOMSON

ELECTRICAL CHARACTERISTICS (continued) [Symbol [Parameter Min. ‘| Typ. | Max. [ Unit | ‘Switch=on, Switch-off Processing (pin 15) lenis | Charging Current (tc = 4 us, T = 64 us) 70 130 pA lenis | Ratio Charging/discharging 08 1 12 ‘Starting Supply Voltage (pin 8) Veo ‘SMPS", Frame and Line Starting (pin 7, 10, 4) v Veo SMPS Stopping During Line Retrace v Veco Frame and Line Stopping v Vetyst Hysteresis between Switching-on and Switching-off Level mv * Progressive Starting by Decreasing Vis ‘Current Reference (pin 14) lL v_| Gy ScS:THoMsoN 710 SYM acromuscrnonics 1007

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APPLICATION CIRCUIT (with thyristor frame power) Fi es : is z Poles. a | He . Zs | i 3 | ah Hho | 3 | 28 Aah Wg * ies cy £38 ~ -23 = i ere HA ga | q 23) |e ils #35 < ? kel’) | 7y°2 | 8 > i es 2 << 3t i[Pebeddoo,' | $ il s _ If (> -— 4 y Hite g — 7 $ | (] ; ns g J rls, Eg q Ei ran fs . | Hh@ 4 il) aie HH DH ere 3] Le-eeeaaaae B gy gl 2) Ged) |? gp rn ee : ple exsreacozscos | | * 9/10 1009

28 PINS - PLASTIC DIP

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