TEA2028B COLOR TV SCANNING AND POWER SUPPLY PROCESSOR . . .. .. .. .. . . . . . DEFLECTION CERAMIC 500kHz RESONATOR FREQUENCY REFERENCE NO LINE AND FRAME OSCILLATOR ADJUSTMENT REFERENCE DUAL PLL FOR LINE DEFLECTION HIGH PERFORMANCE SYNCHRONIZATION SUPER SANDCASTLE OUTPUT FRAME BLANKING WITH SAFETY CIRCUIT VIDEO IDENTIFICATION CIRCUIT AUTOMATIC 50/60Hz STANDARD IDENTIFICATION EXCELLENT INTERLACING CONTROL SPECIAL PATENTED FRAME SYNCHRO DEVICE FOR VCR OPERATION FRAME SAW-TOOTH GENERATOR DESCRIPTION The TEA2028B is a complete (horizontal and vertical) deflection processor with secondary to primary SMPS control for color TV sets. SMPS CONTROL ERROR AMPLIFIER AND PHASE MODULATOR SYNCHRONIZATION WITH HORIZONTAL DEFLECTION SECURITY CIRCUIT AND START-UP PROCESSOR OUTPUT PULSES ARE SENT TO THE PRIMARY SMPS IC TEA2261 THROUGH A LOW COST SYNCHRO PULSE TRANSFORMER DIP28 (Plastic Package) ORDER CODE : TEA2028B August 1993 LINE MONOSTABLE CAPACITOR 1 28 SAFETY INPUT SAFETY FRAME BLANKING INPUT 2 27 VIDEO INPUT FRAME SAW-TOOTH OUTPUT 3 26 H. SYNCHRO CAPACITOR (tip level) FRAME BLANKING OUTPUT 4 25 VIDEO IDENTIFICATION CAPACITOR FRAME RAMP GENERATOR 5 24 MUTING + 50/60Hz IDENT. OUTPUT GROUND POWER 6 23 V.C.R. INPUT SWITCH MODE POWER SUPPLY OUTPUT 7 22 PHASE COMPARATOR Φ1 CAPACITOR V CC 8 21 GROUND SUBSTRAT S.M.P.S. INPUT REGULATION 9 20 FRAME SYNCHRO ADJ USTMENT CAPACITOR HORIZONTAL OUTPUT 10 19 V.C.O. INPUT S. SANDCASTLE OUTPUT 11 18 V.C.O. OUTPUT HORIZONT AL FLYBACK INPUT 12 17 V.C.O. 90° REF. HORIZO NTAL SAW-TOOTH 13 16 PHASE COMPARATOR Φ2 CAPACITOR CURRENT REFERENCE 14 15 STARTING AND SAFETY CAPACITOR 2028B-01.EPS PIN CONNECTIONS 1/9 2/9 3 2 1 2028B-02.EPS V CC FRAME BLANKING OUTPUT 4 25 FRAME BLANK OUTPUT FRAME SAWTOOTH OUTPUT 5 6 S.M.P.S. OUTPUT POWER GROUND FRAME SAFETY 50/60 Hz 22 ϕ1 INHIBITION TIME CONSTANT SWITCHING ϕ1 DET 7 V CC 8 S.M.P.S. ϕ MODULAT. SOFT STARTING CIRCUIT SWITCH ON/OFF SAFETY CIRCUIT FRAME TIMING IDENTIFICATION LOGIC SAFETY LOGIC 50/60Hz 2µs VIDEO IDENTIFICATION VCR INPUT 23 24 FRAME SAWTOOTH FRAME ERROR AMPLIFIER SAFETY INPUT HORIZONTAL SYNCHRO AND FRAME SYNCHRO V R 1.26V 28 FRAME SAWTOOTH OUTPUT FRAME BLANKING SAFETY VIDEO INPUT 27 26 H. SYNC TEA2028B VCR SWITCHING INPUT 50/60Hz MUTING OUTPUT 20 9 VR 1.26V H. INHIBIT HORIZONTAL LOGIC TIMING SUBST 21 SUBSTRAT GROUND REFERENCE CURRENT VOLTAGE 10 11 12 13 14 15 16 17 3.3kΩ VCC HORIZONTAL FLYBACK INPUT S SC OUTPUT SUPER SANDCASTLE HORIZONTAL OUTPUT H. OUTPUT ϕ2 18 V R 1.26V H. SAWTOOTH GENERATOR LINE MONOSTABLE VCO 500kHz 19 503kHz TEA2028B BLOCK DIAGRAM TEA2028B GENERAL DESCRIPTION Introduction This integrated circuit uses I 2L bipolar technology and combines analog signal processing with digital processing. Timing signals are obtained from a voltage-controlled oscillator (VCO) operating at 500kHz by means of a cheap ceramic resonator. This avoids the frequency adjustment normally required with line and frame oscillators. A chain of dividers and appropriate logic circuitry produce very accurately defined sampling pulses and the necessary timing signals. The principal functions implemented are : - Horizontal scanning processor. - Frame scanning processor : B Class Power stage using an external power amplifier with fly back generator such as the TDA8170. - Secondary switch mode power regulation. - The SMPS output synchronize a primary I.C. TEA2261 at the mains part. - This concept allows ACTIVE STANDBY facilities. - Line and frame synchronization separation. - Dual phase-locked loop horizontal scanning. - High performance frame and line synchronization with interlacing control. - Video identification circuit. - Super sandcastle. - Automatic 50-60Hz standard identification. - VCR input for PLL time constant and frame synchro switching. - Frame saw-tooth generator. - Frame blanking output. - Switching mode regulated power supply comprising error amplifier and phase modulator. - Security circuit and start-up processor. - 500kHz VCO. The circuit is supplied in a 28 pin DIP case. VCC = 12V. Synchronization Separator Line synchronization separator is clamped to black level of input video signal with synchronization pulse bottom level measurement. The synchronization pulses are divided centrally between the black level and the synchronization pulse bottom level, to improve performance on video signals in noise conditions. Frame Synchronization Time constant of Frame Separator can be adjusted by adding a capacitor pin 20. The frame timing identification logic permits automatic adaptatio to 50 - 60Hz standards or non-interlaced video. An automatic synchronization window width sys- tem provides : - fast frame capture (6.7ms wide window), - good noise immunity (0.4ms narrow window). The internal generator starts the discharge of the saw-tooth generator capacitor so that it is not disturbed by line fly-back effects. Thanks to the logic control, the beginning of the charge phase does not depend on any disturbing effect of the line fly-back. A 32µs timing is automatically applied on standardized transmissions, for perfect interlacing. In VCR mode, the discharge time is controlled by an internal monostable independent of the line frequency and gives a direct frame synchronization. Horizontal Scanning The horizontalscanning frequency is obtainedfrom the 500kHz VCO. The circuit uses two phase-locked loops (PLL) : the first one controls the frequency, the second one controls the relative phase of the synchronization and line fly-back signals. The frequency PLL has two switched time constants to provide : - capture with a short time constant, - good noise immunity after capture with a long time constant. The output pulse has a constant duration of 29µs (with C(pin 1) = 3.3nF), independent of VCC and delay in switching off the scanning transistor. Video Identification The horizontal synchronization signal is sampled by a 2µs pulse within the synchronization pulse. The signal is integrated by an external capacitor. The identification function provides three different levels : - 0V : no video identification - 6V : 60Hz video identification - 12V : 50Hz video identification This information may be used for timing research in the case of frequency or voltage synthetizer type receivers and for audio muting. Super Sandcastle with 3 levels : burst, line flyback, frame blanking In the event of vertical scanning failure, the frame blanking level goes high to protect the tube. Frame blanking time (start with reset of frame divider) is 21 lines. VCR Input This provides for continuous use of the short time constant of the first phase-locked loop (frequency). In VCR mode, the frame synchronization window widens out to a search window and there is no delay of frame fly-back (direct synchronization). 3/9 TEA2028B Frame Saw-tooth Generator The current to charge the capacitor is automatically switched to 60Hz operation to maintain constant amplitude. Switch Mode Power Supply (S.M.P.S) Secondary to Primary Regulation This power supply uses a differential error amplifier with an internal reference voltage of 1.26V and a phase modulator operating at the line frequency. The power transistor is turned off bythe falling edge of the horizontal saw-tooth. The ”soft start” device imposes a very small conduction angle on starting up, this angle progressively increases to its nominal regulation value. The maximum conduction angle may be monitored by forcing a voltage on pin 15. This pin may also be used for current limitation. The output pulse is sent to the primary I.C. TEA2261 via a low cost synchro transformer. Security Circuit And Start-up Processor When the security input (pin 28) is at a voltage below 1.26V the two outputs are simultaneously cut off until this voltage reaches the 1.26V threshold again. In this case the switch mode power supply is restarted by the ”soft start” system. If this cycle is repeated three times, the two outputs are cut off definitively. To reset the safety logic circuits, VCC must be lower than 3.5V. This circuit eliminates the risk to switch off the TV receiver in the event of a flash affecting the tube. On starting up the horizontal scanning function comes into operation at VCC = 6V. The power supply then comes into operation progressively. On shutting down, the two functionsare interrupted simultaneously after the first line fly back. Frame Blanking Safety (Pin 2) The frame blanking safety checks the normal of frame scanning. In case of any problem pin 4 and pin 11 is at a high level (frame blanking) in order to protect the tube. VCC I24 V12 I12 I10 I3 I4 I7 I28 V28 Parameter Supply Voltage (pin 8) Operating Supply Voltage (pin 8) Video Identification Current (pin 24) Positive voltage (pin 12) Line retrace current (pin 12) Line Output Current (pin 10) Frame Saw-tooth Generator (pin 3) Frame Blanking Input Current (pin 4) SMPS Output Current (pin 7) Safety Input Current (pin 28) Safety Input Voltage (pin 28) Min. Max. 14 13.2 10 Starting threshold Unit V V mA V mA mA mA mA mA mA –5 + 10 40 20 100 – 10 – 40 5 VCC THERMAL DATA Symbol Rth (j-a) Parameter Junction-ambient Thermal Resistance Value 55 Unit °C/W 2028B-02.TBL Symbol 2028B-01.TBL ABSOLUTE MAXIMUM RATINGS (limiting values) (Tamb = 25oC unless otherwise noted) ELECTRICAL OPERATING CHARACTERISTICS Tamb = 25oC, VCC = 12V (unless otherwise noted) Pulse duration at 50% of the ampifier Symbol Parameter ICC Supply Current (pin 8) (frame, line and SMPS output without load) Min. Typ. 50 Max. 80 Unit mA 0.2 -25 3 1.8 -40 6 3 -55 9 VPP µA µA 0 17 -750 -1000 25 36 – I27 I27 – I26 I26 4/9 Positive Video Input AC Coupled (output impedance of signal source < 200Ω) Negative Clamping Current (during sync pulse) Clamping Current Pin for slicing level 0.2V < V27pp < 2V (50% of sync amplitude) Negative Current Positive Current µA µA 2028B-03.TBL SYNC SEPARATOR (Pins 26-27) TEA2028B ELECTRICAL OPERATING CHARACTERISTICS (continued) Tamb = 25oC, VCC = 12V (unless otherwise noted) Pulse duration at 50% of the ampifier Symbol Parameter Min. Typ. Max. Unit FRAME SYNCHRO ADJUSTMENT (Pin 20) (V 20 = 2.5V) I20H I20L High Output Current (V27 = 12V) Low Output Current (V 27 = 0V) 7.2 – 2.8 µA µA 15.30 to 16.10 kHz VCO (Pins 17-18 and 19) Frequency control range after line divider (ceramic resonator : 503kHz) PHASE COMPARATOR ϕ 1 (Pin 22) Output Current Low Loop Gain Output Current High Loop Gain Window Pulse Width ± 0.35 ±1 7 ± 0.50 ± 1.5 10 ± 0.65 ±2 13 mA mA µs 1.7 -0.030 2.2 -0.25 2.7 -1 V mA 5 11.0 0.2 6.5 11.5 0.6 7.5 V V V 0.5 1.3 4 0.75 1.7 4.5 350 1 2.2 5 mA µs V mV 185 200 215 0.5 3.5 7.0 µA V mA 9 4 2 4.5 2.5 VCR SWITCHING (Pin 23) I23 Threshold Voltage VCR Operating Input Current (V23 = 0, VCC = 12V) VIDEO IDENTIFICATION (Pin 24) V24 V24 V24 Output Saturation Voltage (without video signal, I24 = 3mA) Output Voltage (with 60Hz video signal, I24 = 2.5mA) Output Voltage (with 50Hz video signal, I24 = 10µA) VIDEO IDENTIFICATION (Pin 25) I25 t25 V25 LHYS Output Current (charging the capacitor) Identification Time (charging the capacitor) Threshold (voltage changing from lower to higher value) Hysteresis H-RAMP GENERATOR (Pin 13) Ich13 VI13 Idis13 Charge Current Base Voltage of Saw-tooth Discharge Current SUPER SANDCASTLE (Pin 11) VB11 VL11 VBT11 Burst key pulse level Output Voltage (I11 = – 5mA) Line Blanking Pulse Level Output Voltage (I11 = – 5mA) Frame Blanking Pulse Level Output Voltage (and frame out of function) (I11 = – 5mA) 5 3 V V V 3.0 µs SUPER SANDCASTLE TB11 TO11 Delay between middle of synch pulse (Pin 27) and leading edge of burst key pulse Duration of burst key pulse Delay Between SSC Cutting Level at Pin 12 and Line Blanking Pulse Frame Blanking Time (start with reset of frame divider) 2.3 3.7 4 5 0.35 21 Line VbI12 Vϕ12 I12 I12 I12 Delay between middle of synch pulse and middle of line retrace Threshold for SMPS Safety Threshold for Blanking Threshold for PLL2 Input Current – 0.4 V < V12 < VbI12 Input Current VbI12 < V12 <Vϕ12 Input Current Vϕ12 < V12 < VCC 2.1 1.1 2.6 3.1 0.3 3 -20 -10 0 1 µs V V V µA µA µA 5/9 2028B-04.TBL POSITIVE LINE FLY BACK INPUT (Pin 12) TEA2028B ELECTRICAL OPERATING CHARACTERISTICS (continued) Symbol Parameter Min. Typ. Max. Unit 0.4 0.6 2.3 0.8 mA µs 27.5 1 29 1.5 30.5 V µs 15 16 19 µs 361 315 276 361 Line Line Line Line Line PHASE COMPARATOR ϕ 2 (Pin 16) I16 I16 Charging Current Delay Between the Edges of ϕ 1 and ϕ 2 (fVCO = 500kHz) LINE OUTPUT (open collector, Fvco = 500KHz) (Pin 10) t10 ∆t Output Voltage (I10max = 20mA) Output Pulse Duration (when fly-back pulse is with in time t10) (with C (pin 1) = 3.3nF) ϕ 2 Phase Range FRAME LOGIC Free Running Period (with mute signal) Search Window 50 Hz Window 60 Hz Window VCR Mode Window 315 247 309 247 247 FRAME SAW-TOOTH GENERATOR (Pins 3-5) I5(60) Vs Internal Current Generator (60Hz on) Discharging Current Starting Level (0 < Is < 10mA) 12 18 1 14 55 1.26 1.4 µA mA V 1.15 1.26 1.37 V 0.4 10 V mA Line 2 µA 16 FRAME BLANKING SAFETY INPUT (Pin 2) Threshold Voltage (negative going pulse) FRAME BLANKING OUTPUT (open collector) - (Pin 4) Output Saturation Voltage (I4 = 5mA) Output Current (low level) Blanking Time 21 SMPS CONTROL INPUT (Pin 9) I9 Input Current (V 9 = Vref 14) SMPS OUTPUT (Pin 7) - No relation between end of SMPS pulse (pin 7) and leading edge of line fly back (pin 12) V7 t7 Output Voltage (0 < I7 < 20mA) tON max (fVCO = 500kHz) Output Phase Range 10 26 0 30 1.20 1.26 31 V µs tON max SAFETY INPUT (Pin 28) V28 Threshold Voltage (V28 = Vref 14) Input Current (if V28 < Vref 14 then SMPS and line are switched off during the next line retrace) 1.5 3 V µA 130 µA 1.2 µA 6.5 6.5 6.5 V V V mV 1.35 V Switch-on, Switch-off Processing (Pin 15) Ich15 Ich15 Idis15 Charging Current (tc = 4µs, T = 64µs) 70 Ratio charging/discharging 0.8 1 VCC VCC VCC VHyst SMPS* and Line Starting (Pins 7 and 10) SMPS Stopping During Line Retrace Frame and Line Stopping Hysteresis between Switching-on and Switching-off Level 5.25 5.25 5.25 450 CURRENT REFERENCE (Pin 14) Vref 14 Voltage Reference (R14 = 3.32KΩ ± 1%) * Progressive Starting by Decreasing V15 6/9 1.2 1.26 2028B-05.TBL STARTING SUPPLY VOLTAGE (Pin 8) 2028B-03.EPS 220V MAINS IN TEA2261 V+ OUT VIDEO +12V +140V V CC 7 SAFETY INPUT 28 SWITCHING REGUL. POWER SUPPLY 9 TEA2028B SYNC. SEPARAT. VCO 19 27 8 18 500kHz 11 S.S.C 5 I 2L 3 FRAME MODULAT. DIVIDER + LOGIC 24 4 10 BIAS VIDEO IDENTIFICATION OUTPUT HORIZONTAL 23 VCR VERTICAL TDA8172 AMPLIFIER VCC2 FRAME YOKE V CC2 EHT TEA2028B APPLICATION WITH TDA8172 FOR B CLASS FRAME POWER AND TEA2261 FOR SECONDARY SMPS REGULATION 7/9 5.6k Ω 2028B-04.EPS INPUT VIDEO IDENTIFICAT ION 50Hz/60Hz MUTE OUTPUT V CC VCC 10µF 10pF 1.5nF 10nF 1kΩ 1.8k Ω 4.7nF SWITCH VCR SUBSTRAT GROUND 220 Ω 503kHz 220 Ω 25 24 23 22 21 20 19 18 15 14 INPUT SAFETY 28 1.26V 1 2 13 V REF 3.3nF TEA2028B 10k Ω 27 26 V CC 16 17 150pF 100nF 470 Ω 22nF 220nF 470k Ω 47k Ω 2.2k Ω 10µF 3.32k Ω 3.3nF 3 12 LR +12V SAFETY INPUT 4 5 6 7 8 9 10 11 CAST. SAND SUPER 10 V PP 390 Ω 47nF 2.2nF 1k Ω VCC +200V Pin 14 TO TEA2161 1kΩ ADJUST VOLTAGE OUTPUT SMPS 1nF 100k Ω 150k Ω 13k Ω (TEA2028B) VCC 1kΩ 100 µF 150k Ω LINE YOKE 2mH - 2.5 Ω TRANSFORMER EHT 1 7 15k Ω 6 100Ω 4 TDA8172 2 1N4001 5 470kΩ 3 LF 100µF 100nF TRANSFORMER +140V FROM SMPS 680k Ω FRAME AMPLITUDE ADJUST FRAME SAWTOOTH OUTPUT BLANKING FRAME 10k Ω 2.7M Ω 470nF 330 Ω 1kΩ VCC 33k Ω 8/9 1nF VCC 2.2Ω 100nF 1000µF 1Ω VERT. SHIFT FRAME YOKE 32µH 15Ω 0.7App +24V +200V TEA2028B APPLICATION CIRCUIT (with B class frame power) 220Ω TEA2028B I L a1 PACKAGE MECHANICAL DATA 28 PINS - PLASTIC DIP b1 b e b2 E e3 D 15 1 14 a1 b b1 b2 D E e e3 F i L Min. Millimeters Typ. 0.63 0.45 0.23 Max. Min. 0.31 0.009 1.27 Max. 0.012 0.050 37.4 16.68 15.2 Inches Typ. 0.025 0.018 1.470 0.657 0.598 2.54 33.02 0.100 1.300 14.1 4.445 3.3 0.555 DIP28.TBL Dimensions PM-DIP28.EPS F 28 0.175 0.130 Information furnished is believed to be accurate and reliable. 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