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TEA2028B
COLOR TV SCANNING AND POWER SUPPLY PROCESSOR
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 PIN CONNECTIONS
LINE MONOSTABLE CAPACITOR SAFETY FRAME BLANKING INPUT FRAME SAW-TOOTH OUTPUT FRAME BLANKING OUTPUT FRAME RAMP GENERATOR GROUND POWER SWITCH MODE POWER SUPPLY OUTPUT V CC S.M.P.S. INPUT REGULATION HORIZONTAL OUTPUT S. SANDCASTLE OUTPUT HORIZONT AL FLYBACK INPUT HORIZO NTAL SAW-TOOTH CURRENT REFERENCE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15
. . . . . . . . . . . . . . .
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.
DIP28 (Plastic Package) ORDER CODE : TEA2028B
SAFETY INPUT VIDEO INPUT H. SYNCHRO CAPACITOR (tip level) VIDEO IDENTIFICATION CAPACITOR MUTING + 50/60Hz IDENT. OUTPUT V.C.R. INPUT PHASE COMPARATOR 1 CAPACITOR GROUND SUBSTRAT FRAME SYNCHRO ADJ USTMENT CAPACITOR V.C.O. INPUT V.C.O. OUTPUT V.C.O. 90 REF. PHASE COMPARATOR 2 CAPACITOR STARTING AND SAFETY CAPACITOR
2028B-01.EPS
August 1993
1/9
2/9
TEA2028B
BLOCK DIAGRAM
50/60Hz MUTING OUTPUT
VCR SWITCHING INPUT
503kHz
SUBSTRAT GROUND
25
24 23 19 18 22 21 20
TEA2028B
SUBST
VCR INPUT
H. SYNC
26
1 DET
27 VIDEO IDENTIFICATION
1 INHIBITION TIME CONSTANT SWITCHING
HORIZONTAL SYNCHRO AND FRAME SYNCHRO VCO 500kHz
17
VIDEO INPUT
2s
SAFETY INPUT HORIZONTAL LOGIC TIMING LINE MONOSTABLE
2
16
28
50/60Hz FRAME TIMING IDENTIFICATION LOGIC
V R 1.26V
15
VCC
3.3k
1
V R 1.26V
SWITCH ON/OFF SAFETY CIRCUIT SAFETY LOGIC
REFERENCE CURRENT VOLTAGE
14
2
FRAME ERROR AMPLIFIER
H. SAWTOOTH GENERATOR SOFT STARTING CIRCUIT
13
FRAME BLANKING SAFETY
FRAME SAWTOOTH OUTPUT
50/60 Hz
3 H. INHIBIT
FRAME BLANK OUTPUT
H. OUTPUT
SUPER SANDCASTLE 12 VR 1.26V
HORIZONTAL FLYBACK INPUT
FRAME SAWTOOTH OUTPUT FRAME SAFETY
S.M.P.S. OUTPUT
S.M.P.S. MODULAT.
4 5
6
7
8 V CC
9
10
11 S SC OUTPUT
V CC
POWER GROUND FRAME SAWTOOTH
FRAME BLANKING OUTPUT
HORIZONTAL OUTPUT
2028B-02.EPS
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 system 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 32s 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 29s (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 2s 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.
ABSOLUTE MAXIMUM RATINGS (limiting values) (Tamb = 25oC unless otherwise noted)
Symbol 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. Starting threshold -5 - 10 + 10 40 20 100 5 VCC Max. 14 13.2 10 Unit V V mA V mA mA mA mA mA mA
Symbol Rth (j-a)
Parameter Junction-ambient Thermal Resistance
Value 55
Unit C/W
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) SYNC SEPARATOR (Pins 26-27) - I27 I27 - I26 I26 4/9 Positive Video Input AC Coupled (output impedance of signal source < 200) Negative Clamping Current (during sync pulse) Clamping Current Pin for slicing level 0.2V < V27pp < 2V (50% of sync amplitude) Negative Current Positive Current 0.2 -25 3 0 17 1.8 -40 6 3 -55 9 VPP A A A A
2028B-03.TBL
Min.
Typ. 50
Max. 80
Unit mA
-750 -1000 25 36
2028B-02.TBL
THERMAL DATA
2028B-01.TBL
- 40
TEA2028B
ELECTRICAL OPERATING CHARACTERISTICS (continued) Tamb = 25oC, VCC = 12V (unless otherwise noted) Pulse duration at 50% of the ampifier
Symbol I20H I20L Parameter High Output Current (V27 = 12V) Low Output Current (V 27 = 0V) Frequency control range after line divider (ceramic resonator : 503kHz) PHASE COMPARATOR 1 (Pin 22) Output Current Low Loop Gain Output Current High Loop Gain Window Pulse Width VCR SWITCHING (Pin 23) I23 V24 V24 V24 I25 t25 V25 LHYS Ich13 VI13 Idis13 VB11 VL11 VBT11 Threshold Voltage VCR Operating Input Current (V23 = 0, VCC = 12V) Output Saturation Voltage (without video signal, I24 = 3mA) Output Voltage (with 60Hz video signal, I24 = 2.5mA) Output Voltage (with 50Hz video signal, I24 = 10A) Output Current (charging the capacitor) Identification Time (charging the capacitor) Threshold (voltage changing from lower to higher value) Hysteresis Charge Current Base Voltage of Saw-tooth Discharge Current 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) 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) 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 VCO (Pins 17-18 and 19)
VIDEO IDENTIFICATION (Pin 24) 5 11.0 0.5 1.3 4
VIDEO IDENTIFICATION (Pin 25) 1 2.2 5
H-RAMP GENERATOR (Pin 13) 185 3.5 9 4 2 215 0.5
SUPER SANDCASTLE (Pin 11) 4.5 2.5 5 3
SUPER SANDCASTLE TB11 2.3 3.7 4 21 2.1 1.1 2.6 0.3 3 -20 -10 0 1 3.1 3.0 5 0.35 Line s V V V A A A s
TO11
POSITIVE LINE FLY BACK INPUT (Pin 12)
5/9
2028B-04.TBL
VbI12 V12 I12 I12 I12
TEA2028B
ELECTRICAL OPERATING CHARACTERISTICS (continued)
Symbol PHASE COMPARATOR 2 (Pin 16) I16 I16 Charging Current Delay Between the Edges of 1 and 2 (fVCO = 500kHz) Output Voltage (I10max = 20mA) Output Pulse Duration (when fly-back pulse is with in time t10) (with C (pin 1) = 3.3nF) 2 Phase Range Free Running Period (with mute signal) Search Window 50 Hz Window 60 Hz Window VCR Mode Window FRAME SAW-TOOTH GENERATOR (Pins 3-5) I5(60) Vs Internal Current Generator (60Hz on) Discharging Current Starting Level (0 < Is < 10mA) Threshold Voltage (negative going pulse) FRAME BLANKING OUTPUT (open collector) - (Pin 4) Output Saturation Voltage (I4 = 5mA) Output Current (low level) Blanking Time SMPS CONTROL INPUT (Pin 9) I9 V7 t7 Input Current (V 9 = Vref 14) Output Voltage (0 < I7 < 20mA) tON max (fVCO = 500kHz) Output Phase Range Threshold Voltage (V28 = Vref 14) Input Current (if V28 < Vref 14 then SMPS and line are switched off during the next line retrace) Charging Current (tc = 4s, T = 64s) Ratio charging/discharging 10 26 0 1.20 2 A V s SMPS OUTPUT (Pin 7) - No relation between end of SMPS pulse (pin 7) and leading edge of line fly back (pin 12) 30 31 tON max 1.26 1.5 3 V A 0.4 10 21 V mA Line 12 18 1 1.15 14 55 1.26 1.26 16 1.4 1.37 A mA V V 0.4 0.6 2.3 1 29 16 315 247 309 247 247 361 315 276 361 0.8 mA s V s s Line Line Line Line Line Parameter Min. Typ. Max. Unit
LINE OUTPUT (open collector, Fvco = 500KHz) (Pin 10) t10 t 27.5 15 1.5 30.5 19
FRAME LOGIC
FRAME BLANKING SAFETY INPUT (Pin 2)
SAFETY INPUT (Pin 28) V28
Switch-on, Switch-off Processing (Pin 15) Ich15 Ich15 Idis15 VCC VCC VCC VHyst Vref 14 70 0.8 1 130 1.2 A A
STARTING SUPPLY VOLTAGE (Pin 8) 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 Voltage Reference (R14 = 3.32K 1%) 5.25 5.25 5.25 450 1.2 1.26 1.35 6.5 6.5 6.5 V V V mV V
CURRENT REFERENCE (Pin 14)
* Progressive Starting by Decreasing V15
6/9
2028B-05.TBL
EHT
+140V
500kHz VCR S.S.C 18 V+ +12V V CC 8
VCO
VIDEO IDENTIFICATION OUTPUT
19
23
11
24
HORIZONTAL
10
220V MAINS
TEA2261 I 2L
IN
OUT
27
SYNC. SEPARAT.
DIVIDER + LOGIC
VIDEO
9
SWITCHING REGUL. POWER SUPPLY
V CC2 FRAME MODULAT. 5 3 4 BIAS
TEA2028B
7 28
VERTICAL TDA8172 AMPLIFIER
SAFETY INPUT
FRAME YOKE
APPLICATION WITH TDA8172 FOR B CLASS FRAME POWER AND TEA2261 FOR SECONDARY SMPS REGULATION
VCC2
TEA2028B
7/9
2028B-03.EPS
3.3nF
47k
150pF
22nF
3.32k
CAST. 18 11
47nF
220
390
503kHz
1k
5.6k
26
27
28
1
2
3
BLANKING OUTPUT
13k 150k
33k
100nF
220nF
3.3nF
FRAME SAWTOOTH
1nF
2.2k
10k
SAFETY INPUT
SAFETY INPUT
FRAME YOKE 32H 15 0.7App
4
680k 15k
470k
100nF FRAME AMPLITUDE ADJUST 100
1000F
VERT. SHIFT 1
2028B-04.EPS
220
8/9
2.2nF EHT VCC TRANSFORMER +200V LR 10 V PP
TEA2028B
VCC
10F 470k
470
LINE YOKE 2mH - 2.5 +24V LF SUPER 12 SAND
220 1.8k
17 16 15 14 13
VCC
V REF 100F
1k
150k
1.5nF 19 10
1k
20 VOLTAGE 21 8 9 OUTPUT
SMPS
+140V FROM SMPS TRANSFORMER
10pF
GROUND
+12V
VCC
ADJUST
SUBSTRAT
10F 330
7 470nF 23 6 TO TEA2161 22
APPLICATION CIRCUIT (with B class frame power)
1k
TEA2028B
1k
V CC
VCR
10nF
SWITCH
MUTE OUTPUT 24 5 +200V
2.7M 10k
25 FRAME 4 VCC Pin 14 (TEA2028B) 2 6 7 TDA8172 1 3 5
50Hz/60Hz
IDENTIFICAT ION
4.7nF
1N4001 100F 100nF 2.2
VIDEO V CC 1.26V
INPUT
1nF 100k
TEA2028B
PACKAGE MECHANICAL DATA 28 PINS - PLASTIC DIP
a1
L
I
b1 b b2 e3 e E
D
28
15
F
1
14
Dimensions a1 b b1 b2 D E e e3 F i L
Min.
Millimeters Typ. 0.63 0.45 1.27
Max.
Min.
Inches Typ. 0.025 0.018 0.050
Max.
0.23
0.31 37.4 16.68 2.54 33.02 14.1 4.445 3.3
0.009
0.012 1.470 0.657 0.100 1.300 0.555 0.175 0.130
DIP28.TBL
15.2
0.598
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, 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. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
9/9
PM-DIP28.EPS

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