Document
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
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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 Φ1 CAPACITOR GROUND SUBSTRAT
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2028B-01.EPS
FRAME SYNCHRO ADJ USTMENT CAPACITOR V.C.O. INPUT V.C.O. OUTPUT V.C.O. 90° REF. PHASE COMPARATOR Φ2 CAPACITOR STARTING AND SAFETY CAPACITOR
August 1993
1/9
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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
ϕ1 DET
27 VIDEO IDENTIFICATION
ϕ1 INHIBITION TIME CONSTANT SWITCHING
HORIZONTAL SYNCHRO AND FRAME SYNCHRO VCO 500kHz
17
VIDEO INPUT
2µs
SAFETY INPUT HORIZONTAL LOGIC TIMING
ϕ2
16
28
50/60Hz FRAME TIMING IDENTIFICATION LOGIC
LINE MONOSTABLE
V R 1.26V
15
3.3k Ω
VCC
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. ϕ MODULAT.
4 5
6
7
8 V CC
9
10
11 S SC OUTPUT
V CC
POWER GROUND FRAME SAWTOOTH
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HORIZONTAL OUTPUT
FRAME BLANKING 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.