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PDF TEA2028B Data sheet ( Hoja de datos )
| Número de pieza | TEA2028B | |
| Descripción | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT | |
| Fabricantes | ST Microelectronics | |
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TEA2028B
COLOR TV SCANNING AND POWER SUPPLY PROCESSOR
DEFLECTION
. CERAMIC 500kHz RESONATOR FRE-
QUENCY REFERENCE
. NO LINE AND FRAME OSCILLATOR AD-
JUSTMENT REFERENCE
. DUAL PLL FOR LINE DEFLECTION
. HIGH PERFORMANCE SYNCHRONIZATION
. SUPER SANDCASTLE OUTPUT
. FRAME BLANKING WITH SAFETY CIRCUIT
. VIDEO IDENTIFICATION CIRCUIT
. AUTOMATIC 50/60Hz STANDARD IDENTIFI-
CATION
. EXCELLENT INTERLACING CONTROL
. SPECIAL PATENTED FRAME SYNCHRO DE-
VICE FOR VCR OPERATION
. FRAME SAW-TOOTH GENERATOR
SMPS CONTROL
. ERROR AMPLIFIER AND PHASE MODULA-
TOR
. SYNCHRONIZATION WITH HORIZONTAL
DEFLECTION
. SECURITY CIRCUIT AND START-UP PROC-
ESSOR
. OUTPUT PULSES ARE SENT TO THE PRI-
MARY SMPS IC TEA2261 THROUGH A LOW
COST SYNCHRO PULSE TRANSFORMER
PIN CONNECTIONS
DESCRIPTION
The TEA2028B is a complete (horizontal and ver-
tical) deflection processor with secondary to pri-
mary SMPS control for color TV sets.
DIP28
(Plastic Package)
ORDER CODE : TEA2028B
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 SAFETY INPUT
27 VIDEO INPUT
26 H. SYNCHRO CAPACITOR (tip level)
25 VIDEO IDENTIFICATION CAPACITOR
24 MUTING + 50/60Hz IDENT. OUTPUT
23 V.C.R. INPUT
www.DataSheet4U.com22 PHASE COMPARATOR Φ1 CAPACITOR
21 GROUND SUBSTRAT
20 FRAME SYNCHRO ADJ USTMENT CAPACITOR
19 V.C.O. INPUT
18 V.C.O. OUTPUT
17 V.C.O. 90° REF.
16 PHASE COMPARATOR Φ2 CAPACITOR
15 STARTING AND SAFETY CAPACITOR
August 1993
www.DataSheet4U.com
1/9
1 page  
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) (V20 = 2.5V)
I20H High Output Current (V27 = 12V)
I20L Low Output Current (V27 = 0V)
VCO (Pins 17-18 and 19)
7.2
– 2.8
µA
µA
Frequency control range after line divider (ceramic resonator : 503kHz)
15.30 to
16.10
kHz
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
VCR SWITCHING (Pin 23)
Threshold Voltage VCR Operating
I23 Input Current (V23 = 0, VCC = 12V)
VIDEO IDENTIFICATION (Pin 24)
1.7 2.2
-0.030 -0.25
2.7 V
-1 mA
V24 Output Saturation Voltage (without video signal, I24 = 3mA)
V24 Output Voltage (with 60Hz video signal, I24 = 2.5mA)
V24 Output Voltage (with 50Hz video signal, I24 = 10µA)
VIDEO IDENTIFICATION (Pin 25)
0.2 0.6 V
5 6.5 7.5 V
11.0 11.5
V
I25 Output Current (charging the capacitor)
t25 Identification Time (charging the capacitor)
V25 Threshold (voltage changing from lower to higher value)
LHYS Hysteresis
H-RAMP GENERATOR (Pin 13)
0.5 0.75
1 mA
1.3 1.7 2.2 µs
4 4.5 5 V
350 mV
Ich13 Charge Current
VI13 Base Voltage of Saw-tooth
Idis13 Discharge Current
SUPER SANDCASTLE (Pin 11)
185 200 215 µA
0.5 V
3.5 7.0
mA
VB11 Burst key pulse level Output Voltage (I11 = – 5mA)
9V
VL11 Line Blanking Pulse Level Output Voltage (I11 = – 5mA)
4 4.5 5 V
VBT11 Frame Blanking Pulse Level Output Voltage (and frame out of function)
2
2.5
3V
(I11 = – 5mA)
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
3.0 µs
45
0.35
21 Line
POSITIVE LINE FLY BACK INPUT (Pin 12)
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 2.6 3.1 µs
1.1 V
0.3 V
3V
-20 µA
-10 µA
0 1 µA
5/9
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| PDF Descargar | [ Datasheet TEA2028B.PDF ] | |
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