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ST Microelectronics
ST Microelectronics

TDA8145 Datasheet

TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES


TDA8145 Datasheet Preview


TDA8145
TV EAST/WEST CORRECTION CIRCUIT
FOR SQUARE TUBES
FEATURES SUMMARY
LOW DISSIPATION
SQUARE GENERATOR FOR PARABOLIC
CURRENT SPECIALLY DESIGNED FOR
SQUARE C.R.T. CORRECTION
Figure 1. Package
EXTERNAL KEYSTONE ADJUSTMENT
(symmetry of the parabola)
INPUT FOR DYNAMIC FIELD CORRECTION
)(beam current change)
t(sSTATIC PICTURE WIDTH ADJUSTMENT
cPULSE-WIDTH MODULATOR
uFINAL STAGE D-CLASS WITH ENERGY
rodREDELIVERY
PPARASITIC PARABOLA SUPPRESSION,
DURING FLYBACK TIME OF THE VERTICAL
teSAWTOOTH
bsoleDESCRIPTION
OThe TDA8145 is a monolithic integrated circuit in a
-8 pin minidip plastic package designed for use in
)the square C.R.T. east-west pin-cushion correc-
t(stion by driving a diode modulator in TV and moni-
ctor applications.
duFigure 2. Pin Connections (top view)
POWERDIP8
(Plastic Package)
solete ProKEYSTONE CORRECTION INPUT
ObFRAME SAWTOOTH CURRENT INPUT
1
2
8 NON-INVERTING INPUT 100µA CURRENT SINK
7 PARABOLA OUTPUT INVERTING INPUT
CURRENT REFERENCE
3
6 +VS
GND
4
5 OUTPUT
May 2004
REV. 2
1/9
Page 1

TDA8145
Figure 3. Schematic Diagram
TDA8145
CURRENT LIMITER
78
COMPARATOR AND OUTPUT STAGE
6 +VS
Q14 Q15
VS - 3 VBE
Q1
Q13
Q2
Q4
VREF
Q13
R5
OP2 R6
Q12
Q16
R2
Q17 Q18
D1
R4
R3
Q19
5 OUTPUT
R5 Q20
R7
1 OP1
Q21
R8
Q5
)2
t(sIIN
Q7
VS - 6 VBE
Q6
roducQ8
Q11
Q10
Q9 R9
R10 R11 R12 R13
D2
D3
Z1
IREF
OP3
Q22
lete PFULL-WAVE RECTIFIER
PARABOLA NETWORK
CURRENT REFERENCE
3
4 GND
ObsoTable 1. Absolute Maximum Ratings
-Symbol
Parameter
t(s)VS Supply Voltage
cIS Supply Current
duPTOT
Power Dissipation at Tamb = 50°C
roTSTG , Tj
Storage and Junction Temperature
te PTable 2. Thermal Data
leSymbol
Parameter
soRth (j-c)
Thermal Resistance Junction-ambient Max
Ob Rth (j-a)
Thermal Resistance Junction-pin 4 Max.
Value
35
500
500
– 25 to 150
Unit
V
mA
mW
°C
Value
100
70
Unit
°C/W
°C/W
2/9
Page 2

TDA8145
Table 3. ELECTRICAL CHARACTERISTICS
(Tamb = 25°C, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer to the test circuit unless otherwise
specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
VS Supply Voltage
17 24 30
V
IS Supply Current
4.5 7
mA
VREF Internal Reference Voltage
7.6 8.0 8.8
V
–IREF Internal Reference Current
Vref/R3
0.73 mA
V7(A) (*) Pin 7 Output Voltage
Ifr = 0 µA
15.3 16.0 16.7 V
V7(B) (*) Pin 7 Output Voltage
Ifr = 30 µA
15 V
K1
Parabola Coefficient (see Figure 5)
-V----7----A----------V----7----B--
K1 = V7A V7C
0.26
K2
t(s)V7 (*)
cI8
duVSATL
roVSATH
PVF
teIFR
Parabola Coefficient (see Figure 5)
-V----7----A----------V----7----C--
K2 = V7A V7D
V7 = V7E – V7F,
Current Source
S1 b
Saturation Voltage
Io = 400 mA Sink S2 b
Saturation Voltage
Io = 100 mA Source S2 c S1 b
Forward Voltage
Io = 400 mA S2 d S1 b
Frame Sawtooth Current
Vfr = 6.6 VPP
– 40
0.70
100
1
0.8
1.2
66
40
2
1.5
1.7
mV
µA
V
V
V
µA
oleFigure 4. Test Circuit
ObsVS
-R7 R6
t(s)10k
10k
cIFR 7 6
VF
VSATH
u2 a
rodVFR R2
S2 b
1 TDA8145 5
PR1
3
c
d
te 10k
R3
le 11k
VREF
4
8
IF -IO
o R8
Obs 20k
IO
VSATL
b
a
S1
3/9
Page 3
Part Number TDA8145
Manufactur ST Microelectronics
Description TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES
Total Page 9 Pages
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