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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
.. LOW DISSIPATION
SQUARE GENERATOR FOR PARABOLIC
CURRENT SPECIALLY DESIGNED FOR
SQUARE C.R.T. CORRECTION
. EXTERNAL KEYSTONE ADJUSTMENT
(symmetry of the parabola)
. INPUT FOR DYNAMIC FIELD CORRECTION
(beam current change)
. STATIC PICTURE WIDTH ADJUSTMENT
. PULSE-WIDTH MODULATOR
. FINAL STAGE D-CLASS WITH ENERGY
REDELIVERY
. PARASITIC PARABOLA SUPPRESSION,
DURING FLYBACK TIME OF THE
VERTICAL SAWTOOTH
POWERDIP8 (Th = 0.4mm)
(Plastic Package)
ORDER CODE : TDA8145
DESCRIPTION
The 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 correction
by driving a diode modulator in TV and monitor
applications.
PIN CONNECTIONS (top view)
KEYSTONE CORRECTION INPUT
FRAME SAWTOOTH CURRENT INPUT
CURRENT REFERENCE
GND
1
2
3
4
8 NON-INVERTING INPUT 100µA CURRENT SINK
7 PARABOLA OUTPUT INVERTING INPUT
6 +VS
5 OUTPUT
October 1998
1/5
Page 1

TDA8145
SCHEMATIC DIAGRAM
TDA8145
CURRENT LIMITER
78
COMPARATOR AND OUTPUT STAGE
VS - 3 VBE
Q1
Q13
Q2
Q4
R5
1 OP1
Q5
VREF
Q13
Q14 Q15
Q16
R2
Q17 Q18
D1
R5
OP2 R6
Q12
R7
Q21
R4
R3
Q19
Q20
R8
2
IIN
Q7
VS - 6 VBE
Q6
Q8
Q11
Q10
Q9 R9
R10 R11 R12 R13
D2
D3
Z1
OP3
IREF
Q22
6 +VS
5 OUTPUT
4 GND
FULL-WAVE RECTIFIER
PARABOLA NETWORK
CURRENT REFERENCE
3
ABSOLUTE MAXIMUM RATINGS
Symbol
Vs
Is
Ptot
Tstg, Tj
Parameter
Supply Voltage
Supply Current
Power Dissipation at Tamb = 50 °C
Storage and Junction Temperature
Value
35
500
500
– 25 to 150
Unit
V
mA
mW
°C
THERMAL DATA
Symbol
Rth (j–c)
Rth (j–a)
Parameter
Thermal Resistance Junction-ambient
Thermal Resistance Junction-pin 4
Max.
Max.
Value
100
70
Unit
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer
to the test circuit unless otherwise specified)
Symbol
VS
IS
Vref
– Iref
V7(A) (*)
V7(B) (*)
Parameter
Supply Voltage
Supply Current
Internal Reference Voltage
Internal Reference Current
Pin 7 Output Voltage
Pin 7 Output Voltage
Vref/R3
Ifr = 0 µA
Ifr = 30 µA
Test Conditions
Min.
17
7.6
15.3
Typ.
24
4.5
8.0
0.73
16.0
15
Max.
30
7
8.8
16.7
Unit
V
mA
V
mA
V
V
2/5
Page 2

TDA8145
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer
to the test circuit unless otherwise specified) (continued)
Symbol
Parameter
K1
Parabola Coefficient
(see Figure 2)
K2
V7 (*)
I8
VSATL
VSATH
VF
Ifr
Parabola Coefficient
(see Figure 2)
Current Source
Saturation Voltage
Saturation Voltage
Forward Voltage
Frame Sawtooth Current
Test Conditions
K1
=
V7A
V7A
V7B
V7C
K2
=
V7A
V7A
V7C
V7D
V7 = V7E – V7F
S1 b
Io = 400 mA Sink
Io = 100 mA Source
Io = 400 mA
Vfr = 6.6 Vpp
S2 b
S2 c
S2 d
Min. Typ. Max. Unit
0.26
0.70
– 40
S1 b
S1 b
100
1
0.8
1.2
66
40
2
1.5
1.7
mV
µA
V
V
V
µA
Figure 1 : Test Circuit
VS
R7 R6
10k
10k
IFR 7 6
VF
VSATH
2a
VFR R2
S2 b
1 TDA8145 5
R1
c
d
3
10k
R3
11k
VREF
4
8
IF -IO
R8
20k
IO
VSATL
Figure 2 : Parabola Characteristics
b
a
S1
V7 (V)
V7A
V7B
V7C
V7D
V7E
-60
36
0 15 30
V7F
60 IFR (µA)
3/5
Page 3
Part Number TDA8145
Manufactur ST Microelectronics
Description TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES
Total Page 5 Pages
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