Datasheet TDA8145 Datasheet (SGS Thomson Microelectronics)

TV EAST/WEST CORRECTION CIRCUIT

.

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 FI ELD CORRECTION
(beam current change)

.

STATIC PICTURE WIDTH ADJUSTMENT

.

PULSE-WIDTH MODULATOR

.

FINAL STAGE D-CLASS WITH ENERGY
REDELIVERY

.

P ARASITIC PARABOLA SUPPRESSION,
DURING FLYBACK TIME OF THE
VERTICAL SAWTOOTH

TDA8145

FOR SQUARE TUBES

POWERDIP8

(Plastic Package)

(Th = 0.4mm)

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

ORDER CODE :

8

NON-INVERTING INPUT 100

7

PARABOLA OUTPUT INVERTING INPUT
+V

6
5

S

OUTPUT

TDA8145

A CURRENT SINK

µ

October 1998

8145-01.EPS

1/5

TDA8145

SCHEMATIC DIAGRAM

TDA8145

1

2

I

IN

VS - 3 V

Q7

CURRENT LIMITER

BE

OP1

VS - 6 V

BE

Q1

Q2

R5

Q5

Q6

Q8 Q9

Q4Q13

Q10

7

R9

8

COMPARATOR AND OUTPUT STAGE

V

OP2

Q11

R10 R11 R12 R13

+V

6

S

Q14

Q13

REF

R5

R6

Q12

R7

R2

Q21

D2
D3

Z1

Q15

Q16

Q20

Q22

D1

OUTPUT

5

I

REF

4

GND

Q18Q17

R3

R4

Q19

R8

OP3

FULL-WAVE RECTIFIER

PARABOLA NETWORK

CURRENT REFERENCE

3

ABSOL UT E MAXIMU M RATINGS

Symbol Parameter Value Unit

V

s

I

s

P

tot

, TjStorage and Junction Temperature – 25 to 150

T

stg

Supply Voltage 35 V
Supply Current 500 mA
Power Dissipation at T

= 50 °C 500 mW

amb

THERMAL DATA

Symbol Parameter Value Unit

R

th (j–c)

R

th (j–a)

ELECTRICAL CHARACTERISTICS (T

Thermal Resistance Junction-ambient Max. 100
Thermal Resistance Junction-pin 4 Max. 70

= 25oC, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer

amb

°
°

to the test circuit unless otherwise specified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

– I

V

7(A)

V

7(B)

Supply Voltage 17 24 30 V

S

I

Supply Current 4.5 7 mA

S

Internal Reference Voltage 7.6 8.0 8.8 V

ref

Internal Reference Current V

ref

(*)

Pin 7 Output Voltage Ifr = 0 µA 15.3 16.0 16.7 V

(*)

Pin 7 Output Voltage Ifr = 30 µA15V

/R3 0.73 mA

ref

C

°

C/W
C/W

8145-02.EPS

8145-01.TBL

8145-02.TBL

8145-03.TBL

2/5

TDA8145

ELECTRICAL CHARACTERISTICS (T

= 25oC, VS = 26V, Vfr = 0, S1 and S2 in "a" position, refer

amb

to the test circuit unless otherwise specified) (continued)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

− V

7A

V7A − V

− V

V

7A

V7A − V

pp

7B
7C

7C
7D

7F

0.26

0.70

– 40 40 mV

b 0.8 1.5 V

→

b 1.2 1.7 V

→

66

K

K2

V

∆

V

SATL

V

SATH

V

Parabola Coefficient

1

(see Figure 2)
Parabola Coefficient

(see Figure 2)

(*)

7

I

Current Source S1 → b 100

8

Saturation Voltage Io = 400 mA Sink S2 → b12V
Saturation Voltage Io = 100 mA Source S2 → cS1
Forward Voltage Io = 400 mA S2 → dS1

F

I

Frame Sawtooth Current Vfr = 6.6 V

fr

K1 =

K

=

2

V7 = V7E – V

∆

Figure 1 : T es t Circuit

V

S

R7 R6

10kΩ 10kΩ

I

FR

V

FR

R1

10k

Ω

R3

11k

Ω

R2

V

REF

2

1

3

7

TDA8145

V

R8
20k

F

5

Ω

6

84

V

SATH

a

S2

d

I

F

b
c

-I

O

I

O

V

SATL

A

µ

A

µ

8145-04.TBL

Figure 2 : Parabola Characteristics

V

7E

-60 0 15 30

a

V7 (V)

V

7A

S1

b

8145-03.EPS

V

7B

V

7C

V

7D

V

7F

36

60

I

FR

(µA)

8145-04.EPS

3/5

TDA8145

APPLICATION CIRCUIT WITH KEYSTONE CORRECTION

Line Transformer

(L.T.)

LM

L1
10mH

R3 RT2

Pin-cushion

adjustment

V

FRAME

R1 =

66µA

PP

V
Pin 1
Voltage

FRAME

Keystone

Adj.

CIRCUIT OPERATION (see the schematic diagram)
A differential amplifier OP1 is driven by a vertical

frequency sawtooth current of ± 33µA which is
produced via an external res istor from the sawtooth
voltage. The non–inverting input of this amplifier is
connected with a reference voltage corresponding
to the DC level of the sawtooth voltage. This DC
voltage should be adjustable for the keystone cor­rection. The rectified output current of this amplifier
drives the parabola network which provides a para­bolic output current.

This output current produces the corresponding
voltage due to the voltage drop across the external
resistor at pin 7.

If the input is overmodulated (> 40µA) the internal

4.7k

5

2

TDA8145

1

3 4 8

RT1

100k

Ω

R2
12k

Ω

Ω

47k

Hfly
from L.T.

Ω

7

R5 RT3

C3

4.7nF

R4
18k

Ω

6

C2
100nF

D1
1N4148

1k

Ω

H. Width

current is limited to 40µA. This limitation can be
used for suppressing the parasitic parabolic current
generated during the flyback time of the frame
sawtooth.

A comparator OP2 is driven by the parabolic cur­rent. The second input of the comparator is con­nected with a horizontal frequency sawtooth
voltage the DC level of whic h can be changed by
the external circuitry for t he adjus tment of the pic­ture width.

The horizontal frequency pulse–width modulated
output signal drives the final stage. It consists of a
class D push–pull output amplifier that drives, via
an external inductor, the diode modulator.

C1
47nF

V

S

8145-05.EPS

4/5

TDA8145

PACKAGE MECHANICAL DATA

8 PINS - PLASTIC POWERDIP

Dimensions

Min. Typ. Max. Min. Typ. Max.

A 3.3 0.130

a1 0.7 0.020

B 1.39 1.65 0.055 0.065

B1 0.91 1.04 0.036 0.041

b 0.5 0.020

b1 0.38 0.5 0.015 0.020

D 9.8 0.386
E 8.8 0.346

e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300

F 7.1 0.280

I 4.8 0.189
L 3.3 0.130
Z 0.44 1.6 0.017 0.063

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2

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Millimeters Inches

The ST logo is a registered trademark of STMicroelectronics

© 1998 STMicroelectronics - All Rights Reserved

2

2

the I

C Standard Specifications as defined by Phili ps.

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C system, is granted provided that the system conforms to

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5/5

PM-DIP8.EPS

DIP8PW.TBL