ICs for TV

■

Overview

The AN5790N and AN5792 are the intergrated circuits

designed for CRT display horizontal signal processing cir-
cuits.

■

Features

•

Horizontal synchronous signal is available in both polar-

ities.

•

Wide range of horizontal osciallation frequency : 14kHz

to 60kHz.

•

Output pulse width : 2µs to 40µs

•

Package

AN5790N...NF-12S(12-Pin SIL plastic package)

AN5792...F-12S (12-Pin SIL plastic package with fin)

AN5790N, AN5792

Horizontal Signal Processing ICs for CRT Display

1

2

3

4

5

6

7

8

9

10

11

12

1.7

±

0.25

2.54

1.2

±

0.25

7.9

±

0.3

3.5

±

0.25

1.2

±

0.25

0.5

±

0.1

0.45

+ 0.1

– 0.05

1.7

±

0.25

Unit : mm

29.4

±

0.3

12-Pin SIL Plastic Package (12-SIP)

AN5790N

6

5

8

7

10

9

11

12

4

3

2

1

V

CC

GND

Polarity
Switch

X-ray
Protector

Pre-Amp.

AFC

Hor. Osc.

PulseWidth
Adjustment

■

Block Diagram

1

2

3

4

5

6

7

8

9

10

11

12

ø3.3

1.7

±

0.25

2.54

1.2

±

0.25

5.8

±

0.25

7.9

±

0.3

3.5

±

0.25

1.2

±

0.25

0.5

±

0.1

29.4

±

0.3

0.45

+ 0.1 – 0.05

1.7

±

0.25

28.0

±

0.3

AN5792

12-Pin SIL Plastic Package with Fin (12-SIF (f))

Unit : mm

ICs for TV

AN5790N, AN5792

Parameter

Symbol

Rating

Unit

V

CC

I

CC

P

D

T

opr

T

stg

Power dissipation

Supply current

Supply voltage

Operating ambient temperature

Storage temperature

Temperature

13.2

1140

– 20 to +70

– 40 to +150

V

mW

˚C

˚C

mA

50

■

Absolute Maximum Ratings

(Ta= 25˚C)

V

2-7

V

2-7

Positive polarity signal input

Negative polarity signal input

Total circuit current

Polarity switching voltage (1)

Polarity switching voltage (2)

0

2.5

0.4

5.5

V

V

Parameter

min

Condition

typ

max

Unit

Symbol

V

OSC-S (H)

f

HO

=12kHz to 19kHz

Horizonal oscillation start voltage

7.5

V

f

HO (1)

V

CC

=11V, C= 4400pF

Horizonal oscillation frequency

15

15.75

16.5

kHz

f

HO (2)

V

CC

=11V, C= 820pF, 5600pF

14

60

kHz

I

tot

V

CC

=11V

30

45

60

mA

∆

f

HO

/V

CC

f

HO

=15.75kHz, f

HO

| 9.9V– f

HC

| 12.1V

f

HO

supply voltage dependency

40

130

Hz

∆

f

HO

/Ta

f

HO

=15.75kHz, f

HO

| –20˚C – f

HC

| 60˚C

260

Hz

β

∆

I

O

=

±

25

µ

A

Oscillation frequency control sensitivity

16

17.6

19.3

Hz/

µ

A

f

DC

µ

× β

DC loop gain

700

Hz/

µ

s

τ

HO (1)

V

CC

=11V, R= 20k

Ω

, C= 6800pF

Output pulse width

17.8

19.4

21.2

µ

s

τ

HO (2)

V

CC

=11V, R=20k

Ω

, C=330pF, 18000pF

Output pulse width

2

40

µ

s

∆τ

HO

/V

CC

V

CC

= 9.9V to 12.1V

Output pulse width variation to supply voltage change

5

%

∆τ

HO

/Ta

V

CC

=11V, Ta= – 20˚C to + 60˚C

Output pulse width variation to temeprature change

5

%

V

8-7

V

CC

=11V, V

10-7

=1V

Oscillation output saturation voltage

2

V

I

8-7

V

CC

=11V, V

10-7

=1V

Oscillation output drive current

300

mA

V

6-7

V

CC

=11V

X-ray protecting circuit operation start voltage

0.5

0.64

0.75

V

Horizonal oscillation frequency

f

HO

ambient temperature dependency

■

Electrical Characteristics

(Ta= 25˚C)

■

Application Circuit

27k

Ω

+
–

4.7

µ

F

V

CC

(11V)

AN5790N/AN5792

+
–

+

–

20k

Ω

2k

Ω

2.7k

Ω

33k

Ω

39pF

2700pF
(Styrol Cap.)

2700pF
(Mylar Film Cap.)

Output

Hor. Sync. Signal

FBK Pulse Input

3.3k

Ω

0.033

µ

F

0.018

µ

F

0.015

µ

F

220

µ

F/16V

33

µ

F/50V

1

2

3

4

5

6

7

8

9

10

11

12

ICs for TV

AN5790N, AN5792

Horizontal
synchronous
signal input pin

Polarity
discrimination
switching pin

Flyback pulse
input pin

AFC output pin

Supply voltage

X-ray protecting
circuit input pin

Horizontal drive
output pin

Both polarities of an input signal of
Pin1 are made available by connect-
ing this pin to GND or setting it to
OPEN

Flyback feedback pin.
The standard value of amplitude is
1.5Vpp.

Result of AFC detection.

When a voltage of 0.75V or more is
applied, no horizonal output will
not be generated.

Current when turned ON should be
used at 300mA or less.

1

2

3

4

6

8

Pin No.

Pin name

Typ. waveform

Description

Equivalent circuit

5

7

GND

DC

DC

DC

DC

5V

0V

8

6

4

3

2

1

5V

4k

Ω

5V

4k

Ω

5.9V

200

Ω

680

Ω

2

Ω

DC

Pin for inputting a horizontal syn-
chronous signal.

■

Pin Descriptions

ICs for TV

AN5790N, AN5792

Trigger input pin

Pulse width
adjusting pin

Sawtooth wave
generating pin

Horizontal
oscillation circuit
reference voltage

The output pulse width can be
changed by the capacitance
between Pins9 and 10 and resist-
ance berween Pin10 and V

CC

.

Oscillation frequency is changed by
the resistor between this pin and
GND.

Oscillation frequency can be
changed by the capacitor to be
connected to this pin.

9

10

11

12

Pin No.

Pin name

Typ. waveform

Description

Equivalent circuit

DC

10

3.3V

9

11

12

1k

Ω

■

Pin Descriptions (cont.)