LA7852.pdf

Ordering number: EN2781B

Monolithic Linear IC

LA7852

CRT Display Synchronization Deflection Circuit

Overview

Package Dimensions

unit : mm

The LA7852 is a sync-deflection circuit IC dedicated to CRT

display use. It can be connected to the LA7832/7833, 7837/

7838 (for vertical output use) to form a sync-deflection circuit

that meets every requirement for CRT display use.

So far, ICs for color TV use have been applied to the sync-

deflection circuit for CRT display use, and general-purpose ICs

such as one-shot multivibrator, inverter and a lot of transistors

have been used to form the peripherals such as sync input

interface, horizontal phase shifter. The LA7852 contains these

peripherals on chip and adopts a stable circuit for horizontal

oscillation from 15 kHz to 100 kHz aiming at improving the

characteristics required for CRT display use.

The LA7852 has independent GND pins for the horizontal

block and vertical block, thus facilitating pattern layout for

applications where the LA7852 is used at high frequencies.

3059-DIP22S

[LA7852]

21.2

0.95

0.48

1.78

1.7

SANYO : DIP22S

Features

. The vertical pull-in range is approximately 10 Hz at

fv = 60 Hz.

. The horizontal oscillation frequency can be adjusted stably

from 15 kHz to 100 kHz.

. The horizontal display can be shifted right/left.

Pd max – Ta

. The horizontal/vertical sync input can be used intact

regardless of the difference in pulse polarity and pulse width.

. The AFC feedback sawtooth wave can be obtained by

simply applying a flyback pulse to the IC as a trigger pulse.

. Good vertical linearity because DC bias at vertical output

stage is subjected to sampling control within retrace time.

. Excellent interlace and vertical jitter characteristics on the

high-definition display because of independent GND pins for

the horizontal block and vertical block.

Ambient temperature, Ta – °C

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

81096HA(II)/9138YT/8228YT,TS No.2781-1/6

. Any duty of the horizontal pulse can be set.

LA7852

Built-in Functions

[Horizontal Block]

. AFC

. Vertical sawtooth wave generator

. X-ray protector

. Sampling type DC voltage control

. Horizontal phase shift

. AFC sawtooth wave generator

. Horizontal pulse duty setting

Specifications

Maximum Ratings at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

V 11 ,V 22

Allowable power dissipation

Pd max Ta % 65° C

780 mW

Operating temperature

Topr

–20 to +85

°C

Storage temperature

Tstg

–55 to +125

°C

Operating Conditions at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V 11 ,V 22

Operating voltage range

V 11 ,V 22

9 to 13.5

Recommended vertical pulse input peak value V PULSE

Vp-p

Operating vertical pulse input peak value range V PULSE

2 to 6

Vp-p

Recommended horizontal pulse input peak value H PULSE

Vp-p

Operating horizontal pulse input peak value range H PULSE

2 to 6

Vp-p

Operating Characteristics at Ta = 25°C, V 11 ,V 22 =12V

Parameter

Symbol

Conditions

min typ max Unit

V CC11 current dissipation

I 11

30 mA

V CC22 current dissipation

I 22

12 mA

Vertical frequency pull-in range Vp IN Vertical sync 60 Hz

10.0

12.0 Hz

Vertical free-running frequency

fv fv center 55 Hz

60 Hz

Increased/reduced voltage

characteristic of vertical

frequency

D fv-v V 22 =12 ± 1 V, 55 Hz at 12 V

–0.1

+0.1 Hz

Midpoint control

threshold level

3.8

4.4 V

Vertical OSC start voltage

Fv c st

4.0 V

Temperature characteristic of

vertical frequency

Ta = –10 to +60°C

–0.028

+0.028 Hz/°C

Vertical driver

amplification factor

18 dB

Horizontal AFC DC loop gain

I AFC +

0.85

1.6 mA

I AFC –

–1.6

–0.85 mA

Horizontal free-running

frequency

f H f H center 15.734 kHz

–750

+750 Hz

Horizontal OSC start voltage

f H c st

4.0 V

Increased/reduced voltage

characteristic of horizontal

frequency

D f H c v 11 =12 ± 1 V, 15.734 kHz at 12 V

–50

+50 Hz

Horizontal OSC warm-up drift

D f H 5 s to 30 min. after application of power

–50

+50 Hz

Temperature characteristic of

horizontal frequency

Ta = –10 to +60°C

–2.9

+2.9 Hz/°C

Horizontal output drive current

I 13

6.0

12.0 mA

Continued on next page.

No.2781-2/6

. Horizontal OSC

[Vertical Block]

. Vertical OSC

LA7852

Continued from preceding page.

Parameter

Symbol

Conditions

min typ max Unit

Increased/reduced voltage

characteristic of phase shifter

delay time

V 11 =12

1 V

–0.5

+0.5 %/V

Temperature characteristic of

phase shifter delay time

Ta = –10 to +60°C

–0.1

+0.1 %/°C

Increased/reduced voltage

characteristic of phase shifter

delay time

V 11 =12 ± 1 V

–1.0

+1.0 %/V

Temperature characteristic of

phase shifter pulse width

Ta = –10 to +60°C

–0.13

+0.13 %/°C

AFC phase comparison center

time

15.734 kHz after FBP input

9.9

11.5 µs

Increased/reduced voltage

characteristic of AFC phase

comparison center time

V 11 =12

1 V

–1.5

+1.5 %/V

Temperature characteristic of

AFC phase comparison center

time

Ta = –10 to +60°C

–0.2

+0.2 %/°C

Comparison waveform

generating

input operation voltage

V 5

0.6

0.9 V

Pin 14 voltage at hold-down

operation start

V 14

0.5

0.8 V

Equivalent Circuit Block Diagram

No.2781-3/6

LA7852

Sample Application Circuit

14’’ Color Monitor / fv = 60 Hz, f H = 15.734 kHz

(Note)

Co is connected when

oscillation occurs in vertical

output in Sample Application

Circuit.

( ): Negative pulse

mode

VR2 is fixed after adjustment.

(Note) For the LA7853, the vertical pull-in range is

20 Hz at vertical sync 60 Hz.

Unit (resistance:

, capacitance: F)

No.2781-4/6

LA7852

Sample Application Circuit

14’’ Color Monitor / fv = 60 Hz, f H = 15.734 kHz

( ): Negative pulse mode

VR2 is fixed after adjustment

A05903

LA7850 Family

Type Number

LA7850

LA7851

LA7852

LA7853

Package

DIP-20S

(Slim Type)

DIP-20S

(Slim Type)

DIP-22S

(Shrink Type)

DIP-22S

(Shrink Type)

Differences in

characteristics

Vertical

pull-in range

(fv = 60 Hz)

10 Hz

20 Hz

10 Hz

20 Hz

Ground pin

Horizontal/vertical

common

horizontal/vertical

common

Horizontal/vertical

separated

Horizontal/vertical

separated

No.2781-5/6

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