LA7852 [SANYO]

CRT Display Synchronization Deflection Circuit; CRT显示器同步偏转电路


型号：	LA7852
厂家：	SANYO SEMICON DEVICE
描述：	CRT Display Synchronization Deflection Circuit CRT显示器同步偏转电路显示器商用集成电路电视监视器光电二极管
文件：	总5页 (文件大小：84K)
中文：	中文翻译
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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.

3059-DIP22S

[LA7852]

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.

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.

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.

Any duty of the horizontal pulse can be set.

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.

Pd max – Ta

Ambient temperature, Ta – °C

Built-in Functions

[Horizontal Block]

[Vertical Block]

AFC

Horizontal OSC

X-ray protector

Horizontal phase shift

AFC sawtooth wave generator

Horizontal pulse duty setting

Vertical OSC

Vertical sawtooth wave generator

Sampling type DC voltage control

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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81096HA(II)/9138YT/8228YT,TS No.2781-1/5

LA7852

Specifications

Maximum Ratings at Ta = 25°C

Parameter

Maximum supply voltage

Allowable power dissipation

Operating temperature

Symbol

, V

Conditions

Ratings

Unit

11 22

Pd max

Topr

Ta % 65° C

780

–20 to +85

–55 to +125

°C

Storage temperature

Tstg

°C

Operating Conditions at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V , V

11 22

Operating voltage range

, V

11 22

9 to 13.5

Recommended vertical pulse input peak value

Operating vertical pulse input peak value range

Recommended horizontal pulse input peak value

Operating horizontal pulse input peak value range

Vp-p

PULSE

2 to 6

Operating Characteristics at Ta = 25°C, V₁₁, V₂₂= 12 V

Parameter

Symbol

Conditions

min

typ

max

Unit

current dissipation

30 mA

12 mA

CC11

CC22

Vertical frequency pull-in range

Vertical free-running frequency

Vertical sync 60 Hz

fv center 55 Hz

10.0

12.0

Increased/reduced voltage

characteristic of vertical

frequency

∆fv-v

= 12 ± 1 V, 55 Hz at 12 V

–0.1

3.8

+0.1

Midpoint control

threshold level

4.4

4.0

Vertical OSC start voltage

Fvcst

Temperature characteristic of

vertical frequency

Ta = –10 to +60°C

–0.028

+0.028 Hz/°C

18 dB

Vertical driver

amplification factor

0.85

–1.6

1.6 mA

AFC

Horizontal AFC DC loop gain

–

–0.85 mA

AFC

Horizontal free-running

frequency

center 15.734 kHz

–750

+750

4.0

Horizontal OSC start voltage

f cst

Increased/reduced voltage

characteristic of horizontal

frequency

∆f cv

= 12 ± 1 V, 15.734 kHz at 12 V

–50

+50

Horizontal OSC warm-up drift

∆f

5 s to 30 min. after application of power

Ta = –10 to +60°C

–50

–2.9

6.0

Temperature characteristic of

horizontal frequency

+2.9 Hz/°C

12.0 mA

Horizontal output drive current

Increased/reduced voltage

characteristic of phase shifter

delay time

= 12 ± 1 V

–0.5

–0.1

–1.0

+0.5 %/V

+0.1 %/°C

+1.0 %/V

+0.13 %/°C

Temperature characteristic of

phase shifter delay time

Ta = –10 to +60°C

Increased/reduced voltage

characteristic of phase shifter

delay time

= 12 ± 1 V

Temperature characteristic of

phase shifter pulse width

Ta = –10 to +60°C

–0.13

9.9

AFC phase comparison center

time

15.734 kHz after FBP input

11.5

µs

No.2781-2/5

LA7852

Parameter

Symbol

Conditions

min

typ

max

+1.5

Unit

%/V

Increased/reduced voltage

characteristic of AFC phase

comparison center time

= 12 ± 1 V

–1.5

Temperature characteristic of

AFC phase comparison center

time

Ta = –10 to +60°C

–0.2

+0.2

%/°C

Comparison waveform

generating

input operation voltage

0.6

0.5

0.9

0.8

Pin 14 voltage at hold-down

operation start

Equivalent Circuit Block Diagram

No.2781-3/5

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: Ω, capacitance: F)

No.2781-4/5

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

Package

LA7850

LA7851

LA7852

LA7853

DIP-20S

DIP-22S

(Slim Type)

(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 products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,

nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or

indirectly cause injury, death or property loss.

Anyone purchasing any products described or contained herein for an above-mentioned use shall:

1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors

and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and

expenses associated with such use:

2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO

ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume

production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use

or any infringements of intellectual property rights or other rights of third parties.

This catalog provides information as of August, 1996. Specifications and information herein are subject to change without notice.

No.2781-5/5

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