LM1391.PDF

February 1995

LM1391 Phase-Locked Loop

General Description

The LM1391 integrated circuit has been designed primarily

for use in the horizontal section of TV receivers, but may

find use in other low frequency signal processing applica-

tions. It includes a stable VCO, linear pulse phase detector,

and variable duty cycle output driver.

Y Output transistor with low saturation and high voltage

swing

Y APC of the oscillator with a synchronizing signal

Y DC controlled output duty cycle

Y g 300 Hz typical pull-in

Y Linear balanced phase detector

Y Low thermal frequency drift

Y Small static phase error

Y Adjustable DC loop gain

Features

Y Internal active regulator for improved supply rejection

Y Uncommitted collector of output transistor

Schematic Diagram

TL/H/7889±1

(*) Pin 4 Base of Q16 (LM1391) for use with ( a ) flyback pulse

C 1995 National Semiconductor Corporation

TL/H/7889

RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Supply Current

Flyback Input Voltage (Pin 4)

5.0 Vp-p

40 mA DC

Power Dissipation (Package Limitation)

Plastic Package (Note 1) 1000 mW

Operating Temperature Range (Ambient) 0 § Cto a 70 § C

Storage Temperature Range

Output Voltage

40 V DC

b 65 § Cto a 150 § C

Output Current

30 mA DC

Lead Temperature (Soldering, 10 sec.)

260 § C

Sync Input Voltage (Pin 3)

5.0 Vp-p

Electrical Characteristics T A e 25 § C (see test circuit, all switches in position 1)

Parameter

Conditions

Min

Typ

Max

Units

Regulated Voltage (Pin 6)

I 6 e 22 mA DC

8.0

8.6

9.2

V DC

Supply Current (Pin 6)

mA DC

Collector-Emitter Saturation Voltage

I C1 e 20 mA

0.30

0.40

V DC

of Output Transistor (Pin 1)

Pin 4 Voltage

2.0

V DC

Oscillator Pull-in Range

Adjust R H

g 300

Oscillator Hold-in Range

Adjust R H

g 900

Static Phase Error

D f e 300 Hz

0.5

m s

Free-running Frequency Supply

S1 in position 2

g 3.0

Hz/V DC

Dependance

Phase Detector Leakage (Pin 5) All switches in position 2 g 1.0 m A

Sync Input Voltage (Pin 3) 2.0 5.0 Vp-p

Sawtooth Input Voltage (Pin 4) 1.0 3.0 Vp-p

Maximum Oscillator Frequency 500 kHz

Note 1: For operation in ambient temperatures above 25 § C, the device must be derated based on a 150 § C maximum junction temperature and a thermal resistance

of 120 § C/W junction to ambient.

Typical Performance Characteristics

Frequency Drift vs Warm-Up

Output Duty Cycle vs V M

Time

Frequency vs Temperature

Voltage

TL/H/7889±3

Application Information

The following equations may be considered when using the

LM1391 in a particular application.

DC Loop Gain mb j 3.2 c 10 b 5 R O f O Hz/rad

Noise Bandwidth

R201 e R301 e

V CC b 8.6

0.02

1 a 2 q R X 2

R Y

C C mb

4R X C C

f nn j

0.6 R O C O

f O j

Hz 1.5k s R O k 51k

Damping Factor

R204 j 10 R O

C203 e C204 j

600 f O (Hz) F

K j

R X 2

R Y C C mb

Test Circuit

TL/H/7889±4

Connection Diagram

Dual-In-Line Package

TL/H/7889±2

Top View

Order Number LM1391N

See NS Package Number N08E

Typical Applications

TL/H/7889±5

FIGURE 1. TV Horizontal Processor

TL/H/7889±6

FIGURE 2. General Purpose Phase-Lock Loop

(See Applications Information)

Typical Applications (Continued)

TL/H/7889±7

FIGURE 3. Variable Duty Cycle Oscillator

(See Applications Information)

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