Datasheet > LND494

LND494

更新时间： 2024-10-19 05:42:27

品牌	Logo	应用领域
LINEAR_DIMENSIONS		/
页数	文件大小	规格书
6页	151K
描述
Pulse-Width-Modulation Control Circuits

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LND494 数据手册

DATA SHEET

LND494

Pulse-Width-Modulation Control Circuits

GENERAL DESCRIPTION

FEATURES

The LND494 incorporate on a single monolithic

chip all the functions required in the construction

of a pulse-width-modulation control circuit.

Designed primarily for power supply control,

these devices offer the systems engineer the

flexibility to tailor the power supply control

circuitry to his application. The LND494

•

Complete PWM Circuitry Power Control

Uncommitted Outputs for 200mA Sink

or source current

Output Control Selects Single-Ended or

Push-Pull operation

Internal Circuitry Prohibits Double

Pulse at Either Output

Variable Dead-Time Provides a stable

5-V Reference Supply, 5%

Circuit Architecture Allows Easy

Synchronization

•

contains an error amplifier, an on-chip

adjustable oscillator, a dead time control

comparator, pulse –steering control flip-flop, a 5-

volt, 5% precision regulator, and output-control

circuits. The error amplifier exhibits a common-

mode voltage range from –0.3 volts to Vcc-2

volts. The dead-time control compactor has a

fixed offset that provides approximately 5% dead

time when externally altered. The on-chip

oscillator may be by passed by terminating R_T

(pin 6) to the reference output and providing a

sawtooth input to C_T(pin 5), or it may be used to

drive the common circuits in synchronous

multiple-rail power supplies. The uncommitted

output transistors provide either common-emitter

or emitter-follower output capability. Each

device provides for push-pull or single-ended

LND494

(Top View)

NON INV INPUT

Error

Amp1

Error

Amp2

INV INPUT

output operation, which may be selected through

the output-control function. The architecture of

these devices prohibits the possibility of either

output being pulsed twice during push-pull

operation.

FEEDBACK

REF OUT

DEAD-TIME CONTROL

OUTPUT CONTROL

C_T

Vcc

R_T

GND

• Linear Dmensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

12 3 4 5 6

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