LM3101N

更新时间： 2024-11-23 04:20:11

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
20页	306K
描述
Secondary-Side PWM Controller

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LM3101N 数据手册

January 1995

LM3101 Secondary-Side PWM Controller

General Description

Features

2% precision voltage reference

The LM3101 is a precision high-speed PWM controller. It is

designed to provide secondary-side feedback for offline

Switch-Mode Power Supplies (SMPS) using pulse communi-

cation to the primary-side driver. The LM3101 is applicable

in all of the popular converter topologies such as flyback or

forward.

Wide-bandwidth (8 MHz) error amplifier

External synchronization

Frequency shift during an output short circuit

Power-on reset flag with programmable delay

Overvoltage crowbar trigger circuit

Ramped reference Soft-Start

The LM3101 combined with its companion LM3001 Primary-

Side Driver forms a regulator chip-set that provides preci-

sion control of offline or other isolated DC/DC converters.

The communication is realized between the two chips by a

small pulse transformer, with one or two turns on its primary

and secondary. This type of communication does not intro-

duce any poles or zeroes in the control loop and yields the

fastest possible loop response for the isolated switching

regulator.

Operation beyond 1 MHz

Voltage, current, or charge mode control

Typical Applications

Isolated offline switching power supplies

Isolated DC/DC power converters

Flyback regulator

The secondary-side controller contains a precision 1.242V

reference, an error amplifier, and a trimmed oscillator which

is programmed with a single resistor. The LM3101 can real-

ize voltage, current or charge mode control. Power supply

monitor features include power-on reset with programmable

delay and overvoltage protection.

Forward converter

Block Diagram

TL/H/11436–1

1995 National Semiconductor Corporation

TL/H/11436

RRD-B30M75/Printed in U. S. A.

12 3 4 5 6 7...20

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