LM34927

更新时间： 2024-09-18 12:21:39

品牌	Logo	应用领域
德州仪器 - TI		转换器稳压器
页数	文件大小	规格书
17页	333K
描述
Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters

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LM34927 数据手册

April 5, 2012

LM34927

Integrated Secondary Side Bias Regulator for Isolated DC-

DC Converters

General Description

Features

The LM34927 regulator features all of the functions needed

to implement a low cost, efficient, isolated bias regulator. This

high voltage regulator contains two 100V N-Channel MOS-

FET switches - a high-side buck switch and a low-side syn-

chronous switch. The Constant-on-time (COT) control

scheme employed in the LM34927 requires no loop compen-

sation and provides excellent transient response. The regu-

lator operates with an on-time that is inversely proportional to

the input voltage. This feature allows the operating frequency

to remain relatively constant. An intelligent peak current limit

is implemented with integrated sense circuit. Other features

include a programmable input under voltage comparator to

inhibit operation during low-voltage conditions. Protection

features include thermal shutdown and V_CCUndervoltage

Lockout (UVLO). The LM34927 is offered in LLP-8 and

PSOP-8 plastic packages.

Wide 9V to 100V Input Range

■

Integrated 100V, High and Low Side Switches

No Schottky Required

Constant On-Time Control

No Loop Compensation Required

Ultra-Fast Transient Response

Nearly Constant Operating Frequency

Intelligent Peak Current Limit

Adjustable Output Voltage From 1.225V

Precision 2% Feedback Reference

Frequency Adjustable to 1MHz

Adjustable Undervoltage Lockout (UVLO)

Remote Shutdown

■

Thermal Shutdown

■

Packages

LLP-8

■

PSOP-8

Applications

Isolated Telecom Bias Supply

■

Isolated Automotive and Industrial Electronics

Typical Application

30177901

FIGURE 1. Typical Application Schematic

301779 SNVS799

www.ti.com

12 3 4 5 6 7...17

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