Datasheet > AN-1876

AN-1876

更新时间： 2022-05-21 14:29:15

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
5页	319K
描述
The LM2841 is a PWM DC/DC buck (step-down) regulator.

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AN-1876 数据手册

User's Guide

SNVA356C–March 2009–Revised April 2013

AN-1876 LM2841 Evaluation Board

Introduction

The LM2841 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is

suitable for a wide range of applications from automotive to power conditioning from unregulated sources.

The LM2841 evaluation board is designed to provide the design engineer with a fully functional power

converter based on the buck topology to evaluate the LM2841 series of buck regulators. The evaluation

board comes populated with the LM2841YMK-ADJL but can easily be modified to accommodate any of

the LM2841 regulator ICs.

Features

•

4.5V to 42V Input Voltage Range

3.3V Output Voltage

Up to 300 mA Output Current

89% Efficiency at 300 mA

Switching Frequency of 1.25 MHz

Frequency Foldback Current Limit of 550 mA

Internal Compensation

Shutdown Operation

The evaluation board includes a 3 pin header and a jumper to select whether the device is on or off.

Placing the jumper in the "ON" position ties SHDN to VIN and enables the device. Placing the jumper in

the "OFF" position ties SHDN to GND and disables the device. The jumper may be removed and a logic

signal may be applied to the center pin to test startup and shutdown of the device.

Adjusting the Output Voltage

The output voltage can be changed from 3.3V to another voltage by adjusting the feedback resistors using

the following equation:

V_OUT= V_FB(1 + (R1/R2))

(1)

Where V_FBis 0.76V.

All trademarks are the property of their respective owners.

SNVA356C–March 2009–Revised April 2013

AN-1876 LM2841 Evaluation Board

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