LM4040EIM7-2.5 National Semiconductor, LM4040EIM7-2.5 Datasheet

LM4040EIM7-2.5

Manufacturer Part Number

LM4040EIM7-2.5

Description

Manufacturer

National Semiconductor

Datasheets

1.LM4040EIM7-2.5.pdf (31 pages)

2.LM4040EIM7-2.5.pdf (10 pages)

Specifications of LM4040EIM7-2.5

Case

SOT23-3

Date_code

07+

Current page: 1 of 10
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LM5032 Interleaved Boost

Converter

Abstract

The LM5032 dual current mode PWM controller contains all

the features needed to control an interleaved boost converter.

The two outputs operate 180 degrees out of phase and have

separate current limit inputs for each channel. In addition to

a high input voltage range, the controller contains all the aux-

iliary features needed to control a complete converter.

FIGURE 1. Interleaved Boost Basic Diagram

300576

National Semiconductor

Application Note 1820

Ron Crews

May 22, 2008

Introduction

A basic boost converter converts a DC voltage to a higher DC

voltage. Interleaving adds additional benefits such as re-

duced ripple currents in both the input and output circuits.

Higher efficiency is realized by splitting the output current into

two paths, substantially reducing I

losses. Figure 1 shows the basic interleaved boost topology.

When Q1 turns on, current ramps up in L1 with a slope de-

pending on the input voltage, storing energy in L1. D1 is off

during this time since the output voltage is greater than the

input voltage. Once Q1 turns off, D1 conducts delivering part

of its stored energy to the load and the output capacitor. Cur-

rent in L1 ramps down with a slope dependent on the differ-

ence between the input and output voltage. One half of a

switching period later, Q2 also turns on completing the same

cycle of events. Since both power channels are combined at

the output capacitor, the effective ripple frequency is twice

that of a conventional single channel boost regulator.

R losses and inductor AC

30057601

www.national.com

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