LM2675-5.0EVAL National Semiconductor, LM2675-5.0EVAL Datasheet

LM2675-5.0EVAL

Manufacturer Part Number

LM2675-5.0EVAL

Description

EVALUATION BOARD FOR LM2675-5.0

Manufacturer

National Semiconductor

Series

SIMPLE SWITCHER®r

Datasheets

1.LM2675LD-5.0.pdf (26 pages)

2.LM2675-5.0EVAL.pdf (2 pages)

Specifications of LM2675-5.0EVAL

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Voltage - Output

Current - Output

Voltage - Input

8 ~ 40V

Regulator Topology

Buck

Frequency - Switching

260kHz

Board Type

Fully Populated

Utilized Ic / Part

LM2675

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Other names

*LM2675-5.0EVAL
*LM2675-5.0EVAL/NOPB
LM2675-5.0EVAL/NOPB

Current page: 1 of 2
Download datasheet (45Kb)

LM2675-5.0EVAL 1A

Step-Down High-Efficiency

SIMPLE SWITCHER

Evaluation Board

Introduction

The LM2675 SIMPLE SWITCHER step-down regulator pro-

vides all the active functions for a step-down regulator ca-

pable of driving a 1A load with excellent line and load regu-

lation. Switching frequency is internally set to 260 kHz,

allowing smaller-sized filter components than would be

needed with lower-frequency switching regulators. The inter-

nal switch is an 0.25Ω DMOS device, providing very

high-efficiency power conversion. With this high efficiency,

the copper traces on the printed circuit board are the only

heat sinking needed.

The LM2675-5.0EVAL evaluation board is a fully-assembled

and tested surface-mount regulator that provides a

overall efficiency is typically as high as 90%. The operating

temperature range is 0˚C to +85˚C.

Evaluation Board Design

This evaluation board is designed for supplying 5V at up to 1

Amp to a load. The input voltage range is 8V to 40V. Com-

ponents, shown in the schematic of Figure 1, were selected

based on the design procedure in the LM2675 datasheet.

Layout is very important in switching regulator designs. Rap-

idly switching currents associated with wiring inductance can

SIMPLE SWITCHER

Designator

1.5% output at up to 1A, from an input of 8V to 40V. The

OUT

is a registered trademark of National Semiconductor Corporation

LM2675M-5.0 National Semiconductor SIMPLE SWITCHER voltage converter

15 µF, 50V Solid Tantalum, Sprague type 594D

68 µF, 16V Solid Tantalum, Sprague type 595D

1A, 40V Schottky rectifier

47 µH Power Inductor, Coilcraft D03316-473

0.01 µF, 50V Ceramic

AN101048

FIGURE 1. LM2675-5.0EVAL Schematic

TABLE 1. Parts List (Bill of Materials)

Description

National Semiconductor

Application Note 1120

Wanda Garrett

February 1999

generate voltage transients which can cause problems. For

minimal inductance and ground loops, the traces which carry

the highest currents (input, ground, switch, and output sig-

nals) are relatively wide and short. The external components

are located physically close to the IC.

Components in this design were selected according to the

design procedure in the LM2675 datasheet. The input ca-

pacitor C

rent rating. A 40V maximum input requires a capacitor with

voltage rating of at least 1.25x40, or 50V. A conservative

estimate of RMS input current is approximately

load current. The input capacitor chosen for this application

has a voltage rating of 50V and an RMS current rating of 900

mA. The inductor and output capacitor were selected for a

combination of good regulator stability and compact size,

according to the design tables in the datasheet.

While the LM2675 has an ON/OFF control, this has not been

provided on the evaluation board.

The parts list for this board is given in Table 1, while contact

information for the component manufacturers is given in

Table 2.

was chosen for its voltage rating and RMS cur-

10104801

www.national.com

Quantity

⁄

the DC

Related parts for LM2675-5.0EVAL

LM2675-5.0EVAL Summary of contents

Page 1

... DMOS device, providing very high-efficiency power conversion. With this high efficiency, the copper traces on the printed circuit board are the only heat sinking needed. The LM2675-5.0EVAL evaluation board is a fully-assembled and tested surface-mount regulator that provides a ± ...

Page 2

... The input source for the LM2675-5.0 evaluation board must be greater than 8V for proper startup and operation. The maximum input voltage is 40V, including transients. During startup, the LM2675 may be left unloaded load is connected, the peak current drawn from the source may be as great as 2.2A (for a full 1A load). A source with a lower current limit will slow down the startup of the regulator ...

Related keywords

lm2675
LM2675-5.0EVAL datasheet
LM2675-5.0EVAL data sheet
LM2675-5.0EVAL pdf datasheet
LM2675-5.0EVAL component
LM2675-5.0EVAL part
LM2675-5.0EVAL distributor
LM2675-5.0EVAL RoHS
LM2675-5.0EVAL datasheet download