LM2733YEVAL National Semiconductor, LM2733YEVAL Datasheet

LM2733YEVAL

Manufacturer Part Number

LM2733YEVAL

Description

BOARD EVALUATION LM2733Y

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LM2733XMFNOPB.pdf (14 pages)

2.LM2731XEVAL.pdf (3 pages)

Specifications of LM2733YEVAL

Main Purpose

DC/DC, Step Up

Outputs And Type

1, Non-Isolated

Current - Output

Voltage - Input

2.7 ~ 14V

Regulator Topology

Boost

Frequency - Switching

600kHz

Board Type

Fully Populated

Utilized Ic / Part

LM2733

Lead Free Status / RoHS Status

Not applicable / Not applicable

Voltage - Output

Power - Output

Current page: 1 of 3
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LM2731/LM2733 Evaluation

Board

The LM2731 and LM2733 are high frequency switching

boost regulators which offer small size and high power con-

version efficiency. The "X" version of the part operates at

1.6MHz switching frequency and the "Y" version at 600kHz.

The primary difference between the LM2731 and LM2733 is

that the LM2731 has a higher current internal switch FET

(with lower breakdown voltage), while the LM2733 has a

higher voltage FET which handles less current. The LM2733

targets applications with higher output voltages, while the

Component Values

The initial build of evaluation boards were built up in 12V and

24V output versions using different components at selected

locations (see Note 1 below). The components which are

common to all boards are:

1. PCB

2. R1, resistor 51k, 5%

3. R3, resistor 13.3k, 1%

4. C1,

5. D1, diode, MBR0530

6. L1, inductor:10 µH (Sumida # CR43-100)

# EMK316BJ225ML

capacitor,

2.2

µF,

ceramic,

AN200691

Eval Board Basic Applicatrion Circuit

Eval Board Component Layout

Taiyo-Yuden

National Semiconductor

Application Note 1280

April 2003

LM2731 is intended for applications requiring higher load

currents at lower output voltages. This application note will

describe the evaluation board supplied to demonstrate the

operation of these parts and give information on its usage.

Basic Application Circuit

The basic application circuit shown below provides the com-

ponent designators used on the evaluation board.

The components which are application specific are:

1. C2, output capacitor: a 4.7 µF cap is installed on the

2. R2, resistor which sets output voltage. See section on

3. C3, feed forward capacitor. Dependent on R2, see sec-

Note 1: (addendum 02/06/03) An additional build of eval boards for 3.3V to

5V applications using the LM2731 were made on this date. See Demo Board

section for details.

board for LM2733 (X and Y) and the LM2731X devices.

A 10 µF output capacitor is used for the LM2731Y de-

vices.

adjusting the output voltage for details.

tion on feedforward compensation.

20069102

20069101

www.national.com

Related parts for LM2733YEVAL

LM2733YEVAL Summary of contents

Page 1

... EMK316BJ225ML 5. D1, diode, MBR0530 6. L1, inductor:10 µH (Sumida # CR43-100) © 2003 National Semiconductor Corporation National Semiconductor Application Note 1280 April 2003 LM2731 is intended for applications requiring higher load currents at lower output voltages. This application note will describe the evaluation board supplied to demonstrate the operation of these parts and give information on its usage ...

Page 2

Adjusting the Output Voltage The output voltage is set using R2 and R3 as given by the formula 1.23 (R2/R3) + 1.23 OUT Solved for R2 1.23 OUT The evaluation ...

Page 3

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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