Linear Technology DC2120A Manuel utilisateur

dc2120af

DEMO MANUAL DC2120A

Description

LT3048-15

Low Noise Bias Generator

Demonstration circuit 2120A features the LT3048-15, a

Boost DC/DC Converter with integrated Schottky diode and

LDO in a 2mm ×2mm DFN package. This demo board is

designed to convert a 2.7V to 4.8V input to a 15V output

at 19mA to 35mA with low output ripple and noise. The

LT3048-15 is programmed for 2MHz switching frequency.

This demonstration board can be used to evaluate other

fixed output voltage versions of the LT3048.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

performance summary

The LT3048 data sheet gives a complete description of

the part, operation, and application information. The data

sheet must be read in conjunction with this Quick Start

Guide for the demo circuit DC2120A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2120A

Specifications are at TA= 25°C

Figure 1. DC2120A Efficiency

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Supply Range 2.7 4.8 V

Output Voltage Range VIN = 2.7V, IOUT = 19mA 14.625 15 15.375 V

Switching Frequency 1.7 2.2 2.7 MHz

Output Ripple VIN = 4.8V, Load = 37mA 1 mV

OUTPUT CURRENT (mA)

EFFICIENCY (%)

10 10 186 14 26

dc2120a F01

3822 30 34

2.7VIN

4.8VIN

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dc2120af

DEMO MANUAL DC2120A

Quick start proceDure

Demonstration circuit 2120A is easy to set up to evalu-

ate the performance of the LT3048. Refer to Figure 2 for

proper measurement equipment setup and follow the

procedure below:

NOTE. When measuring the output voltage ripple, connect

a X1 oscilloscope probe as shown in Figure 3.

1. Place jumper in the following positions: JP1 Run

2. With power off, connect the input power supply to VIN

and GND.

3. Turn on the power at the input.

NOTE. Make sure that the input voltage does not

exceed 4.8V.

4. Connect a 20mA load from VOUT to GND and check for

the proper output voltage. VOUT = 14.625V to 15.375V

If there is no output, temporarily disconnect the load

to make sure that the load is not set too high.

5. Once the proper output voltages are established, adjust

the input voltage and load within the operating range

and observe the output voltage regulation, ripple volt-

age, efficiency and other parameters.

Figure 2. Proper Measurement Equipment Setup

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dc2120af

DEMO MANUAL DC2120A

Quick start proceDure

Figure 3. Output Ripple Measurement Technique

Figure 4. Output Voltage Ripple

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dc2120af

DEMO MANUAL DC2120A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., X7R, 4.7µF, 25V, 10%, 0805 TDK, C2012X7R1E475K

2 1 C2 CAP., X7R, 2.2µF, 25V, 10%, 0805 TDK, C2012X7R1E225K

3 1 C4 CAP., X7R, 1µF, 25V, 10%, 0603 TDK, C1608X7R1E105K

4 1 C3 CAP., C0G, 1nF, 25V, 5%, 0603 MURATA GRM1885C1E102JA01D

5 1 L1 INDUCTOR, 10µH COOPER Bussmann, SD3110-100-R

6 1 U1 IC., LT3048EDC-15#PBF, DFN-2X2, 8 LEAD LINEAR TECH., LT3048EDC-15#PBF

7 1 FAB, PRINTED CIRCUIT BOARD DEMO BOARD 2120A

Additional Demo Board Circuit Components

1 1 C5 CAP., X7R, 1µF, 25V, 10%, 0603 TDK, C1608X7R1E105K

Hardware: For Demo Board Only

1 4 E1-E4 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 3 PIN 0.079" SINGLE ROW HEADER SULLINS, NRPN031PAEN-RC

3 1 XJP1 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

4 1 STENCIL STENCIL DC2120A

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dc2120af

DEMO MANUAL DC2120A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

schematic Diagram

D D

C C

B B

A A

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

COPPER

BUSSMANN

SD3110-100-R

Vin (V) Iout (mA)

2.7

3.3

3.6

4.8 37

1uF

25V

1uF

25V

2.2uF

25V

0805

2.2uF

25V

0805 E2

VOUT

15V

VOUT

15V

1uF

25V

1uF

25V

1nF

JP1

RUN ON

OFF

JP1

RUN ON

OFF

E4 GND

10uH

LT3048EDC-15

SW 1

BYP 4

BSTOUT 8

VIN

GND

LDOIN 6

LDOOUT 5

GND

VIN

2.7V - 4.8V E1

VIN

2.7V - 4.8V

4.7uF

25V

0805

4.7uF

25V

0805

GND

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dc2120af

DEMO MANUAL DC2120A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0314 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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