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dc1821bf

DEMO MANUAL DC1821B

Linear Technology  Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417  

(408) 432-1900 

 

FAX

: (408) 434-0507 

 

www.linear.com

 

LINEAR TECHNOLOGY CORPORATION 2016

LT 0716• PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 LTC 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 LTC 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. 

LTC assumes no liability for applications assistance, 

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

LTC 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 LTC application 

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Copyright © 2004, Linear Technology Corporation

Summary of Contents for DC1821B

Page 1: ... Technology the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation All other trademarks are the property of their respective owners In PWM mode the LTC3114 1 operates at 1 2MHz to optimize small size with high efficiency operation The demo board also incorporates diode D1 to backfeed VCC to improve efficiency in some applications If the demo board output voltage ...

Page 2: ...IN 12V Load Step is from 250mA to 750mA DESCRIPTION dc1821a F02 VOUT 500mV DIV VIN 5V DIV dc1821a F03 VOUT 100mV DIV IOUT 500mA DIV Figure 1 DC1821B Efficiency in Auto Burst Mode Operation DC1821B Typical Efficiency in Auto Burst Mode Operation VIN V 0 EFFICIENCY 100 80 90 70 60 50 10 20 5 15 30 dc1821a F01 40 25 35 250mA LOAD 500mA LOAD 750mA LOAD 1A LOAD ...

Page 3: ...ate current measurements are desired for efficiency calculations for example connectanammeterinserieswiththesupplyasshown The ammeter is not required however 3 Connect a 500mA load to VOUT as shown in Figure 4 10Ω for VOUT 5V Connect an ammeter if accurate current measurement or monitoring is desired 4 Turn on PS1 and slowly increase voltage until the volt age at VIN is 4V 5 Verify VOUT is 5V 6 VI...

Page 4: ...CTOR 6 8μH 30 COILCRAFT MSS1048 682NLB 13 1 R1 RES 2 00M 1 16W 1 0402 SMD VISHAY CRCW04022M00FKED 14 1 R2 RES 499k 1 16W 1 0402 SMD VISHAY CRCW0402499KFKED 15 1 R3 RES SMD 10k 1 1 16W 0402 VISHAY CRCW040210K0FKED 16 1 R4 RES 27 4k 1 16W 1 0402 SMD VISHAY CRCW040227K4FKED 17 1 R5 RES 1 00M 1 16W 1 0402 SMD VISHAY CRCW04021M00FKED 18 1 R8 RES 49 9Ω 1 16W 1 0402 SMD VISHAY CRCW040249R9FKED 19 1 U1 40...

Page 5: ...N AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS SCALE NONE www linear com 1 DEMO CIRCUIT 1821B 1 1 WITH PROGRAMMABLE OUTPUT CURRENT N A LTC3114 1EDHC NC J NOON 11 7 15 40V 1A SYN...

Page 6: ...ORY 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 LTC from all claims arising from the handling or use of...

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