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dc1721bf

DEMO MANUAL 
DC1721B-A/DC1721B-B

Linear Technology  Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417 

(408) 432-1900 

 FAX: (408) 434-0507 

 

www.linear.com

© 

LINEAR TECHNOLOGY CORPORATION 2013

LT 0313 • 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 applica-
tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Copyright © 2004, Linear Technology Corporation

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Summary of Contents for DC1721B-A

Page 1: ...portableapplicationsincludinginstruments industrial equipment power tools and computers It has a total footprint area of 12 4cm2 3 6cm2 for the LTC4000 circuit only Synchronous rectification helps to attain efficiency exceeding 96 at full load and nominal input DC1721B A The LTC4000 has an input current limit regulation loop that prevents overloading sources with limited output capability DC1721B ...

Page 2: ...s no output temporarily disconnect the load to make sure that the load is not set too high 8 OncetheproperVOUT SYSisagainestablished adjust the load and or source within the operating range and observe the output voltage regulation ripple voltage efficiency input and output current limit and other desired parameters 9 Turn off the power at the input 10 Connect the output load and meters to the BAT...

Page 3: ...EMO MANUAL DC1721B A DC1721B B QUICK START PROCEDURE Figure 1 Proper Measurement Equipment Setup Figure 2 Proper Noise Measurement Setup Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com ...

Page 4: ... LTC4000 Gm Gm Gm Gm LTC3789 NOT ON THE BOARD GND GND RC1 RC1 CC1 CC1 VOUT SYS VOUT SYS BAT BAT VIN VIN 10nF 10nF CC2 CC2 Figure 3 Efficiency from VIN to VOUT SYS DC1721A LTC4000 and LTC3789 Efficiency IOUT A 0 5 EFFICIENCY 100 95 85 90 80 2 5 4 5 1 5 3 5 5 5 VIN 36V VIN 24V VIN 6V VIN 15V Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com ...

Page 5: ...A10 A8 A9 Rsense charge DC DC CONVERTER ITH LTC4000 1 Gm Gm Gm Gm LTC3789 NOT ON THE BOARD GND GND RC1 RC1 CC1 CC1 VOUT SYS VOUT SYS BAT BAT VIN VIN 10nF 10nF CC2 CC2 QUICK START PROCEDURE Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com ...

Page 6: ...KY 40V 2A SMA DIODES ZETEX B240A 13 F 21 1 D9 DIODE ZENER 3V 500MW SOD 323 DIODES ZETEX BZT52C3V0S 7 F 22 1 F1 FUSE 6 3A 32V T LAG 1206 SMD COOPER BUSSMAN 3216TD6 3 R 23 1 L1 INDUCTOR 4 7μH TOKO FDA1254 4R7M 24 2 Q2 Q4 MOSFET N Chan 40V POWERPAK 8 VISHAY SiR422DP T1 GE3 25 2 Q3 Q5 MOSFET N Chan 20V POWERPAK 8 VISHAY SiR496DP T1 GE3 26 2 Q6 Q7 MOSFET P Chan 30V POWERPAK 8 VISHAY Si7135DP T1 GE3 27 ...

Page 7: ...al Demo Board Circuit Components 57 0 C3 C23 C26 C27 OPT 1210 58 1 C33 CAP X5R 4 7μF 10V 20 0603 AVX 0603ZD475MAT2A 59 1 CBAT CAP X5R 2 2μF 25V 20 0805 AVX 08053D225MAT2A 60 0 CF1 CC1 R6 C7 C8 C11 R12 R22 R27 R30 R38 R43 R53 R61 R62 CNTC CF CCX OPT 0603 OPT 61 2 CIIMON CIBMON CAP C0G 1000pF 25V 5 0603 AVX 06033A102JAT2A 62 0 CIN3 CIN4 OPT 63 0 D11 OPT SOD323 OPT 64 1 LED2 LED DUAL RED GREEN LiteOn...

Page 8: ...C3V0S 7 F 21 1 D10 DIODE ZENER 5 6V 500MW SOD 123 DIODES ZETEX BZT52C5V6 7 F 22 1 F1 FUSE 6 3A 32V T LAG 1206 SMD COOPER BUSSMAN 3216TD6 3 R 23 1 L1 INDUCTOR 4 7μH TOKO FDA1254 4R7M 24 2 Q2 Q4 MOSFET N Chan 40V POWERPAK 8 VISHAY SiR422DP T1 GE3 25 2 Q3 Q5 MOSFET N Chan 20V POWERPAK 8 VISHAY SiR496DP T1 GE3 26 2 Q6 Q7 MOSFET P Chan 30V POWERPAK 8 VISHAY Si7135DP T1 GE3 27 2 Q8 Q9 MOSFET SMALL SIGNA...

Page 9: ... DC1721B B Additional Demo Board Circuit Components 58 0 C3 C23 C26 C27 OPT 1210 59 1 C33 CAP X5R 4 7μF 10V 20 0603 AVX 0603ZD475MAT2A 60 1 CBAT CAP X5R 2 2μF 25V 20 0805 AVX 08053D225MAT2A 61 0 CF1 CC1 R6 C7 C8 C11 R12 R22 R27 R30 R38 R43 R53 R61 R62 CNTC CF CCX OPT 0603 OPT 62 2 CIIMON CIBMON CAP C0G 1000pF 25V 5 0603 AVX 06033A102JAT2A 63 0 CIN3 CIN4 OPT 64 0 D11 OPT SOD323 OPT 65 1 LED2 LED DU...

Page 10: ...HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION 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 ...

Page 11: ...ONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION 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 TECHNOL...

Page 12: ...E 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 electrostati...

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