Linear Technology DC1504A Quick setup guide

1
dc1504af
DEMO MANUAL DC1504A
DESCRIPTION
LT4180
Virtual Remote Sense Controller
Demonstration circuit 1504A features the LT4180, a virtual
remote sense controller which eliminates the need for
remote sense wires to compensate for IR losses in cables
and wires, and is used in conjunction with the LT3693
buck converter. The circuit is designed for an input voltage
range of 8V to 36V with an output of 5V at 3A. The circuit
board has a total wire resistance of 0.4Ω and a voltage
drop of 1.2V. The circuit contains five selectable jumpers.
JP1 turns the converter ON or Off, JP2-JP4 allow for easy
selection of other dither frequency combinations, and 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
JP5 enables or disables spread spectrum operation. The
LT4180 data sheet gives a complete description of the part,
its operation and application information. The data sheet
must be read in conjunction with this quick start guide for
working on or modifying the demo circuit 1504A.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA= 25°C)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range 836V
VOUT Output Voltage Accuracy VIN = 8V to 36V, ILOAD = 3A 4.8V 5 5.2V V
Ripple VIN = 12V, ILOAD = 3A 50 mV
fSBuck Switching Frequency 500 KHz
QUICK START PROCEDURE
Demonstration circuit 1504A is easy to set up to evalu-
ate the performance of the LT4180. Refer to Figure 2 for
proper equipment setup and follow the procedure below.
When input or output voltage ripple is measured, care
must be taken to avoid a long ground lead on the oscil-
loscope probe. Measure the input or output voltage ripple
by touching the probe tip directly across the VIN or VOUT
and GND terminals. See Figure 2 for proper scope probe
technique.
1. Place jumpers in the following position:
JP1 On
JP2 Low
JP3 High
JP4 High
JP5 Low

2
dc1504af
DEMO MANUAL DC1504A
Figure 1. Output Voltage vs Load
2. With power off, connect the input power supply to VIN
and GND.
Apply 8V to input.
Check for the proper output voltage.
QUICK START PROCEDURE
4.95
4.97
4.99
5.01
5.03
5.05
5.07
5.09
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3
Vout vs Load
12Vin
Load (A)
Vout (V)
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
Once the proper output voltage is established, adjust the
input voltage and load within the operating range and
observe the output voltage regulation, ripple voltage, ef-
ficiency and other parameters.

3
dc1504af
DEMO MANUAL DC1504A
Figure 2. Proper Equipment Setup
Figure 3. Proper Input/Output Ripple Measurement Technique
QUICK START PROCEDURE
V
OUT
GND
+
–
POWER
SOURCE

4
dc1504af
DEMO MANUAL DC1504A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components for DC1504A
1 2 C7, C8 CAP, 7343 470μF 20% 10V TANT AVX TPSE477M010R0050
2 1 C10 CAP, 1206 0.47μF 10% 50V X7R TDK C3216X7R1H474K
3 1 C13 CAP, 22μF 50V ALUM SUN ELECT. 50CE22BS
4 1 C14 CAP, 1206 4.7μF 10% 50V X7R MURATA GRM31CR71H475K
5 2 C15, C16 CAP, 1206 47μF 20% 10V X5R TAIYO YUDEN LMK316BJ476ML
6 1 C21 CAP, 1206 0.1μF 10% 50V X7R AVX 12065C104KAT2A
7 2 C22, C23 CAP, 1206 1μF 20% 50V X7R TDK C3216X7R1H105M
8 1 C24 CAP, 1206 4.7nF 5% 100V C0G MURATA GRM3195C2A472JA01D
9 2 C25, C27 CAP, 1206 470pF 5% 100V NP0 AVX 12061A471JAT2A
10 2 C26, C28 CAP, 1206 0.047μF 5% 50V X7R AVX 12065C473JAT
11 1 C29 CAP, 1206 330pF 5% 100V NP0 AVX 12061A331JAT2A
12 1 C30 CAP, 1206 47pF 10% 50V NP0 AVX 12065A470KAT
15 1 D1 DIODE, SCHOTTKY BARRIER RECTIFIER ON SEMI MBRA340T3G
16 1 D2 DIODE, SCHOTTKY SOD323 CENTRAL SEMI. CMDSH-3 TR
20 1 L1 IND, 6.8H SUMIDA CDRH8D43-6R8NC
22 1 R6 RES, 1206 10kΩ 1% 1/4W NIC NRC12F1002TRF
23 1 R7 RES, 1206 68.1kΩ 1% 1/4W NIC NRC12F6812TRF
24 1 R9 RES, 1206 30.1kΩ 1% 1/4W NIC NRC12F3012TRF
26 1 R15 RES, 1206 21.5kΩ 1% 1/4W NIC NRC12F2152TRF
27 1 R19 RES, 1206 1.87kΩ 1% 1/4W NIC NRC12F1871TRF
28 1 R20 RES, 1206 2.15kΩ 1% 1/4W NIC NRC12F2151TRF
29 1 R21 RES, 1206 5.36kΩ 1% 1/4W NIC NRC12F5361TRF
30 1 R23 RES, 1206 22.1kΩ 1% 1/4W NIC NRC12F2212TRF
31 1 R24 RES, 1206 23.2kΩ 1% 1/4W VISHAY CRCW120623K2FKEA
32 1 R25 RES, 1206 0.033 Ω 1% 1/4W VISHAY WSL1206R0330FEA
36 1 R34 RES, 1206 1kΩ 5% 1/4W VISHAY CRCW12061K00JNEA
37 1 U1 IC, STEP-DOWN SWITCHING REGULATOR LINEAR TECH. LT3693EDD
38 1 U2 IC, LINEAR TECH. LT4180EGN
Additional Circuit Components for Demo Board Only
25 5 R14, R16, R17, R18, R22 RES, 1206 100kΩ 5% 1/4W VISHAY CRCW1206100KJNEA
34 4 R27, R28, R29, R30 RES, 4527 0.1Ω 5% 2W VISHAY WSR2R1000JEA
33 1 R26 RES, 1206 0Ω JUMPER NIC NRC12ZO
Optional Components
13 0 C31 OPTION CAP, 470μF 35V ALUM OPTION SUN ELECT. 35ME470AX
14 0 C33, C34, C35, C36 CAP, 1206 OPTION OPTION
17 0 D3 DIODE, SCHOTTKY SOD323 OPTION CENTRAL SEMI. CMDSH-3 OPTION
21 0 Q1 XSTR, 2N7002 N-CHANNEL MOSFET DIODES/ZETEX 2N7002 OPTION
35 0 R32, R33, R35 RES, 1206 OPTION OPTION
39 0 U3 IC, DUAL SCHMITT-TRIGGER INVERTER OPTION TI SN74LVC2G14DBVT OPTION
Hardware for Demo Board Only
18 5 E1, E2, E3, E5, E6 TURRET MILL-MAX 2501-2-00-80-00-00-07-0
19 5 JP1, JP2, JP3, JP4, JP5 HEADER, 3-PIN 2mm SAMTEC TMM-103-02-L-S
40 5 JP1, JP2, JP3, JP4, JP5 SHUNT SAMTEC 2SN-BK-G

5
dc1504af
DEMO MANUAL DC1504A
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

6
dc1504af
DEMO MANUAL DC1504A
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0711 • 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