DC1207A - Demo Manual

DEMO MANUAL DC1207A
LT3504
Quad 40V/1A Step-Down
Switching Regulator with
100% Duty Cycle Operation
DESCRIPTION
The demo circuit 1207A is a quad current mode PWM stepdown DC/DC converter featuring the LT®3504. The demo
circuit is designed for 5V, 3.3V, 2.5V and 1.8V outputs
from a 5.4V to 40V input. The current capability of each
channel is up to 1A. Individual soft-start and current limit
for each output as well as synchronous function simplify
the complex design of quad-output power converters.
Each converter is synchronized to either a common external clock input or a resistor programmable 250kHz to
2.2MHz internal oscillator. Programmable frequency allows
optimization between efficiency and external component
PERFORMANCE SUMMARY
size. Each output can be independently disabled using its
own RUN/SS pin.
The LT3504 data sheet gives a complete description of
the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide for the demo circuit 1207A.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VIN
Input Supply Range
5.4
VOUT1
Output Voltage 1
VOUT2
UNITS
40
V
4.75
5
5.15
V
Output Voltage 2
3.135
3.3
3.40
V
VOUT3
Output Voltage 3
2.375
2.5
2.575
V
VOUT4
Output Voltage 4
1.71
1.8
1.854
V
Frequency
Switching Frequency
0.9
1
1.1
IOUT1
VOUT1 Maximum Output Current
VIN = 5.4 ~ 40V
1
A
IOUT2
VOUT2 Maximum Output Current
VIN = 5.4 ~ 40V
1
A
IOUT3
VOUT3 Maximum Output Current
VIN = 5.4 ~ 40V
1
A
IOUT4
VOUT4 Maximum Output Current
VIN = 5.4 ~ 40V
1
A
VOUT1(AC)
VOUT1 Output Ripple
VIN = 5.4 ~ 40V, IOUT1 = 1A, BW = 20MHz
20
mV
VOUT2(AC)
VOUT2 Output Ripple
VIN = 5.4 ~ 40V, IOUT2 = 1A, BW = 20MHz
20
mV
VOUT3(AC)
VOUT3 Output Ripple
VIN = 5.4 ~ 40V, IOUT3 = 1A, BW = 20MHz
20
mV
VOUT4(AC)
VOUT4 Output Ripple
VIN = 5.4 ~ 40V, IOUT4 = 1A, BW = 20MHz
20
mV
MHz
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DEMO MANUAL DC1207A
DESCRIPTION
100
95
EFFICIENCY (%)
90
85
80
75
70
65
60
5
10
15
25
20
VIN (V)
30
35
40
Figure 1. System Efficiency at f = 1MHz with All Channels
Sourcing 1A Current
Figure 2. Thermal Image at VIN = 12V, f = 1MHz with All
Channels Sourcing 1A Current
QUICK START PROCEDURE
The demo circuit 1207A is easy to set up to evaluate the
performance of the LT3504. Refer to Figure 3 for proper
measurement equipment setup and follow the procedure
below:
3. Turn on the power at the input.
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the VIN or
VOUT and GND terminals. See Figure 4 for proper scope
probe technique.
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
NOTE: Make sure that the input voltage does not exceed 40V.
4. Check for the proper output voltages.
5. Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters
1. Place JP1-JP5 on ON position.
2. With power off, connect the input power supply to VIN
and GND.
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DEMO MANUAL DC1207A
QUICK START PROCEDURE
Figure 3. DC1207A Proper Equipment Setup
VIN
GND
Figure 4. Measuring Input or Output Ripple
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DEMO MANUAL DC1207A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
2
C1, C2
CAP, 0805 10μF 10% 6.3V X5R
AVX 08056D106KAT2A
2
2
C3, C4
CAP, 1206 22μF 10% 6.3V X5R
AVX 12066D226KAT2A
3
1
C5
CAP, 0603 2.2μF 10% 6.3V X5R
TAIYO YUDEN JMK107BJ225KAT
4
4
C6, C19, C26, C27
CAP, 0603 1μF 10% 50V X5R
TDK C1608X5R1H105K
5
4
C7, C16, C17, C18
CAP, 0603 47nF 10% 10V X7R
AVX 0603ZC473KAT2A
6
1
C21
CAP, 0402 22pF 5% 16V NPO
AVX 0402YA220JAT2A
7
1
C22
CAP, 0402 43pF 5% 25V NPO
AVX 04023A430JAT
8
1
C23
CAP, 0402 82pF 5% 50V NPO
AVX 04025A820JAT
9
1
C24
CAP, 0402 100pF 10% 16V X7R
AVX 0402YC101KAT
10
4
D1-D4
DIODE, SCHOTTKY BARRIER RECTIFIER
ON SEMI MBRM140T3G
11
2
L1, L2
IND, 8.2μH
SUMIDA CDRH5D28-8R2
12
2
L3, L4
IND, 4.2μH
SUMIDA CDRH5D28-4R2
13
1
L5
IND, 10μH
TAIYO YUDEN CBC2016100M
14
1
R1
RES, 0402 53.6k 1% 1/16W
VISHAY CRCW040253K6FKED
15
1
R2
RES, 0402 31.6k 1% 1/16W
VISHAY CRCW040231K6FKED
16
1
R3
RES, 0402 21.5k 1% 1/16W
VISHAY CRCW040221K5FKEA
17
1
R4
RES, 0402 12.7k 1% 1/16W
VISHAY CRCW040212K7FKED
18
1
R5
RES, 0402 18.2k 1% 1/16W
VISHAY CRCW040218K2FKED
19
1
R6
RES, 0402 200k 5% 1/16W
VISHAY CRCW0402200KJNED
20
1
R7
RES, 0402 475k 1% 1/16W
VISHAY CRCW0402475KFKED
21
1
R8
RES, 0402 100k 1% 1/16W
NIC NRC06F1003TRF
22
4
R9-R12
RES, 0402 10.2k 1% 1/16W
VISHAY CRCW040210K2FKED
23
1
U1
IC, 40V QUAD BUCK REGULATOR
LINEAR TECH. LT3504EUFD
Additional Demo Board Circuit Components
1
1
C8
CAP, 22μF 20% 50V ALUM
SANYO 50CE22BS
2
0
C9
CAP, OPTION
OPTION
3
0
C10
CAP, 0603 OPTION
OPTION
4
0
C11
CAP, 1206 OPTION
OPTION
5
4
C12-C15
CAP, 0603 0.1μF 10% 50V X7R
MURATA GRM188R71H104KA93D
6
0
FB1
FERRITE BEAD OPTION
OPTION
7
0
L6
IND, OPTION
OPTION
Hardware—For Demo Board Only
1
16
E1-E16
TURRET
MILL MAX 2501-2-00-80-00-00-07-0
2
5
JP1-JP5
HEADER, 3-PIN, 2mm
SAMTEC TMM-103-02-L-S
3
5
JP1-JP5
SHUNT, 2mm
SAMTEC 2SN-BK-G
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DEMO MANUAL DC1207A
SCHEMATIC DIAGRAM
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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DEMO MANUAL DC1207A
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
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Linear Technology Corporation
LT 0712 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
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