DC1661A - Demo Manual

DEMO MANUAL DC1661A
LT3579/LT3579-1:
Boost/Inverting DC/DC
Converter
DESCRIPTION
Demonstration circuit 1661A features the LT®3579 and
LT3579-1 in a parallel boost regulator configuration. The
circuit is designed to convert a 5V to 10V input source to
12V at 3.5A. DC1661A is designed to survive output short
circuit events with an external disconnect MOSFET at the
output as default. The circuit board includes an option to
install the disconnect MOSFET at the input side. To use it,
install Q1 and R2 on the back of the board, place a jumper
from Q2 source to drain and cut top copper as shown in
Figure 3. The circuit board can also be used to supply two
separate output voltages. Cut trace as shown in Figure 3
remove R13 and R14, and set feedback and VC components as needed. The LT3579 includes a 42V master and
slave switch combination with 6A total current and can be
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
VIN
Input Supply Range
VOUT
Output Voltage Accuracy
used in many configurations such as boost, SEPIC, cuk
and flyback. It has a 2.5V to 16V operating input range,
UVLO, soft-start, programmable switching frequency
and many other popular features. The LT3579 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 1661A.
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.
(TA = 25°C)
CONDITIONS
MIN
VIN = 5V to 10V, ILOAD = 3.5A
11.60
TYP
MAX
10
V
12
12.30
V
5
UNITS
Efficiency
VIN = 5V, ILOAD = 3.5A
83
%
Efficiency
VIN = 10V, ILOAD = 3.5A
92
%
Ripple
VIN = 5V, ILOAD = 3.5A
50
mV
1
MHz
FS
Switching Frequency
dc1661af
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DEMO MANUAL DC1661A
QUICK START PROCEDURE
Demonstration circuit 1661A is easy to set up to evaluate
the performance of the LT3579/LT3579-1. Refer to Figure 1
and Figure 2 for proper measurement equipment set-up
and follow the procedure below:
To measure 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 2 for proper scope probe technique.
Apply 7.5V to input (source must have >12A capability).
Check for the proper output voltages.
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
load within the operating range and observe the output
voltage regulation, ripple voltage, efficiency and other
parameters.
1. Place jumper in the following position:
JP1 On
2. With power off, connect the input power supply to VIN
and GND.
dc1661a F01
Figure 1. DC1661A Proper Equipment Set-Up
dc1661af
2
DEMO MANUAL DC1661A
QUICK START PROCEDURE
VOUT GND
dc1661 F02
Figure 2. Proper Input/Output Ripple Measurement Technique
CUT COPPER HERE TO USE
DISCONNECT MOSFET AT
INPUT SIDE
CUT COPPER HERE FOR TWO
OUTPUT OPTION
VOUT1
R14
R13
VOUT2
dc1661a F03
Figure 3. Using Demo Board Options
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3
DEMO MANUAL DC1661A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components For DC1424A-A
1
5
C1, C2, C5, C11,
C15
CAP, X5R, 4.7µF, 16V, 20% 1206
AVX, 1206YD475MAT2A
2
4
C3, C4, C9, C10
CAP, X5R, 22µF, 25V, 10% 1210
AVX, 12103D226KAT2A
3
1
C6
CAP, NPO, 100pF, 25V, 10% 0402
AVX, 04023A101KAT2A
4
2
C7, C12
CAP, X5R, 0.1µF, 25V, 10% 0402
AVX, 04023D104KAT2A
5
1
C8
CAP, X7R, 4700pF, 25V, 10% 0402
AVX, 04023C472KAT2A
6
2
D1, D2
DIODE, SCHOTTKY, POWERMITE
DIODES, MBRM560-13-F
7
2
L1, L2
INDUCTOR, 2.2µH 8A POWER
VISHAY, IHLP2525CZER2R2M01
8
1
Q2,
MOSFET, P-CH 20V 25A 1212-8
VISHAY, Si7141DP-T1-GE3
9
1
R1
RES, CHIP, 22.1k, 1%, 0805
VISHAY, CRCW080522K1FKEA
10
2
R3, R8
RES, CHIP, 100k, 1%, 0402
VISHAY, CRCW0402100KFKED
11
1
R4
RES, CHIP, 64.9k, 1%, 0805
VISHAY, CRCW080564K9FKEA
12
1
R5
RES, CHIP, 10k, 1%, 0402
VISHAY, CRCW040210K0FKED
13
1
R6
RES, CHIP, 10k, 1%, 0805
VISHAY, CRCW080510K0FKEA
14
2
R7, R9
RES, CHIP, 86.6k, 1%, 0402
VISHAY, CRCW040286K6FKED
15
1
R12
RES, CHIP, 6.34k, 1%, 0402
VISHAY, CRCW04026K34FKED
16
1
U1
IC, LT3579EFE-1, 20 pin TSSOP-4.4mm
LINEAR TECHNOLOGY, LT3579EFE-1#PBF
17
1
U2
IC, LT3579EFE, 20 pin TSSOP-4.4mm
LINEAR TECHNOLOGY, LT3579EFE#PBF
18
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1661A
Additional Demo Board Circuit Components
1
2
R13, R14
RES, CHIP, 0Ω, 0402
VISHAY, CRCW04020000Z0ED
Hardware For Demo Board Only
1
4
E1 to E4
TESTPOINT, TURRET, 0.91”
MILL-MAX, 2501-2-00-80-00-00-07-0
2
2
J1, J2
BANANA JACK
KEYSTONE, 575-4
3
1
JP1
HEADER, 0.079 SINGLE ROW 3 PIN
SAMTEC, TMM-103-02-L-S
4
1
XJP
SHUNT, MTGS AT 4
SAMTEC, 2SN-BK-G
5
4
CORNERS
STAND-OFF, NYLON 0.5” TALL
KEYSTONE, 8833(SNAP ON)
dc1661af
4
1
2
VIN
OFF
JP1
CLKOUT
ON
E4
J2
J1
3
2
R1
22.1K
0805
C1
4.7uF
16V
1206
R17
OPT
0805
VIN2
R6
10K
0805
R2
OPT
4
C11
4.7uF
16V
1206
C15
4.7uF
16V
1206
R3
100K
GATE
VIN
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.
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN 0402.
ALL CAPACITORS ARE IN 0402.
B
3
4
U1
C7
0.1uF
R7
86.6K
LT3579EFE-1
VC
FB
2
1
R13
0
D2
MBRM560
2
CUSTOMER NOTICE
R9
86.6K
LT3579EFE
U2
VC
FB
1
D1
MBRM560
C8
4.7nF
R5
10K
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A.K.
SCALE = NONE
JESUS R.
C10
22uF
25V
1210
C4
22uF
25V
1210
__
ECO
DATE:
N/A
SIZE
VIN
D3
OPT
GATE
R12
6.34K
6.3K
1
2
3
5
6
7
8
E2
C5
4.7uF
16V
1206
E1
JESUS R.
DATE
VOUT
12-06-10
GND
12V, 3.5A
APPROVED
DEMO CIRCUIT 1661A
LT3579EFE-1, LT3579EFE
A
Monday, December 06, 2010
IC NO.
SHEET 1
3
REV.
OF 1
TWO BOOST REGULATORS IN PARALLEL
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Q2
Si7141DP
PRODUCTION
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
C9
22uF
25V
1210
3
REV
4
A
TITLE: SCHEMATIC
C13
OPT
APPROVALS
C14
OPT
R16
10K
OPT
C6
100pF
C3
22uF
25V
1210
R15 OPT
R14
0
R4
64.9K
0805
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
C12
0.1uF
CLKOUT
SHDN
GATE
FAULT
L2
VIN2
IHLP-2525CZER2R2M01
CLKOUT
SHDN
GATE
FAULT
C2
4.7uF
16V
1206 VIN
L1
IHLP-2525CZER2R2M01
CLKOUT
16
17
FAULT
R8
100K
16
17
3
4
FAULT
CLKOUT
VIN
NOTE: UNLESS OTHERWISE SPECIFIED
E3
OUTPUT
1
SYNC
GND
5V-10V
5
6
7
8
5
VIN
5
20
1
2
3
SS
19
SS
19
VIN
SYNC
10
9
8
7
6
SW1
SW1
SW1
SW1
SW1
RT
18
VIN
10
9
8
7
6
SW1
SW1
SW1
SW1
SW1
RT
18
VIN2
21
Q1
OPT
21
SYNC
20
11
12
13
14
15
SW2
SW2
SW2
SW2
SW2
GND
11
12
13
14
15
SW2
SW2
SW2
SW2
SW2
GND
B
1
2
DEMO MANUAL DC1661A
SCHEMATIC DIAGRAM
dc1661af
5
DEMO MANUAL DC1661A
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
dc1661af
6
Linear Technology Corporation
LT 0211 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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