DC1144A - Demo Manual

DEMO MANUAL DC1144A
LT3580EDD Boost/
Inverting Regulator
DESCRIPTION
Demonstration circuits 1144A-A and 1144A-B feature the
LT®3580EDD in Boost/Inverting Regulator configurations.
The demo circuits demonstrate small size and low component count. The boost is designed to convert a 3V to
10V source to 12V at 300mA while the inverter converts
a 5V to 12V source to –12V at 350mA. Both converters
use only one feedback resistor to set the output voltage.
linear regulator built into the board that will allow the IC
to be powered from a lower voltage. If this option is used,
just cut the trace as shown in Figure 6 and install the optional emitter follower regulator on the back of the board.
The LT3580 operates with inputs as high as 32V but in
these demo boards the input is limited by the voltage
rating of the input capacitors and the magnitude of the
boost output. In a boost converter the input needs to be
less than the output.
The LT3580 includes many other features such as Synchronization to external clock, User Configurable Undervoltage
Lockout, Soft-start, Frequency Foldback, and it is easily
configured as boost or inverting converter.
Care must be taken when operating the LT3580 at high
input voltages as the junction temperature increases due
to higher internal dissipation. Higher switching frequencies
also increase the internal dissipation.
The LT3580 gets powered from the main input in both,
DC1144A-A and DC1144A-B, but there is an option for a
PERFORMANCE SUMMARY
The DC1144A-B can easily be configured into a SEPIC
converter, just switch the positions of L2 and D2 as shown
in Figure 6.
These circuits are intended for space-conscious applications such as Local Bias Supplies, TFT-LCD Bias Supplies,
GPS Receivers, VFD Bias Supplies and DSL Modems.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1144A
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
Performance Summary DC11144A-A
SYMBOL
PARAMETER
VIN
Input Supply Range
VOUT
Output Voltage Range
CONDITIONS
MIN
VIN = 3V, ILOAD = 300mA
11.64
TYP
MAX
10
V
12
12.36
V
3
UNITS
Ripple
VIN = 3.6V, ILOAD = 300mA
40
Efficiency
VIN = 4.2V, ILOAD = 350mA
88
%
1
MHz
Switching Frequency
mV
Performance Summary DC11144A-B
SYMBOL
PARAMETER
VIN
Input Supply Range
VOUT
Output Voltage Range
CONDITIONS
MIN
TYP
5
VIN = 5V, ILOAD = 350mA
–11.64
–12
MAX
UNITS
12
V
–12.36
V
Ripple
VIN = 5V, ILOAD = 350mA
10
mV
Efficiency
VIN = 5V, ILOAD = 350mA
80
%
2
MHz
Switching Frequency
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DEMO MANUAL DC1144A
QUICK START PROCEDURE
Demonstration circuit 1144A is easy to set up to evaluate the
performance of the LT3580EDD. Refer to Error! Reference
source not found. and Figure 2 for proper measurement
equipment setup and follow the procedure below:
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 Error! Reference source
not found. for proper scope probe technique.
1. Place jumpers in the following positions:
JP1 ON
2. With power off, connect the input power supply to VIN
and GND.
3. Turn on the power at the input.
4. 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.
5. 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.
Figure 1. Proper Measurement Equipment for DC1144A-A
2
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DEMO MANUAL DC1144A
QUICK START PROCEDURE
Figure 2. Proper Measurement Equipment for DC1144A-B
GND
VIN
Figure 3. Measurement Input and Output Ripple
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DEMO MANUAL DC1144A
QUICK START PROCEDURE
90
80
70
70
EFFICIENCY (%)
EFFICIENCY (%)
80
60
50
50
40
40
30
60
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
1144A F04
Figure 4. Boost Converter Efficiency at 4.2VIN
30
0
40
60 120 160 200 240 300 340 400
OUTPUT CURRENT (mA)
1144A F05
Figure 5. Inverting Regulator Efficiency at 5VIN
Figure 6. Optional Modifications to Convert DC1144A-B to ZEPIC Converter and/or Use Separate Regulator to Bias IC
4
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DEMO MANUAL DC1144A
PARTS LIST
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components for Boost Converter
1
C2
CAP., X5R, 4.7μF, 16V, 20% 1206
TAIYOYUDEN, EMK316BJ475ML
1
C4
CAP., X5R, 10μF, 25V, 20% 1206
TAIYOYUDEN, TMK316ABJ106ML-T
1
C7
CAP., X7R, 1000pF, 16V, 10% 0402
MURATA, GRM155R71C102KA01D
1
D1
DIODE, SCHOTTKY RECTIFIER 2A, POWER D123
DIODES INC., DFLS220L-7
1
L1
INDUCTOR, 6.8μH
SUMIDA, CDRH5D16NP-6R8NC
1
R2
RES., CHIP, 130k, 1/6W, 1% 0402
VISHAY, CRCW0402133KFKED
1
R5
RES., CHIP, 20k, 1/16W, 1% 0402
VISHAY, CRCW040220K0FKED
1
R6
RES., CHIP, 84.5k, 1/6W, 1% 0402
VISHAY, CRCW040284K5FKED
1
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1144A-A
1
C6
CAP., X7R, 0.1μF, 16V, 10% 0402
AVX, 0402YC104KAT2A
1
U1
LT3580EDD, 8-LEAD PLASTIC DFN (3X3)
LINEAR TECH., LT3580EDD#PBF
Additional Demo Board Circuit Components
0
C3 (OPT)
CAP., 0402
1
C5
CAP., X7R, 0.1μF, 16V, 10% 0603
0
C8 (OPT)
CAP., 0402
0
D3 (OPT)
AVX, 0603YC104KAT2A
6
TP1-TP6
TESTPOINT, TURRET
MILL MAX 2501-2-00-80-00-00-07-0
1
JP1
0.079 SINGLE ROW HEADER, 3 PIN
SAMTEC, TMM103-02-L-S
1
XJP
SHUNT
SAMTEC, 2SN-BK-G
0
Q2 (OPT)
2
R4, R8
RES., CHIP, 100k, 1/10W, 1% 0805
VISHAY, CRCW0805100KFKEA
0
R9 (OPT)
Required Circuit Components for Inverting Regulator
1
C1
CAP., X5R,1μF, 25V,10%, 0805
AVX, 08053D105KAT
1
C2
CAP., X5R, 4.7μF, 16V, 20% 1206
TAIYOYUDEN, EMK316BJ475ML
1
C4
CAP., X5R, 10μF, 25V, 20% 1206
TAIYOYUDEN, TMK316ABJ106ML-T
1
C6
CAP., X5R, 0.1μF, 16V, 10% 0402
AVX, 0402YC104KAT2A
1
C7
CAP., X7R, 2200pF, 16V, 10% 0402
MURATA, GRM155R71C222KA01D
1
C8
CAP., NPO, 100pF, 25, 10%, 0402
AVX, 04023A101KAT2A
1
D2
DIODE, SCHOTTKY RECTIFIER 2A, POWER D123
DIODES INC., DFLS130L-7
1
L1
INDUCTOR, 8.2μH
COOPER BUSSMANN, SD25-8R2-R
1
L2
INDUCTOR, 15μH
COOPER BUSSMANN, SD14-150-R
1
R2
RES., CHIP, 143k, 1/6W, 1% 0402
VISHAY, CRCW0402143KFKED
1
R5
RES., CHIP, 20k, 1/16W, 1% 0402
VISHAY, CRCW040220K0FKED
1
R6
RES., CHIP, 42.2k, 1/6W, 1% 0402
VISHAY, CRCW040242K2FKED
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT 1144A-B
LT3580EDD, 8-LEAD PLASTIC DFN (3X3)
LINEAR TECH., LT3580EDD#PBF
1
1
U1
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DEMO MANUAL DC1144A
PARTS LIST
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
6
0
C3 (OPT)
CAP., 0402
1
C5
CAP., X7R, 0.1μF, 16V, 10% 0603
AVX, 0603YC104KAT2A
0
D3 (OPT)
6
TP1-TP6
TESTPOINT, TURRET
MILL MAX 2501-2-00-80-00-00-07-0
1
JP1
0.079 SINGLE ROW HEADER, 3 PIN
SAMTEC, TMM103-02-L-S
1
XJP
SHUNT
SAMTEC, 2SN-BK-G
0
Q2 (OPT)
2
R4, R8
RES., CHIP, 100k, 1/10W, 1% 0805
VISHAY, CRCW0805100KFKEA
0
R9 (OPT)
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1
2
GND
TP6
TP3
OFF
ON
TP1
1
R4
100K
JP1
shdn
SHDN
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.
B
1uF, 25V
DFLS130L
NOT USED
[email protected]
5V to 12V
C1
DC1144A-B
D2
2
1
NOT USED
D1
*
VC
FB
NOT USED
R8
100K
C6
0.1uF
R6
LT3580EDD
U1
2
DFLS220L
VOUT
sync
5
*
C1
*
[email protected]
TP4
Q2
OPT
1
C2
4.7uF
16V
1206
1
D1
3V to 10V
VIN
SYNC
D3
OPT
R9
OPT
L1
DC1144A-A
ASSEMBLY TYPE
*
3
2
Output
VERSION TABLE
SHDN
VIN *
3
2
*
1
2
VIN
VIN
4
SW
3
SYNC
8
SS
7
RT
6
GND
9
B
1nF
C7
*
2.2nF
*
C7
R5
20K
*
D2
L2
OPT
L1
C4
10uF
25V
1206
100pF
A
SD25-8R2
NOT USED CDRH5D16-6R8
C8
C8
*
*
R2
C3
A
L2
TP5
C5
0.1uF
16V
0603
TP2
SD14-150
NOT USED
VOUT
143K
130K
R2
GND
VOUT *
42.2K
84.5K
R6
1
2
DEMO MANUAL DC1144A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1144A
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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dc1144af
Linear Technology Corporation
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●
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