DC2297A - Demo Manual

DEMO MANUAL DC2297A
LT8570, LT8570-1
Boost/SEPIC/Inverting Regulator
DESCRIPTION
Demonstration circuits 2297A-A and 2297A-B feature the
LT®8570 and LT8570-1 in a boost configuration. These
demo circuits demonstrate small size and low component
count. Both converters are designed to convert a 5V to
10V source to 12V. Refer to Figures 3 and 4 for maximum
load current at different input voltage levels.
Both converters use only one feedback resistor to set the
output voltage.
The LT8570 can operate with inputs as high as 40V but
in these demo circuits, the input is limited by the voltage
rating of the input capacitors, and the magnitude of the
output voltage.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
The LT8570 and LT8570-1 include many other features
such as synchronization to external clock, user configurable
undervoltage lockout, soft-start, frequency foldback, and
other features that are easily configured as Boost, SEPIC
or Inverting Converters.
The data sheet gives a complete description of the device,
operation and application information. The data sheet must
be read in conjunction with this demo manual for DC2297A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2297A
L, LT, LTC, LTM, µModule, 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
CONDITIONS
MIN
VIN = 5V, ILOAD = 125mA
11.64
TYP
MAX
UNITS
10
V
12
12.36
V
DC2297A-A
VIN
Input Supply Range
VOUT
Output Voltage
5
RIPPLE
VIN = 5V, ILOAD = 125mA
EFFICIENCY
VIN = 5V, ILOAD = 125mA
25
SWITCHING FREQUENCY
mV
86
%
1.5
MHz
DC2297A-B
VIN
Input Supply Range
VOUT
Output Voltage
5
VIN = 5V, ILOAD = 60mA
11.64
12
10
V
12.36
V
RIPPLE
VIN = 5V, ILOAD = 60mA
5
mV
EFFICIENCY
VIN = 5V, ILOAD = 60mA
86
%
1.5
MHz
SWITCHING FREQUENCY
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1
DEMO MANUAL DC2297A
QUICK START PROCEDURE
Demo circuit 2297A is easy to set up to evaluate the performance of the LT8570 and LT8570-1. Refer to Figure 1
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 Figure 2 for proper scope
probe technique.
1. With power off, connect the input power supply to VIN
and GND.
–
POWER
SUPPLY
–
+
IIN
2. Turn on the power at the input.
NOTE: Make sure that the input voltage does not
exceed 10V.
3. Check for the proper output voltage.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
4. 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.
+
–
+
–
–
VIN
+
LOAD
VOUT
+
+
–
IOUT
Figure 1. Proper Measurement Equipment Setup
GND
VIN
Figure 2. Measuring Input or Output Ripple
2
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DEMO MANUAL DC2297A
QUICK START PROCEDURE
450
90
400
85
350
80
EFFICIENCY (%)
LOAD (mA)
300
250
200
150
75
70
65
60
100
55
50
0
3
4
5
6
7
INPUT (V)
8
9
50
10
0
20
40
80
60
INPUT (V)
100
DC2297A F03
Figure 3. DC2297A-A Max Load Current vs Input Voltage
Figure 5. DC2297A-A Efficiency at 5VIN
90
220
85
200
180
80
EFFICIENCY (%)
160
LOAD (mA)
140
DC2297A F05
240
140
120
100
80
75
70
65
60
60
40
55
20
0
120
3
4
5
6
7
INPUT (V)
8
9
10
DC2297A F04
Figure 4. DC2297A-B Max Load Current vs Input Voltage
50
0
10
20
30
40
INPUT (V)
50
60
DC2297A F06
Figure 6. DC2297A-B Efficiency at 5VIN
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3
DEMO MANUAL DC2297A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2297A-A
Required Circuit Components for Boost Regulator
1
1
C1
CAP., CER., 4.7µF, X7R, 16V, 10%, 0805
MURATA, GRM21BR71C475KA73L
2
1
C2
CAP., CER., 0.1µF, X7R, 16V, 10%, 0402
MURATA, GRM155R71C104KA88D
3
1
C3
CAP., CER., 2.2nF, X7R, 16V, 10%, 0402
AVX, 0402YC222KAT2A
4
1
C4
CAP., CER., 47pF, C0G, 25V, 5%, 0402
AVX, 04023A470JAT2A
5
1
C6
CAP., CER., 4.7µF, X7R, 16V, 10%, 0805
MURATA, GRM21BR71C475KA73L
6
1
D1
DIODE, SCHOTTKY, 30V, 1A, DI123
DIODES INC., DFLS130-7
7
1
L1
IND., 33µH
WÜRTH ELEKTRONIK, 744 042 330
8
1
R2
RES., 11.3k, 1/8W, 1%, 0805
VISHAY, CRCW080511K3FKEA
9
1
R3
RES., 10k, 1/8W, 1%, 0805
VISHAY, CRCW080510K0FKEA
10
1
R5
RES., 56.2k, 1/10W, 1%, 0603
VISHAY, CRCW060356K2FKEA
11
1
R6
RES., 6.04k, 1/10W, 1%, 0603
NIC, NRC06F6041TRF
12
1
R7
RES., 130k, 1/10W, 1%, 0603
VISHAY, CRCW0603130KFKEA
13
1
U1
I.C., LT8570EDD, 8DFN
LINEAR TECH., LT8570EDD#PBF
Additional Demo Board Circuit Components
1
1
C5
CAP., CER., 0.1µF, X7R, 16V, 10%, 0603
TDK, C1608X7R1C104K
2
1
R4
RES., 100k, 1/8W, 1%, 0805
VISHAY, CRCW0805100KFKEA
TEST POINT, TURRET, 0.094" MTG HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
Hardware: For Demo Board Only
1
6
E1–E6
DC2297A-B
Required Circuit Components for Boost Regulator
1
1
C1
CAP., CER., 4.7µF, X7R, 16V, 10%, 0805
MURATA, GRM21BR71C475KA73L
2
1
C2
CAP., CER., 0.1µF, X7R, 16V, 10%, 0402
MURATA, GRM155R71C104KA88D
3
1
C3
CAP., CER., 2.2nF, X7R, 16V, 10%, 0402
AVX, 0402YC222KAT2A
4
1
C4
CAP., CER., 47pF, C0G, 25V, 5%, 0402
AVX, 04023A470JAT2A
5
1
C6
CAP., CER., 2.2µF, X7R, 16V, 10%, 0805
MURATA, GRM21BR71C225KA12L
6
1
D1
DIODE, SCHOTTKY, 30V, 1A, DI123
DIODES INC., DFLS130-7
7
1
L1
IND., 68µH
U ELEKTRONIK, 744 042 680
8
1
R2
RES., 11.3k, 1/8W, 1%, 0805
VISHAY, CRCW080511K3FKEA
9
1
R3
RES., 10k, 1/8W, 1%, 0805
VISHAY, CRCW080510K0FKEA
10
1
R5
RES., 56.2k, 1/10W, 1%, 0603
VISHAY, CRCW060356K2FKEA
11
1
R6
RES., 6.04k, 1/10W, 1%, 0603
NIC, NRC06F6041TRF
12
1
R7
RES., 130k, 1/10W, 1%, 0603
VISHAY, CRCW0603130KFKEA
13
1
U1
I.C., LT8570EDD-1, 8DFN
LINEAR TECH., LT8570EDD-1#PBF
Additional Demo Board Circuit Components
1
1
C5
CAP., CER., 0.1µF, X7R, 16V, 10%, 0603
TDK, C1608X7R1C104K
2
1
R4
RES., 100k, 1/8W, 1%, 0805
VISHAY, CRCW0805100KFKEA
TEST POINT, TURRET, 0.094" MTG HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
Hardware: For Demo Board Only
1
4
6
E–E6
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DEMO MANUAL DC2297A
SCHEMATIC DIAGRAM
VIN
5V TO 10V
E1
3
4
VIN
SW
SHDN
FB
VC
SYNC
SYNC 8
E6
R4
100k
0805
SS
7
RT
6
C2
0.1µF
GND
9
R6
56.2k
0603
VOUT*
R7
130k
0603
U1*
R3
10k
0805
SYNC
GND
5
SHDN
E2
E4
C1
4.7µF
16V
0805
R2
11.3k
0805
SHDN
D1
DFLS130
L1*
1
C6*
16V
0805
2
R6
6.19k
0603
C5
0.1µF
16V
0603
C4
47pF
C3
2.2nF
E3
E5
GND
* VERSION TABLE
ASSEMBLY TYPE
C6
L1
VOUT
DC2297A-A
LT8570EDD
U1
4.7µF
33µF
12V/125mA
DC2297A-B
LT8570-1EDD
2.2µF
66µH
12V/60mA
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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.
5
DEMO MANUAL DC2297A
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
6
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Linear Technology Corporation
LT 0315 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
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