DC1882A - Demo Manual

DEMO MANUAL DC1882A
LTC3261EMSE
High Voltage, Low Noise
Inverting Charge Pump
DESCRIPTION
Demonstration circuit 1882A is a high voltage inverting charge pump featuring the LTC®3261EMSE. The
LTC3261 operates with an input voltage from 4.5V to 32V.
The demo board provides the means to select between
Burst Mode® operation or constant-frequency mode
operation, plus select an operating frequency of 500kHz,
200kHz, and 50kHz.
The LTC3261 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 demo circuit 1882A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
VIN
Input Voltage
VOUT
Output Voltage
MIN
TYP
MAX
4.5
MODE = 0V
MODE ≥ 2V
32
–VIN
–0.94 • VIN
UNITS
V
V
V
QUICK START PROCEDURE
Refer to Figure 1 for the proper measurement equipment
setup and jumper settings, 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. Make sure the jumper settings are as follows:
JP1: EN is in the ON position.
2. Set PS1 to 15V and turn on supply.
3. Slowly increase the load from 0mA to –100mA and
observe the output voltage and output ripple.
4. Set the load to 0mA.
5. Move the MODE jumper, JP2, from the BURST position
to the CONT FREQ position and then repeat step 3.
6. Set the load to 0mA.
7. Move the FREQ jumper, JP3, from the 500kHz position
to the 200kHz position.
JP2: MODE is in the BURST position.
8. Slowly increase the load from 0mA to –50mA and
observe the output voltage and output ripple.
JP3: FREQ is in the 500kHz position.
9. Set the load to 0mA.
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DEMO MANUAL DC1882A
QUICK START PROCEDURE
10. Move the FREQ jumper, JP3, from the 200kHz position
to the 50kHz position.
11. Slowly increase the load from 0mA to –10mA and
observe the output voltage and output ripple.
12. Turn off the load and PS1.
13. Set up the load, AM2 and VM2, for the power conversion efficiency measurement, as illustrated in
Figure 3.
14. Set the MODE jumper, JP2, to the BURST position and
the FREQ jumper, JP3, to the 500kHz position.
15. Set PS1 to 15V and turn on the supply.
16. Set the load to a desired current from 0mA to 100mA.
17. Calculate the power conversion efficiency from the
following formula:
Efficiency =
V L • IL
VS • IS
• 100%
Figures 4 and 5 illustrate how the power conversion
efficiency varies with load current in Burst Mode operation
and in constant-frequency mode operation.
dc1882a F01
Figure 1. Proper Measurement Equipment Setup for DC1882A
dc1882a F02
Figure 2. Measuring Input or Output Ripple
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DEMO MANUAL DC1882A
QUICK START PROCEDURE
dc1882a F03
Figure 3. Power Conversion Efficiency Measurement Setup
90
VIN = 15V
80
50kHz CF MODE
70
200kHz CF MODE
EFFICIENCY (%)
60
500kHz CF MODE
50
40
30
20
10
1
10
IL (mA)
100
dc1882a F04
Figure 4. LTC3261 Constant-Frequency Mode Operation Power Conversion Efficiency
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3
DEMO MANUAL DC1882A
QUICK START PROCEDURE
90
VIN = 15V
fOSC = 500kHz
89
88
EFFICIENCY (%)
87
86
85
84
83
82
81
80
10
1
100
IL (mA)
dc1882a F05
Figure 5. LTC3261 Burst Mode Operation Power Conversion Efficiency
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC1826A Required Circuit Components
1
2
C2, C4
CAP, CER, 10μF, 50V, X7S, 10%, 1210
TDK, C3225X7S1H106K
2
1
C3
CAP, CER, 1μF, 50V, X7R, 10%, 1206
MURATA, GRM31MR71H105KA88
5
1
U1
LOW NOISE INVERTING CHARGE PUMP
LINEAR TECHNOLOGY, LTC3261EMSE#PBF
CAP, CER, 4.7μF, 50V, X7R, 10%, 1210
MURATA, GRM32ER71H475KA88L
Additional Demo Board Circuit Components
1
1
C1
3
2
R1, R2
RES, 1MΩ, 1/16W, 5%, 0402, SMD
VISHAY, CRCW04021M00JNED
4
2
R3
RES, 1MΩ, 1/16W, 1%, 0402, SMD
VISHAY, CRCW04021M00FKED
5
1
R4
RES, 200k, 1/10W, 1%, 0402, SMD
VISHAY, CRCW0402200KFKED
SAMTEC, TMM-103-02-L-S
Hardware: For Demo Board Only
1
3
JP1-JP2
HEADER, 3 PIN, 1 ROW, 0.079"
2
1
JP3
HEADER, 4 PIN, 1 ROW, 0.079"
SAMTEC, TMM-104-02-L-S
3
3
JP1-JP3
SHUNT, 2mm
SAMTEC, 2SN-KB-G
4
4
E1, E2, E6, E7
TP, TURRET, 0.094", PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
5
3
E3, E4, E5
TURRET, 0.061", DIA
MILL-MAX, 2308-2-00-80-00-00-07-0
dc1882afa
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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.
E5
E4
E3
E2
OFF
ON
1K
5%
R6
1K
5%
R5
JP1
EN
C1
4.7uF
50V
1210
1
2
3
R1
1M
5%
CONT
FREQ
JP2
2
3
MODE
1
BURST
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE 0402, 1%, 1/16W
NOTE: UNLESS OTHERWISE SPECIFIED
GND
MODE
EN
GND
4.5V - 32V
VIN
E1
11
10
LTC3261EMSE
MODE
EN
C+
CUSTOMER NOTICE
C6
OPT
0603
C5
OPT
0603
C2
10uF
50V
1210
VIN
8
13
2
12
7
6
3
1
4
PCB DES.
NC
SCALE = NONE
DATE:
N/A
SIZE
JP3
FREQ
500KHz
200KHz
50KHz
TECHNOLOGY
1
2
3
4
VOUT
GND
( - VIN )
100mA
03-12-12
IC NO.
LTC3261EMSE
DEMO CIRCUIT 1882A
SHEET 1
OF
1
1
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E7
E6
LOW NOISE INVERTING CHARGE PUMP
TITLE: SCHEMATIC
R4
200K
R3
1.0M
C4
10uF
50V
1210
Figure 10. LTC3261 Low Noise Inverting Charge Pump
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
RT
NC
NC
NC
NC
NC
VOUT
APPROVALS
C-
5
APP ENG. MARTY M.
GND
50V
1206
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
5%
R2
1M
9
U1
C3
1uF
DEMO MANUAL DC1882A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1882A
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
dc1882afa
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Linear Technology Corporation
LT 0114 REV A • 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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