DC1793A - Demo Manual

DEMO MANUAL DC1793A
LTC3260EMSE
High Voltage, Low Noise, Dual Supply
Inverting Charge Pump
DESCRIPTION
Demonstration circuit 1793A is a high voltage inverting
charge pump with low noise dual-polarity LDO regulators featuring the LTC®3260EMSE. The LTC3260 operates
with an input voltage from 4.5V to 32V. The demo board
provides selectable LDO± output set magnitudes of
3.3V, 5V, 12V and 24V for each polarity. Additional LDO±
set point jumper selections and optional topside ADJ±
resistors allow the user to set other desired LDO± output
voltages. The demo board also 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 LTC3260 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 1793A.
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
4.5
32
V
VLDO+
LDO+ Output Voltage
VIN ≥ LDO+ Set Point + 0.8V
1.2
32
V
VLDO–
LDO– Output Voltage
VOUT ≤ LDO– Set Point – 0.5V
–32
–1.2
V
VOUT
Output Voltage
MODE = 0V
MODE ≥ 2V
MIN
TYP
MAX
–VIN
–0.94 • VIN
UNITS
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.
JP2: EN– is in the ON position.
JP3: MODE is in the BURST position.
JP4: FREQ is in the 500kHz position.
JP5: LDO+ is set to the 5V setting.
JP6: LDO– is set to the –5V setting.
2. Set PS1 to 12V.
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DEMO MANUAL DC1793A
QUICK START PROCEDURE
3. Slowly increase the load on LDO– to –50mA and
observe how the output ripple on VOUT changes and
how the burst frequency increases. When the load
is large enough, the charge pump will run constant
frequency to keep VOUT in regulation.
4. Slowly increase the load on LDO+ to 50mA and observe
the output ripple and the output voltage on LDO+.
5. Set the LDO+ load and the LDO– load to 0mA and
turn off PS1.
NOTE: To avoid applying an overvoltage to the ADJ±
pins, power must be turned off before changing the
LDO+ or LDO– jumpers.
12. Turn on and set PS1 to 32V.
13. Repeat steps 3 through 6.
14. Turn on and set PS1 to 12V.
15. Slowly increase the load on VOUT to –100mA and
observe the output ripple and output voltage on VOUT.
16. Set the load on VOUT to 0mA.
17. Change the JP3 MODE jumper from Burst Mode operation to constant-frequency mode and repeat steps
14 and 15.
6. Set the JP5 LDO+ jumper to the 3.3V position and JP6
LDO– to the –3.3V position.
18. Change the JP4 FREQ jumper from 500kHz to 200kHz,
then slowly increase the load on VOUT from 0mA to
–50mA and observe the output ripple and output voltage on VOUT.
7. Repeat steps 2 through 5.
19. Set the load on VOUT to 0mA.
8. Set the JP5 LDO+ jumper to the 12V position and JP6
LDO– to the –12V position.
20. Change the JP4 FREQ jumper from 200kHz to
50kHz. Slowly increase the load on VOUT from 0mA
to –10mA and observe the output ripple and output
voltage on VOUT.
9. Turn on and set PS1 to 15V.
10. Repeat steps 3 through 5.
11. Set the JP5 LDO+ jumper to the 24V position and JP6
LDO– to the –24V position.
0-50mA
Figures 4 and 5 illustrate how the efficiency varies with
load current in Burst Mode operation and in constantfrequency mode operation.
0-50mA
Figure 1. Proper Measurement Equipment Setup for DC1793A
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DEMO MANUAL DC1793A
QUICK START PROCEDURE
VLDO+
10mV/DIV
AC-COUPLED
VLDO–
10mV/DIV
AC-COUPLED
GND
VIN
dc1793a F02
VOUT
10mV/DIV
AC-COUPLED
Figure 2. Measuring Input or Output Ripple
dc1793a F03
1μs/DIV
fOSC = 500kHz
VIN = 15V
VLDO+ = 12V ILDO+ = 50mA
– = –12V
VLDO
ILDO– –50mA
Figure 3. LDO Rejection of VOUT Ripple
80
VIN = 12V, CONSTANT FREQUENCY
+LDO DISABLED
–LDO = –5V, 0A
75
70
50kHz CF MODE
65
60
EFFICIENCY (%)
55
200kHz CF MODE
50
45
500kHz CF MODE
40
35
30
25
20
15
10
1
10
–IVOUT (mA)
100
dc1793a F04
Figure 4. VIN to VOUT Constant-Frequency Mode Operation Efficiency
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3
DEMO MANUAL DC1793A
QUICK START PROCEDURE
80
VIN = 12V, Burst Mode OPERATION
+LDO DISABLED
–LDO = –5V, 0A
fOSC = 500kHz
EFFICIENCY (%)
75
70
65
1
10
100
– IVOUT (mA)
dc1793a F05
Figure 5. VIN to VOUT Burst Mode Operation Efficiency
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
4
C2, C3, C6, C10
CAP, CER, 10μF, 50V, X7S, 10%, 1210
TDK, C3225X7S1H106K
2
1
C4
CAP, CER, 1μF, 50V, X7R, 10%, 1206
MURATA, GRM31MR71H105KA88
3
2
R11, R18
RES, 100k, 1/16W, 1%, 0402, SMD
VISHAY, CRCW0402100KFKED
4
1
U1
LOW NOISE DUAL-SUPPLY INVERTING CHARGE PUMP
LINEAR TECHNOLOGY, LTC3260EMSE#PBF
Additional Demo Board Circuit Components
5
1
C1
CAP, CER, 4.7μF, 50V, X7R, 10%, 1210
MURATA, GRM32ER71H475KA88L
6
0
C5, C7, C9 (OPT)
CAP, CER, 0603, 50V
OPT
7
2
C8, C11
CAP, CER, 0.01μF, 25V, X7R, 10%, 0402
MURATA, GRM155R71E103KA01D
8
3
R1, R8, R10
RES, 1MΩ, 1/16W, 5%, 0402, SMD
VISHAY, CRCW04021M00JNED
9
2
R2, R13
RES, 1.91MΩ, 1/16W, 1%, 0402, SMD
VISHAY, CRCW04021M91FKED
10
2
R3, R14
RES, 909k, 1/16W, 1%, 0402, SMD
VISHAY, CRCW0402909KFKED
11
2
R5, R16
RES, 174k, 1/16W, 1%, 0402, SMD
VISHAY, CRCW0402174KFKED
12
0
R6, R17 (OPT)
RES, 0402, SMD
OPT
13
3
R7, R9, R12
RES, 1k, 1/16W, 5%, 0402, SMD
VISHAY, CRCW04021K00FKED
14
1
R19
RES, 1MΩ, 1/16W, 1%, 0402, SMD
VISHAY, CRCW04021M00FKED
15
1
R20
RES, 200k, 1/16W, 1%, 0402, SMD
VISHAY, CRCW0402200KFKED
Hardware: For Demo Board Only
17
3
JP1-JP3
HEADER, 3 PIN, 1 ROW, 0.079"
SAMTEC, TMM-103-02-L-S
18
1
JP4
HEADER, 4 PIN, 1 ROW, 0.079"
SAMTEC, TMM-104-02-L-S
19
2
JP5, JP6
HEADER, 2×5 PINS, 2mm
SAMTEC, TMM-105-02-L-D
20
6
JP1-JP6
SHUNT, 2mm
SAMTEC, 2SN-KB-G
21
8
E1, E2, E7-E12
TP, TURRET, 0.094", PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
22
4
E3-E6
TURRET, 0.061", DIA
MILL-MAX, 2308-2-00-80-00-00-07-0
dc1793afa
4
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.
E6
E5
E4
E3
E2
JP1
EN+
1K
R12
1K
R9
1K
R7
OFF
ON
C1
4.7uF
50V
1210
1
2
3
R1
1.0M
5%
ON
OFF
JP2
EN -
C5
OPT
50V
0603
1
2
3
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE 0402, 1%, 1/16W
ALL CAPACITORS ARE 0402, 10%
NOTE: UNLESS OTHERWISE SPECIFIED
GND
MODE
EN -
EN+
GND
4.5V - 32V
VIN
VIN
CONT
FREQ JP3
MODE
C7
OPT
50V
0603
BURST
R8
1.0M
5%
VIN
1
2
3
C9
OPT
50V
0603
1
2
3
4
C4
1uF
50V
1206
R20
200K
R19
1.0M
2
9
8
14
13
1
7
10
11
RT
NC
NC
MODE
EN-
EN+
C-
C+
VIN
17
GND
3
4
5
16
15
12
6
C11
0.01uF
25V
C8
0.01uF
25V
JP5
LDO+
R2
1.91M
C3
10uF
50V
1210
R11
100K
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
R6
OPT
R13
1.91M
R5
174K
R18
100K
SCALE = NONE
NC
MARTY M.
PCB DES.
APP ENG.
APPROVALS
JP6
LDO-
R4
316K
VOUT
R3
909K
CUSTOMER NOTICE
BYP-
ADJ-
LDO -
BYP+
ADJ+
LDO +
VOUT
Figure 6. LTC3260EMSE Low Noise Dual Supply Inverting Charge Pump
JP4
FREQ
50KHz
200KHz
500KHz
R10
1.0M
5%
VIN
C2
10uF
50V
1210
VIN
U1
LTC3260EMSE
24V
12V
5V
3.3V
OPT
E1
-24V
-12V
-5V
-3.3V
OPT
R15
316K
R17
OPT
DATE
E12
E11
E10
E9
E8
E7
GND
LDO 50mA
GND
LDO +
50mA
GND
VOUT
( - VIN )
100mA
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C10
10uF
50V
1210
APPROVED
M. MERCHANT 03 - 12 - 12
DATE:
N/A
SIZE
LTC3260EMSE
DEMO CIRCUIT 1793A
03 - 12 - 12
IC NO.
SHEET 1
OF
1
2
REV.
LOW NOISE DUAL SUPPLY INVERTING CHARGE PUMP
TECHNOLOGY
R16
174K
C6
10uF
50V
1210
DESCRIPTION
PRODUCTION FAB
2
REVISION HISTORY
REV
TITLE: SCHEMATIC
R14
909K
ECO
DEMO MANUAL DC1793A
SCHEMATIC DIAGRAM
dc1793afa
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DEMO MANUAL DC1793A
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
dc1793afa
6
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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