DC2105A - Demo Manual

DEMO MANUAL DC2105A
LTC3630AEMSE/LTC3630EMSE
High Efficiency High Voltage 500mA
Synchronous Step-Down Converter
Description
Demonstration circuit 2105A is a 500mA output DC/DC
power supply. There are two versions: DC2105A-A is a
board featuring LTC®3630A, with 4V to 76V input range;
DC2105A-B is a board featuring LTC3630, with 4V to 65V
input range. The LTC3630A/LTC3630 operates in a high
efficiency Burst Mode® operation and includes internal
high and low side switches. The board provides jumper
selected output voltages of 1.8V, 3.3V, 5V and an option
for additional voltages. LTC3630A/LTC3630 has internal
soft-start and a provision for increasing soft-start time.
Output voltage between 800mV and VIN can be programmed using optional resistors, although higher voltage
output capacitors will be required.
Included on the board is an ON/OFF jumper that can also
be configured as a precision undervoltage lockout. Additional PC pads are included for programming current
limit to optimize efficiency and for reducing output voltage
Design files for this circuit board are available at
http://www.linear.com/demo/DC2105A
Performance Summary
ripple and reducing component size. A terminal (FBO)
is available to allow multiple boards to be paralleled for
increasing output current.
The LTC3630A/LTC3630 data sheet gives a complete description of the operation and application information.
The data sheet must be read in conjunction with this
demo manual.
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
PARAMETER
CONDITION
VALUE
Input Voltage Range for DC2105A-A
LTC3630A
4V to 76V
Input Voltage Range for DC2105A-B
LTC3630
4V to 65V
1.8V Output
VIN = 20V, VOUT Load = 100mA
1.8V ±2%
3.3V Output
VIN = 20V, VOUT Load = 100mA
3.3 V ±2%
5V Output
VIN = 20V, VOUT Load = 100mA
5V ±2%
Maximum Output Current
VIN = 20V, VOUT = 5V
500mA
Typical Output Voltage Ripple
VIN = 20V, VOUT = 5V
75mVP-P
dc2105af
1
DEMO MANUAL DC2105A
Quick Start Procedure
This DC2105A can be evaluated using the setup shown
in Figure 1.
1.Connect the DVMs to the input and output. Select 5V
setting using jumper JP1 (lower position) and JP2
(upper position), select ON position for JP3.
2.With input power supply set for 0V, connect the supply to VIN and GND terminals using short (less than
10 inches) leads, preferably twisted leads. Connect a
suitable load to VOUT and GND terminals.
3.Slowly increase the input power supply to 10V. Observe
output voltage and verify that it meets the specifications
in the Performance Summary. Measure output voltage
with and without the load.
4.Move jumpers JP1 and JP2 to the other two fixed voltage settings and verify that each output voltage meets
the values as shown in the Performance Summary.
5.Once the proper output voltages are established, adjust
the load and input voltage within the operating range
and observe the output voltage regulation, ripple voltage and other parameters.
NOTES:
1. IMPORTANT: 60V or higher voltage can result in an
electric shock if care is not taken. Also, hot plugging
the circuit to a power supply that has more than 40V
present at its output can produce a high voltage transient exceeding the absolute maximum input voltage
which can damage the LTC3630A/LTC3630.
2. 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 3 for proper
scope probe technique.
NOTE: A 10µF, 100V electrolytic capacitor is necessary when evaluating circuit
with input voltages greater than 40V, using long input wires and hot plugging
circuit into a powered input supply. See Figure 2.
Figure 1. Proper Measurement Equipment Setup
2
dc2105af
DEMO MANUAL DC2105A
Quick Start Procedure
Circuit Options
Detailed information is contained in the data sheet.
Optional Output Voltage: Additional output voltages can
be programmed by selecting proper resistors for the R6
and R7 feedback network. C5 is a feed-forward capacitor
to optimize transient response and increase stability. JP1
and JP2 must be in the lower position if R6 and R7 are
used. The 10V rated output capacitors must be replaced
with suitable voltage ratings.
ISET Components: C3, R3 and R4 are used to provide a
number of features and circuit enhancements such as,
output current limit, input current limit, optimizing output ripple voltage reduction and efficiency improvement.
R4 sets maximum output current, see Figure 2 in the
80
NON-TWISTED LEADS
70
TWISTED LEADS
VIN (V)
60
LTC3630A/LTC3630 data sheet, leave open for maximum
load current. R3 and R4 can be used to set input current
limit. C3 is used to reduce output voltage ripple and optimize efficiency. See data sheet for details.
RUN Pin Components: The converter is enabled when
the RUN pin voltage exceeds 1.21V and is disabled when
dropping below 0.7V. Moving JP3 to the ON position allows an internal current to pull the RUN pin up to 5V. R1
and R2 are used to program input undervoltage lockout.
Select suitable resistors to divide the input voltage down
to the precision threshold voltage levels that enable and
disable the converter. Note that the maximum voltage on
the RUN pin is 6V, therefore a nominal 5V Zener diode
(D1) is required to limit the RUN pin voltage when high
input voltages are used.
TWISTED WITH
10µF ALUMINUM
ELECTROLYTIC
50
40
30
VIN = 50V
20
10
0
DC2105A F02
20µs/DIV
Figure 2. Hot Plugging Input Voltage Transient Using 12" Leads
1.8VOUT
90
EFFICIENCY (%)
EFFICIENCY (%)
90
100
12VIN
36VIN
65VIN
76VIN
80
70
60
50
0.0001
12VIN
36VIN
65VIN
76VIN
100
3.3VOUT
80
70
60
0.001
0.01
0.1
LOAD CURRENT (A)
1
DC2105A F04a
50
0.0001
5VOUT
90
EFFICIENCY (%)
100
Figure 3. Measuring Input or Output Voltage Ripple
80
70
12VIN
36VIN
65VIN
76VIN
60
0.001
0.01
0.1
LOAD CURRENT (A)
1
DC2105A F04b
50
0.0001
0.001
0.01
0.1
LOAD CURRENT (A)
1
DC2105A F04c
Figure 4. Efficiency vs Load Current Curves
dc2105af
3
DEMO MANUAL DC2105A
Parts List
DC2105A-A
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
CAP, 0805 220nF 10% 100V X7R
MURATA GRM21AR72A224KAC5L
2
1
C2
CAP, 2220 4.7µF 20% 100V X7R
TDK C5750X7R2A475M
3
1
C3
CAP, 0603 220pF 10% 50V X7R
AVX 06035C221KAT2A
4
1
C4
CAP, 0603 47nF 10% 25V X7R
AVX 06033C473KAT
5
2
C6, C7
CAP, 1210 100µF 20% 10V X5R
TAIYO YUDEN LMK325ABJ107MM-T
6
1
C9
CAP, 0603 0.1µF 10% 25V X7R
AVX 06033C104KAT2A
7
1
L1
IND, 68µH
SUMIDA CDRH105RNP-680N
8
1
R4
RES, 0603 220kΩ 5% 1/10W
VISHAY CRCW0603220KJNEA
9
1
R5
RES, 0805 4.7Ω 5% 1/8W
VISHAY CRCW08054R70JNEA
10
1
R6
RES, 0603 0Ω JUMPER
VISHAY CRCW06030000Z0EA
11
1
U1
IC, SYNCHRONOUS STEP-DOWN CONVERTER
LINEAR TECH. LTC3630AEMSE
Additional Demo Board Circuit Components
1
0
C5
CAP, 0603 OPTION
OPTION
2
0
C8, C10, C11
CAP, 1210 OPTION
OPTION
3
0
D1
DIODE, OPTION
OPTION
4
0
R1, R2, R3, R7
RES, 0603 OPTION
OPTION
1
6
E1, E2, E3, E4, E5, E6
TURRET
MILL MAX 2501-2-00-80-00-00-07-0
2
3
JP1, JP2, JP3
HEADER, 3 PIN, 2mm
SAMTEC TMM-103-02-L-S
3
3
JP1, JP2, JP3
SHUNT, 2mm
SAMTEC 2SN-BK-G
Hardware
4
dc2105af
DEMO MANUAL DC2105A
Parts List
DC2105A-B
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
CAP, 0805 220nF 10% 100V X7R
MURATA GRM21AR72A224KAC5L
2
1
C2
CAP, 2220 4.7µF 20% 100V X7R
TDK C5750X7R2A475M
3
1
C3
CAP, 0603 220pF 10% 50V X7R
AVX 06035C221KAT2A
4
1
C4
CAP, 0603 47nF 10% 25V X7R
AVX 06033C473KAT
5
2
C6, C7
CAP, 1210 100µF 20% 10V X5R
TAIYO YUDEN LMK325ABJ107MM-T
6
1
C9
CAP, 0603 0.1µF 10% 25V X7R
AVX 06033C104KAT2A
7
1
L1
IND, 68µH
SUMIDA CDRH105RNP-680N
8
1
R4
RES, 0603 220kΩ 5% 1/10W
VISHAY CRCW0603220KJNEA
9
1
R5
RES, 0805 4.7Ω 5% 1/8W
VISHAY CRCW08054R70JNEA
10
1
R6
RES, 0603 0Ω JUMPER
VISHAY CRCW06030000Z0EA
11
1
U1
IC, SYNCHRONOUS STEP-DOWN CONVERTER
LINEAR TECH. LTC3630EMSE
Additional Demo Board Circuit Components
1
0
C5
CAP, 0603 OPTION
OPTION
2
0
C8, C10, C11
CAP, 1210 OPTION
OPTION
3
0
D1
DIODE, OPTION
OPTION
4
0
R1, R2, R3, R7
RES, 0603 OPTION
OPTION
1
6
E1, E2, E3, E4, E5, E6
TURRET
MILL MAX 2501-2-00-80-00-00-07-0
2
3
JP1, JP2, JP3
HEADER, 3 PIN, 2mm
SAMTEC TMM-103-02-L-S
3
3
JP1, JP2, JP3
SHUNT, 2mm
SAMTEC 2SN-BK-G
Hardware
dc2105af
5
A
B
C
E5
E4
R5
4.7
0805
VIN
OPT
D1
C1
220nF
100V
0805
R3
OFF
R2
OPT ON
OPT
R1
OPT
2
JP3
R4
220k
3
1
VIN
C3
220pF
C2
4.7uF
100V
2220
2
A
A
B
A
3.3V
5.0V
EXT. R
5
B
B
1.8V
A
B
JP1
VOUT
JP2
ISET
FBO
RUN
VIN
SS
VPRG2
VPRG1
VFB
SW
10
6
7
9
1
3
2
B A
2
B A
1
1

C4
47nF
3
3
4
3



1
R7
OPT
REV
C5
OPT
2

N/A

C10
OPT
1210
VOUT
C6
100uF
10V
1210
PROD
C8
OPT
1210
APPROVED
E2
CHARLIE Z.
E6
E3
GND
GND
VOUT
C9
1.8V/3.3V/5V
0.1uF 500mA
04/12/13
DATE
1
2
1
 1
LTC3630AEMSE
DEMO CIRCUIT 2105A-A
04/16/13 12:29:21

 1
1

HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS
STEP-DOWN CONVERTER


 


C11
OPT
1210
C7
100uF
10V
1210
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
 
2
JP2
2
JP1
R6
0
VOUT
68uH
SUMIDA CDRH105
L1
ECO


 
MI

 CHARLIE Z.




11
12
5
3
U1
LTC3630AEMSE

1. ALL RESISTORS AND CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
FBO
GND
4V - 76V
VIN
E1
4
GND
8
GND
16
GND
14
GND
6
17
D
5
A
B
C
D
DEMO MANUAL DC2105A
Schematic Diagram
dc2105af
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.
A
B
C
E1
E5
E4
R5
4.7
0805
VIN
OPT
D1
C1
220nF
100V
0805
R3
OFF
R2
OPT ON
OPT
R1
OPT
2
JP3
R4
220k
3
1
C3
220pF
C2
4.7uF
100V
2220
VIN
2
A
A
B
A
3.3V
5.0V
EXT. R
5
B
B
1.8V
A
B
JP1
VOUT
JP2
ISET
FBO
RUN
VIN
SS
VPRG2
VPRG1
VFB
SW
10
6
7
9
1
4
3



11
12
5
3
U1
LTC3630EMSE
3
2
B A
2
B A
1
1

C4
47nF
3
3

1
R7
OPT
REV
C5
OPT
2

N/A

C10
OPT
1210
VOUT
C6
100uF
10V
1210
PROD
C8
OPT
1210
APPROVED
E2
CHARLIE Z.
E6
E3
GND
GND
VOUT
C9
1.8V/3.3V/5V
0.1uF 500mA
04/12/13
DATE
1
2
1
 1
LTC3630EMSE
DEMO CIRCUIT 2105A-B
04/16/13 12:30:01

 1
1

HIGH EFFICIENCY, 65V, 500mA SYNCHRONOUS
STEP-DOWN CONVERTER


 


C11
OPT
1210
C7
100uF
10V
1210
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
 
2
JP2
2
JP1
R6
0
VOUT
68uH
SUMIDA CDRH105
L1
ECO


 
MI

 CHARLIE Z.




1. ALL RESISTORS AND CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
FBO
GND
4V - 65V
VIN
4
GND
8
GND
16
GND
14
GND
17
D
5
A
B
C
D
DEMO MANUAL DC2105A
Schematic Diagram
dc2105af
7
DEMO MANUAL DC2105A
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
8
dc2105af
Linear Technology Corporation
LT 0713 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
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