DC1737A - Demo Manual

DEMO MANUAL DC1737A
LTC3863
Low IQ Inverting
DC/DC Converter
DESCRIPTION
Demonstration circuit 1737A is a current-mode inverting
DC/DC converter featuring the LTC®3863.
The board operates from an input range of 4.5V to 16V,
and provides a –5.2V, 1.7A output or a –12V, 1A output
(jumper selectable). It operates at 400kHz and may be
synchronized to an external clock. A soft-start feature
controls output voltage slew rate at start-up, reducing
current surge and voltage overshoot. Burst Mode® operation that improves efficiency at light loads can be enabled
with a jumper. A power good output signal is provided.
The demonstration board has options for larger MOSFET
and diode packages on the back of the board for higher
output current requirements.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
This board is suitable for a wide range of automotive,
telecom, industrial, and other applications. The LTC3863
is available in small 12-pin thermally enhanced MSOP and
DFN Packages. For other output requirements, see the
LTC3863 data sheet or contact the LTC factory.
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.
Specifications are at TA = 25°C
CONDITIONS
MIN
TYP
MAX
4.5
16
UNITS
VIN
Input Supply Range
VOUT
Output Voltage
IOUT
Output Current Range, Continuous
fSW
Switching (Clock) Frequency
VOUT P-P
Output Ripple
VIN = 12V, VOUT = –12V, IOUT = 1A (20MHz BW)
VREG
Output Regulation
Line and Load (4.5VIN to 16VIN, –12VOUT, 0A to 1A Out)
±0.1
%
POUT/PIN
Efficiency (See Figure 3)
VIN = 12V, VOUT = –12V, IOUT = 1A
89.3
%
Approximate Size
Component Area × Top Component Height
–5.2V/–12V
Free Air
0
V
V
–1.7/1.0
A
400
kHz
30
mVP-P
0.9 × 0.8 × 0.18
Inches
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DEMO MANUAL DC1737A
QUICK START PROCEDURE
Demonstration circuit 1737 is easy to set up to evaluate
the performance of the LTC3863. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
b.If efficiency measurements are desired, an ammeter
capable of measuring 2A DC or a resistor shunt can
be put in series with the input supply in order to
measure the DC1737A’s input current.
Note: When measuring the output voltage ripple, care must
be taken to avoid a long ground lead on the oscilloscope
probe. Measure the output voltage ripple by touching the
probe tip and ground ring directly across the last output
capacitor as shown in Figure 1.
c. A voltmeter with a capability of measuring at least
16V can be placed across the input terminals in order
to get an accurate input voltage measurement.
1.Set an input power supply that is capable of 4.5V to
16V to 5V. Then turn off the supply.
2.With power off, connect the supply to the input terminals
+VIN and –VIN.
3.Turn on the power at the input.
Note: Make sure that the input voltage never exceeds 16V.
4.Check for the proper output voltage of –5.2V. Turn off
the power at the input.
a. Input voltages lower than 4.5V can keep the converter
from turning on due to the undervoltage lockout
feature of the LTC3863.
–
+
VIN
+
VIN
A
+
+
–
V VOUT LOAD
V
+
–
–
IIN
–
A
+
IOUT
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1737A
QUICK START PROCEDURE
5.Once the proper output voltage is established, connect
a variable load capable of sinking 1.7A at 5.2V to the
output terminals +VOUT and –VOUT. Set the current
for 0A.
a. If efficiency measurements are desired, an ammeter
or a resistor shunt that is capable of handling 1.7A
DC can be put in series with the output load in order
to measure the DC1737A’s output current.
b.A voltmeter with a capability of measuring at least 12V
can be placed across the output terminals in order
to get an accurate output voltage measurement.
6.Turn on the power at the input.
Note: If there is no output, temporarily disconnect the load
to make sure that the load is not set too high.
7.Once the proper output voltage is again established,
adjust the load and/or input within the operating range
and observe the output voltage regulation, ripple voltage, efficiency and other desired parameters.
8.Remove the VOUT jumper to observe operation at
–12VOUT up to 1A.
90
85
90
VIN = 5V
85
EFFICIENCY (%)
EFFICIENCY (%)
VIN = 5V
80
VIN = 12V
75
70
65
0.01
80
VIN = 12V
75
70
0.1
IOUT (A)
1
65
0.01
0.1
IOUT (A)
1
Figure 2. –12VOUT Efficiency with Burst Mode Operation
at Light Loads
Figure 3. –5.2VOUT Efficiency with Burst Mode Operation
at Light Loads
Figure 4. Output Ripple at 12VIN, –12VOUT and 1A Out
(50mV, 2µs/Div, 20MHz)
Figure 5. Transient Response Waveform at 12VIN, –12VOUT
and 0.5A to 1A to 0.5A Out (0.5A, 100mV, 10µs/Div)
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DEMO MANUAL DC1737A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
CIN1
Cap., SMT, 100µF, 20V, SVP OSCON
SANYO, 20SVP100M
2
2
CIN2, CIN3
CAP.,X7R, 10µF, 25V, 20%, 1210
TDK, C3225X7R1E106M
3
2
COUT1, COUT2
CAP.,X7R, 33µF, 16V, 20%, 1812
TDK, C4532X7R1C336M
4
2
COUT3, COUT5
CAP.,POSCAP, 150µF, 16V 7343
PANASONIC, 16TQC150MYF
5
1
COUT4
CAP.,X7R, 1µF, 16V, 10%, 0603
AVX, 0603YC105KAT2A
6
1
C1
Cap., NPO, 100pF, 50V, 10%, 0603
AVX, 06035A101kAT1A
7
1
C2
Cap., X7R, 27nF 25V, 10%, 0603
AVX, 06033C273KAT
8
1
C3
Cap., NPO, 390pF, 25V, 1%, 0603
AVX, 06033A391FAT2A
9
1
C5
Cap., X7R, 0.47µF, 16V, 20%, 0603
AVX, 0603YC474MAT2A
10
1
C6
Cap., X7R, 0.1µF, 16V, 20%, 0603
AVX, 0603YC104MAT2A
11
1
C7
Cap., X7R, 0.1µF, 100V, 20%, 0805
TDK, C2012X7R2A104M
12
1
C8
CAP., NPO, 68pF, 50V, 5%, 0603
AVX, 06035A680JAT2A
13
1
D1
DIODE, PDS540, POWERDI5-2PIN
DIODES INC, PDS540-13
14
1
L1
IND, 10uH, 20%, D104C
TOKO, 919AS-100M=P3
15
1
Q1
TRANSISTOR, SI7129DN, PWRPAK1212-8
VISHAY, Si7129DN-T1-GE3
16
1
R1
RES., CHIP, 61.9k, 1/16W, 1% , 0603
VISHAY, CRCW060361K9FKED
17
1
R2
RES., CHIP, 14.7k, 1/16W, 1% , 0603
VISHAY, CRCW060314K7FKED
18
1
R3
RES., CHIP, 80.6k, 1/16W, 1% , 0603
VISHAY, CRCW060380K6FKED
19
1
R5
RES., CHIP, 523k, 1/16W, 1% , 0603
VISHAY, CRCW0603523KFKED
20
1
R7
RES., 0.016 1/2W 1% 2010
VISHAY, WSL2010R0160FEA
21
1
R8
RES., CHIP, 100k, 1/16W, 1% , 0603
VISHAY, CRCW0603100KFKED
22
1
R9
RES., CHIP, 698k, 1/10W, 1% , 0603
VISHAY, CRCW0603698KFKED
23
1
R11
RES., CHIP, 45.3k, 1/16W, 1% , 0603
VISHAY, CRCW060345K3FKED
24
1
U1
IC, LTC3863EMSE, MSE12
LINEAR TECH.CORP. LTC3863EMSE
Additional Demo Board Circuit Components
25
0
COUT6
CAP., OPT KE0
OPT
26
0
C4
CAP., OPT 0603
OPT
27
1
R4
RES., OPT 0603
OPT
28
2
R6, R10
RES., CHIP, 0Ω, 1/16W, 0603
VISHAY, CRCW06030000Z0ED
Hardware For Demo Board Only
29
7
E1, E2, E3, E4, E5, E6, E7
TESTPOINT, TURRET, .090” pbf
MILL-MAX, 2501-2-00-80-00-00-07-0
30
2
JP1, JP3
JMP, 0.079 SINGLE ROW HEADER, 3-PIN
SULLINS, NRPN031PAEN-RC
31
1
JP2
JMP, 0.079 DOUBLE ROW HEADER, 6-PIN
SULLINS, NRPN062PAEN-RC
32
4
J1, J2, J3, J4
CONN, BANANA JACK
KEYSTONE 575-4
33
3
XJP1, XJP2, XJP3
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
34
4
MTGS AT 4 CORNERS
STAND-OFF, SNAP ON NYLON 0.50" tall
KEYSTONE, 8833(SNAP ON)
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DEMO MANUAL DC1737A
SCHEMATIC DIAGRAM
dc1737af
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 DC1737A
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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Linear Technology Corporation
LT 0513 • 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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