DC2236A-B - Demo Manual

DEMO MANUAL DC2236A-B
LTC3890
60V, Low IQ Multiphase Synchronous
Step-Down Converter
DESCRIPTION
Demonstration circuit 2236A-B is a high output voltage,
high efficiency synchronous PolyPhase® buck converter
featuring the LTC®3890EUH. The DC2236A-B has wide
input voltage range of 16V up to 60V, and is capable of
delivering up to 25A of output current. The output voltage
is set to 12V, however, the output voltage can go as high
as 24V, with certain modifications. The DC2236A-B supports three operation modes: Fixed frequency modulation,
pulse-skipping and Burst Mode® operation. Fixed frequency
mode of operation maximizes the output current, reduces
output voltage ripple, and yields a low noise switching
spectrum. Burst Mode employs a variable frequency
switching algorithm that minimizes the no-load input
quiescent current and improves efficiency at light loads.
The DC2236A-B consumes less than 50µA of quiescent
current during shutdown and less than 1mA under a no
load condition with the output in regulation in Burst Mode
operation. The DC2236A-B has a standard operating
frequency of 150kHz, but can be adjusted to frequencies
as high as 900kHz. The DC2236A is a dual phase single
output step-down converter; however it designed to be
easily transformed to 4- or 6-phase system by combining two or three DC2236A-B boards. The LTC3890EUH
data sheet gives a complete description of these parts,
operation and application information and must be read
in conjunction with this quick start guide for demonstration circuit 2236A-B. Table 1 summarizes the differences
between the parts in the LTC3890 family.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2236A-B
L, LT, LTC, LTM, Linear Technology, Burst Mode, PolyPhase and the Linear logo 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
PARAMETER
CONDITIONS
Minimum Input Voltage
16V
Maximum Input Voltage
Output Voltage VOUT Regulation
60V
VIN = 16V to 55V
Maximum Continuous Output Current
Preset Operating Frequency
12V ± 2%
25A
R7 = 30.1kΩ
External Clock Sync. Frequency Range
Efficiency
VALUE
150kHz
75kHz to 850kHz
VIN = 36V, VOUT = 12V, IOUT = 12A, See Figure 3 Efficiency Curves for
Complete Operating Range
97%
Typical Output Ripple VOUT
VIN = 36V, IOUT = 12A (20MHz BW)
Quiescent Current at Shutdown
VIN = 16V to 55V
<35mVP-P
<50µA
Input Current at No Load
VIN = 16V to 55V
<1mA
dc2236abf
1
DEMO MANUAL DC2236A-B
QUICK START PROCEDURE
Demonstration circuit 2236A-B is easy to set up to evaluate
the performance of the LTC3890. For proper measurement
equipment configuration, set up the circuit according to
the diagram in Figure 1. Before proceeding to test, insert
shunt into JP1 (RUN) OFF position, which connects the
RUN pin to ground (GND), and thus, shuts down the circuit.
2.Turn on the circuit by inserting the shunt in header JP1
(RUN) into the ON position. The output voltage should
be regulating. Measure VOUT – it should measure 12V
± 2% (Do not apply more than the rated maximum
voltage of 60V to the board or the part may be damaged).
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.
3.Vary the converter load, which should not exceed 25A.
Note: all four input and output terminals VIN, VOUT and
two GND equipped with two banana connectors, twowires can be used for each terminal to reduce copper
looses and heat dissipation in the interconnection lines.
1.With the DC2236A-B set up according to the proper
measurement and equipment in Figure 1, apply 20V at
VIN. Measure VOUT; it should read 0V. If desired, one
can measure the shutdown supply current at this point.
The supply current will be approximately 50µA, or less,
in shutdown.
4.Vary the input voltage from 16V to 55V, the VOUT – it
should measure 12V ± 2%
5.Set output current to zero and move jumper JP2 (MODE)
into BURST MODE position and measure VOUT – it
should register 12V ± 2%.
6.Set output current to zero and move jumper JP2 (MODE)
into PLS SKIP position and measure VOUT – it should
register 12V ± 2%
Figure 1. Proper Measurement Equipment Setup
dc2236abf
2
DEMO MANUAL DC2236A-B
QUICK START PROCEDURE
Table 1. Summary of the Differences Between the Parts in the LTC3890 Family
LTC3890
LTC3890-1
LTC3890-2
LTC3890-3
ILIM Pin for Adjustable
Current Sense Voltage?
Yes
No
Yes
No
CLKOUT and PHASMD Pins
for PolyPhase® Operation?
Yes
No
Yes
No
Independent PGOOD Pins for
Each Channel
Yes; PGOOD1 and PGOOD2
No; PGOOD1 Only
Yes; PGOOD1 and PGOOD2
No; PGOOD1 Only
Overvoltage Protection
Bottom Gate “Crowbar?”
Yes
Yes
No; BG Not Forced On
No; BG Not Forced On
Current Foldback During
Overcurrent Events
Yes
Yes
No
No
Forced Continuous
Forced Continuous
Pulse-Skipping
Pulse-Skipping
Operation with SENSE
Common Mode < 0.5V
Requires VFB < 0.65V
Operation with SENSE
Common Mode < 0.5V
Requires VFB < 0.65V
Not Dependent on VFB
Voltage. Makes It Easy to
Make a Non-synchronous
Boost or SEPIC Converter
with Ground-Referenced
Current Sensing
Not Dependent on VFB
Voltage. Makes It Easy to
Make a Non-synchronous
Boost or SEPIC Converter
with Ground-Referenced
Current Sensing
Light Load Operation When
Synchronized to External
Clock Using PLLIN/MODE Pin
SENSE Pins Common Mode
Range
dc2236abf
3
DEMO MANUAL DC2236A-B
QUICK START PROCEDURE
GND
VIN
Figure 2. Measuring Input or Output Ripple
99.5
24V
36V
48V
99.0
η (%)
98.5
98.0
97.5
97.0
96.5
96.0
5
10
20
15
LOAD (A)
25
30
dc2236ab F03
Figure 3. Efficiency vs Load
0.22
0.20
IIN (mA)
0.18
0.16
0.14
0.12
0.10
20
25
30
35
VIN (V)
40
45
50
dc2236ab F04
Figure 4. Input Current at No Load vs Input Voltage (Burst Mode)
dc2236abf
4
DEMO MANUAL DC2236A-B
QUICK START PROCEDURE
Figure 5. Output Noise, VIN 36V, IO 12A
Figure 6. Thermal Map, VIN 48V, VO 12V, IO 25A, No Air Flow
dc2236abf
5
DEMO MANUAL DC2236A-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., ALUM., 56µF, 63V, 20%
SUN ELECT., 63HVH56M
Required Circuit Components
1
2
C1, C29
2
6
C2, C3, C4, C5, C6, C7
CAP., X7R, 2.2µF, 100V, 10%, 1812
TDK, C4532X7R2A225K
3
2
C8, C26
CAP., NPO, 2.2pF, 50V, ±0.25pF, 0603
AVX, 06035A2R2CAT
4
1
C9
CAP., X7S, 1µF, 100V, 10%, 0805
TDK, C2012X7S2A105K330
5
4
C11, C14, C23, C24
CAP., X5R, 10µF, 50V, 1210, 20%
TAIYO YUDEN, UMK325BJ106MM-T
6
3
C12, C16, C21
CAP., X7R, 0.1µF, 50V, 10%, 0603
TDK, C1608X7R1H104K
7
2
C15, C25
CAP., Sanyo, 150µF, 16V, 20%
SANYO, 16TSVPC150
8
1
C17
CAP., X7R, 4.7nF, 100V, 10%, 0603
AVX, 06031C472KAT
9
2
C18, C19
CAP., NPO, 47pF, 25V, 10%, 0603
AVX, 06033A470KAT2A
10
2
C20
CAP., X7R, 4.7µF, 10V, 10%, 0603
TAIYO YUDEN, LMK107BJ475KA-T
11
1
C22
CAP., NPO, 10pF, 25V, 10%, 0603
AVX, 06033A100KAT2A
12
1
C27
CAP., X5R, 1µF, 25V, 10%, 0603
AVX, 06033D105KAT2A
13
2
D1, D2
DIODE, SCHOTTKY, DFLS1100, PDI-123
DIODES, INC., DFLS1100
14
2
L1, L2
IND., 10µH, SMD
COILCRAFT SER2915L-103KL
15
2
Q1, Q4
RENESAS, N CH POWER MOS FET
RENESAS, RJK0651DPB
16
2
Q2, Q5
RENESAS, N CH POWER MOS FET
RENESAS, RJK0653DPB
17
1
R1
RES., 2.2Ω 1%, 1/10W, 0603
VISHAY, CRCW06032R20FNEA
18
2
R4, R22
RES., 100Ω 1%, 1/10W, 0603
VISHAY, CRCW0603100RFKEA
19
6
R2, R10, R14, R15, R24, R27
RES., 0Ω, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
20
1
R6
RES., 1M, 5%, 0805
VISHAY, CRCW08051M00JNED
21
1
R7
RES., 30.1k, 1%, 1/10W, 0603
VISHAY, CRCW060330K1FKEA
22
2
R8, R19
RES., 0.003Ω, 1%, 1/2W, 2010
VISHAY, WSL20103L000FEA
23
1
R9
RES., 57.6k, 1%, 1/10W, 0603
VISHAY, CRCW060357K6FKEA
24
2
R12, R18
RES., 0Ω, 1/10W, 0805
VISHAY, CRCW08050000Z0EA
25
1
R13
RES., 9.76k, 1%, 1/10W, 0603
VISHAY, CRCW060315K0FKEA
26
1
R16
RES., 499k, 1%, 1/10W, 0603
VISHAY, CRCW0603499KFKEA
27
1
R20
RES., 35.7k, 1%, 1/10W, 0603
VISHAY, CRCW060335K7FKEA
28
2
R21, R29
RES., 100k, 1%, 1/10W, 0603
VISHAY, CRCW0603100KFKEA
29
1
R28
RES., 1k, 1%, 1/10W, 0603
VISHAY, CRCW06031K00FKEA
30
1
U1
I.C., LTC3890EUH, QFN-32-UH
LINEAR TECH. LTC3890EUH
Additional Demo Board Circuit Components
1
0
R3, R5, C10, C13, R25, R26, C28
OPT
0603 PACKAGE
2
0
Q3, Q6, Q7, Q8
OPT
LFPAK PACKAGE
TESTPOINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
Hardware: For Demo Board Only
1
11
E1-E11
2
2
JP1, JP2
JMP, 3PIN 1 ROW, 0.079"
SAMTEC, TMM-103-02-L-S
3
2
XJP1, XJP2
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
4
7
J1-J8
CONNECTOR, BANANA JACK
KEYSTONE, 575-4
5
4
MTGS AT 4 CORNERS
STANDOFF, NYLON 0.5 1/2"
KEYSTONE, 8833(SNAP-ON)
dc2236abf
6
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.
1
2
3
4
J1
J2
JP1
EXTVCC
PGOOD
E3
E1
0
R15
3
2
1
RUN
E4
J4
J3
VOUT
OFF
ON
GND
16V UP TO 60V
VIN
A
R27
0
R1 2.2
R21
100K
1%
C27
1uF
47pF
R14
0
0.1uF
C12
TP2
TP4
R10 0
1%
R7 30.1K
CLKOUT
EXTVCC
ILIM
PGOOD2
PGOOD1
PGND
VFB2
VFB1
SGND
SGND
ITH2
ITH1
TRACK/SS2
TRACK/SS1
RUN2
RUN1
FREQ
PHASEMD
[2]
LTC3890EUH-2
LTC3890EUH
-B
IC
-A
VERSION
B
1. ALL RESISTORS AND CAPACITORS ARE 0603.
4
20
28
14
27
21
11
31
33
6
12
30
13
29
8
7
2
3
C3
2.2uF INTVCC
100V
1812
R3
R5
OPT
OPT
C13 OPT
C19
INTVCC
VOUT
TP3
47pF
C17 1%
4.7nF C18
R13 9.76K
TP1
TP6
C2
2.2uF
100V
1812
NOTE: UNLESS OTHERWISE SPECIFIED
R26
OPT
R25
OPT
INTVCC
C29
56uF
63V
63HVH56M
+
C22
10pF
R9
57.6K
1%
R20
35.7K
1%
R16
499K
1%
C10
OPT
R6
1M
0805
VIN
C1
56uF
+
63V
63HVH56M
VIN
22
VIN
E2
GND
GND
[2]
U1
C9
1uF
100V
0805
E11
E10
PLLIN/MOD
SENSE2-
SENSE2+
BG2
BOOST2
SW2
TG2
INTVCC
BG1
BOOST1
SW1
TG1
SENSE1+
SENSE1-
5
9
10
18
17
16
15
19
23
24
25
26
32
1
2
1
C20 4.7uF
2
C21
0.1uF
1
C
C26
2.2pF
Q4
4
VIN
4
Q3
OPT
Q8
OPT
L2 10uH
4
4
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
Q6
OPT
C28
OPT
S2
1K 1%
R28
D
SCALE = NONE
C23
10uF
50V
1210
C11
10uF
50V
1210
PRODUCTION
DATE
VICTOR K.
APPROVED
VOUT
S2
S1
SW2
SW1
E9
E8
J8
SW1
SW2
S1
S2
SYNC
GND
C25
+ 150uF
16V
16SVPC150M
J7
E7
E6
J6
GND
VOUT
J5
C15 [email protected]
150uF
+
16V
16SVPC150M
E5
04/07/14
DATE:
N/A
SIZE
E
SHEET 1
LTC3890EUH-2/LTC3890EUH
DEMO CIRCUIT 2236A-A/B
Friday, June 20, 2014
IC NO.
2
OF 1
REV.
POLYPHASE HIGH VOLTAGE STEP-DOWN CONVERTER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C24
10uF
50V
1210
C14
10uF
50V
1210
VOUT
E
REVISION HISTORY
DESCRIPTION
TECHNOLOGY
C7
2.2uF
100V
1812
R19
0.003
1%
2010
C6
2.2uF
100V
1812
2010
VICTOR K. TITLE: SCHEMATIC
AK/MI
APPROVALS
INTVCC
R29
1
-
R8
0.003
1%
REV
ECO
C5
2.2uF
100V
1812
SER2915L-103KL
4
100K 1%
CUSTOMER NOTICE
D
L1 10uH
SER2915L-103KL S1
C4
2.2uF
100V
1812
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
2
4
6
MODE
Q5
RJK0653DPB
SW2
RJK0651DPB
JP2
FCC
5
PLS SKIP 3
BURST
1
R24 0
R22 100 1%
0805 D2 DFLS1100
R18 0
INTVCC
0805 D1 DFLS1100 10V
R12 0
SW1
Q2
RJK0653DPB 4
4
Q7
OPT
4
VIN
Q1
RJK0651DPB
R4 100 1%
R2 0
C16
0.1uF
C8
2.2pF
5
1
2
3
C
1
2
3
B
5
1
2
3
5
1
2
3
5
1
2
3
5
5
1
2
3
5
1
2
3
5
1
2
3
A
1
2
3
4
DEMO MANUAL DC2236A-B
SCHEMATIC DIAGRAM
dc2236abf
7
DEMO MANUAL DC2236A-B
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
dc2236abf
8
Linear Technology Corporation
LT 0714 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
Similar pages