DEMO MANUAL DC2001A
LTC3787EUFD
4-Phase High Current
Synchronous
Step-Up Converter
Description
Demonstration circuit 2001A is a step-up DC/DC converter
using two
LTC3787EUFD
dual-phase synchronous boost
controllers in a parallel configuration for high current, high
power 4-phase operation.
The DC2001A has an input supply voltage range from
6V to 24V. The converter provides an output voltage of
24V, with a very high efficiency output of 25A to 30A, as
shown in Figure 2.
The
LTC3787
data sheet gives a complete description
of the part, operation and application information, and
must be read in conjunction with this demo manual for
the DC2001A.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
performance summary
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage
Default Operating Frequency
Efficiency
Specifications are at T
A
= 25°C
CONDITIONS
I
OUT
= 0A to 25A
I
OUT
= 0A to 30A
V
IN
= 6V to 24V, MODE = FCC
FREQ = GND
V
IN
= 18V, V
O
= 24V, I
O
= 30A
UNITS
6V
24V
24V ±2%
350kHz
98.2%
dc2001af
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DEMO MANUAL DC2001A
Quick start proceDure
Demonstration circuit 2001A is easy to set up to evalu-
ate the performance of the LTC3787. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below.
1. Set the jumper as follows:
JP1:
JP2:
FCC
ON
4. Turn on the supply and adjust the voltage to the desired
value, up to 24V, while monitoring the output.
NOTE: Do not exceed 33V input.
5. Once the proper output voltage has been established,
increase the current limit as necessary.
6. Turn on the load and adjust as necessary.
Optional
1. For pulse skip or Burst Mode
®
operation, set jumper
JP1 to PS or BM.
2. To shut down switching, set jumper JP2 to OFF.
3. For power good indication, monitor PGOOD.
4. For external clock synchronization, connect the clock
source to CLKIN and remove jumper JP1.
–
+
2. With all power off, connect the input power supply,
load, and meters using heavy duty cables, as shown in
Figure 1.
NOTE: Input supply must be capable of at least 65A at
12V, or 110A at 6V.
3. Preset the system load to 0A and the input supply to
12V, 2A current limit.
V
OUT
LOAD
–
V
OUT
+
A
I
OUT
–
V
IN
+
A
+
–
I
IN
dc2001a F01
V
IN
SUPPLY
Figure 1. Proper Measurement Equipment Setup
dc2001af
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DEMO MANUAL DC2001A
parts List
ITEM
1
QTY
32
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
TDK, C4532X7R1E226M
Required Circuit Components
CAP, X7R, 22µF, 20%, 25V, 1812
CIN1A-CIN4A, CIN1B-CIN4B, CIN7A-
CIN10A, CIN7B-CIN10B, COUT1A-COUT2A,
COUT1B-COUT2B, COUT4A-COUT5A,
COUT4B-COUT5B, COUT7A-COUT8A,
COUT7B-COUT8B, COUT10A-COUT11A,
COUT10B-COUT11B
CIN5-CIN6, CIN11-CIN12, COUT3, COUT6,
COUT9, COUT12
C1, C10, C16-C17, C26, C31-C33
C2, C7-C8, C11, C19, C23-C24, C27
C4, C21
C5, C13, C15, C22, C29
C9, C25
C14, C30
D1-D4
L1-L4
Q1A-Q8A, Q2B, Q4B, Q6B, Q8B
R1
R5-R6, R17, R20, R31-R32, R39, R41
R11, R35
R15, R19
R22
R24
R25, R28
R26, R45
R36
RSNS1-RSNS8
U1, U2
C3, C6, C12, C18, C20, C28
R2, R3, R7, R10, R13, R16, R34, R46-R49
CAP, 330µF, 20%, 35V, ELECT
CAP, X7R, 0.01µF, 5%, 25V, 0603
CAP, X7R, 0.1µF, 10%, 25V, 0603
CAP, X7R, 1µF, 10%, 16V, 0603
CAP, NPO, 10pF, 5%, 25V, 0603
CAP, X5R, 4.7µF, 20%, 25V, 0805
CAP, NPO, 1000pF, 5%, 25V, 0603
DIODE, SCHOTTKY, 30V, SOD123
IND, 1.0µH
XSTR, MOSFET N-CHANNEL
RES, 100k, 5%, 1/10W, 0603
RES, 10Ω, 5%, 1/10W, 0603
RES, 2.2Ω, 5%, 1/10W, 0603
RES, 10k, 5%, 1/10W, 0603
RES, 38.3k, 1%, 1/10W, 0603
RES, 232k, 1%, 1/10W, 0603
RES, 12.1k, 1%, 1/10W, 0603
RES, 22.1k, 1%, 1/10W, 0603
RES, 100Ω, 5%, 1/10W, 0603
RES, 0.003Ω, 1%, 1W, 2512
IC, LTC3787EUFD#PBF
CAP, OPTIONAL, 0603
RES, OPTIONAL, 0603
VISHAY, CRCW06030000Z0EA
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
2
3
4
8
8
8
2
5
2
2
4
4
12
1
8
2
2
1
1
2
2
1
8
2
0
0
18
0
NIPPON CHEMI-CON,
EMZA350ADA331MJA0G
AVX, 06033C103JAT2A
TDK, C1608X7R1E104K
TAIYO YUDEN, EMK107BJ105KA-T
AVX, 06033A100JAT2A
TAIYO YUDEN, TMK212BJ475MG-T
AVX, 06033A102JAT2A
INFINEON, BAS140W
COILCRAFT, SER2010-102MLB
INFINEON, BSC014N04LSI
VISHAY, CRCW0603100KJNEA
VISHAY, CRCW060310R0JNEA
VISHAY, CRCW06032R20JNEA
VISHAY, CRCW060310K0JNEA
VISHAY, CRCW060338K3FKEA
VISHAY, CRCW0603232KFKEA
VISHAY, CRCW060312K1FKEA
VISHAY, CRCW060322K1FKEA
VISHAY, CRCW0603100RJNEA
PANASONIC, ERJM1WSF3M0U
LINEAR TECHNOLOGY, LTC3787EUFD#PBF
Additional Demo Board Circuit Components
R4, R8-R9, R12, R14, R18, R21, R23, R27, RES, 0Ω, JUMPER, 0603
R29-R30, R33, R37-R38, R40, R42-R44
Q1B, Q3B, Q5B, Q7B
XSTR, MOSFET N-CHAN OPTIONAL
dc2001af
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