DC1675A - Demo Manual

DEMO MANUAL DC1675A
LTC3829
High Efficiency, 6-Phase,
Single Output, Synchronous
Buck Converter
DESCRIPTION
Demonstration circuit 1675A is a high efficiency, 6-phase,
synchronous buck converter with a 7V to 14V input range
that utilizes two LTC®3829 controllers. It can supply 120A
maximum load current with a 1.5V output voltage. The
LTC3829 is a feature-rich single-output 3-phase synchronous buck controller with on-chip drivers and remote output
voltage sensing. This board is set up with a sense resistor
configuration for current sensing. Optional inductor DCR
current sensing is possible. The temperature compensation function can guarantee accurate current limit over a
wide temperature range with DCR sensing.
The Stage Shedding™ function allows the controller to
decrease the number of phases to one during a light load
condition to save switching losses. Nonlinear control and
active voltage positioning (AVP) can improve the transient
response. The LTC3829 is suitable for an input voltage
ranging from 4.5V to 38V and an output voltage up to
5V. It can provide high efficiency, high power density and
PERFORMANCE SUMMARY
PARAMETER
versatile power solutions for telecom and datacom systems,
industrial and medical instruments, DC power distribution
systems and computer systems. The LTC3829 is available
in 38-pin 5mm × 7mm QFN and 38-pin TSSOP packages.
To shut down the converter, set the RUN pin voltage below
1.2V (JP1: Off). Use the JP4 jumper to select Burst Mode®
operation, stage shedding mode or forced continuous mode
operation at light load. The nonlinear control function is
set by JP5 and JP6. The switching frequency is pre-set at
about 400kHz, and can be easily modified from 250kHz to
770kHz. An on-board dynamic circuit is also available for
a transient test. Please see LTC3829 data sheet for more
detailed information.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and Stage Shedding is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
(TA = 25°C)
CONDITION
Input Voltage Range
VALUE
7V to 14V
Output Voltage, VOUT
VIN = 7V to 14V, IOUT = 0A to 120A
1.5V ±2%
Maximum Output Current, IOUT
VIN = 7V to 14V, VOUT = 1.5V
120A
Typical Efficiency
VIN = 12V, VOUT = 1.5V, IOUT = 120A
87.6%
Typical Switching Frequency
400kHz
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DEMO MANUAL DC1675A
QUICK START PROCEDURE
Demonstration circuit 1675A is easy to set up to evaluate
the performance of the LTC3829. Refer to Figure 1 for
the proper measurement equipment setup and follow the
procedure below:
1. With power off, connect the input power supply to VIN
(7V-14V) and GND (input return).
2. Connect the 1.5V output load between VOUT and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs. Set default
jumper position: JP1: ON; JP2: OFF; JP3: OFF; JP4:
FORCE CONTINUOUS; JP5: OFF; JP6: OFF
4. Turn on the input power supply and check for the proper
output voltages. VOUT should be 1.5V ±2%.
5. Once the proper output voltages are established, adjust the loads within the operating range and observe
the output voltage regulation, ripple voltage and other
parameters.
Note: When measuring the output or input voltage ripple,
do not use the long ground lead on the oscilloscope probe.
See Figure 2 for the proper scope probe technique. Short,
stiff leads need to be soldered to the (+) and (–) terminals
of an output capacitor. The probe’s ground ring needs to
touch the (–) lead and the probe tip needs to touch the
(+) lead.
CURRENT SHUNT
+
+
–
V
–
+
V
CURRENT SHUNT
–
+
IIN
V
IOUT
–
+
LOAD
+
V
–
–
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1675A
QUICK START PROCEDURE
Figure 2. Measuring Output Voltage Ripple
95
EFFICIENCY (%)
90
85
VOUT = 1.5V
fSW = 400kHz
CCM
VIN = 7V
VIN = 12V
VIN = 14V
80
75
70
0
20
40
60
80
LOAD CURRENT (A)
100
120
DC1675A F03
Figure 3. Efficiency vs Load Current
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DEMO MANUAL DC1675A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
12
CIN1, CIN2, CIN3, CIN4, CIN5, CIN6, CIN11,
CIN12, CIN13, CIN14, CIN15, CIN16
Cap., X5R 10μF 16V 10%,1210
AVX, 1210YD106KAT2A
2
3
CIN7, CIN8, CIN9
Cap., OSCON 180μF 16V 20%
SANYO 16SVP180MX
3
6
COUT1, COUT4, COUT7, COUT22, COUT25,
COUT28
Cap., X5R 100μF 6.3V 10%,1210
AVX, 12106D107KAT2A
4
12
COUT2, COUT3, COUT5, COUT6, COUT8,
Cap., POSCAP 330μF 2.5V 20%
COUT9, COUT23, COUT24, COUT26, COUT27,
COUT29, COUT30
SANYO 2R5TPE330M9
5
3
COUT10, COUT11, C63
Cap., X7R 1μF 25V 10%,0805
AVX, 08053C105KAT9A
6
1
C1
Cap., NPO 100pF 16V 10%,0603
AVX, 0603YA101KAT2A
7
2
C3, C67
Cap., X7R 1μF 16V 10%,0603
AVX, 0603YC105KAT
8
2
C4, C78
CAP., NPO 22pF 16V 10% 0603
AVX, 0603YA220KAT
9
1
C5
Cap., X7R 0.0022μF 50V 10%,0603
AVX, 06035C222KAT2A
10
15
C10, C24, C25, C26, C40, C53, C55, C56, C62, Cap., X5R 0.1μF 25V 5%,0603
C69, C73, C77, C79, C80, C86
11
2
C11, C74
Cap., X5R 4.7μF 10V 10%,0805
AVX, 0805ZD475KAT
12
6
C21, C22, C23, C81, C82, C83
Cap., NPO 1000pF 25V 5%,0603
AVX, 06033A102JAT2A
13
3
C44, C57, C58
Cap., X7R 0.01μF 50V 10%,0603
AVX, 06035C103KAT2A
14
1
C52
Cap., NPO 100pF 50V 5%,1206
AVX, 12065A101JAT2A
15
5
C54, C61, C65, C66, C68
Cap., X7R 4.7μF 25V 10%,1206
AVX, 12063C475KAT
16
1
C60
Cap., X5R 0.47μF 16V 10%,0603
AVX 0603YD474KAT2A
17
1
C64
Cap., NPO 10pF 25V 5%,0603
AVX, 06033A100JAT
18
2
C70, C71
Cap., X7R 10μF 16V 10%,1206
AVX, 1206YC105KAT
19
6
D1, D2, D3, D8, D9, D10
Schottky Diode, 30V
Central Semi. CMDSH-3
20
1
D4
Zener Diode, 5.1V
On Semi. MMBZ5231BLT1G
21
1
D5
Schottky Diode
Diodes Inc. BAT54S
22
2
D6,D7
Diode Schotkky, 40V
Diodes Inc. B0540W-7
23
6
L1, L2, L3, L4, L5, L6
Inductor, 0.33μH
Wurth, 744308033
24
1
L7
Inductor, 10μH
Sumida,CLS62RC-100
25
1
L8
Inductor, 10μH, CMD series
SUMIDA, CMD4D08NP-100MC
26
6
Q1, Q5, Q9, Q17, Q21, Q25
N-Chanel Pwr MOSFET
RENESAS, RJK0305DPB
27
12
Q3, Q4, Q7, Q8, Q11, Q12, Q19 Q20, Q23,
Q24, Q27, Q28
N-Chanel Pwr MOSFET
RENESAS, RJK0330DPB
28
1
Q13
NPN Transistors, SOT23
Zetex, FMMT619TA
29
2
Q14, Q15
MOSFET, N-Channel 30V
Siliconix, SUD50N03-09P
30
1
Q16
PNP Transistors, SOT23
Zetex, FMMT718TA
31
6
RSNS1, RSNS2, RSNS3, RSNS4, RSNS5,
RSNS6
Res., Chip, 0.001Ω, 1%, 2010_Kelvin
VISHAY, WSL20101L000FEA
32
1
R1
Res., Chip, 30.1k, 1%, 0603
VISHAY, CRCW060330K1FKEA
33
1
R2
Res., Chip, 20.0k, 1%, 0603
VISHAY, CRCW060320K0FKEA
34
20
R3, R13, R27, R28, R29, R35, R45, R87,
R90, R96, R104, R107, R108, R121, R123,
R125, R131, R132, R133, R134
Res., Chip, 0Ω, 0603
VISHAY, CRCW06030000Z0EA
AVX 06033D104JAT2A
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DEMO MANUAL DC1675A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
35
2
R4, R92
Res., Chip, 66.5Ω, 1%, 0603
VISHAY,CRCW060366R5FKEA
36
1
R5
Res., Chip, 35.7k, 1%, 0603
VISHAY, CRCW060335K7FKEA
37
2
R6,R8
Res., Chip, 10Ω, 1%, 0603
VISHAY, CRCW060310RFKEA
38
1
R7
Res., Chip, 4.87k, 1%, 0603
VISHAY, CRCW06034K87FKEA
39
2
R9, R106
Res., Chip, 27.4k, 1%,0603
VISHAY, CRCW060327K4FKEA
40
2
R10, R95
Res., Chip, 2.2Ω, 1%, 0603
VISHAY, CRCW06032R20FNEA
41
3
R11, R61, R93
Res., Chip, 100k, 1%, 0603
VISHAY, CRCW0603100KFKEA
42
12
R21, R22, R23, R24, R25, R26, R112, R113,
R114, R115, R116, R117
Res., Chip, 100Ω, 1%, 0603
VISHAY, CRCW0603100RFKEA
43
2
R47, R122
Res., Chip, 28k, 1%, 0603
VISHAY, CRCW060328KFKEA
44
1
R69
Res., Chip, 390k, 1%, 0603
VISHAY, CRCW0603390K0FKEA
45
1
R70
Res., Chip, 110k, 1%, 0603
VISHAY, CRCW0603110K0FKEA
46
2
R71, R74
Pot. 11 Turns 50k
Bourns 3313J-1-503E
47
1
R77
Pot. 3386-3/8 Square
Bourns 3386P-1-503LF
48
1
R72
Res., Chip, 1.5k, 1%, 0603
VISHAY, CRCW06031K50FKEA
49
1
R75
Res., Chip, 7.5k, 1%, 0603
VISHAY, CRCW06037K50FKEA
50
1
R76
Res., Chip, 1k, 1%, 0603
VISHAY, CRCW06031K0FKEA
51
1
R78
Res., Chip, 2k, 1%, 0603
VISHAY, CRCW06032K00FKEA
52
4
R79, R80, R81, R82
Res., Chip, 0.010Ω, 0.5W 1%
VISHAY, WSL2010R0100FEA
53
1
R83
Res., Chip, 115k, 1%, 0603
VISHAY, CRCW0603115KFKEA
54
1
R84
Res., Chip, 13.3k, 1%, 0603
VISHAY, CRCW060313K3FKEA
55
1
R86
Res., Chip, 30.1k, 1%, 0603
VISHAY, CRCW060330K1FKEA
56
1
R89
Res., Chip, 10k, 1%, 0603
VISHAY, CRCW060310K0FKEA
57
1
R98
Res., Chip, 30.9k, 1%, 0603
VISHAY, CRCW060330K9FKEA
58
2
U2, U1
I.C.,Volt. Reg., 38-Pin 7mm × 5mm QFN
Linear Tech., LTC3829EUHF
59
1
U3
I.C., Low Pwr Timer
TI, TLC555ID (4 [email protected])
60
1
U4
I.C., Volt. Reg.
Linear Tech. Corp. LT1930ES5
61
1
U5
I.C., Dual Op Amp
Linear Technology Corp. LT1361CS8
62
1
U6
I.C., LT1761ES5, SOT23
Linear Tech. Corp. LT1761ES5-SD
63
1
U7
I.C., Feedback Amp
Linear Tech. Corp. LT1210CR
64
1
VR1
I.C., Volt. Ref.
Linear Tech. Corp. LT1004CS8-1.2
Additional Demo Board Circuit Components
1
0
COUT16, COUT17, COUT18, COUT19,
COUT20, COUT21
Cap., 1210 OPT
2
0
OPT
RNTC1, C1, RNTC2, R12, R36, R41, C41,
R42, R51, C51, R52, R53, R54, R55, R56,
R57, R58, R59, R60, C72, R73, C75, C76,
C84, R85, C85, R88, R91, R94, R97, R99,
R100, R101, R102, R103, R105, R109, R110,
R111, R118, R119, R120, R124, R126, R127,
R128, R129, R130, R133, R135
3
0
COUT12, COUT13, COUT14, COUT15,
COUT31, COUT32, COUT33, COUT34
4
0
C59
Cap., 1206, OPT
5
0
Q2, Q6, Q10, Q18, Q22, Q26
OPT
Cap., 7343, OPT
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DEMO MANUAL DC1675A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Hardware-For Demo Board Only
1
4
J1, J2, J3, J4
Stud, Test Pin
PEM KFH-032-10
2
8
(J1, J2, J3, J4,) × 2
Nut, Brass Nuts #10-32
ANY #10-32
3
4
J1, J2, J3, J4
Ring, Lug Ring #10
KEYSTONE #10
4
4
J1, J2, J3, J4
Washer, Tin Plated Brass
ANY #10
5
15
E1-E14, E17
Turret, Testpoint , 091"
Mill Max 2501-2-00-80-00-00-07-0
6
5
JP1, JP2, JP3, JP5, JP6
Headers, 3 Pins 2mm Ctrs.
Samtec TMM-103-02-L-S
7
1
JP4
Headers, 4 Pins 2mm Ctrs.
Samtec TMM-104-02-L-S
8
6
XJP1, XJP2, XJP3, XJP4, XJP11, XJP12
Shunt, 2mm Ctrs.
Samtec 2SN-BK-G
9
2
J5, J6
CONN. VERT PC-MNT BNC 50Ω
CONNEX 112404
10
4
Stand-Off, Nylon 0.5" Tall
KEYSTONE, 8833(SNAP ON)
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DEMO MANUAL DC1675A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1675A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1675A
SCHEMATIC DIAGRAM
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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.
9
DEMO MANUAL DC1675A
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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