DC2341A - Demo Manual

DEMO MANUAL DC2341A
LTC7130EY
20V 20A Monolithic Buck Converter
with Ultra-Low DCR Sensing
DESCRIPTION
Demonstration circuit 2341A is a high efficiency synchronous buck DC/DC converter with 4.5V to 20V input
range. It can supply 20A maximum load current at 1.5V
output. The demo board features the LTC®7130 regulator.
No external MOSFETs are required. It employs an LTC
proprietary current sensing, current mode architecture,
allowing the use of a very low DC resistance (DCR) power
inductor to maximize efficiency in high current applications. Differential output voltage sensing along with a
precision internal reference combine to offer accurate
output regulation. The LTC7130 is housed in a 6.25mm
× 7.5mm × 2.22mm 63-pin BGA package.
The light load operation mode of the converter is determined with the MODE/PLLIN pin. Use the JP2 jumper to
select pulse-skipping mode (P.S.), Burst Mode® (BURST)
or forced continuous mode (CCM) operation. The converter
can also be externally synchronized through the MODE/
PLLIN pin (MODE/PLLIN terminal on the board; JP2: no
jumper or BURST position). To shut down the converter,
one simple way is to force the RUN pin below 1.1V (JP1:
OFF). The power good output (PGOOD terminal) is low
when the output voltage is outside of the ±10% regulation window.
The LTC7130 data sheet gives a complete description of
the operation and application information. The data sheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2341A
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.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
PARAMETER
CONDITIONS
Input Voltage Range
MIN
TYP
4.5
Output Voltage
VIN = 4.5V to 20V, IOUT = 0A to 20A
Maximum Output Current
VIN = 4.5V to 20V, VOUT = 1.5V
Typical Switching Frequency
MAX
20
UNITS
V
1.5 ±2%
V
20
A
530
kHz
Typical Efficiency
VIN = 12V, IOUT = 20A
89.2
Typical Output Voltage Ripple
VIN = 12V, IOUT = 20A
25
%
mVP-P
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1
DEMO MANUAL DC2341A
QUICK START PROCEDURE
Demonstration circuit 2341A is easy to set up to evaluate
the performance of the LTC7130. Refer to Figure 1 for
the proper measurement equipment setup and follow the
procedure below:
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.
1. With power off, connect the input power supply to VIN
(4.5V to 20V) and GND (input return).
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.
2. Connect the 1.5V output load between VOUT and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs.
4. Turn on the input power supply and check for the proper
output voltages. VOUT should be 1.5V ±2%.
Figure 1. Proper Measurement Equipment Setup
dc2341af
2
DEMO MANUAL DC2341A
QUICK START PROCEDURE
+
–
COUT
VOUT
GND
Figure 2. Measuring Output Voltage Ripple
100
95
EFFICIENCY (%)
90
85
80
75
70
65
60
4.5VIN
12VIN
20VIN
55
50
0
5
10
15
LOAD CURRENT (A)
20
dc2341a F03
Figure 3. Efficiency vs Load Current (VO = 1.5V, Burst Mode)
VO
50mV/DIV
AC-COUPLED
10A LOAD STEP
5A/DIV
TOTAL IO: 10A TO/
FROM 20A
dc2341a F04
Figure 4. Load Step Transient Test (VIN = 12V)
Figure 5. Thermal Picture (VIN = 12V, IO = 20A. 21°C Ambient,
No Forced Airflow)
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DEMO MANUAL DC2341A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
CIN1
CAP, ALUM ELEC180µF 20% 25V
PANASONIC., 25SVPF180M
2
2
CIN4, CIN5
CAP, 1210 22µF 20% 25V X5R
AVX, 12103D226MAT2A
3
1
CIN6
CAP, 1206 10µF 20% 25V X5R
AVX, 12063D106MAT2A
4
2
COUT1, COUT4
CAP, 7343 330µF 20% 2.5V POSCAP
PANASONIC, 2R5TPE330M9
5
4
COUT2, COUT3, C15, C16
CAP, 1210 100µF 20% 6.3V X5R
AVX, 12106D107MAT2A
6
2
C1, C17
CAP, 0805 1µF 10% 25V X5R
AVX, 08053D105KAT2A
7
2
C2, C5, C7
CAP, 0603 220nF 10% 25V X5R
MURATA GRM188R71E224KA88D
8
1
C10
CAP, 0603 0.1µF 10% 10V X5R
AVX, 0603ZD104KAT2A
9
1
C11
CAP, 2.2nF X7R 50V 5% 0603
AVX, 06035C222JAT2A
10
1
C12
CAP, 0603 120pF 10% 25V NPO
AVX, 06033A121KAT2A
11
2
C6, C14
CAP, 0805 4.7µF 20% 10V X5R
AVX, 0805ZD475MAT2A
12
1
D1
DOIDE, SCHOTTKY 30V SOD-323
CENTRAL SEMI., CMDSH-3 TR
13
1
L1
IND, 0.25µH
WURTH ELEKTRONIK, 744308025
14
1
Q1
MOSFET, N-CH D-S 40V TO252
VISHAY, SUD50N04-8M8P-4GE3
15
1
R1
RES, 2.2Ω 1/10W 5% 0603
VISHAY, CRCW06032R20JNEA
16
4
R8, R16, R17, R20
RES, 0Ω JUMPER 1/10W 0603
VISHAY, CRCW06030000Z0EA
17
2
R19, R30
RES, 10k 1/10W 5% 0603
VISHAY, CRCW060310K0JNEA
18
1
R28
SENSE RES, 2512 0.01Ω 1% 1W
VISHAY, WSL2512R0100FEA
19
1
R10
RES 0603 100k 1% 1/10W
VISHAY, CRCW0603100KFKEA
20
1
R13
RES 0603 1k 1% 1/10W
VISHAY, CRCW06031K00FKEA
21
1
R4
RES, 0603 619Ω 1% 1/10W
VISHAY, CRCW0603619RFKEA
22
2
R9, R12
RES, 0603 10Ω 5% 1/10W
VISHAY, CRCW060310R0JNEA
23
1
R24
RES, 0603 6.04k 1% 1/10W
VISHAY, CRCW06036K04FKEA
24
2
R3
RES, 0603 2.7Ω 1% 1/10W
VISHAY, CRCW06032R7FKEA
25
1
R23
RES, 0603 124k 1% 1/10W
VISHAY, CRCW0603124KFKEA
26
1
R11
RES, 0603 3.01k 1% 1/10W
VISHAY, CRCW06033K01FKEA
27
1
R5
RES, 0603 3.09k 1% 1/10W
VISHAY, CRCW06033K09FKEA
28
1
R32
RES, 0603 6.65k 1% 1/10W
VISHAY, CRCW06036K65FKEA
29
1
U1
IC, LTC7130EY#PBF
LINEAR TECH., LTC7130EY#PBF
Additional Demo Board Circuit Components
30
0
COUT5, COUT6 OPT
CAP, 7343 OPTION
31
0
CIN2, CIN3, (OPT)
CAP, OPTION
32
0
C3, C4, C8, C9, C13, (OPT)
CAP, 0603 OPTION
33
0
RN1, R2, R6, R7, R14, R15, R18, R22,
R25, R27, R29
RES, 0603 OPTION
Hardware: For Demo Board Only
34
13
E1-E13
TESTPOINT, TURRET, 0.094" PbF
MILL-MAX, 2501-2-00-80-00-00-07-0
35
1
JP2
HEADER, 4 PIN 0.079" SINGLE ROW
SULLINS, NRPN041PAEN-RC
36
1
JP1
HEADER, 3 PIN 0.079" SINGLE ROW
SULLINS, NRPN031PAEN-RC
37
4
J1-J4
JACK, BANANA
KEYSTONE 575-4
38
1
J5
CONN, BNC, 5 PINS
CONNEX, 112404
39
4
MH1, MH2, MH3, MH4
STAND-OFF, NYLON 0.50" tall
KEYSTONE, 8833
40
2
JP1, JP2
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
dc2341af
4
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
EXTVCC
PGOOD
CLKOUT
TRK/SS
E10
E9
E8
E7
E6
E3
MODE/PLLIN
RUN
R16 0
+
5
COUT5
OPT
7343
VOUT
+
E13
COUT6 IOUT
STEP
OPT
7343
C16
100uF
6.3V
1210
R28
0.010
2512
C1
1uF
25V
R1
2.2
4
R30
10K
C6
1
D6
R22
OPT
ITEMP
CLKOUT C3
SUD50N03-10CP-E3
Q1
C17
1
1uF
R29
OPT
2512
C2
D1
B6
D5
PGOOD C7
R13
1k
1%
R11
3.01k
1%
CIN5
22uF
25V
1210
C10
0.1uF
10V
R10
100k
CIN4
22uF
25V
1210
R20 0
MODE/PLLIN
JP2
3
2
C6
4.7uF
6.3V
CIN3
OPT
25V
INTVCC
VOUT
C15
100uF
6.3V
1210
CCM
BURST
P.S.
R2
OPT
VIN
+
R6
OPT
CIN2
OPT
25V
VIN
LOAD STEP CIRCUIT
EXTVCC
PGOOD
CLKOUT
C3
OPT
RUN
ON
OFF
1
3
JP1
GND
CIN1 +
180uF
25V
J2
GND
E2
4.5V - 20V
2
D
J1
VIN
1
4
VIN
ITEMP
CLKOUT
MODE/PLLIN
PGOOD
ILIM
INTVCC
RUN
SVIN
TK/SS
J5
GND
CIN6
10uF
25V
1206
4.7uF
6.3V
C14
IOSTEP CLK
E12
E11
VOUT
R23
124k
B5
4
FREQ
B7
A1
NC1
U1
LTC7130
SGND
SGND
SGND
SGND
C4
C5
B3
B4
E1
3
2
3
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
3
R24
6.04k
1%
C11
2.2nF
J4
J5
J6
J7
H4
H5
H6
H7
G4
G5
G6
F4
F5
F6
F7
E4
E5
E6
E7
G7
EXTVCC
D7
EXTVCC
A7
NC2
D2
D3
D4
E1
E2
E3
F2
F3
GND
GND
GND
GND
GND
GND
GND
GND
G1
G2
G3
H1
H2
H3
J1
J2
J3
R17
R32
6.65k
1%
R19
10k
1%
0
C7
220nF
C5
220nF
2.7
R14
OPT
R7
OPT
CMDSH-3
R3
CUSTOMER NOTICE
A6
A4
A2
A3
B1
B2
C1
F1
C2
0.22uF
25V
D1
C9
OPT
C8
OPT
R4
619
1%
VOUT
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
0
R8
VOUT
COUT2
100uF
6.3V
1210
2
REV
OPT
RN1
R9
10
COUT1
330uF
2.5V
7343
OPT
R27
1.5V
E5
E4
VO_SNS-
VO_SNS+
GND
20A MAX
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
OPT
C13
TECHNOLOGY
R25
OPT
+
COUT4
330uF
2.5V
7343
J4
J3 VOUT
DATE
9-2-15
DATE:
N/A
DC2341A
LTC7130EY
Wednesday, December 02, 2015
IC NO.
1
SHEET
1 OF
1
2
REV
HIGH EFFICIENCY STEP-DOWN CONVERTER
WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR
TITLE: SCHEMATIC
SIZE
R12
10
+
Charlie
COUT3
100uF
6.3V
1210
APPROVED
PRODUCTION
1
DESCRIPTION
REVISION HISTORY
TEMPERATURE COMPENSATION
NETWORK FOR DCR SENSING
ITEMP
R15 OPT
OPT
C4
R5
3.09k
1%
L1 0.25uH
DCR=0.37mOHM
__
ECO
744308025
CONTRACT NO.
R18
OPT
INTVCC
SW
2
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
APPROVALS
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. HZ
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
Charlie
ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
C12
120pF
VFB
DIFFOUT
DIFFN
DIFFP
SNSD+
SNS-
SNSA+
BOOST
SW
SW
SW
SW
SW
SW
SW
SW
SW
ITH
A5
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
2
3
4
5
2
1
5
A
B
C
D
DEMO MANUAL DC2341A
SCHEMATIC DIAGRAM
dc2341af
5
DEMO MANUAL DC2341A
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
dc2341af
6
Linear Technology Corporation
LT 0316 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
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