Owner's Manual for ANALOG DEVICES models including: DC2615A High Efficiency 15A Silent Switcher Buck Regulator, DC2615A, High Efficiency 15A Silent Switcher Buck Regulator, Silent Switcher Buck Regulator, Switcher Buck Regulator, Buck Regulator
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DocumentDocumentDEMO MANUAL DC2615A
LTC7151S High Efficiency 15A Silent Switcher Buck Regulator
DESCRIPTION
Demonstration circuit 2615A features the LTC®7151S in a high efficiency 1.2V/15A step-down regulator with an input voltage range of 3.1V to 20V and a 1MHz switching frequency. The Silent Switcher®2 technology reduces the switching noise while the internal MOSFETs of the LTC7151S provide high efficiency over a wide input voltage range. No current sense resistor is required.
The LTC7151S employs a controlled on-time, valley current mode architecture. This architecture allows for a short minimum on-time which is ideal for high stepdown ratios. In addition, the architecture provides a fast load step response by allowing the switch node pulses to compress after the load steps up see Figure 6.
Other features of the DC2615A include:
· Selectable light load operating modes of continuous conduction mode (CCM) or discontinuous mode (DCM).
· SYNC pin to synchronize the regulator to an external clock.
· PGOOD pin and RUN pin
The LTC7151S data sheet provides a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY Specifications are at TA = 25°C, No Airflow
PARAMETER Input Voltage Range Output Voltage Maximum Output Current Nominal Switching Frequency Typical Efficiency See Figure 3
CONDITIONS
VIN = 3.1V to 20V, IOUT = 0A to 15A VIN = 3.1V to 20V, VOUT = 1.2V
VIN = 12V, IOUT = 15A
VALUE 3.1V to 20V 1.2V ± 2% 15A 1MHz 87.6% Typical
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DEMO MANUAL DC2615A
QUICK START PROCEDURE
The evaluation setup for demonstration circuit 2615A is straight forward. Refer to the diagram shown in Figure 1.
Next, follow the procedure below:
1) With power off, connect the input supply, load and meters as shown in Figure 1. Preset the load to 0A and the VIN supply to 0V.
2) Place the RUN jumper in the ON position and the MODE jumper in the CCM/SYNC position.
3) Set the input voltage to 12V.
4) Check VOUT. The output voltage should be within the regulation limits shown in the performance summary table.
5) Apply 15A load and re-measure VOUT. It should be within the same regulation limits.
6) After the basic performance has been verified, the other aspects of performance can be measured and observed.
Note: To avoid large input voltage transients, do not hot plug the input supply to the DC2615A. Connect the input supply first and then turn it on.
Output Ripple Measurement
When measuring the output voltage or input voltage ripple, be sure to place the probe directly across an output or input capacitor. Figure 2 shows one example. Leads are soldered to both sides of the capacitor. The probe's ground ring makes contact with the return lead and the probe tip makes contact with the other lead.
NOTE: FOR ACCURATE EFFICIENCY MEASUREMENTS, MONITOR VOUT ACROSS COUT11
Figure 1. Proper Measurement Setup of the DC2615A
2
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QUICK START PROCEDURE
DEMO MANUAL DC2615A
EFFICIENCY (%) EFFICIENCY (%)
+
COUT
VOUT
GND
Figure 2. Measurement Output Voltage Ripple
100
95
90
85
80
75
70
VIN = 3.3V
VIN = 5V
65
VIN = 12V
VIN = 20V
60
0
2
4
6
8
10
12
14
16
LOAD CURRENT (A)
DC2615a F03
fSW: 1MHz L: WURTH 744308020 (200nH, 0.37m TYP)
Figure 3. Efficiency of the 1.2V/15A Regulator in CCM
100 90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
LOAD CURRENT (A)
fSW: 1MHz L: WURTH 744308020 (200nH, 0.37m TYP)
DCM CCM
100
DC2615a F04
Figure 4. Efficiency of the 1.2V/15A Regulator in CCM and DCM, VIN = 5V
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DC2615a F05
Figure 5. Thermal Image of the 1.2V/15A Regulator, VIN = 12V, fSW = 1MHz, L = Wurth 744308020 (200nH, 0.37m Typ) 24°C Ambient, No Airflow
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DEMO MANUAL DC2615A QUICK START PROCEDURE
VSW 5V/DIV
VO(AC) 20mV/DIV
LOAD STEP 10A/DIV
15A 5A
50µs/DIV
(a) Load Step Pulse
DC2615a F06a
VSW 5V/DIV
VO(AC) 20mV/DIV
LOAD STEP 10A/DIV
15A 5A
2µs/DIV
(b) Rising Edge of Load Step
DC2615a F06b
COUT = 2x Panasonic EEFSX0E331ER (330µF, 2.5V, 9m) || (100µF, 6.3V, X5R, 1206), L = Wurth 744308020 (200nH, 0.37m Typ), fSW = 1MHz
Figure 6. 5A to 15A Load Step, VIN = 5V. The Controlled On-Time Valley Current Mode Architecture of the LTC7151S Allows the Switch Node Pulses to Compress During the 5A to 15A Load Step Transition. Approximately 1µs After the Start of the Rising Edge, the Output Voltage Starts Its Recovery.
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PARTS LIST
ITEM QTY REFERENCE
Required Circuit Components
1
2 C1, C3
2
1 C4
3
1 C5
4
2 CIN1, CIN4
5
2 CIN2, CIN3
6
1 CIN5
7
1 CITH
8
1 CITHP
9
1 COUT1
10
2 COUT3, COUT4
11
1 L1
12
2 R1, R3
13
1 R2
14
1 R4
15
1 R7
16
1 R8
17
1 RFB1
18
1 RFB2
19
1 RITH
20
1 U1
Load Step Circuit
1
1 Q1
2
1 R10
3
1 R9
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DEMO MANUAL DC2615A
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP, 0.1µF, X5R, 25V, 10%, 0603 CAP, 4.7µF, X5R, 6.3V, 10%, 0603
CAP, 4.7µF, X5R, 6.3V, 10%, 0805 CAP, 10µF, X5R, 25V, 10%, 1206
CAP, 4.7µF, X5R, 25V, 10%, 0805
CAP, 180µF, OS-CON, 25V, 20%, 8mm × 12mm SMD, E12 CAP, 220pF, C0G, 50V, 5%, 0603 CAP, 10pF, C0G, 25V, 5%, 0603 CAP, 100µF, X5R, 6.3V, 20%,1206
CAP, 330µF, SP-CAP, 2.5V, 20%, 9m, 6.3A, 7343 IND, 0.2µH, HIGH CURRENT, 20%, 25A, SMD 1070 RES,100k, 1%, 1/10W, 0603
RES, 162k, 1%, 1/10W, 0603, AEC-Q200
RES, 1, 5%, 1/10W, 0603, AEC-Q200 RES, 0, 1/10W, 0603
RES, 10, 5%, 1/10W, 0603
RES, 14k, 1%, 1/10W, 0603, AEC-Q200 RES, 10k, 1%, 1/10W, 0603, AEC-Q200
RES, 40.2k, 1%, 1/10W, 0603, AEC-Q200
IC, SYNCHRONOUS BUCK CONVERTER, LGA-28 (5mm × 4mm), 20V, 14A
AVX, 06033D104KAT2A
AVX, 06036D475KAT2A MURATA, GRM188R60J475KE19D TDK, C1608X5R0J475K080AB
AVX, 08056D475KAT2A
AVX, 12063D106KAT2A MURATA, GRM31CR61E106KA12L TDK, C3216X5R1E106K160AB
MURATA, GRM219R61E475KA73D TDK, C2012X5R1E475K085AC
PANASONIC, 25SVPF180M
AVX, 06035A221JAT2A
AVX, 06033A100JAT2A
MURATA, GRM31CR60J107ME39L TDK, C3216X5R0J107M160AB
PANASONIC, EEFSX0E331ER
WURTH ELEKTRONIK, 744308020
NIC, NRC06F1003TRF PANASONIC, ERJ3EKF1003V VISHAY, CRCW0603100KFKEA
PANASONIC, ERJ3EKF1623V ROHM, MCR03EZPFX1623 VISHAY, CRCW0603162KFKEA
VISHAY, CRCW06031R00JNEA
NIC, NRC06ZOTRF VISHAY, CRCW06030000Z0EA
NIC, NRC06J100TRF VISHAY, CRCW060310R0JNEA
VISHAY, CRCW060314K0FKEA
KOA SPEER, RK73H1JTTD1002F PANASONIC, ERJ3EKF1002V VISHAY, CRCW060310K0FKEA
NIC, NRC06F4022TRF PANASONIC, ERJ3EKF4022V VISHAY, CRCW060340K2FKEA
ANALOG DEVICES, LTC7151SEV#PBF
XSTR, MOSFET, N-CH, 40V, TO-252 (DPAK) RES, 0.01, 1%, 1W, 2512, SENSE, AEC-Q200 RES, 10k, 1%, 1/10W, 0603, AEC-Q200
VISHAY, SUD50N04-8M8P-4GE3
VISHAY, WSL2512R0100FEA
KOA SPEER, RK73H1JTTD1002F PANASONIC, ERJ3EKF1002V VISHAY, CRCW060310K0FKEA
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DEMO MANUAL DC2615A
PARTS LIST
ITEM QTY REFERENCE
Additional Demo Board Circuit Components
1
0 COUT2, COUT8, COUT9
2
0 COUT5, COUT6
3
0 C7, CPL
4
0 R5, R6, R11
Hardware: For Demo Board Only
1
13 E1, E2, E3, E4, E5, E6, E7, E8,
E9, E10, E11, E12, E13"
2
4 J1, J2, J3, J4
3
3 JP1, JP2, JP3
4
2 JP1, JP3
5
1 JP2
6
4 MH1, MH2, MH3, MH4
PART DESCRIPTION
CAP, OPTION, 1206 CAP, OPTION, 7343 CAP, OPTION, 0603 RES, OPTION, 0603
TEST POINT, TURRET, 0.094", MTG. HOLE
CONN, BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE CONN, SHUNT, FEMALE, 2 POS, 2mm CONN, HDR, MALE, 1×3, 2mm, VERT, STR, THT CONN, HDR, MALE, 2×2, 2mm, VERT, STR, THT STANDOFF, NYLON, SNAP-ON, 0.50"
MANUFACTURER/PART NUMBER
MILL-MAX, 2501-2-00-80-00-00-07-0 KEYSTONE, 575-4 WURTH ELEKTRONIK, 60800213421 WURTH ELEKTRONIK, 62000311121 WURTH ELEKTRONIK, 62000421121 WURTH ELEKTRONIK, 702935000
6
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SCHEMATIC DIAGRAM
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
1
TRACK
E1 INTVCC
PGOOD E2
R1 100K
CLKOUT E3
SVIN
C1 0.1uF
Fswitch: 1MHz R2 162K
U1
PHMD
LTC7151SEV
RITH 40.2K
CITH 220pF
CITHP 10pF
CPL OPT
RFB1 14.0K
2
ECO REV
__
2
REVISION HISTORY
DESCRIPTION
APPROVED
PRODUCTION
MIKE S.
DATE 5-7-18
PHMODE 28 RT 27
PGOOD 26 TRACK/SS 25
ITH 24 FB 23
1
RUN JP1
R3 100K
32 GND
GND 31
RFB2 10K
A
3
ON 2
OFF
R11
OPT
R4 1 SVIN
C3
1 CLKOUT 2 RUN 3 SVIN
VOUTM 22 M/S 21
INTVCC 20
M/S C4
VOUTM INTVCC
A
VIN
E4
J1
VIN
VIN
0.1uF
4 PVIN 5 PVIN
PVIN 19 PVIN 18
4.7uF VIN
R7 R8
3.1V - 20V
CIN1 CIN2
6 GND
GND 17
CIN3
CIN4
0 10
+ CIN5 180uF
25V
INTVCC
10uF 4.7uF 1206 0805
7 GND 8 GND
GND 16 GND 15
4.7uF 0805
10uF 1206
E5 VOS+
J2
R5
GND
OPT PHMD
29 GND
NC NC NC NC
30 GND
E6 VOS-
14 SW
13 SW
12 SW
11 SW
10 SW
9 SW
33 34 35 36
GND E7 R6
GND E11
OPT
GND E13
JP2
M/S
SYNC
CCM/SYNC 2
1
E8
DCM 4
3
L1 0.2uH 744308020
VOUTM
COUT1 100uF 1206
VOUT
COUT3 + COUT4
330uF 2.5V
J3 VOUT 1.2V 15A MAX
J4 GND
MODE
C7
OPT
VOUT
DEMO MANUAL DC2615A
OPT EMI FILTER
B
VIN EMI
L3
TP1
GND EMI TP2
C8 C9 C10 OPT 0805
C12 OPT C13 1812 OPT 1210
L2
C14
OPT
C15 xal7070
OPT
1210
VIN
C11 OPT 1210
1
LOAD STEP CIRCUIT
VOUT
COUT8 COUT9
OPT
OPT
1206
1206
SUD50N03-12P Q1
ISTEP+
E10 ISTEP-
E12
3
2
C5 4.7uF 16V 0805
1 E9
R9 10K
R10 0.01 2512
PULSEGEN
COUT2 OPT 1206
COUT5 + COUT6
OPT
B
CUSTOMER NOTICE
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
APPROVALS
PCB DES.
HZ
APP ENG.
MS
www.analog.com
Phone: (408)432-1900
TITLE: SCHEMATIC HIGH EFFICIENCY 15A SYNCHRONOUS BUCK REGULATOR
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
IC NO. LTC7151SEV SKU NO. DC2615A
SIZE: N/A DATE: 6-25-18
2
SCHEMATIC NO. AND REVISION:
DC2615A_REV02
SHEET 1 OF 1
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DEMO MANUAL DC2615A
ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the "Evaluation Board"), you are agreeing to be bound by the terms and conditions set forth below ("Agreement") unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you ("Customer") and Analog Devices, Inc. ("ADI"), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term "Third Party" includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED "AS IS" AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER'S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI'S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
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UG-1381 Rev 0
UG17036-0-02/19(0)
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ANALOG DEVICES, INC. 2019