Evaluation Board User Guide UG-437 DC-to-DC Switching Converter

Evaluation Board User Guide UG-437  DC-to-DC Switching Converter
Evaluation Board User Guide
UG-437
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the ADP1614 650 kHz/1.3 MHz, 4 A, Step-Up, PWM,
DC-to-DC Switching Converter
FEATURES
The ADP1614 evaluation board operates in current mode, pulsewidth modulation (PWM) with up to 94% efficiency. The current
mode PWM architecture allows for excellent transient response,
easy noise filtering, and the use of small, cost-saving external
inductors and capacitors. Other key features include a 47 nF
soft start capacitor, undervoltage lockout (UVLO), thermal
shutdown (TSD), and jumper selected enable. The evaluation
board demonstrates the operation and performance of the
ADP1614.
2.5 V to 5.5 V input voltage range
650 kHz or 1.3 MHz fixed frequency options
Adjustable current limit up to 4 A
Output voltage
5 V for ADP1614-650-EVALZ
15 V for ADP1614-1.3-EVALZ
Jumper for enable/shutdown control
Components optimized for the indicated output voltages
This user guide includes I/O descriptions, setup instructions,
the schematic, and the PCB layout drawings for the ADP1614
step-up converter evaluation board.
GENERAL DESCRIPTION
The ADP1614 evaluation board is a complete step-up, dc-to-dc
switching converter application with components selected to allow
operation over the full range of input and load conditions for the
5 V (ADP1614-650-EVALZ) and 15 V (ADP1614-1.3-EVALZ)
output voltages. The boost switching frequency is fixed to either
650 kHz (ADP1614-650-EVALZ) or 1.3 MHz (ADP1614-1.3EVALZ). The evaluation boards can be adjusted for different
output voltages by changing the feedback resistors, R1 and R2.
To ensure stable operation, external components L1, RCL, COUT,
RCOMP, and CCOMP may also need to be recalculated and adjusted
when the output voltage is changed.
Complete specifications for the ADP1614 are available in the
ADP1614 data sheet and should be consulted in conjunction
with this document when using the evaluation board.
TYPICAL APPLICATION CIRCUIT
L1
ADP1614
VIN
8
VIN
3
EN
ON
OFF
D1
VOUT
SW 6
SW 7
CIN
R1
FB 2
CLRES
R2
COMP 1
GND GND EP
10 SS
RCL
CSS
4
5
11
RCOMP
CCOMP
Figure 1. Step-Up Regulator Configuration
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 8
COUT
10859-001
9
UG-437
Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Setup ............................................................................3
General Description ......................................................................... 1
Performance Evaluation ...............................................................3
Typical Application Circuit ............................................................. 1
Evaluation Board Schematic and Layout........................................4
Revision History ............................................................................... 2
Layout Guidelines..........................................................................4
Evaluation Board Hardware ............................................................ 3
Ordering Information .......................................................................5
Input/Output Connectors ........................................................... 3
Bill of Materials ..............................................................................5
REVISION HISTORY
7/12—Revision 0: Initial Version
Rev. 0 | Page 2 of 8
Evaluation Board User Guide
UG-437
EVALUATION BOARD HARDWARE
The ADP1614 evaluation board is fully assembled and tested.
The following sections describe the various connectors on the
board, the proper evaluation setup, and the testing capabilities
of the evaluation board.
INPUT/OUTPUT CONNECTORS
EVALUATION SETUP
To ensure proper operation of the ADP1614 evaluation board:
1.
2.
3.
EN Test Bus
The EN connector is used to enable/disable the converter via
the EN pin. Use one of the following methods to enable the
converter. Do not leave the EN pin floating.
If the feedback resistors, R1 and R2, are adjusted to change the
output voltage, recalculate the recommended values for the external
components (L1, RCL, COUT, RCOMP, and CCOMP) using the applications
information from the ADP1614 data sheet.
Use a jumper to connect the top two pins of the EN test
bus. This connects EN to VIN and enables the converter
(see Figure 2).
PLACE
JUMPER
HERE
PERFORMANCE EVALUATION
10859-002
•
4.
5.
Figure 2. Enabled Jumper Position
Use a jumper to connect the bottom two pins of the EN test
bus. This connects EN to GND and disables the converter
(see Figure 3).
PLACE
JUMPER
HERE
10859-003
•
Alternatively, connect a voltage between VIN and GND to the
center pin of the EN test bus for independent control of the
EN pin voltage (see Figure 4).
Line Regulation
The line regulation is observed and measured by monitoring
the output voltage (VOUT) while varying the input voltage (VIN).
The load regulation is observed and measured by monitoring the
output voltage (VOUT) while sweeping the applied load between
VOUT and GND. To minimize voltage drop, use short low
resistance wires, especially for heavy loads.
Efficiency
The efficiency, η, is measured by comparing the input power to
the output power
10859-004
CONNECT
EXTERNAL
DEVICE
HERE
The following sections discuss tests and the resulting oscilloscope
waveforms. Oscilloscope waveforms and typical performance
characteristics are provided in the ADP1614 data sheet.
Load Regulation
Figure 3. Disabled Jumper Position
•
Connect the input supply ground to GND.
Connect the positive input supply to VIN.
Connect the desired load between VOUT and GND. The
maximum continuous output current of the ADP1614 is
dependent upon the input and output voltage conditions.
Apply a voltage between 2.5 V and 5.5 V to the VIN test bus.
Move the jumper on the EN test bus to the enabled position.
Figure 4. EN Pin Direct Connection
η=
VIN Test Bus
The VIN test bus connects the positive input supply voltage to
the VIN pin. Connect the power supply to this bus and keep the
wires as short as possible to minimize the EMI transmission.
SW Test Point
The SW test point is for monitoring the switch node (SW pin)
behavior and switching frequency. Connect a BNC cable to this
test point to measure the ADP1614 switching frequency.
VOUT Test Bus
The output voltage at the VOUT test bus is set by the resistive
voltage divider network, R1 and R2. A load can be attached
from the VOUT test bus to the GND test bus.
GND Test Bus
The GND test bus is the power ground connection for the part
via the GND pin as well as the bypass capacitors. Connect ground
connections from external equipment to this bus.
VOUT × I OUT
VIN × I IN
Line Transient
The line transient performance is evaluated by generating a high
speed voltage transient on the input (VIN) and observing the
behavior of the evaluation board at the output (VOUT.)
Load Transient
The load transient performance is evaluated by generating a fast
current transient on the output (VOUT) and observing the
behavior of the evaluation board at the output (VOUT.)
Oscillator Frequency
The oscillator frequency can be measured by connecting an
oscilloscope to the SW pin.
Inductor Current
The inductor current is made accessible by removing one side
of the inductor from its pad and connecting a current loop in
series. Place an oscilloscope current probe on the loop to view
the current waveform.
Rev. 0 | Page 3 of 8
UG-437
Evaluation Board User Guide
EVALUATION BOARD SCHEMATIC AND LAYOUT
L1
SW
ADP1614
(U1)
ADP1614ACPZ-650-R7
ADP1614ACPZ-1.3-R7
D1
VIN
8
VIN
3
EN
9
CLRES
VOUT
SW 6
SW 7
EN
R1
CIN2
(C5)
CIN1
(C4)
RCL
(R4)
COUT1
(C7)
FB 2
COMP 1
10 SS
CSS
(C1)
GND
GND
EP
4
5
11
COUT2
(C8)
COUT9
(C9)
R2
RCOMP
(R3)
CCOMP1
(C3)
CCOMP2
(C2)
GND
10859-005
CIN3
(C6)
Figure 5. ADP1614 Boost Application Evaluation Board Schematic
LAYOUT GUIDELINES
For high efficiency, good regulation, and stability, a well-designed
PCB layout is required.
When designing PCBs, use the following guidelines:
•
•
•
10859-006
•
•
Figure 6. ADP1614 Boost Application Printed Circuit Board (PCB) Top Layer
•
•
•
•
10859-007
•
Figure 7. ADP1614 Boost Application PCB Bottom Layer
Rev. 0 | Page 4 of 8
Keep the low ESR input capacitor (CIN) close to the VIN and
GND pins. This minimizes noise injected into the part
from the board parasitic inductance.
Keep the high current path from CIN through the L1 inductor
to the SW and GND pins as short as possible.
Keep the high current path from the VIN pin through L1,
the rectifier (D1), and the output capacitor (COUT) as short
as possible.
Keep high current traces as short and as wide as possible.
Place the feedback resistors, R1 and R2, as close to the FB
pin as possible to prevent noise pickup. Connect the ground of
the feedback network directly to an AGND plane to make a
Kelvin connection to the GND pin.
Place the compensation components as close as possible to
the COMP pin. Connect the ground of the compensation
network directly to an AGND plane that makes a Kelvin
connection to the GND pin.
Avoid routing high impedance traces from the compensation
and feedback resistors near any node connected to SW or
near the inductor to prevent radiated noise injection.
Connect the soft start capacitor (CSS) as close to the device as
possible. Connect the ground of the soft start capacitor to an
AGND plane that makes a Kelvin connection to the GND pin.
Connect the current limit set resistor (RCL) as close as possible
to the device. Connect the ground of RCL to an AGND plane
that makes a Kelvin connection to the GND pin.
The PCB must be properly designed to conduct the heat away
from the package. This is achieved by adding thermal vias to
the PCB that provide a thermal path to the inner or bottom
layers. Place thermal vias on the PCB under the exposed
pad of the LFCSP and in the GND plane around the ADP1614
package to improve thermal performance of the application.
Evaluation Board User Guide
UG-437
ORDERING INFORMATION
BILL OF MATERIALS
Table 1. ADP1614-650-EVALZ (fSW = 650 kHz, VOUT = 5 V)
Qty
1
1
1
1
1
1
1
2
1
1
1
1
1
1
4
1
2
Reference
Designator
U1
L1
D1
C1
C2
C3
C4
C5, C6
C7, C8
C9
R1
R2
R3
R4
EN
SW
VIN, VOUT, GNDx2
Description
ADP1614 step-up converter with fSW = 650 kHz
Inductor, 4.7 µH, 4.3 A
Schottky rectifier, 30 V, 5 A
Soft start capacitor, 47000 pF, 50 V, 0805, ±10%
Compensation capacitor, 33 pF, 50 V, 0805, ±5%
Compensation capacitor, 22000 pF, 50 V, 0805, ±10%
Input capacitor, 10 µF, 16 V, 0805, ±10%
Input capacitors
Output capacitors, 10 µF, 25 V, 0805, ±10%
Output capacitor
Output voltage divider resistor, 30.9 kΩ, 0805, ±1%
Output voltage divider resistor, 10.0 kΩ, 0805, ±1%
Compensation resistor, 2 kΩ, 0805, ±1%
Current limit set resistor, 66.5 kΩ, 0805, ±1%
Headers, 0.100 in, single, straight, 3-pin
Headers, 0.100 in, single, straight, 1-pin
Test point loop connectors
Equivalent substitutions may be made for all resistors and capacitors.
Alternatively, PBC36SAAN can be purchased and cut as necessary.
Rev. 0 | Page 5 of 8
Manufacturer 1
Analog Devices, Inc.
Coilcraft
Toshiba
Kemet
Panasonic Electronic Components
TDK Corporation
Murata Electronics
Open
Murata Electronics
Open
Vishay Dale
Panasonic Electronic Components
Yageo
Vishay Dale
Sullins Connector Solutions
Sullins Connector Solutions
Aavid Thermalloy
Part Number
ADP1614ACPZ-650-R7
XAL5030-472MEB
CMS05(TE12L,Q,M)
C0805C473K5RACTU
ECJ-2VC1H330J
C2012X7R1H223K/0.60
GRM21BR61C106KE15L
GRM21BR61E106KA73L
CRCW080530K9FKEA
ERJ-6ENF1002V
9C08052A2001FKHFT
CRCW080566K5FKEA
PBC03SAAN 2
PBC01SAAN2
125800D00000G
UG-437
Evaluation Board User Guide
Table 2. ADP1614-1.3-EVALZ (fSW = 1.3 MHz, VOUT = 15 V)
Qty
1
1
1
1
1
1
1
2
1
1
1
1
1
1
4
1
2
Reference
Designator
U1
L1
D1
C1
C2
C3
C4
C5, C6
C7, C8
C9
R1
R2
R3
R4
EN
SW
VIN, VOUT, GNDx2
Description
ADP1614 step-up converter with fSW = 1.3 MHz
Inductor, 10 µH, 5A
Schottky rectifier, 30V, 5A
Soft start capacitor, 47000 pF, 50 V, 0805, ±10%
Compensation capacitor, 18 pF, 50V, 0805, ±5%
Compensation capacitor, 47000 pF, 50 V, 0805, ±10%
Input capacitor, 10 µF, 16 V, 0805, ±10%
Input capacitors
Output capacitors, 10 µF, 25 V, 0805, ±10%
Output capacitor
Output voltage divider resistor, 110.0 kΩ, 0805, ±1%
Output voltage divider resistor, 10.0 kΩ, 0805, ±1%
Compensation resistor, 1 kΩ, 0805, ±1%
Current limit set resistor, 60.4 kΩ, 0805, ±1%
Headers, 0.100 in, single, straight, 3-pin
Headers, 0.100 in, single, straight, 1-pin
Test point loop connectors
Equivalent substitutions may be made for all resistors and capacitors.
Alternatively, PBC36SAAN can be purchased and cut as necessary.
Rev. 0 | Page 6 of 8
Manufacturer 1
Analog Devices, Inc.
Coilcraft
Toshiba
Kemet
Yageo
Kemet
Murata Electronics
Open
Murata Electronics
Open
Panasonic, ECG
Panasonic, ECG
Vishay Dale
Yageo
Sullins Connector Solutions
Sullins Connector Solutions
Aavid Thermalloy
Part Number
ADP1614ACPZ-1.3-R7
XAL6060-103MEB
CMS05(TE12L,Q,M)
C0805C473K5RACTU
CC0805JRNPO9BN180
C0805C473K5RACTU
GRM21BR61C106KE15L
GRM21BR61E106KA73L
ERJ-6ENF1103V
ERJ-6ENF1002V
CRCW08051K00FKEA
RC0805FR-0760K4L
PBC03SAAN 2
PBC01SAAN2
125800D00000G
Evaluation Board User Guide
UG-437
NOTES
Rev. 0 | Page 7 of 8
UG-437
Evaluation Board User Guide
NOTES
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.
©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG10859-0-7/12(0)
Rev. 0 | Page 8 of 8
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