ADP2443-EVALZ

ADP2443-EVALZ User Guide UG-1029 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 Evaluation Board for the ADP2443 3 A, 36 V, Synchronous, Step-Down Regulator FEATURES GENERAL DESCRIPTION Full featured evaluation board for the ADP2443 Compact solution size 4-layer high glass transition temperature (TG) printed circuit board (PCB) for superior thermal performance Convenient connections through vertical printed circuit tail pin headers Supply voltage 4.5 V to 36 V for PVIN Synchronization capable Independent enable control Power-good output The ADP2443-EVALZ evaluation board provides a complete and compact solution that allows users to evaluate all the performance of the ADP2443 with a near ideal PCB layout. The main device on the evaluation board, the ADP2443, is a synchronous step-down, dc-to-dc regulator with both high-side and low-side MOSFETs integrated to provide a high efficiency solution in a compact, 4 mm × 4 mm LFCSP package. The evaluation board has independent enable control, which allows flexible configuration when evaluating the ADP2443. Full details on the ADP2443 regulator are provided in the ADP2443 data sheet, available from Analog Devices, Inc. Consult the data sheet in conjunction with this user guide when working with this evaluation board. APPLICATIONS Full evaluation of the ADP2443 EVALUATION KIT CONTENTS ADP2443-EVALZ evaluation board DOCUMENT NEEDED ADP2443 data sheet EQUIPMENT NEEDED DC power supply Electronic load Oscilloscope 14831-001 EVALUATION BOARD PHOTOGRAPH Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 9 UG-1029 ADP2443-EVALZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Powering Up...................................................................................3 Applications ....................................................................................... 1 Measuring Evaluation Board Performance ...................................3 Evaluation Kit Contents ................................................................... 1 Modifying the Board.....................................................................4 Document Needed............................................................................ 1 Evaluation Board Schematic and Artwork.....................................6 Equipment Needed ........................................................................... 1 Schematic........................................................................................6 General Description ......................................................................... 1 PCB Layout ....................................................................................7 Evaluation Board Photograph......................................................... 1 Ordering Information .......................................................................8 Revision History ............................................................................... 2 Bill of Materials ..............................................................................8 Using the Evaluation Board............................................................. 3 REVISION HISTORY 9/2016—Revision 0: Initial Version Rev. 0 | Page 2 of 9 ADP2443-EVALZ User Guide UG-1029 USING THE EVALUATION BOARD POWERING UP Turning On the Evaluation Board The ADP2443-EVALZ evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. When the power source and load are connected to the evaluation board, it can be powered for operation. Jumper J6 (EN) 1. 2. 3. Perform the following steps to turn on the board: To enable the regulator, short the middle pin of J6 (EN) high. To disable the regulator, short the middle pin of J6 (EN) to GND. Input Power Source Set the input voltage to 24 V. Ensure that EN is high, and monitor the output voltage. Turn on the load, check that it is drawing the proper load current, and verify that the output voltage maintains its regulation. MEASURING EVALUATION BOARD PERFORMANCE If the input dc power source includes a current meter, use that meter to monitor the input current. Connect the positive terminal of the power source to J7 (PVIN) of the evaluation board, and the negative terminal of the power source to J14 (GND) of the evaluation board. Measuring the Switching Waveform If the dc power source does not include a current meter, connect a current meter in series with the input source voltage. Connect the positive lead (+) of the power source to the positive (+) ammeter terminal, the negative lead (−) of the power source to J14 (GND), and the negative lead (−) of the ammeter to J7 (PVIN). Output Load Before connecting the load, ensure that the regulator is turned off. Connect an electronic load or resistor for the regulator to set the load current. Connect the positive terminal of the load to J10 (VOUT) of the evaluation board and connect the negative terminal of the load to J13 (GND). Input and Output Voltmeter Measure the input and output voltages using voltmeters. Ensure that the voltmeters are connected to the appropriate terminals of evaluation board and not to the load or power source. If the voltmeters are not connected directly to the evaluation board, the measured voltages are incorrect due to the voltage drop across the leads and/or connections between the evaluation board, the power source, and/or the load. To measure the input voltage, connect the positive terminal of the voltmeter to J8 (PVIN_SNS) and the negative terminal to J12 (GND_SNS). Likewise, to measure the output voltage, connect the positive terminal of the voltmeter to J9 (VOUT_SNS) and the negative terminal to J15 (GND_SNS). To observe the switching waveform with an oscilloscope, place the oscilloscope probe tip at Test Point J11 (SW) with the probe ground at J5 (GND). Set the scope to dc with the appropriate voltage and time divisions. The switching waveform limits alternate approximately between 0 V and the input voltage. Measuring Load Regulation Test the load regulation by observing the change in the output voltage when increasing the output load current. To minimize the voltage drop, use short low resistance wires. Measuring Line Regulation Vary the input voltage and examine the change in the output voltage with the fixed output current. Line Transient Response Generate a step input voltage change and observe the behavior of the output voltage using an oscilloscope. Load Transient Response Generate a load current transient at the output and observe the output voltage response using an oscilloscope. Attach the current probe to the wire between the output and the load to capture the current transient waveform. Measuring Efficiency The efficiency, η, is measured by comparing the input power with the output power. η= VOUT × I OUT V IN × I IN Measure the input and output voltages as close as possible to the input and output capacitors to reduce the effect of voltage drop. Measuring Inductor Current Measure the inductor current by removing one end of the inductor from its pad and connecting a current loop in series. A current probe can be connected onto this wire. Rev. 0 | Page 3 of 9 UG-1029 ADP2443-EVALZ User Guide Measuring Output Voltage Ripple To observe the output voltage ripple, place the oscilloscope probe across the output capacitor with the probe ground lead connected to the negative (−) capacitor terminal and the probe tip placed at the positive (+) capacitor terminal. Set the oscilloscope to ac, 10 mV/division, 2 µs/division time base, and 20 MHz bandwidth. A standard oscilloscope probe has a long wire ground clip. For high frequency measurements, this ground clip picks up high frequency noise and injects it into the measured output ripple. Figure 2 shows an easy way to measure the output ripple properly. Remove the oscilloscope probe sheath and wrap an unshielded wire around the oscilloscope probe. By keeping the ground length of the oscilloscope probe as short as possible, the true ripple can be measured. MODIFYING THE BOARD To modify the ADP2443 evaluation board configuration, unsolder, replace, or remove the appropriate passive components or jumpers on the board. Changing the Output Voltages The output voltage of the ADP2443-EVALZ evaluation board is preset to 5 V and the output voltage can be changed by replacing the feedback resistors, R5 and R7, with the resistor values shown in Table 1. Table 1. Resistive Divider for Various Output Voltages R7, ±1% (kΩ) 10 10 15 20 47.5 10 22 R5, ±1% (kΩ) 15 10 10 10 15 2.21 3 The value of the top resistor, R7, is calculated using the following equation: V − 0. 6 V   R7 = R5 ×  OUT   0. 6 V   When the output voltage is changed, the values of the inductor (L1), the ramp resistor (R10), the output capacitors (C9, C10, and C11), and the compensation components (R6, C3, and C2) must be recalculated and changed to ensure stable operation (see the ADP2443 data sheet for details on external component selection). Changing the Switching Frequency The switching frequency (fSW) of the ADP2443-EVALZ evaluation board is preset to 600 kHz and the switching frequency setpoint can be changed by replacing the R4 resistor with a different value, as shown in the following equation: fSW (kHz) = 168,000/R4 (kΩ) A 560 kΩ resistor sets the frequency to 300 kHz, and a 280 kΩ resistor sets the frequency to 600 kHz. When the switching frequency is changed, the values of the inductor (L1), the ramp resistor (R10), the output capacitors (C9, C10, and C11), and the compensation networks (R6, C3, and C2) must be recalculated and changed for stable operation (see the ADP2443 data sheet for details on external component selection). Changing the Soft Start Time The soft start time of the ADP2443 on the evaluation board is programmed to 3.8 ms. To change the soft start time, tSS, replace the C1 capacitor value using the following equation: C1 (nF) = 5.83 × tSS (ms) 14831-002 VOUT (V) 1.0 1.2 1.5 1.8 2.5 3.3 5.0 To limit the output voltage accuracy degradation due to the FB pin bias current (0.1 µA maximum) to less than 0.5% (maximum), ensure that the bottom divider string resistor, R5, is less than 30 kΩ. Figure 2. Measuring Output Voltage Ripple Rev. 0 | Page 4 of 9 ADP2443-EVALZ User Guide UG-1029 External Synchronization To synchronize the regulator to an external clock signal, apply an external clock signal to J1 (SYNC/RT) of the evaluation board. The clock signal must have a logic high level from 1.3 V to 5 V and a logic low level below 0.4 V. Set the external clock pulse width to more than 100 ns and the frequency range between 200 kHz and 1.8 MHz. During synchronization, the regulator operates in CCM mode and the rising edge of the switching waveform runs 180° out of phase to the external clock rising edge. For reliable synchronization, connect a resistor (R4) from the RT/SYNC pin to GND to program the internal oscillator to run at 80% to 120% of the external synchronization clock signal. Rev. 0 | Page 5 of 9 UG-1029 ADP2443-EVALZ User Guide EVALUATION BOARD SCHEMATIC AND ARTWORK SCHEMATIC 1 U1 23 20 PVIN_SNS J12 21 1 GND_SNS J14 R3 NC R2 100k 1 2 3 ADP2443 RAMP BST SW1 SW2 SW3 SW4 E_SW EN C9 C10 C11 J9 VOUT_SNS R7 22k 1 1 R5 3k R6 37.4k PGND1 PGND2 PGND3 PGND4 PGND5 PGND6 EXP GND SS VOUT 1 J15 R8 NC C4 NC 2 1 J13 GND C2 3.3pF C3 2.7nF 8 9 10 11 12 13 1 C1 22nF R9 NC J10 GND_SNS RT/SYNC 25 4 J3 24 R4 280k 2 1 2 6.8uH 2 COMP EN L1 VREG FB 22 1 5 6 7 14 26 C12 NC C5 1uF 1 2 3 SW PGOOD GND J6 J11 C6 0.1uF NC R10 1.5M R1 NC PVIN1 PVIN2 PVIN3 PVIN4 15 47uF/16V 1 C8 16 17 18 19 47uF/16V PVIN J8 C7 10uF/50V 1 2 10uF/50V J7 PGOOD J2 1 J1 1 SYNC/RT J4 GND 1 J5 1 GND Figure 3. Evaluation Board Schematic for the ADP2443-EVALZ Rev. 0 | Page 6 of 9 14831-003 VREG ADP2443-EVALZ User Guide UG-1029 14831-004 14831-006 PCB LAYOUT 14831-005 14831-007 Figure 6. Layer 2, Ground Plane Figure 4. Layer 1, Component Side Figure 7. Layer 4, Bottom Side Figure 5. Layer 3, Power Plane Rev. 0 | Page 7 of 9 UG-1029 ADP2443-EVALZ User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. Bill of Materials for ADP2443-EVALZ Qty 1 1 1 2 1 1 2 2 1 1 4 1 1 1 1 1 1 1 Reference Designator C1 C2 C3 C4, C12 C5 C6 C7, C8 C9, C10 C11 L11 R1, R3, R8, R9 R2 R4 R5 R6 R7 R10 U1 10 J1, J2, J3, J4, J5, J8, J9, J11, J12, J15 4 J7, J10, J13, J14 1 J6 1 Description Capacitor, 22 nF, 16 V, 0603 Capacitor, 3.3 pF, 50 V, 0603 Capacitor, 2700 pF, 50 V, 0603 Optional capacitor, 0603 Capacitor, 1 µF, 16 V, 0603 Capacitor, 0.1 µF, 16 V, 0603 Capacitor,10 µF, 50 V, 1210 Capacitor,47 µF, 16 V, 1210 Optional capacitor, 1210 Inductor, FDVE1040, L = 6.8 µH, IRAT = 7.1 A, DCR = 18.4 mΩ Optional resistor, 0603 Resistor, 100 kΩ, 1%, 0603 Resistor, 280 kΩ, 1%, 0603 Resistor, 3 kΩ, 1%, 0603 Resistor,37.4 kΩ, 1%, 0603 Resistor, 22 kΩ, 1%, 0603 Resistor, 1.5 MΩ, 1%, 0603 36 V, 3 A, synchronous, step-down regulator, 24-lead, LFCSP, with exposed pad Test point, 2.54 mm pitch single inline (SIL) vertical PC tail pin header, 6.1 mm mating pin height, tin, single inline package (SIP1) Connector, 2.54 mm pitch SIL vertical PC tail pin header, 6.1 mm mating pin height, tin, 2-way, SIP2 Jumper, 0.1-inch header, 3-way, SIP3 IRAT is the saturation current of the inductor. DCR is the dc resistance of the inductor. Rev. 0 | Page 8 of 9 Part Number/Vendor GRM188R71C223KA01D/Murata GRM1885C1H3R3CZ01D/Murata GRM188R71H272KA01D/Murata Optional/Murata GRM188R61C105KA93D/Murata GRM188R71C104KA01D/Murata GRM32ER71H106KA12L/Murata GRM32ER61C476KE15K/Murata Optional/Murata FDVE1040-6R8M/Toko Optional/Vishay Dale CRCW0603100KFKEA/Vishay Dale CRCW0603280KFKEA/Vishay Dale CRCW06033K00FKEA/Vishay Dale CRCW060337K4FKEA/Vishay Dale CRCW060322K0FKEA/Vishay Dale CRCW06031M50FKEA/Vishay Dale ADP2443/Analog Devices, Inc. M20-9990245/Harwin M20-9990245/Harwin M20-9990346/Harwin ADP2443-EVALZ User Guide UG-1029 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. ©2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG14831-0-9/16(0) Rev. 0 | Page 9 of 9