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ADP1864 Evaluation Board

with Web Design Tool

ADP1864-EVALZ

Rev. A

Evaluation boards are only intended for device evaluation and not for production purposes.

Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or

statutory including, but not limited to, any implied warranty of merchantability or fitness for a

particular purpose. No license is granted by implication or otherwise under any patents or other

intellectual property by application or use of evaluation boards. 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. Analog Devices reserves the right to change devices or specifications at any time

without notice. Trademarks and registered trademarks are the property of their respective owners.

Evaluation boards are not authorized to be used in life support devices or systems.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700 www.analog.com

FEATURES

Powerful companion design tool for quick design times

Input voltage range: 3.15 V to 14 V

Output voltage range: 0.8 V to V

Output Current: up to 10 A

Accommodating layout with multiple packages for diodes,

PFETs, input and output capacitors, and inductors

3 PFETs in parallel for high current applications

Programmable compensation for optimizing transient

performance

Programmable current limit with sense resistor(s)

Enable/shutdown logic

Switching frequency: 580 kHz

Kelvin connections for measuring input and output voltage

SHIPPED CONFIGURATION

Input voltage range: 9 V to 12 V

Output voltage: 3.3 V

Output current: 3 A

ADP1864 EVALUATION BOARD DESCRIPTION

The ADP1864 evaluation board is designed to be used with the

ADP1864 Buck Design Software. The evaluation board is con-

figured to provide 3.3 V output at 3 A over an input voltage range

of 9.0 V to 12.0 V. Through a versatile layout that accommodates

several packages and a powerful companion design tool, the

ADP1864 evaluation board can provide a wide variety of solutions,

including up to a 5.0 V output at 10 A from a 12 V input. Kelvin

connection terminals provide an accurate means for measuring

the input and output voltages.

The evaluation board is designed to use the

ADP1864 as an

asynchronous, step-down dc-to-dc converter that uses a

current-mode pulse-width modulation control scheme. The

ADP1864 drives a P-channel MOSFET that regulates an output

voltage as low as 0.8 V with ±1.25% accuracy (up to 85°C), for

up to 10 A load currents, from input voltages as high as 14 V.

The

ADP1864 provides system flexibility by allowing accurate

setting of the current limit with an external resistor, while the

output voltage is easily adjustable using two external resistors.

For more details, see the

ADP1864 data sheet.

5612-016

Figure 1. ADP1864 Evaluation Board

Summary of content (12 pages)

PAGE 1
ADP1864 Evaluation Board with Web Design Tool ADP1864-EVALZ FEATURES ADP1864 EVALUATION BOARD DESCRIPTION Powerful companion design tool for quick design times Input voltage range: 3.15 V to 14 V Output voltage range: 0.
PAGE 2
ADP1864-EVALZ TABLE OF CONTENTS Features .............................................................................................. 1 Enter Performance Specifications ...............................................8 Shipped Configuration .................................................................... 1 Select Component Values and Sizes ...........................................9 ADP1864 Evaluation Board Description ...................................... 1 Power Dissipation and Temperature ...
PAGE 3
ADP1864-EVALZ POWERING THE EVALUATION BOARD The ADP1864 evaluation board is supplied fully assembled. Before applying power to the evaluation board, refer to Figure 2 and follow the procedures in this section. INPUT POWER SOURCE Before connecting the power source to the ADP1864 evaluation board, make sure that it is turned off. If the input power source includes a current meter, use that meter to monitor the input current.
PAGE 4
ADP1864-EVALZ MEASURING THE PERFORMANCE OF THE EVALUATION BOARD MEASURING OUTPUT VOLTAGE RIPPLE MEASURING THE INDUCTOR CURRENT To observe the output voltage ripple, place an oscilloscope across the output capacitor (COUT) with the probe ground lead at the negative (−) capacitor terminal and the probe tip at the positive (+) capacitor terminal. Set the oscilloscope to accoupled, 100 mV/division, and 2 μs/division time base.
PAGE 5
ADP1864-EVALZ TYPICAL PERFORMANCE CHARACTERISTICS C3 DC1M 5.00V/div –5.00V ofst Timebase –1.32µs Trigger WStream 500ns Auto 12.5ks 2.5GS/s Edge C4 DC 3.05V Positive C3 BWL AC1M 50.0mV/div 0.0mV ofst Figure 4. Switch Node Ringing at 3 A Load; VIN = 9 V Timebase –4.76µs Trigger WStream 2.00ns Auto 50.0ks 2.5GS/s Edge C4 DC 4.55V Positive 05612-005 C4 05612-002 C4 Figure 7. VOUT Ripple at 3 A Load; VIN = 12 V C4 Timebase –1.19µs Trigger WStream 500ns Auto 12.5ks 2.5GS/s Edge C4 DC 4.
PAGE 6
ADP1864-EVALZ IOUT VOUT IOUT C3 C2 VOUT DC C3 BWL AC1M 1.00A/div 100mV/div 0mA offset 0.0mV ofst Timebase –476µs Trigger WStream 200µs Auto 1.00MS 500MS/s Edge C2 DC 2.21A Positive C2 DC C3 DC1M 5.00A/div 5.00V/div –5.00A ofst –10.00V ofst Figure 10. Load Transient; 1.5 A to 3 A at 250 mA/μs, VIN = 9 V Timebase –119µs Trigger WStream 50.0µs Stop 1.25MS 2.5GS/s Edge C2 DC 5.35A Positive 05612-011 C2 05612-008 C3 Figure 13.
PAGE 7
ADP1864-EVALZ 1.0 3.289 0.9 VIN = 9V 0.8 3.284 OUTPUT VOLTAGE (V) 0.7 VIN = 12V 0.5 0.4 0.3 3.279 VIN = 9V 3.274 VIN = 12V 3.269 0.2 0 0.01 0.1 1 LOAD CURRENT 10 3.264 0 0.5 1.0 1.5 2.0 LOAD CURRENT (A) 2.5 Figure 17. Load Regulation Figure 16. Efficiency Rev. A | Page 7 of 12 3.0 3.5 05612-015 0.1 05612-014 (%) 0.
PAGE 8
ADP1864-EVALZ 05612-019 WEB TOOL INTERFACE Figure 18. Web Tool Interface ENTER PERFORMANCE SPECIFICATIONS In this section, the user can provide the specifications on how the power supply being designed needs to perform. The voltage range for the first two pull-down menus (Vinmin and Vinmax) is 3.15 V − 14 V. In the third pull-down menu, the user provides the required regulated output voltage (Vout), which needs to be less than Vinmin and Vinmax, because this tool is to be used with the buck topology.
PAGE 9
ADP1864-EVALZ components are sized. As a general guideline, it is recommended to set this value around 5%. The Ioutstep specification asks the user to estimate the largest step in load the regulator will demand. This in conjunction with the allowable voltage excursion on load transient (Vstep error) delegates how much output capacitance is required.
PAGE 10
ADP1864-EVALZ MODIFYING THE EVALUATION BOARD The ADP1864 evaluation board is complete and tested for operation. Due to the versatility of the ADP1864 step-down dc-to-dc controller, the ADP1864 evaluation board can be modified for a variety of external components. Some of the most common modifications are listed in this section. CHANGING THE MOSFET The ADP1864 evaluation board is supplied with a Siliconix Si5435 power MOSFET.
PAGE 11
ADP1864-EVALZ SCHEMATIC LS VIN CIN1 C1 CIN2 EN CC1 1 COMP PGATE 6 2 GND Q1-1 CC0 RCL-1 3 RF1 RF2 Q1-2 Q1-3 L1 IN 5 RCL-2 RCL-3 CS COUT1 D1 CS 4 FB VOUT RCL-4 COUT2 RS 05612-001 RC ADP1864 R1 U1 Figure 19. ADP1864 Evaluation Board Schematic Rev.
PAGE 12
ADP1864-EVALZ ORDERING INFORMATION BILL OF MATERIALS Table 1. Designator Controller IC Value Qty. 1 L1 3.3 μH, 15 mΩ 1 LS Not used 1 Area (mm2) 9 Manufacturer and Part Number Analog Devices ADP1864AUJZ-R7 Drum 124 Coilcraft DO3316P-332ML None 0 Package TSOT-6 Comments Shorted RCL-1 0.033 Ω 2 805 6.4 Susumu RL1220T-R033-J D1 10 A, 40 V 1 DI-5 27 Diodes, Inc. PDS1040L Q1-1 0.