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Evaluation Board for ADP1864

with Web Design Tool

EVAL-ADP1864

Rev. C

Evaluation boards are only intended for device evalua

Evaluation boards are supplied “as is” and without warra

statutory including, but not limited to, any implied warra

particular purpose. No license is granted by implication or

intellectual property by application or use of evaluation bo

Devices is believed to be accurate and reliable. However, n

Devices for its use, nor for any infringements of patents or ot

from its use. Analog Devices reserves the right to change

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Evaluation boards are not authorized to be used in life suppor

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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

Fully populated ADP1864-EVALZ

Input voltage range: 9 V to 12 V

Output voltage: 3.3 V

Output current: 3 A

Bare board ADP1864-BL-EVALZ

Populated with only 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 V to 12 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.

EVALUATION BOARD PHOTO

5612-016

Figure 1. ADP1864-EVALZ

Summary of content (16 pages)

PAGE 1
Evaluation Board for ADP1864 with Web Design Tool EVAL-ADP1864 FEATURES 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
EVAL-ADP1864 TABLE OF CONTENTS Features .............................................................................................. 1 Enter Performance Specifications ...............................................8 Shipped Configuration .................................................................... 1 Select Component Values and Sizes ...........................................9 Evaluation Board Description.........................................................
PAGE 3
EVAL-ADP1864 POWERING THE EVALUATION BOARD The ADP1864 evaluation board is supplied fully assembled or, optionally, populated with only the ADP1864 IC. Before applying power to the evaluation board, refer to Figure 2 and follow the procedures in this section. ammeter terminal to the evaluation board VOUT terminal, the negative (−) ammeter terminal to the positive (+) load terminal, and the negative (−) load terminal to the evaluation board GND terminal just above the VOUT terminal.
PAGE 4
EVAL-ADP1864 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 ac-coupled, 100 mV/division, and 2 μs/division time base.
PAGE 5
EVAL-ADP1864 TYPICAL PERFORMANCE CHARACTERISTICS C3 DC1M 5.00V/div –5.00V ofst Timebase –1.32µs Trigger WStream 500ns Auto 12.5ks 2.5GSPS 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 2.5GSPS Edge 50.0ks 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 2.5GSPS Edge C4 DC 4.
PAGE 6
EVAL-ADP1864 IOUT VOUT IOUT C3 C2 VOUT DC C3 BWL AC1M 1.00A/div 100mV/div 0mA offset 0.0mV ofst Timebase –476µs Trigger 200µs Auto WStream 1.00MS 500MSPS Edge C2 DC 2.21A Positive C2 DC C3 DC1M 5.00A/div 5.00V/div –5.00A ofst –10.00V ofst Timebase –119µs Trigger WStream 50.0µs Stop 1.25MS 2.5GSPS Edge C2 DC 5.35A Positive 05612-011 C2 05612-008 C3 Figure 13. Short Circuit; VIN = 12 V Figure 10. Load Transient; 1.
PAGE 7
EVAL-ADP1864 1.0 0.9 3.289 VIN = 9V 0.8 OUTPUT VOLTAGE (V) 3.284 VIN = 12V 0.6 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 (A) 10 3.264 0 0.5 1.0 1.5 2.0 LOAD CURRENT (A) 2.5 Figure 17. Load Regulation Figure 16. Efficiency vs. Load Current Rev. C | Page 7 of 16 3.0 3.5 05612-015 0.1 05612-014 EFFICIENCY(%) 0.
PAGE 8
EVAL-ADP1864 05612-019 EXCEL DESIGN TOOL INTERFACE Figure 18. Excel Design 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 to 14 V.
PAGE 9
EVAL-ADP1864 As a general guideline, it is recommended to set this value around 5%. In the next pull-down menu (Ioutstep), the user can select the estimate of the largest step in load the regulator will demand. This, in conjunction with the allowable voltage excursion on load transient (in the Vout step error pull-down menu), delegates how much output capacitance is required.
PAGE 10
EVAL-ADP1864 MODIFYING THE EVALUATION BOARD The ADP1864-EVALZ 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 described in this section. CHANGING THE MOSFET The ADP1864-EVALZ evaluation board is supplied with a Siliconix Si5435 power MOSFET.
PAGE 11
EVAL-ADP1864 CHANGING THE OUTPUT VOLTAGE The ADP1864-EVALZ evaluation board output regulation voltage can be changed by altering the voltage divider consisting of RF2 and RF1. The output regulation voltage is determined by the following equation: Modifying the output voltage changes the inductor ripple current and subsequently the output voltage ripple, transient response, and stress on the PFET. The design tool considers this and, if necessary, provides new component values. ⎛ R + RF1 ⎞ ⎟⎟ VOUT = 0.
PAGE 12
EVAL-ADP1864 SCHEMATIC RIN1 LS VIN TP1 CIN1 C1 CIN4 CIN2 TP2 EN ADP1864 R1 1 RC COMP PGATE 6 2 GND VIN 5 3 CF2 RF2 Q1-2 Q1-3 Q1-4 TP6 RCL2 RCL3 RCL4 D1 CS 4 FB Q1-5 TP5 RCL1 RF1 L2 TP7 Q1-1 CC0 CS RS L1 VOUT COUT2 TP4 COUT1 TP3 05612-001 CC1 U1 Figure 19. ADP1864-EVALZ Evaluation Board Schematic Rev.
PAGE 13
EVAL-ADP1864 05612-020 1900mm ASSEMBLY DRAWING 1900mm 05612-021 Figure 20. ADP1864-EVALZ Evaluation Board Assembly Drawing, Front Figure 21. ADP1864-EVALZ Evaluation Board Assembly Drawing, Back Rev.
PAGE 14
EVAL-ADP1864 ORDERING INFORMATION BILL OF MATERIALS Table 1. ADP1864-EVALZ Qty. 1 Package 6-lead TSOT Area (mm2) 9 Manufacturer and Part Number Analog Devices ADP1864AUJZ-R7 Designator U1 Value Comments CC0 33 pF 1 0603 1.3 X7R or COG ceramic, 10% tolerance CC1 0.82 nF 1 0603 1.3 X7R or COG ceramic, 10% tolerance CIN1 10 μF 1 1210 8 TDK C3225X7R1C106M COUT1 100 μF 1 1210 8.0 TDK C3225X5R0J107M RC 27.4 kΩ 1 0603 1.3 RCL1, RCL2 0.033 Ω 2 0805 6.4 RF1 80.
PAGE 15
EVAL-ADP1864 NOTES Rev.