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Evaluation Board User Guide

UG-310

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluation Board for the ADP2323, Dual 3 A, 20 V, Synchronous Step-Down

Regulator with Integrated High-Side MOSFET

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

FEATURES

Input voltage: 4.5 V to 20 V

±1% output voltage accuracy

Integrated 90 mΩ typical on-resistance high-side MOSFET

Flexible output configuration

Dual output: 3 A/3 A

Parallel single output: 6 A

Programmable switching frequency: 250 kHz to 1.2 MHz

External synchronization input with programmable phase

shift, or internal clock output

Selectable PWM or PFM mode operation

Adjustable current limit for small inductor

External compensation and soft start

Startup into precharged output

GENERAL DESCRIPTION

The ADP2323 evaluation board is a complete, dual, 3 A step-down

regulator solution that allows users to evaluate the performance of

the ADP2323 with a near ideal printed circuit board (PCB) layout.

The two pulse-width modulation (PWM) channels can be

configured to deliver dual, 3 A outputs or a parallel-to-single, 6 A

output. The switching frequency can be programmed between

250 kHz and 1.2 MHz, or it can be synchronized to an external

clock with a programmed 60°, 90°, or 120° phase shift, which

provides the possibility for a stackable multiphase power solution.

The outputs of the ADP2323 evaluation board are preset to 1.2 V

and 3.3 V for Channel 1 and Channel 2, respectively. With the

PWM mode selected, the switching frequency is set to 500 kHz.

Different output voltage settings and configurations can be

achieved by changing appropriate passive components or

jumper settings. The ambient temperature operating range is

−40°C to +85°C.

Full details on the ADP2323 dual regulator are provided in the

ADP2323 data sheet, available from Analog Devices, Inc., which

should be consulted in conjunction with this user guide.

ADP2323 DEMO BOARD

10113-001

Figure 1.

Summary of content (12 pages)

PAGE 1
Evaluation Board User Guide UG-310 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 ADP2323, Dual 3 A, 20 V, Synchronous Step-Down Regulator with Integrated High-Side MOSFET FEATURES GENERAL DESCRIPTION Input voltage: 4.
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UG-310 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Modifying the Board.....................................................................4 General Description ......................................................................... 1 Evaluation Board Schematic and Artwork.....................................6 ADP2323 Demo Board .................................................................
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Evaluation Board User Guide UG-310 USING THE EVALUATION BOARD POWERING UP The ADP2323 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. Jumper J31/Jumper J32 (Enable) Jumper J31 is used to control Channel 1. Use one of the following methods to enable or to disable Channel 1: • • To enable Channel 1, short the middle pin of J31, EN1, to high or leave it open.
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UG-310 Evaluation Board User Guide Turning On the Evaluation Board Measuring Output Voltage Ripple When the power source and load are connected to the evaluation board, it can be powered for operation. 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.
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Evaluation Board User Guide UG-310 The top resistor, R4 (R18 for Channel 2), value is calculated using the following equations: For Channel 1, ⎛V − 0.6 V ⎞ ⎟ R4 = R7 × ⎜ OUT1 ⎜ ⎟ 0.6 V ⎝ ⎠ For Channel 2, Changing the Soft Start Time The soft start time of the ADP2323 on the evaluation board is programmed to 1.7 ms. To change the soft start time, tSS, replace the C6 capacitor for Channel 1 (C21 for Channel 2) with a different capacitor value using the following equation: For Channel 1, ⎛V − 0.
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Figure 3. Evaluation Board Schematic for ADP2323 1 J32 EN2 J28 GND 3 2 1 J22 TRK2 1 3 2 1 J19 MODE J25 GND 3 2 1 1 J15 INTVCC 3 2 1 J7 SCFG 1 3 2 1 J4 TRK1 J13 SYNC 3 2 1 J31 EN1 J29 GND J26 GND 1 1 R3 NC C12 1uF R13 120k R17 2.
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Evaluation Board User Guide UG-310 10113-020 PCB LAYOUT Figure 4. Layer 1, Component Side Rev.
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Evaluation Board User Guide 10113-021 UG-310 Figure 5. Layer 2, Ground Plane Rev.
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UG-310 10113-022 Evaluation Board User Guide Figure 6. Layer 3, Power Plane Rev.
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Evaluation Board User Guide 10113-023 UG-310 Figure 7. Layer 4, Bottom Side Rev.
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Evaluation Board User Guide UG-310 ORDERING INFORMATION BILL OF MATERIALS Table 4.
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UG-310 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.