Texas Instruments LP8731-Q1 Manuale utente

Using the LP8731-Q1 Evaluation Board

User's Guide

Literature Number: SNVU458

November 2014

Contents

1 Introduction......................................................................................................................... 3

2 Hardware Setup ................................................................................................................... 3

2.1 Jumper Settings .......................................................................................................... 3

2.2 Connect USB2ANY box to LP8731YZREVM......................................................................... 3

3 Board Layout and Bill of Materials ......................................................................................... 5

3.1 Bill of Materials for LP8731-Q1EVM................................................................................... 6

4 LP8731-Q1EVM PCB Layout and Layers ................................................................................. 7

5 Graphic User Interface (GUI).................................................................................................. 8

5.1 Overview .................................................................................................................. 8

5.2 PC Requirement.......................................................................................................... 8

5.3 Start-Up.................................................................................................................... 8

6 General Control and LDO Settings ......................................................................................... 9

6.1 USBAny Control.......................................................................................................... 9

6.2 GPIO Enable Control .................................................................................................... 9

6.3 General Control and LDO Settings .................................................................................... 9

6.4 System Control.......................................................................................................... 10

6.5 LDO Output Control .................................................................................................... 10

6.6 Buck Voltage & Ramp Rate Control.................................................................................. 10

6.7 Buck Function........................................................................................................... 11

6.8 Misc Page................................................................................................................ 12

2Table of Contents SNVU458–November 2014

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User's Guide

SNVU458–November 2014

LP8731-Q1 Evaluation Board

1 Introduction

The Texas Instrument LP8731YZREVM evaluation module (EVM) helps designers evaluate the operation

and performance of the LP8731-Q1 dual high current step down DC/DC and dual linear regulators with I2C

interface.

The EVM contains one LP8731-Q1 (see Table 1):

Table 1.

PART NUMBER PACKAGE BODY SIZE (MAX)

LP8731-Q1 DSBGA (25) 2.52 mm x 2.52 mm

2 Hardware Setup

This section describes the jumpers and connectors on the EVM as well as how to properly connect, set

up, and use the LP8731YZREVM. The LP8731YZREVM package should include: one LP8731YZREVM,

one USB2ANY box set.

As Figure 2 shows, the USB2ANY box set contains six (A-F) parts, and only three parts (A, B, C) are

required for LP8731YZREVM evaluation.

2.1 Jumper Settings

Place all the jumpers with dark red (power) and light blue (Enable) color mark as shown in Figure 1 .

2.2 Connect USB2ANY box to LP8731YZREVM

1. Connect USB cable (A) and one side of 30-pin ribbon cable (B) to USB2ANY box(C).

2. Connect another side of the 30-pin ribbon cable(B) to USB2ANY box(C) 30-pin connector.

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SNVU458–November 2014 LP8731-Q1 Evaluation Board

Hardware Setup

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Figure 1.

Figure 2.

4LP8731-Q1 Evaluation Board SNVU458–November 2014

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Board Layout and Bill of Materials

3 Board Layout and Bill of Materials

Figure 3. LP8731-Q1 Schematic

SNVU458–November 2014 LP8731-Q1 Evaluation Board

Board Layout and Bill of Materials

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3.1 Bill of Materials for LP8731-Q1EVM

ITEM DESIGNATOR QTY VALUE PART NUMBER MANUFACTURER DESCRIPTION

1 C1, C2, C7, C14 4 1 µF 08055C105KAT2A AVX CAP, CERM, 1 µF, 50 V, +/- 10%, X7R, 0805

2 C3, C4, C8, C9 4 10 µF C3216X7R1C106M TDK CAP, CERM, 10uF, 16V, +/-20%, X7R, 1206

3 C5, C6 2 0.47 µF C2012X7R1E474K TDK CAP, CERM, 0.47 µF, 25 V, +/- 10%, X7R, 0805

4 C10, C11 2 10 µF EMK212BB7106MG-T Taiyo Yuden CAP, CERM, 10 µF, 16 V, +/- 20%, X7R, 0805

Omron Electronic

5 J1 1 XG4C-3031 Connector, 15x2, 3A 300V STRT DIP, TH

Components

JP1, JP2, JP3, JP4,

6 8 5-146261-1 TE Connectivity Header, 100mil, 2x1, Gold plated, TH

JP5, JP6, JP7, JP8

JP9, JP10, JP12,

7 4 TSW-101-07-G-S Samtec Header, 100mil, 1pos, Gold, TH

JP18

JP13, JP14, JP15, Header, TH, 100mil, 1x3, Gold plated, 230 mil above

8 5 1 x 3 PBC03SAAN Sullins Connector Solutions

JP16, JP17 insulator

9 L2, L3 2 2.2 µH VLCF5020T-2R2N2R6-1 TDK Corporation INDUCTOR POWER 2.2UH 2.6A SMD

10 R1, R2 2 4.7 k CRCW08054K70JNEA Vishay-Dale RES, 4.7kΩ, 5%, 0.125W, 0805

11 R15 1 100 k CRCW0805100KFKEA Vishay-Dale RES, 100kΩ, 1%, 0.125W, 0805

SH-JP1, SH-JP2, SH-

JP3, SH-JP4, SH-JP5,

12 SH-JP6, SH-JP13, 11 1 x 2 2SN-BK-G Samtec Shunt, 2mm, Gold plated, Black

SH-JP14, SH-JP15,

SH-JP16, SH-JP17

TP1, TP2, TP3, TP4,

TP5, TP6, TP7, TP8,

TP9, TP10, TP11,

TP12, TP13, TP14,

13 TP15, TP16, TP17, 27 Double 1593-2 Keystone Terminal, Turret, TH, Double

TP18, TP19, TP20,

TP21, TP22, TP23,

TP24, TP25, TP26,

TP27

14 U1 1 LP8731Q1YZR TEXAS INSTRUMENTS Dual Step-Down DC/DC and Linear Reg

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LP8731-Q1EVM PCB Layout and Layers

4 LP8731-Q1EVM PCB Layout and Layers

Figure 4. Top Layer Figure 5. Mid-Layer 1

Figure 6. Mid-Layer 2 Figure 7. Bottom Layer

SNVU458–November 2014 LP8731-Q1 Evaluation Board

Graphic User Interface (GUI)

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5 Graphic User Interface (GUI)

5.1 Overview

Texas Instruments has created a graphic user interface (GUI) and USB2ANY box that can help exercise

the part in a simple way. This section descripts in detail of how to use the GUI to communicate with the

LP8731YZREVM.

5.2 PC Requirement

Windows 7, Microsoft .net framework 4.0

5.3 Start-Up

1. Complete the hardware setup following previous setup section.

2. Apply recommended voltage (see LP8731-Q1 data sheet (SNVSA28) for details) to LP8731YZREVM.

3. Launch the GUI by double clicking the Icon

4. The GUI then launches as picture shows below

NOTE: At the first time use, the USB2ANY firmware update message window pops up, please

simply follow the screen instruction to complete the update.

Figure 8.

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General Control and LDO Settings

6 General Control and LDO Settings

6.1 USBAny Control

Figure 9. USB2ANY Control

6.2 GPIO Enable Control

Figure 10.

NOTE: In order to have the control works correctly, please place the jumpers according to Section 2.

6.3 General Control and LDO Settings

Figure 11.

SNVU458–November 2014 LP8731-Q1 Evaluation Board

General Control and LDO Settings

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Individual enable register for each power rail, default are all enabled.

6.4 System Control

Figure 12.

Two dropdown boxes for selecting buck power operating mode PWM Only or Auto (note the default is

PWM mode) — please contact TI sales office if the auto/PFM mode is needed. The third dropdown box is

used for selecting power up/down sequence delay when EN_T control is used.

6.5 LDO Output Control

Figure 13.

Two slide bars are used to change the LDO outputs.

6.6 Buck Voltage & Ramp Rate Control

Figure 14.

These four drop-down boxes are used to select target voltage and ramp for both buck regulators, please

read the LP8731Q datasheet link for detail information. Read button is for updating/reading the latest

10 LP8731-Q1 Evaluation Board SNVU458–November 2014

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