Texas Instruments LP8863EVM User manual

SNVU558–February 2017

The LP8863EVM Evaluation Module

User's Guide

SNVU558–February 2017

The LP8863EVM Evaluation Module

This user’s guide describes the module used to evaluate characteristics, operation, and use of the

LP8863-Q1 automotive LED backlight driver. This document includes a schematic diagram, PCB layout,

and bill of materials (BOM).

Contents

1 Introduction ................................................................................................................... 2

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

2.1 Input/Output Connector/Header Descriptions................................................................... 4

2.2 LP8863EVM Setup ................................................................................................. 6

2.3 Installation Guide for GUI program (Windows 7-compatible) ................................................. 7

3 Quick Start-Up Procedure................................................................................................. 10

4 Additional Control Options ................................................................................................ 11

5 Instructions for Standalone Evaluation .................................................................................. 16

6 LP8863EVM Board Stackup.............................................................................................. 17

7 LP8863EVM Component Placement .................................................................................... 18

8 LP8863EVM Component List............................................................................................. 19

9 LP8863EVM Schematics.................................................................................................. 22

10 Using the LP8863EVM .................................................................................................... 24

10.1 Power up/down sequence........................................................................................ 24

10.2 Enable .............................................................................................................. 24

10.3 Setting Boost Switch Frequency ................................................................................ 24

10.4 Setting PWM Output Frequency................................................................................. 24

10.5 Setting the LED String Current.................................................................................. 25

10.6 LED String Configuration......................................................................................... 25

11 LED Load Board............................................................................................................ 25

Trademarks

Windows is a registered trademark of Microsoft Corporation.

All other trademarks are the property of their respective owners.

Introduction

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The LP8863EVM Evaluation Module

1 Introduction

TI's LP8863-Q1 evaluation module (EVM) helps designers evaluate the operation and performance of the

LP8863-Q1 automotive LED backlight driver. The device offers configurability and can be set up through

external resistor options for boost switching frequency, LED current, and PWM out frequency. Internal

The EVM contains one LP8863-Q1 LED driver with boost circuit and a Tiva Launchpad evaluation circuit

to provide control signals for LED driver.

Table 1.

LED DRIVER IC PACKAGE

U8 LP8863-Q1 HTSSOP

Figure 1. LP8863-Q1 Evaluation Board (Top View)

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Setup

SNVU558–February 2017

The LP8863EVM Evaluation Module

Figure 2. LP8863-Q1 Evaluation Board (Bottom View)

2 Setup

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

setup to use the LP8863EVM.

Default resistor values and jumper positions are set to:

• Boost SW frequency – 300 kHz (set by external resistor R59)

• Maximum LED current per string – 120 mA (set by external resistor R57)

• PWM input to control brightness (register control)

• PWM output frequency – 9.8 kHz (set by external resistor R58)

• I2C interface to communicate with LP8863-Q1 – base address 0x2C

• Charge pump for SW gate drive enabled

• J14 : Open to disconnect VDDIO input from VLDO out

• J17 : Open to use internal charge pump

• J19 : Close to connect onboard LDO outputs (1.8 V from Tiva controller circuit) to VDDIO

• J31 : Close to connect onboard LDO output (5 V) to VDD input to LP8863-Q1 measurement

• J12 : Open – probing point of boost output

• J16 : Open – a probing/noise injecting point for stability measurement

Setup

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System/equipment required:

• Power supplies for VIN : 24 V or higher, 6 A or higher

• Power supplies for VDD: 5.5 V or higher, 0.5 A or higher (only needed when external power supply is

used for VDD input. Not needed for default setting)

• Power cables for VIN, VDD connection – cables with banana plugs recommended

• LED load board (not included in package): 6 strings, 8 LEDs per string (LEDs per string can be

adjusted by moving jumpers on load board)

• LED cable: 7-position ribbon cable

• USB cable (USB A to mini)

• PC to run GUI software

• Windows®7 or previous version)

• GUI software

2.1 Input/Output Connector/Header Descriptions

J3 Input— This header is the power input (VDD) terminal and also probing header for LP8863-Q1 power.

The terminal provides a power connection to allow the user to attach the EVM to a power supply

and also monitor VDD connected to J4.

J4 - Input — This banana socket is the power input (VDD) terminal for LP8863-Q1 power. The terminal

provides a power (VDD) connection to allow the user to attach the EVM to a power supply.

J5 - Input— This banana socket is the power input (VBAT) terminal for the boost converter. The terminal

provides a power (VBAT) connection to allow the user to attach the EVM to a power supply.

J6 – GND— This banana socket is the power input (GND) terminal for the boost converter. The terminal

provides a power ground (GND) connection to allow the user to attach the EVM to a power supply.

J7 – Header— This header is a probing point of SW node.

J8 – GND— This banana socket is the power input (GND) terminal for the boost converter. The terminal

provides a power ground (GND) connection to allow the user to attach the EVM to a power supply.

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Setup

SNVU558–February 2017

The LP8863EVM Evaluation Module

J9 – Input— This header is the power input (VBAT) terminal and also probing header for the boost

converter. The terminal provides a power connection to allow the user to attach the EVM to a power

supply and also monitor VBAT connected to J5.

J10 – Header — This header is a probing point of VIN (boost input power after power filters).

J11 – Header— This header is a probing point of VINP (boost input power after power line FET).

J12 – Headers— These headers are probing points of boost output (VBOOST).

J13 – GND— This header is the power input (GND) terminal and also probing header for the boost

converter. The terminal provides power ground connection to allow the user to attach the EVM to a

power supply and also monitor VBAT connected to J8.

J14 – Jumper— This connector is for selection of the source of VDDIO between VDD and internal LDO

out (VLDO) of LP8863-Q1.

J15 – Input— This header is the power input (VDDIO) terminal and also probing header for VDDIO. The

terminal provides a power connection to allow the user to attach the EVM to a power supply and

also monitor VDDIO selected by J14.

J16 – Headers— These headers are probing/noise injecting points for stability measurement of boost.

J17 – Connector— This connector is to connect VDD to the internal charge pump output (when charge

pump is not used).

J18 – Header— This header is a probing point of GD.

J19 – Jumper— This connector is for selection of the source of VDDIO between 1.8-V and 3.3-V output

from on-board LDOs.

J20 – Connector— This connector is to connect 5-V output from on-board LDO to VDD input.

J21 to J26 – Headers— These headers are to measure LED string current of LED0 to LED5.

J27 – GND— These headers are probing points of GND.

J28 – Header— This header is a probing point of INT.

J31 – Connector— This connector is to connect 5-V output from on-board LDO to VDD input.

J32 – Headers— These headers are probing points of SDO_PWM, SDI_SDA, SCLK_SCL, and

SS_ADDRSEL.

J33 – Connector— This connector is to connect LED load board to EVM.

J34 – GND— These headers are probing points of GND.

Setup

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2.2 LP8863EVM Setup

External power must be provided to the board. Connect a standard type-A plug from the PC to a Mini-B

plug, which goes to the EVM connector. The I2C-compatible interface program provides all of the controls

that the LP8863-Q1 device requires.

Figure 3. LP8863EVM With LED Load Board Connected

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Setup

SNVU558–February 2017

The LP8863EVM Evaluation Module

2.3 Installation Guide for GUI program (Windows 7-compatible)

• Run “setup_LP8863_EVM_1.0.0.exe”.

• Click “Next” button on this setup screen.

Figure 4. LP8863_EVM_GUI Setup

• Check ”I accept the agreement” and press ”Next” button again.

Setup

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Figure 5. License Agreement

• Choose the folder name of GUI to be installed, then press ”Next” button or simply press ”Next” button.

Figure 6. Installation Directory

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Setup

SNVU558–February 2017

The LP8863EVM Evaluation Module

• Begin SW installation by pressing ”Install” button in next window.

• Once installation is completed, press ”Finish” to launch SW GUI of LP8863-Q1.

Figure 7. Completing the LP8863_EVM_GUI Setup Wizard

• Initial window of GUI. Prepare hardware connection after this window, as described in the following

sections.

Figure 8. LP8863_EVM_GUI Home Page

Quick Start-Up Procedure

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3 Quick Start-Up Procedure

• Connect USB cable between EVB and PC.

• Connect external power supply to VIN: 12 V (typical), 5-A setting, output not enabled yet.

• Run the LP8863 GUI software and click ”Control” icon on left of GUI, then control window appears

as in Figure 9.

Figure 9. GUI Control Window

• Check ”EVM connected” mark on bottom of GUI software.

• Press ”IFSEL Pin” button to select I2C interface: This is not required if register control is not used.

• Enable VIN power supply output: IIN is approximately a couple of mA at normal cases. If higher current

on either power rail is monitored, disable power supply output and begin debugging.

• Click ”Enable Pin” button on GUI software: boost converter starts working, and LEDs stay off without

PWM input.

• On PWM input control, check ”Enable” box of PWM input, select frequency and duty from drop-down

boxes, and press ”Update” button: LED turns on at adjusted brightness level by PWM input.

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