Texas Instruments LP8863EVM User manual

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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 www.ti.com
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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
register options enable various controls such as brightness inputs, slope control, dimming options, etc.
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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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

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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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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.

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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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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.

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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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• 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 www.ti.com
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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.

www.ti.com Additional Control Options
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4 Additional Control Options
• If external boost frequency sync is needed, check “Enable” box of BST SYNC, select frequency and
duty from drop-down boxes, and press ”Update” button:
• Remove pullup and/or pulldown resistors on EVM to avoid voltage division by these resistors when
external boost sync signal is used.
• LED driver headroom voltage can be controlled by led_driver_headroom. Use drop-down box to select
desired headroom voltage.

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• Other control options such as dither, slope control, dimming mode,and temperature sensor are
available by User Config.
• If temp_mon_en is set, die temperature can be read by window below:
• If brightness mode is selected to use brightness register as a brightness input, not PWM input signal,
base brightness can be controlled by window below.
• Control windows below can be used for independent dimming where each LED string is controlled
independently. See the LP8863-Q1 data sheet for independent dimming control.

www.ti.com Additional Control Options
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• All register values on control window can be manually updated to reflect latest values by pressing
“Update All” button.
• If additional register controls or direct register controls are needed, each register can be accessed
directly by input window below.
• Firmware version of the Tiva Launchpad is shown here and the latest version is 1.0.6.
• Individually programmed register values can be saved or loaded by file menu on top of the GUI.

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• Register file is *.txt format and can be renamed in the GUI or with a file managing program such as
Windows Explorer.
• Settings saved can be opened and programmed automatically by selecting “Load Registers” from file
menu.
• Register tab can be selected by pressing icon on left side of GUI.
• Initially, all register values are hidden as below.

www.ti.com Additional Control Options
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• All register values appear if cell for “LP8863 Registers” is pressed.
• Press “Read All” to update all register values with current values.
• “Read” button is used to read only selected register on “Register name” column to reduce read time.
• Each register bit can be changed by double click each bit cell.

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• Changed bit values by double click can be written immediately by selecting “Immediate” mode.
• If Update Mode is “Deferred”, bit value change by double click can be written only when “Write” button
is clicked.
• “Save” and “Load” functions are also supported on “Register” window.
• Field View shows register bit name, type, and values:
5 Instructions for Standalone Evaluation
The LP8863EVM can be used for standalone evaluation (without evaluation software and PC connection).
These are minimum requirements to use LP8863EVM as a standalone mode:
• 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 (if external power supply is used)
• Power cables for VIN (and/or VDD) connection – TI recommends cables with banana plugs
• LED load board (not included in package, order number EVMSVA-E99-B-250) – 6 strings, 8 LEDs per
string (LEDs per string can be adjusted by moving jumpers on load board
• LED cable – 7-position ribbon cable

www.ti.com LP8863EVM Board Stackup
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The LP8863EVM must be modified to support standalone mode from its default settings described as
follows:
1. Remove jumper on J19.
2. Connect pin 3 and 4 of J14 to connect VLDO output from LP8863-Q1 to VDDIO input.
3. Mount R68 to pull up PWM input for 100% brightness. If brightness needs to be changed from 100%,
connect external PWM source here (SDO_PWM).
4. Mount R63 to select I2C interface, so PWM input pin is not assigned to SDO of SPI interface.
5. Mount R64 to pull up EN input.
6. Change pullup and pulldown resistors to select spread spectrum enable (R66) or disable (R71) option.
The minimum procedures for turning on the LEDs after modifications above are as follows:
• Connect external power (VBAT, 3 V to 48 V; typical 12 V, 6 A) and ground to the board (recommended
boost conversion ratio less than 10).
• Connect LED load board (6 strings, 8 LEDs per string) to J33 (use caution about the boost output pin
location).
• Enable external power supply.
6 LP8863EVM Board Stackup
Figure 10. LP8863EVM Board Stackup

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7 LP8863EVM Component Placement
Figure 11. LP8863EVM Component Placement (Top Layer)
Figure 12. LP8863EVM Component Placement (Bottom Layer)

www.ti.com LP8863EVM Component List
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8 LP8863EVM Component List
DESIGNATOR QTY VALU
EDESCRIPTION FOOTPRINT PART NUMBER
PCB1 1 Printed Circuit Board LP8863EVM
C1, C8, C18, C20,
C21, C22 6 1uF CAP, CERM, 1 µF, 16 V, +/- 10%, X6S, 0402 402 C1005X6S1C105K050BC
C2, C4, C6 3 0.01uF CAP, CERM, 0.01uF, 25V, +/-10%, X7R, 0402 402 C1005X7R1E103K
C3, C5, C7, C9, C10,
C11, C12, C13 8 0.1uF CAP, CERM, 0.1 µF, 50 V, +/- 10%, X7R, 0402 402 C1005X7R1H104K050BB
C14, C15 2 10pF CAP, CERM, 10pF, 50V, +/-5%, C0G/NP0, 0402 402 500R07S100JV4T
C16 1 10uF CAP, CERM, 10 µF, 16 V, +/- 20%, X5R, 0603 0603L EMK107BBJ106MA-T
C17, C19 2 10pF CAP, CERM, 10 pF, 50 V, +/- 5%, C0G/NP0, 0603 0603L 06035A100JAT2A
C23, C24, C25, C26,
C27, C28, C29, C30,
C52, C56, C58, C60
12 0.1uF CAP, CERM, 0.1uF, 16V, +/-10%, X7R, 0402 402 GRM155R71C104KA88D
C31 1 220pF CAP, CERM, 220 pF, 100 V, +/- 10%, X7R, 0603 603 06031C221KAT2A
C32, C37, C42, C67,
C68 5 1000p FCAP, CERM, 1000pF, 100V, +/-5%, C0G/NP0, 0603 603 GRM1885C2A102JA01D
C33, C34, C43, C44,
C76 5 33uF CAP, AL, 33uF, 63V, +/-20%, 40 ohm, SMD SM_RADIAL_8MM EEHZC1J330P
C35, C36, C38, C39,
C40, C41, C46, C47 8 10uF CAP, CERM, 10uF, 100V, +/-20%, X7S, 2220 2220 C5750X7S2A106M
C45, C49, C79 3 10uF CAP, CERM, 10 µF, 50 V, +/- 10%, X7R, AEC-
Q200 Grade 1, 1210 1210_280 UMK325AB7106KMHT
C48 1 56uF CAP, AL, 56uF, 63V, +/-20%, 30 ohm, SMD SM_RADIAL_10BM
MEEHZC1J560P
C50 1 100pF CAP, CERM, 100pF, 25V, +/-10%, X7R, 0603 603 06033C101KAT2A
C51 1 10uF CAP, CERM, 10uF, 16V, +/-20%, X7R, 1206 1206 C3216X7R1C106M
C53 1 2.2uF CAP, CERM, 2.2uF, 25V, +/-10%, X7R, 0805 0805_HV GRM21BR71E225KA73L
C54 1 100pF CAP, CERM, 100 pF, 50 V, +/- 10%, X7R, 0402 402 CC0402KRX7R9BB101
C55, C57 2 4.7uF CAP, CERM, 4.7 µF, 10 V, +/- 10%, X7R, 0805 0805_HV LMK212B7475KG-T
C59 1 10uF CAP, CERM, 10uF, 10V, +/-10%, X7R, 0805 0805_HV GRM21BR71A106KE51L
C61, C62, C63, C64,
C65, C66, C69, C70,
C71, C72, C73, C74
12 2200p
FCAP, CERM, 2200 pF, 100 V, +/- 10%, X7R, 0603 603 06031C222KAT2A
C75 1 47uF CAP, CERM, 47 µF, 16 V, +/- 20%, X7R, 2220_250 C5750X7R1C476M230KB
C77 1 0.33uF CAP, CERM, 0.33 µF, 50 V, +/- 20%, X7R, 1206 1206 12065C334MAT2A
C78 1 0.047u
FCAP, CERM, 0.047 µF, 25 V, +/- 5%, X7R, 0603 603 06033C473JAT2A
D1 1 Rgb LED, Rgb, SMD SML_RGB_0404 SML-LX0404SIUPGUSB
D2 1 100V Diode, Schottky, 100 V, 10 A, AEC-Q101, TO-
277A TO-277A FSV10100V
D3 1 60V Diode, Schottky, 60 V, 1 A, AEC-Q101, SMB SMB CMSH1-60 TR13
D4 1 Red LED, Red, SMD 1105W_Red HBR1105W-TR
F1 1 Fuse, 15 A, SMD Fuse_SSQ SSQ 15
H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon, Philips
panhead NY PMS 440 0025 PH NY PMS 440 0025 PH
H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Keystone_1902C 1902C
J1 1 Connector, Receptacle, Mini-USB Type B, R/A,
Top Mount SMT CONN_USB-Mini-B- 1734035-2 1734035-2
J2 1 Header, 100mil, 12x1, Gold, TH TSW-112-07-G-S TSW-112-07-G-S
J3 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J4 1 BANANA JACK, 15A, Insulated, Nylon,Yellow CONN_108-0907-
001 108-0907-001
J5 1 Standard Banana Jack, Insulated, Red 6091 6091
J6, J8 2 Standard Banana Jack, Insulated, Black 6092 6092
J7 1 Header, 100mil, 1x1, Gold, TH Samtec_HTSW-101-
09-x-S HTSW-101-09-G-S

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J9 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J10 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J11 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J12, J16, J20, J21,
J22, J23, J24, J25,
J26, J31
10 Header, TH, 100mil, 2x1, Gold plated, 230 mil
above insulator TSW-102-07-G-S TSW-102-07-G-S
J13 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J14 1 Header, TH, 100mil, 2x2, Gold plated, 230 mil
above insulator TSW-102-07-G-D TSW-102-07-G-D
J15 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J17 1 Header, TH, 100mil, 2x1, Gold plated, 230 mil
above insulator TSW-102-07-G-S TSW-102-07-G-S
J18 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J19 1 Header, TH, 100mil, 3x1, Gold plated, 230 mil
above insulator TSW-103-07-G-S TSW-103-07-G-S
J27, J32, J34 3 Header, 100mil, 4x1, Gold, TH TSW-104-07-G-S TSW-104-07-G-S
J28 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J29 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J30 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
J33 1 Header, 100mil, 9x1, Vertical, TH Samtec_TSW-109-
07-G-S TSW-109-07-G-S
J35 1 Header, TH, 100mil, 1pos, Gold plated, 230 mil
above insulator TSW-101-07-G-S TSW-101-07-G-S
L1 1 2.2uH Inductor, Shielded, Powdered Iron, 2.2 µH, 10.5 A,
0.0137 ohm, SMD IHLP-3232DZ IHLP3232DZER2R2M01
L2 1 50
ohm Ferrite Bead, 50 ohm @ 100 MHz, 12 A, 1206 1206 BLM31SN500SZ1L
L3 1 22uH Inductor, Shielded, Powdered Iron, 22 µH, 12 A,
0.0265 ohm, AEC-Q200 Grade 0, SMD SRP1770TA SRP1770TA-220M
L4 1 9uH Coupled inductor, 9 µH, A, 0.0036 ohm, SMD MuRata_PLT10H PLT10HH501100PNL
LBL1 1 Thermal Transfer Printable Labels, 0.650" W x
0.200" H - 10,000 per roll Label_650x200 THT-14-423-10
Q1, Q2, Q3 3 50 V Transistor, NPN, 50 V, 0.1 A, AEC-Q101, SOT-416 SOT-416 DTC114EET1G, ON
Semiconductor
Q4 1 -60V MOSFET, P-CH, -60V, 30A, PowerPAK_SO-8L PowerPAK_SO-8L SQJ461EP
Q5 1 60V MOSFET, N-CH, 60 V, 25 A, AEC-Q101, SO-8FL SO-8FL NVMFS5C682NLT1G
Q6 1 60V MOSFET, N-CH, 60 V, 25 A, AEC-Q101, SO-8FL SO-8FL NVMFS5C682NLT1G
R1, R5, R6 3 10k RES, 10k ohm, 5%, 0.063W, 0402 402 CRCW040210K0JNED
R2 1 5.1 RES, 5.1, 5%, 0.75 W, AEC-Q200 Grade 0, 2010 2010 CRCW20105R10JNEF
R3 1 0.02 RES, 0.02 ohm, 1%, 3W, 2512 2512M CRA2512-FZ-R020ELF
R4, R7, R8, R9, R10,
R11, R12, R15, R17,
R26, R29, R30, R31,
R75, R76, R77, R78,
R79, R80, R81, R82,
R83
22 0 RES, 0 ohm, 5%, 0.063W, 0402 402 CRCW04020000Z0ED
R13, R16 2 27 RES, 27, 5%, 0.1 W, 0603 0603L CRCW060327R0JNEA
R14, R19, R28 3 10.0k RES, 10.0k ohm, 1%, 0.063W, 0402 402 CRCW040210K0FKED
R18 1 1.0Me
gRES, 1.0 M, 5%, 0.1 W, 0603 0603L CRCW06031M00JNEA
R20 1 0 RES, 0, 5%, 0.25 W, 1206 1206 RC1206JR-070RL
R21, R22, R23, R37,
R38, R40, R41, R44,
R45, R56, R60, R61,
R62, R67, R73, R74
16 0 RES, 0 ohm, 5%, 0.1W, 0603 603 MCR03EZPJ000