Texas Instruments LP8866EVM User manual

1
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LP8866EVM User's Guide
User's Guide
SNVU685A–December 2019–Revised June 2020
LP8866EVM User's Guide
The Texas Instruments LP8866EVM evaluation module helps designers to evaluate the operation and
performance of the LP8866-Q1 device. This document includes a hardware setup instructions, software
instructions, a complete schematic diagram, printed-circuit board (PCB) layout, and bill of materials (BOM)
of the LP8866EVM.
Contents
1 Introduction ................................................................................................................... 2
2 Test Setup .................................................................................................................... 2
3 LP8866EVM Board Layout................................................................................................ 10
4 LP8866EVM Schematic ................................................................................................... 11
5 LP8866EVM Bill of Materials ............................................................................................. 12
6 LED Load Board............................................................................................................ 15
List of Figures
1 LP8866EVM Kit.............................................................................................................. 3
2 LP8866EVM Hardware Setup.............................................................................................. 4
3 LP8866/4 Family GUI Landing Page...................................................................................... 5
4 LP8866EVM GUI Home Page ............................................................................................. 5
5 LP8866EVM LED Control Page ........................................................................................... 6
6 LP8866EVM Monitor Faults Page......................................................................................... 7
7 LP8866EVM Diagnostics Page ............................................................................................ 8
8 LP8866EVM Register Map Page.......................................................................................... 9
9 LP8866EVM Layout - Top ................................................................................................ 10
10 LP8866EVM Layout - Bottom............................................................................................. 10
11 LP8866EVM Schematic ................................................................................................... 11
12 LP886X-LEDLOAD-EVM Schematic..................................................................................... 15
List of Tables
1 LP8866EVM Bill of Materials ............................................................................................. 12
2 LP886X-LEDLOAD-EVM Bill of Materials............................................................................... 15
Trademarks
All trademarks are the property of their respective owners.

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LP8866EVM User's Guide
1 Introduction
The LP8866EVM helps designers to evaluate the characteristics, operation, and use of the LP8866-Q1
device, a high-performance LED driver for automotive lighting. The LP8866-Q1 device is a high-efficiency
LED driver with boost controller. The six 200-mA high-precision current sinks support phase shifting that is
automatically adjusted based on the number of channels in use. LED brightness can be controlled globally
through the I²C interface or PWM input.
1.1 Features
The EVM has the following features:
• Up to 48-V Vout boost controller
• Six high-precision current sinks
• Supports built-in phase-shift PWM dimming, hybrid dimming, current dimming and direct PWM
dimming mode
• LED brightness controlled globally through I2C interface or PWM input
• Extensive fault diagnostics
1.2 Applications
Backlight for:
• Automotive infotainment
• Automotive instrument clusters
• Smart mirrors
• Heads-Up Displays (HUD)
• Central Information Displays (CID)
• Audio-Video Navigation (AVN)
2 Test Setup
This section describes how to properly connect and setup the LP8866EVM.
2.1 The LP8866EVM Kit
The LP8866EVM kit contains (see Figure 1):
• USB2ANY
– Ribbon cable
– USB cable
• LP8866EVM
• LP886X-LEDLOAD-EVM

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Figure 1. LP8866EVM Kit
2.2 System/Equipment Requirements
• DC power supply: 24 V or higher, 6 A or higher
• LED cable: 7-position ribbon cable
• PC to run GUI software
• GUI software
2.3 Hardware Setup
Figure 2 shows the hardware setup of the LP8866EVM.
• Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the
LP8866EVM.
• Connect the USB2ANY module to the PC with the USB cable.
• Connect the USB2ANY module to the LP8866EVM with the provided ribbon cable.
• Connect the LP8866EVM to the LP886X-LEDLOAD-EVM with a 7-position ribbon cable.

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Figure 2. LP8866EVM Hardware Setup
2.4 Software Installation
Download the GUI software from the LP8866EVM tools folder. Follow the instructions to finish the GUI
installation. Once installed, a shortcut to the GUI is found on the desktop and also in the start-up menu
under the Texas Instruments folder.
2.5 Quick Start-Up Procedure
1. After the hardware is connected successfully, run the GUI software. Turn on the 12-V external power
supply. Select the right device variant of the EVM, which is LP8866, as shown in Figure 3.

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Figure 3. LP8866/4 Family GUI Landing Page
2. Check the connection status button on the bottom left corner of the GUI. The button should be like the
one shown in Figure 3. There should be a "Hardware connected" message on the status bar next to the
button. If it shows "Hardware not Connected", click the button to connect to hardware manually. This
button can be used to connect or disconnect the GUI to the hardware during the evaluation.
3. Click "EXPLORE LP8866" to go to the LP8866EVM GUI home page (see Figure 4).
Figure 4. LP8866EVM GUI Home Page

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4. Click "Start" to go to the LED Control page (see Figure 5). On the LED Control page, the user can
control all the register based control functions of the device, like brightness control, current control, sloper
control, dither control, boost synchronization configuration and spread spectrum configuration.
Figure 5. LP8866EVM LED Control Page
2.6 Additional GUI Functions
In the selection tab on the left-hand side, the user can switch between LED Control, Monitor Faults,
Diagnostics and Register Map tabs. This section introduces GUI functions provided in the Monitor Faults,
Diagnostics and Register Map tabs.
2.6.1 Monitor Faults Page
From the Monitor Faults page (see Figure 6), the user has access to LP8866-Q1 fault status bits. Faults
can be cleared by software by clicking the "Clear All" button. Fault interrupt can be enabled or disabled
globally by toggling the "Interrupt All" button. Besides that, each fault interrupt and each fault status can be
controlled individually.

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Figure 6. LP8866EVM Monitor Faults Page
2.6.2 Diagnostics Page
From the Diagnostics page (see Figure 7), the user can read back the following diagnostics register
values and corresponding device status.
• FSM_LIVE_STATUS: current status of the functional state machine
• PWM_INPUT_STATUS: 16-bit value for detected duty cycle of PWM input signal
• PWM_OUTPUT_STATUS: 16-bit value for configured duty cycle of PWM output signal
• LED_CURRENT_STATUS: 12-bit current DAC code that brightness path is driving to OUT1-6 output
• VBOOST_STATUS: 11-bit boost voltage code that adaptive voltage control loop sending to analog
boost block
• AUTO_PWM_FREQ_SEL: LED PWM frequency value from PWM_SEL resistor detection
• AUTO_LED_STRING_CFG: LED string configuration from LED_SET resistor detection
• AUTO_BOOST_FREQ_SEL: boost switching frequency value from PWM_FSET resistor detection
• MODE_SEL: LED dimming mode value from MODE resistor detection

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Figure 7. LP8866EVM Diagnostics Page
2.6.3 Register Map Page
Figure 8 shows the registers map page. All the registers are available on this page. When "Auto Read" is
set to other than "Off", all the registers will be read automatically and periodically according to the interval
time the user selects. Otherwise the user will need to click "READ REGISTER" to read the selected
register or to click "READ ALL REGISTERS" to read all registers.
Clicking on the row of a register automatically updates the corresponding field view on the right side of the
page. The register value can be updated by modifying the hexadecimal value in the "Value" column or by
double-clicking the corresponding bit in the "Bits" column. The modified value is effective immediately if
"Immediate Write" is selected. When "Deferred Write" is selected, the modified value won't take effect until
the user clicks "WRITE REGISTER" button. All registers' value can be updated together by clicking
"WRITE ALL REGISTERS".

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Figure 8. LP8866EVM Register Map Page
2.7 Instructions for Standalone Evaluation
The LP8866EVM can be used for standalone evaluation (without GUI software and PC connection). To
support standalone mode, it must be modified from its default settings as described below:
1. Mount R20 to pull up EN input.
2. Change pullup and pulldown resistors to select spread spectrum enable (R18) or disable (R25) option.
3. Mount R19 to pull up PWM input for 100% brightness. If brightness needs to be changed from 100%,
connect external PWM source at PWM pin.
The minimum procedures for turning on the LEDs after modifications above are as follows:
1. Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the
LP8866EVM.
2. Connect LP886X-LEDLAOD-EVM board (6 strings, 8 LEDs per string) to J10 on the LP8866EVM.
3. Turn on the external power supply.

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3 LP8866EVM Board Layout
Figure 9 and Figure 10 illustrate the EVM board layout.
Figure 9. LP8866EVM Layout - Top
Figure 10. LP8866EVM Layout - Bottom

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4 LP8866EVM Schematic
Figure 11 shows the LP8866EVM schematic.
Figure 11. LP8866EVM Schematic

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5 LP8866EVM Bill of Materials
Table 1 lists the bill of materials for the LP8866EVM.
Table 1. LP8866EVM Bill of Materials
Designator QTY Value Part Number Manufacturer Description Package
Reference
!PCB1 1 PSIL099 Printed Circuit Board
C4, C5, C12,
C13, C47 5 10uF CGA6P1X7R1N106M250AC TDK CAP, CERM, 10 µF, 75 V,+/-
20%, X7R, AEC-Q200 Grade 1,
1210 1210
C6, C7, C8,
C9, C22 5 0.01uF GCM188R72A103KA37J MuRata CAP, CERM, 0.01 µF, 100 V,+/-
10%, X7R, AEC-Q200 Grade 1,
0603 0603
C14, C15 2 33uF EEHZC1J330P Panasonic CAP, Polymer Hybrid, 33 uF, 63
V, +/- 20%, 40 ohm, 8x10 SMD 8x10
C16, C17,
C20, C21 4 4.7uF CGA5L3X7R1H475K160AE TDK CAP, CERM, 4.7 µF, 50 V,+/-
10%, X7R, AEC-Q200 Grade 1,
1206 1206
C18, C19 2 0.01uF GCM155R71H103KA55D MuRata CAP, CERM, 0.01 uF, 50 V, +/-
10%, C0G/NP0, 0402 0402
C23 1 10uF UMK325AB7106KMHT Taiyo Yuden CAP, CERM, 10 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1,
1210 1210
C24 1 68uF EEE-FK1J680UP Panasonic CAP, AL, 68 uF, 63 V, +/- 20%, 0.65 ohm, AEC-Q200 Grade 2,
SMD SMT Radial F
C26 1 4.7uF GCM21BR71C475KA73L MuRata CAP, CERM, 4.7 uF, 16 V, +/- 10%, X7R, AEC-Q200 Grade 1,
0805 0805
C27, C31 2 0.1uF C0402C104K4RACAUTO Kemet CAP, CERM, 0.1 uF, 16 V, +/- 10%, X7R, AEC-Q200 Grade 1,
0402 0402
C29 1 2.2uF CGA4J3X7R1H225K125AB TDK CAP, CERM, 2.2 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1,
0805 0805
C30 1 4.7uF GCM31CR71C475KA37L MuRata CAP, CERM, 4.7 uF, 16 V, +/- 10%, X7R, AEC-Q200 Grade 1,
1206 1206
C33, C35,
C37, C39,
C41, C43 61000p
FCGA3E2X7R2A102K080AA TDK CAP, CERM, 1000 pF, 100 V,
+/- 10%, X7R, AEC-Q200
Grade 1, 0603 0603
C44 1 22uF CGA6P1X7R1C226M250AC TDK CAP, CERM, 22 uF, 16 V, +/- 20%, X7R, AEC-Q200 Grade 1,
1210 1210
C45, C46 2 1uF CGA5L2X7R1E105M160AA TDK CAP, CERM, 1 uF, 25 V, +/- 20%, X7R, AEC-Q200 Grade 1,
1206_190 1206_190
D1 1 100V FSV10100V Fairchild
Semiconductor Diode, Schottky, 100 V, 10 A, AEC-Q101, TO-277A TO-277A
D2, D3, D4 3 Super
Red VLMS20J2L1-GS08 Vishay- Semiconductor LED, Super Red, SMD 2.2x1.3x1.4mm
F1 1 0679L9150-01 Bel Fuse FUSE BRD MNT 15A
125VAC/VDC 2410
FB1 1 50
ohm BLM31SN500SZ1L MuRata Ferrite Bead, 50 ohm @ 100 MHz, 12 A, 1206 1206
FB2, FB3 2 560
ohm 782853561 Wurth Elektronik Ferrite Bead, 560 ohm @ 100 MHz, 1.5 A, 0805 0805
H1, H2, H3,
H4 4 NY PMS 440 0025 PH B&F Fastener Supply Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead Screw

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Table 1. LP8866EVM Bill of Materials (continued)
Designator QTY Value Part Number Manufacturer Description Package
Reference
H5, H6, H7,
H8 4 1902C Keystone Standoff
H9 1 PSIL110 PSIL110, LP886X-LEDLOAD-
EVM, CDDS#: 6631820
H10 1 USB2ANY USB2ANY, CDDS#: 6542513
J1, J6, J7 3 TSW-101-07-G-S Samtec Header, 100mil, 1pos, Gold, TH Testpoint
J4 1 6091 Keystone Standard Banana Jack,
Insulated, Red 6091
J5, J9 2 6092 Keystone Standard Banana Jack,
Insulated, Black 6092
J8 1 108-0907-001 Cinch
Connectivity BANANA JACK, 15A, Insulated, Nylon,Yellow 940x438x438mil
J10 1 TSW-110-07-G-S Samtec Header, 100mil, 10x1, Gold, TH 10x1 Header
J11 1 SBH11-PBPC-D05-RA-BK Sullins Connector
Solutions Header(shrouded), 2.54mm,
5x2, Gold, R/A, TH Header,
2.54mm, 5x2,
R/A, TH
J12, J13 2 TSW-104-07-G-S Samtec Header, 100mil, 4x1, Gold, TH 4x1 Header
L1 1 2.2uH IHLP3232DZER2R2M01 Vishay-Dale Inductor, Shielded, Powdered Iron, 2.2 uH, 10.5 A, 0.0137
ohm, SMD 322x158x322mil
L2 1 22uH IHLE4040DDER220M5A Vishay-Dale Inductor, Shielded, 22 µH, 4.1 A, 0.07544 ohm, AEC-Q200
Grade 0, SMD Shielded
Inductor
L3 1 9uH PLT10HH501100PNL MuRata Coupled inductor, 9 uH, 10A,
0.0036 ohm, SMD 12.9x6.6mm
Q1 1 -60V SQJ459EP-T1_GE3 Vishay-
Semiconductor MOSFET, P-CH, -60 V, -52 A, AEC-Q101, PowerPAK_SO-8L PowerPAK_SO- 8L
Q2 1 60V NVMFS5C673NLWFAFT1G ON
Semiconductor MOSFET, N-CH, 60 V, 50 A, SO-8FL SO-8FL
R2, R5 2 0 CRCW12100000Z0EAHP Vishay-Dale RES, 0, 1%, 0.75 W, AEC-Q200
Grade 0, 1210 1210
R3, R15 2 0.02 CRA2512-FZ-R020ELF Bourns RES, 0.02, 1%, 3 W, 2512 2512
R4 1 20.0k ERJ-3EKF2002V Panasonic RES, 20.0 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R6 1 49.9 CRCW060349R9FKEA Vishay-Dale RES, 49.9, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R7 1 10.0 CRCW060310R0FKEA Vishay-Dale RES, 10.0, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R8, R10,
R14, R33,
R36, R38 6 0 RMCF0603ZT0R00 Stackpole
Electronics Inc RES, 0, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603
R9 1 909k CRCW0603909KFKEA Vishay-Dale RES, 909 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R11 1 76.8k CRCW060376K8FKEA Vishay-Dale RES, 76.8 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R12 1 100k CRCW0603100KFKEA Vishay-Dale RES, 100 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R13 1 20.5k CRCW060320K5FKEA Vishay-Dale RES, 20.5 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R17, R21,
R22, R27,
R29 5 2.26k CRCW06032K26FKEA Vishay-Dale RES, 2.26 k, 1%, 0.1 W, AEC-
Q200 Grade 0, 0603 0603
R18, R19,
R23 3 10.0k RMCF0603FT10K0 Stackpole Electronics Inc RES, 10.0 k, 1%, 0.1 W, AEC- Q200 Grade 0, 0603 0603

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Table 1. LP8866EVM Bill of Materials (continued)
Designator QTY Value Part Number Manufacturer Description Package
Reference
R24, R28,
R30 3 3.92k CRCW06033K92FKEA Vishay-Dale RES, 3.92 k, 1%, 0.1 W, AEC- Q200 Grade 0, 0603 0603
R31 1 11.0k RMCF0603FT11K0 Stackpole
Electronics Inc RES, 11.0 k, 1%, 0.1 W, AEC- Q200 Grade 0, 0603 0603
R32 1 20.8k RT0603BRD0720K8L Yageo America RES, 20.8 k, 0.1%, 0.1 W, 0603 0603
U1 1 LP8866QDCPRQ1 Texas
Instruments Automotive Display LED-
backlight with Six 200-mA
Channels HTSSOP38
U2 1 TPS7B8250QKVURQ1 Texas
Instruments
Automotive 300-mA high-
voltage ultra-low-Iq low-dropout
(LDO) regulator, KVU0005A
(TO-252-5) KVU0005A
U3 1 TLV70033QDDCRQ1 Texas
Instruments
Single Output Automotive LDO,
200 mA, Fixed 3.3 V Output, 2
to 5.5 V Input, with Low IQ, 5-
pin SOT (DDC), -40 to 125
degC, Green (RoHS & no
Sb/Br)
DDC0005A
C1 0 220pF GRM188R72A221KA01D MuRata CAP, CERM, 220 pF, 100 V, +/-
10%, X7R, 0603 0603
C2, C3, C10,
C11 0 10uF CGA6P1X7R1N106M250AC TDK CAP, CERM, 10 µF, 75 V,+/-
20%, X7R, AEC-Q200 Grade 1,
1210 1210
C25, C28 0 220pF CGA2B2X7R1H221K050BA TDK CAP, CERM, 220 pF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1,
0402 0402
C32, C34,
C36, C38,
C40, C42 01000p
FCGA3E2X7R2A102K080AA TDK CAP, CERM, 1000 pF, 100 V,
+/- 10%, X7R, AEC-Q200
Grade 1, 0603 0603
FID1, FID2,
FID3, FID4,
FID5, FID6 0 N/A N/A Fiducial mark. There is nothing
to buy or mount. N/A
J2, J3, J14 0 TSW-101-07-G-S Samtec Header, 100mil, 1pos, Gold, TH Testpoint
R1 0 5.1 CRCW20105R10JNEF Vishay-Dale RES, 5.1, 5%, 0.75 W, AEC-
Q200 Grade 0, 2010 2010
R16, R34,
R35, R37 0 0 RMCF0603ZT0R00 Stackpole Electronics Inc RES, 0, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603
R20, R25,
R26 0 10.0k RMCF0603FT10K0 Stackpole Electronics Inc RES, 10.0 k, 1%, 0.1 W, AEC- Q200 Grade 0, 0603 0603

J4
OUTPUT6
J3
5
4
1
2
3
6
7
J2
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
VBOOST
5
4
1
2
3
J89
GND
J1
OUT6
J11J10 J13J12 J15J14 J17J16 J19J18 J21J20 J23J22 J25J24 J27J26 J29J28 J31J30 J33J32 J35J34 J37J36 J39J38 J41J40 J43J42 J45J44J7J6 J9J8
1 3
5
D1A
2 4
D1B
1 3
5
D2A
1 3
5
D3A
1 3
5
D4A
1 3
5
D5A
1 3
5
D6A
1 3
5
D7A
1 3
5
D8A
1 3
5
D9A
1 3
5
D10A
1 3
5
D11A
1 3
5
D12A
1 3
5
D13A
1 3
5
D14A
1 3
5
D15A
1 3
5
D16A
1 3
5
D17A
1 3
5
D18A
1 3
5
D19A
1 3
5
D20A
2 4
D2B
2 4
D3B
2 4
D4B
2 4
D5B
2 4
D6B
2 4
D7B
2 4
D8B
2 4
D9B
2 4
D10B
2 4
D11B
2 4
D12B
2 4
D13B
2 4
D14B
2 4
D15B
2 4
D16B
2 4
D17B
2 4
D18B
2 4
D19B
2 4
D20B
J53J52 J55J54 J57J56 J59J58 J61J60 J63J62 J65J64 J67J66 J69J68 J71J70 J73J72 J75J74 J77J76 J79J78 J81J80 J83J82 J85J84 J87J86J49J48 J51J50
1 3
5
D21A
2 4
D21B
1 3
5
D22A
1 3
5
D23A
1 3
5
D24A
1 3
5
D25A
1 3
5
D26A
1 3
5
D27A
1 3
5
D28A
1 3
5
D29A
1 3
5
D30A
1 3
5
D31A
1 3
5
D32A
1 3
5
D33A
1 3
5
D34A
1 3
5
D35A
1 3
5
D36A
1 3
5
D37A
1 3
5
D38A
1 3
5
D39A
1 3
5
D40A
2 4
D22B
2 4
D23B
2 4
D24B
2 4
D25B
2 4
D26B
2 4
D27B
2 4
D28B
2 4
D29B
2 4
D30B
2 4
D31B
2 4
D32B
2 4
D33B
2 4
D34B
2 4
D35B
2 4
D36B
2 4
D37B
2 4
D38B
2 4
D39B
2 4
D40B
J96J95 J98J97 J100J99 J102J101 J104J103 J106J105 J108J107 J110J109 J112J111 J114J113 J116J115 J118J117 J120J119 J122J121 J124J123 J126J125 J128J127 J130J129J92J91 J94J93
1 3
5
D41A
2 4
D41B
1 3
5
D42A
1 3
5
D43A
1 3
5
D44A
1 3
5
D45A
1 3
5
D46A
1 3
5
D47A
1 3
5
D48A
1 3
5
D49A
1 3
5
D50A
1 3
5
D51A
1 3
5
D52A
1 3
5
D53A
1 3
5
D54A
1 3
5
D55A
1 3
5
D56A
1 3
5
D57A
1 3
5
D58A
1 3
5
D59A
1 3
5
D60A
2 4
D42B
2 4
D43B
2 4
D44B
2 4
D45B
2 4
D46B
2 4
D47B
2 4
D48B
2 4
D49B
2 4
D50B
2 4
D51B
2 4
D52B
2 4
D53B
2 4
D54B
2 4
D55B
2 4
D56B
2 4
D57B
2 4
D58B
2 4
D59B
2 4
D60B
J138J137 J140J139 J142J141 J144J143 J146J145 J148J147 J150J149 J152J151 J154J153 J156J155 J158J157 J160J159 J162J161 J164J163 J166J165 J168J167 J170J169 J172J171J134J133 J136J135
1 3
5
D61A
2 4
D61B
1 3
5
D62A
1 3
5
D63A
1 3
5
D64A
1 3
5
D65A
1 3
5
D66A
1 3
5
D67A
1 3
5
D68A
1 3
5
D69A
1 3
5
D70A
1 3
5
D71A
1 3
5
D72A
1 3
5
D73A
1 3
5
D74A
1 3
5
D75A
1 3
5
D76A
1 3
5
D77A
1 3
5
D78A
1 3
5
D79A
1 3
5
D80A
2 4
D62B
2 4
D63B
2 4
D64B
2 4
D65B
2 4
D66B
2 4
D67B
2 4
D68B
2 4
D69B
2 4
D70B
2 4
D71B
2 4
D72B
2 4
D73B
2 4
D74B
2 4
D75B
2 4
D76B
2 4
D77B
2 4
D78B
2 4
D79B
2 4
D80B
J180J179 J182J181 J184J183 J186J185 J188J187 J190J189 J192J191 J194J193 J196J195 J198J197 J200J199 J202J201 J204J203 J206J205 J208J207 J210J209 J212J211 J214J213J176J175 J178J177
1 3
5
D81A
2 4
D81B
1 3
5
D82A
1 3
5
D83A
1 3
5
D84A
1 3
5
D85A
1 3
5
D86A
1 3
5
D87A
1 3
5
D88A
1 3
5
D89A
1 3
5
D90A
1 3
5
D91A
1 3
5
D92A
1 3
5
D93A
1 3
5
D94A
1 3
5
D95A
1 3
5
D96A
1 3
5
D97A
1 3
5
D98A
1 3
5
D99A
1 3
5
D100A
2 4
D82B
2 4
D83B
2 4
D84B
2 4
D85B
2 4
D86B
2 4
D87B
2 4
D88B
2 4
D89B
2 4
D90B
2 4
D91B
2 4
D92B
2 4
D93B
2 4
D94B
2 4
D95B
2 4
D96B
2 4
D97B
2 4
D98B
2 4
D99B
2 4
D100B
J221J220 J223J222 J225J224 J227J226 J229J228 J231J230 J233J232 J235J234 J237J236 J239J238 J241J240 J243J242 J245J244 J247J246 J249J248 J251J250 J253J252 J255J254J217J216 J219J218
1 3
5
D101A
2 4
D101B
1 3
5
D102A
1 3
5
D103A
1 3
5
D104A
1 3
5
D105A
1 3
5
D106A
1 3
5
D107A
1 3
5
D108A
1 3
5
D109A
1 3
5
D110A
1 3
5
D111A
1 3
5
D112A
1 3
5
D113A
1 3
5
D114A
1 3
5
D115A
1 3
5
D116A
1 3
5
D117A
1 3
5
D118A
1 3
5
D119A
1 3
5
D120A
2 4
D102B
2 4
D103B
2 4
D104B
2 4
D105B
2 4
D106B
2 4
D107B
2 4
D108B
2 4
D109B
2 4
D110B
2 4
D111B
2 4
D112B
2 4
D113B
2 4
D114B
2 4
D115B
2 4
D116B
2 4
D117B
2 4
D118B
2 4
D119B
2 4
D120B
MAX 200mA
4.99
R1
J46
OUTPUT5
J5
OUT5
MAX 200mA
4.99
R2
J88
OUTPUT4
J47
OUT4
MAX 200mA
4.99
R3
J131
OUTPUT3
J90
OUT3
MAX 200mA
4.99
R4
J173
OUTPUT2
J132
OUT2
MAX 200mA
4.99
R5
J215
OUTPUT1
J174
OUT1
MAX 200mA
4.99
R6
GND
VBOOST
www.ti.com LED Load Board
15
SNVU685A–December 2019–Revised June 2020
Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated
LP8866EVM User's Guide
6 LED Load Board
An LED load board LP886X-LEDLOAD-EVM is included in the EVM kit. The LED board is intended to be
used as the load for LED driver and can be configured for up to 6 strings and up to 20 LEDs in the string
(Number of LEDs in use is defined by jumpers). The initial setting on the board is 8 LEDs in series per
string. Cree XLamp ML-C LEDs with maximum current of 350 mA (for parallel use) and maximum forward
voltage of 3.4 V at 100 mA (3.2-V typical) are used on the board.
Figure 12. LP886X-LEDLOAD-EVM Schematic
Table 2. LP886X-LEDLOAD-EVM Bill of Materials
Designator QTY Part Number Manufacturer Description Package
Reference
!PCB1 1 PSIL110 Printed Circuit Board
D1…D120 120 MLCAWT-A1-0000-
000XE1 Cree Inc. LED XLAMP COOL WHITE 6500K 4SMD SMD4
H1, H2, H3, H4 4 NY PMS 440 0038 PH B&F Fastener
Supply
H5, H6, H7, H8 4 1902C Keystone Standoff
H9, H10, H11, H12 4 4802 Keystone
H13 1 MCH050 Gray smoked plexiglass, 0.125"
THK. Must comply with REACH
directive. Must meet or exceed
UL94-V0
7.53" X 4" X
0.125"
J7, J9...J43, J45; J49,
J51...J85, J87; J92,
J94...J128, J130; J134,
J136...J170, J172; J176,
J178...J212, J214; J217,
J219...J253, J255; J1, J3,
J4, J5, J46, J47, J88, J90,
J131, J132, J173, J174,
J215
133 TSW-102-07-G-S Samtec Header, 100mil, 2x1, Gold, TH 2x1 Header
J2 1 TSW-107-07-G-S Samtec Header, 100mil, 7x1, Gold, TH 7x1 Header

Revision History www.ti.com
16 SNVU685A–December 2019–Revised June 2020
Submit Documentation Feedback
Copyright © 2019–2020, Texas Instruments Incorporated
Revision History
Table 2. LP886X-LEDLOAD-EVM Bill of Materials (continued)
Designator QTY Part Number Manufacturer Description Package
Reference
J6, J8...J42, J44; J48,
J50...J84, J86; J91,
J93...J127, J129; J133,
J135...J169, J171; J175,
J177...J211, J213; J216,
J218...J252, J254
120 TSW-101-07-G-S Samtec Header, 100mil, 1pos, Gold, TH Testpoint
J89 1 TSW-105-07-G-S Samtec Header, 100mil, 5x1, Gold, TH 5x1 Header
R1, R2, R3, R4, R5, R6 6 CRCW12064R99FKEA
HP Vishay Dale Res Thick Film 1206 4.99 Ohm
1% 0.75W(3/4W) ±100ppm/C
Pad SMD Automotive T/R 1206
SH-J1...SH-J19 19 SPC02SYAN Sullins Connector
Solutions Shunt, 100mil, Flash Gold, Black Closed Top
100mil Shunt
FID1, FID2, FID3 0 N/A N/A Fiducial mark. There is nothing
to buy or mount. N/A
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (December 2019) to A Revision ................................................................................................ Page
• Changed resistors and connectors in Section 2.7.................................................................................... 9
• Changed LP8866EVM schematic in Figure 11...................................................................................... 11
• Changed LP8866EVM bill of materials in Table 1................................................................................... 12

STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

www.ti.com
2
3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software
associated with the kit to determine whether to incorporate such items in a finished product and software developers to write
software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or
otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition
that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.
Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must
operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
FCC Interference Statement for Class B EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
3.2 Canada
3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247
Concerning EVMs Including Radio Transmitters:
This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Concernant les EVMs avec appareils radio:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation
est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit
accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concerning EVMs Including Detachable Antennas:
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)
gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type
and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for
successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types
listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.
Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited
for use with this device.

www.ti.com
3
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et
d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage
radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope
rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. Le
présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le
manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne
non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de
l'émetteur
3.3 Japan
3.3.1 Notice for EVMs delivered in Japan: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page 日本国内に
輸入される評価用キット、ボードについては、次のところをご覧ください。
http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_01.page
3.3.2 Notice for Users of EVMs Considered “Radio Frequency Products” in Japan: EVMs entering Japan may not be certified
by TI as conforming to Technical Regulations of Radio Law of Japan.
If User uses EVMs in Japan, not certified to Technical Regulations of Radio Law of Japan, User is required to follow the
instructions set forth by Radio Law of Japan, which includes, but is not limited to, the instructions below with respect to EVMs
(which for the avoidance of doubt are stated strictly for convenience and should be verified by User):
1. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal
Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for
Enforcement of Radio Law of Japan,
2. Use EVMs only after User obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to
EVMs, or
3. Use of EVMs only after User obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan
with respect to EVMs. Also, do not transfer EVMs, unless User gives the same notice above to the transferee. Please note
that if User does not follow the instructions above, User will be subject to penalties of Radio Law of Japan.
【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて
いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの
措置を取っていただく必要がありますのでご注意ください。
1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用
いただく。
2. 実験局の免許を取得後ご使用いただく。
3. 技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ
ンスツルメンツ株式会社
東京都新宿区西新宿６丁目２４番１号
西新宿三井ビル
3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧ください。http:/
/www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page
3.4 European Union
3.4.1 For EVMs subject to EU Directive 2014/30/EU (Electromagnetic Compatibility Directive):
This is a class A product intended for use in environments other than domestic environments that are connected to a
low-voltage power-supply network that supplies buildings used for domestic purposes. In a domestic environment this
product may cause radio interference in which case the user may be required to take adequate measures.

www.ti.com
4
4EVM Use Restrictions and Warnings:
4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT
LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling
or using the EVM, including without limitation any warning or restriction notices. The notices contain important safety information
related to, for example, temperatures and voltages.
4.3 Safety-Related Warnings and Restrictions:
4.3.1 User shall operate the EVM within TI’s recommended specifications and environmental considerations stated in the user
guide, other available documentation provided by TI, and any other applicable requirements and employ reasonable and
customary safeguards. Exceeding the specified performance ratings and specifications (including but not limited to input
and output voltage, current, power, and environmental ranges) for the EVM may cause personal injury or death, or
property damage. If there are questions concerning performance ratings and specifications, User should contact a TI
field representative prior to connecting interface electronics including input power and intended loads. Any loads applied
outside of the specified output range may also result in unintended and/or inaccurate operation and/or possible
permanent damage to the EVM and/or interface electronics. Please consult the EVM user guide prior to connecting any
load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative.
During normal operation, even with the inputs and outputs kept within the specified allowable ranges, some circuit
components may have elevated case temperatures. These components include but are not limited to linear regulators,
switching transistors, pass transistors, current sense resistors, and heat sinks, which can be identified using the
information in the associated documentation. When working with the EVM, please be aware that the EVM may become
very warm.
4.3.2 EVMs are intended solely for use by technically qualified, professional electronics experts who are familiar with the
dangers and application risks associated with handling electrical mechanical components, systems, and subsystems.
User assumes all responsibility and liability for proper and safe handling and use of the EVM by User or its employees,
affiliates, contractors or designees. User assumes all responsibility and liability to ensure that any interfaces (electronic
and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely
limit accessible leakage currents to minimize the risk of electrical shock hazard. User assumes all responsibility and
liability for any improper or unsafe handling or use of the EVM by User or its employees, affiliates, contractors or
designees.
4.4 User assumes all responsibility and liability to determine whether the EVM is subject to any applicable international, federal,
state, or local laws and regulations related to User’s handling and use of the EVM and, if applicable, User assumes all
responsibility and liability for compliance in all respects with such laws and regulations. User assumes all responsibility and
liability for proper disposal and recycling of the EVM consistent with all applicable international, federal, state, and local
requirements.
5. Accuracy of Information: To the extent TI provides information on the availability and function of EVMs, TI attempts to be as accurate
as possible. However, TI does not warrant the accuracy of EVM descriptions, EVM availability or other information on its websites as
accurate, complete, reliable, current, or error-free.
6. Disclaimers:
6.1 EXCEPT AS SET FORTH ABOVE, EVMS AND ANY MATERIALS PROVIDED WITH THE EVM (INCLUDING, BUT NOT
LIMITED TO, REFERENCE DESIGNS AND THE DESIGN OF THE EVM ITSELF) ARE PROVIDED "AS IS" AND "WITH ALL
FAULTS." TI DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, REGARDING SUCH ITEMS, INCLUDING BUT
NOT LIMITED TO ANY EPIDEMIC FAILURE WARRANTY OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADE
SECRETS OR OTHER INTELLECTUAL PROPERTY RIGHTS.
6.2 EXCEPT FOR THE LIMITED RIGHT TO USE THE EVM SET FORTH HEREIN, NOTHING IN THESE TERMS SHALL BE
CONSTRUED AS GRANTING OR CONFERRING ANY RIGHTS BY LICENSE, PATENT, OR ANY OTHER INDUSTRIAL OR
INTELLECTUAL PROPERTY RIGHT OF TI, ITS SUPPLIERS/LICENSORS OR ANY OTHER THIRD PARTY, TO USE THE
EVM IN ANY FINISHED END-USER OR READY-TO-USE FINAL PRODUCT, OR FOR ANY INVENTION, DISCOVERY OR
IMPROVEMENT, REGARDLESS OF WHEN MADE, CONCEIVED OR ACQUIRED.
7. USER'S INDEMNITY OBLIGATIONS AND REPRESENTATIONS. USER WILL DEFEND, INDEMNIFY AND HOLD TI, ITS
LICENSORS AND THEIR REPRESENTATIVES HARMLESS FROM AND AGAINST ANY AND ALL CLAIMS, DAMAGES, LOSSES,
EXPENSES, COSTS AND LIABILITIES (COLLECTIVELY, "CLAIMS") ARISING OUT OF OR IN CONNECTION WITH ANY
HANDLING OR USE OF THE EVM THAT IS NOT IN ACCORDANCE WITH THESE TERMS. THIS OBLIGATION SHALL APPLY
WHETHER CLAIMS ARISE UNDER STATUTE, REGULATION, OR THE LAW OF TORT, CONTRACT OR ANY OTHER LEGAL
THEORY, AND EVEN IF THE EVM FAILS TO PERFORM AS DESCRIBED OR EXPECTED.