Texas Instruments TPS92520-Q1 User manual

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TPS92520-Q1 LaunchPad-Controlled, ECU
Evaluation Module User's Guide
User's Guide
Literature Number: SLUUC29B
August 2019–Revised October 2019

2SLUUC29B–August 2019–Revised October 2019
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Table of Contents
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Contents
1 Trademarks......................................................................................................................... 8
2 Description.......................................................................................................................... 9
2.1 Typical Applications...................................................................................................... 9
2.2 Warnings .................................................................................................................. 9
2.3 Connector Description ................................................................................................. 10
3 REACH Compliance............................................................................................................ 12
4 Performance Specifications................................................................................................. 12
4.1 ECU Current Regulator ................................................................................................ 12
5 Performance Data and Typical Characteristic Curves ............................................................. 13
5.1 Start-up Waveforms .................................................................................................... 13
5.2 PWM Dimming .......................................................................................................... 14
6 Schematic, PCB Layout, and Bill of Materials ........................................................................ 14
6.1 Schematic................................................................................................................ 14
6.2 Layout.................................................................................................................... 17
6.3 Bill of Materials.......................................................................................................... 20
7 GUI Installation, Description, and Use................................................................................... 23
7.1 TPS92520EVM-074 GUI Installer .................................................................................... 23
7.2 Programming the MSP-EXP432E401Y LaunchPad Board ....................................................... 28
8 TPS92520EVM-074 Power UP and Operation.......................................................................... 33
8.1 Launch the GUI (Graphical User Interface)......................................................................... 34
9 Appendix........................................................................................................................... 39
Revision History.......................................................................................................................... 40

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List of Figures
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List of Figures
1 TPS92520EVM-074 Block Diagram....................................................................................... 9
2 Component Connections.................................................................................................. 10
3 Jumper Placement for Launch Pad Use ................................................................................ 11
4 Boost Output Voltage Limit Adjustment ................................................................................. 12
5 ECU Metrics, VIN = 12 V, TPS92682 Boost Channel and 2 Channels from 1 x TPS92520 IC .................. 13
6 Start-up Waveforms........................................................................................................ 13
7 PWM Dimming with IADJ Level Adjustment............................................................................ 14
8 TPS92520EVM-074 Schematic .......................................................................................... 15
9 TPS92520EVM-074 Schematic - Page 2 ............................................................................... 16
10 TPS92520EVM-074 Assembly .......................................................................................... 17
11 TPS92520EVM-074 Inner Layer (Ground Plane)...................................................................... 18
12 TPS92520EVM-074 Inner-Layer 1....................................................................................... 18
13 TPS92520EVM-074 Bottom Layer (Bottom View)..................................................................... 19
14 Setup Screen 1............................................................................................................. 23
15 Setup Screen 2............................................................................................................. 24
16 Setup Screen 4............................................................................................................. 24
17 Setup Screen 5............................................................................................................. 25
18 Setup Screen 6............................................................................................................. 25
19 Setup Screen 7............................................................................................................. 26
20 Setup Screen 8............................................................................................................. 26
21 Setup Screen 9............................................................................................................. 27
22 Setup Screen 10............................................................................................................ 27
23 Setup Screen 11............................................................................................................ 27
24 Setup Screen 12............................................................................................................ 28
25 Setup Screen 13............................................................................................................ 28
26 LaunchPad Connection for Programming............................................................................... 29
27 UniFlash Programming, Step 1........................................................................................... 29
28 UniFlash Programming, Step 2........................................................................................... 30
29 UniFlash Programming, Step 4........................................................................................... 30
30 UniFlash Programming, Step 5........................................................................................... 31
31 Debug Probe Update Required on First Flash of Launch Pad....................................................... 31
32 LaunchPad Connection for GUI Operation ............................................................................. 32
33 LaunchPad Connection to the TPS92520EVM-074 ................................................................... 33
34 LaunchPad Connection to the TPS92520EVM-074 and PWR901 Matrix Manager EVM........................ 34
35 GUI Splash Screen with Configuration Information.................................................................... 35
36 GUI, Main Window (Numbered areas are for explanation purposes only) ......................................... 35
37 SPI Command Window.................................................................................................... 38
38 TPS92663EVM6-901 Addressing Outline............................................................................... 39

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List of Tables
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List of Tables
1 Connector Descriptions.................................................................................................... 11
2 TPS92520EVM-074 ECU EVM Performance Specifications......................................................... 12
3 TPS92520EVM-074 Bill of Materials..................................................................................... 20

WARNING
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General Texas Instruments High Voltage Evaluation (TI HV EMV) User Safety Guidelines
Always follow TI's set-up and application instructions, including use of all interface components within their
recommended electrical rated voltage and power limits. Always use electrical safety precautions to help
ensure your personal safety and those working around you. Contact TI's Product Information Center
http://ti.com/customer support for further information.
Save all warnings and instructions for future reference.
WARNING
Failure to follow warnings and instructions may result in personal injury,
property damage or death due to electrical shock and burn hazards.
The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed
printed circuit board assembly. It is intended strictly for use in development laboratory environments,
solely for qualified professional users having training, expertise and knowledge of electrical safety risks in
development and application of high voltage electrical circuits. Any other use and/or application are strictly
prohibited by Texas Instruments. If you are not suitable qualified, you should immediately stop from further
use of the HV EVM.
1. Work Area Safety:
a. Keep work area clean and orderly.
b. Qualified observer(s) must be present anytime circuits are energized.
c. Effective barriers and signage must be present in the area where the TI HV EVM and its interface
electronics are energized, indicating operation of accessible high voltages may be present, for the
purpose of protecting inadvertent access.
d. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes, and other
related apparatus used in a development environment exceeding 50Vrms/75VDC must be
electrically located within a protected Emergency Power Off EPO protected power strip.
e. Use stable and non-conductive work surface.
f. Use adequately insulated clamps and wires to attach measurement probes and instruments. No
freehand testing whenever possible.
2. Electrical Safety:
As a precautionary measure, it is always good engineering practice to assume that the entire EVM
may have fully accessible and active high voltages.
a. De-energize the TI HV EVM and all its inputs, outputs and electrical loads before performing any
electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely
de-energized.
b. With the EVM confirmed de-energized, proceed with required electrical circuit configurations,
wiring, measurement equipment hook-ups and other application needs, while still assuming the
EVM circuit and measuring instruments are electrically live.
c. Once EVM readiness is complete, energize the EVM as intended.

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WARNING
While the EVM is energized, never touch the EVM or its electrical
circuits, as they could be at high voltages capable of causing
electrical shock hazard.
3. Personal Safety
a. Wear personal protective equipment e.g. latex gloves or safety glasses with side shields or protect
EVM in an adequate lucent plastic box with interlocks from accidental touch.
Limitation for safe use:
EVMs are not to be used as all or part of a production unit.

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TPS92520EVM-074 LaunchPad-Controlled, ECU Evaluation Module
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User's Guide
SLUUC29B–August 2019–Revised October 2019
TPS92520EVM-074 LaunchPad-Controlled, ECU Evaluation
Module
This user's guide describes the specifications, board connection description, operation, and use of the
TPS92520EVM-074. The EVM consists of a CV boost stage, creating a regulated voltage rail that is used
by two TPS92520 ICs. The two TPS92520 ICs then create four current regulated channels for driving
strings of LEDs. The EVM is a representative of a lighting module suitable for automotive applications
creating advanced lighting features.
The TPS92520-Q1 buck current regulator device implements an adjustable constant on-time, valley
detect, current-mode control technique with programmable pseudo-fixed-frequency operation. Additional
features include the following:
• Wide input voltage range (4.5 V to 65 V)
• Analog adjustable output current setting
• Fault reporting
• Internal and external PWM dimming
The TPS92682-Q1 boost controller device implements a fixed-frequency peak-current mode control
technique with programmable switching frequency, slope compensation, and soft-start. Additional features
include the following:
• Wide input voltage range (4.5 V to 65 V)
• Programmable spread spectrum frequency modulation
• Programmable fault handling
• Adjustable output current setting
Optionally, to exercise advanced lighting control features, an accompanying EVM to the TPS92520 ECU
EVM, LMM EVM PWR901, can be used. The TPS92662-Q1 and TPS92663-Q1 (LMM, LED Matrix
Manager) devices include series-connected integrated switches for bypassing individual LEDs. The
individual sub-strings allow the device to accept either single or multiple current sources for bypassing
high current LEDs.
A complete schematic diagram, printed circuit board layouts, and bill of materials are included in this
document.

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TPS92520EVM-074 LaunchPad-Controlled, ECU Evaluation Module
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1 Trademarks
SimpleLink, LaunchPad are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.

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TPS92520EVM-074 LaunchPad-Controlled, ECU Evaluation Module
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2 Description
The TPS92520EVM-074 solution provides four current-regulated channels, providing up to 49.5 V, 1.6 A
for each channel (expandable voltage range with board modification), from a 12 V (nom) input. The four
TPS92520 channels and one dual-phase TPS92682 CV (constant voltage) channel are all configurable via
serial peripheral interface (SPI). The maximum output voltage of the TPS92682 CV boost can be
physically adjusted by modifying R34 (see Table 1). The EVM is designed to operate with an input voltage
in the range of 6 V to 40 V and provides a maximum total output power of 100 W (maximum of 50 W per
channel). For example, if one channel is operated at 50 W, the total power of the other three channels
must not exceed 50 W. The TPS92520EVM-074 provides a unique high-efficiency, SPI-programmable
solution with fault handling and reporting. It also includes standard ECU features: CAN (physical layer)
interface and reverse battery protection.
The EVM is operated via a standard TI LaunchPad (MSP-EXP432E401Y) and does not function if the
launchpad and GUI are not installed. It is possible to use your own or a different SPI controller after
reviewing the documentation for all parts in detail.
Figure 1 shows the block diagram of the system.
Figure 1. TPS92520EVM-074 Block Diagram
2.1 Typical Applications
This document outlines the operation and implementation of the TPS92520-Q1 as a four-channel LED
current regulator. Table 2 lists the specifications. For applications with a different input voltage range or
different ILED range, refer to the TPS92520-Q1 1.5-A Dual Synchronous Buck LED Driver Data Sheet. The
MSP-EXP432E401Y SimpleLink™ Ethernet MSP432E401Y MCU LaunchPad™ Development Kit controls
the TPS92520EVM-074 evaluation board. The MSP-EXP432E401Y is available on ti.com. Ensure that the
LaunchPad board from TI has been programmed using the UNIFLASH application before running the GUI.
Section 7 provides the programming instructions.
2.2 Warnings
Observe the following precaution when using the TPS92520EVM-074 evaluation module. Do not leave the
EVM powered when unattended.

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TPS92520EVM-074 LaunchPad-Controlled, ECU Evaluation Module
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CAUTION
Do not touch. This is a hot surface and contact can cause burns.
CAUTION
Do not stare at the operation LED: (Risk Group 2 (RG2) at a distance <0.9m),
(Risk Group 1 (RG1) at a distance > 0.9m(, (Risk Group Exempt (RGE) at a
distance > 1.8 m). The LED may be hardmful to the eyes. See IEC62471:2008
("photo biological safety of lamps and lamp systems") for risk group definitions.
2.3 Connector Description
Table 1 describes the connectors on the EVM and how to properly connect, set up, and use the
TPS92520EVM-074.
Figure 2 shows the connection diagram and the jumper locations of the TPS92520EVM-074.
Figure 2. Component Connections