Texas Instruments TPS92682EVM User manual

TPS92682EVM Constant Current Two-channel
Boost And Boost-to-Battery
User's Guide
Literature Number: SLUUC13A
May 2019–Revised August 2019

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Table of Contents
Contents
1 Trademarks......................................................................................................................... 8
2 Description.......................................................................................................................... 8
2.1 Typical Applications...................................................................................................... 8
2.2 Warnings .................................................................................................................. 8
2.3 Connector Description................................................................................................... 8
3 REACH Compliance............................................................................................................ 10
4 Performance Specifications................................................................................................. 10
4.1 Boost Current Regulator............................................................................................... 10
4.2 Boost-to-Battery Current Regulator .................................................................................. 11
5 Performance Data and Typical Characteristic Curves ............................................................. 11
5.1 Startup Waveforms..................................................................................................... 12
5.2 PWM Dimming .......................................................................................................... 13
5.3 Faults..................................................................................................................... 13
5.4 EMI Scan ................................................................................................................ 14
6 Schematic, PCB Layout, and Bill of Materials ........................................................................ 15
6.1 Schematic................................................................................................................ 15
6.2 Layout.................................................................................................................... 16
6.3 Bill of Materials.......................................................................................................... 19
7 Software............................................................................................................................ 22
7.1 Demonstration Kit Software Installation for MSP-EXP432E401Y LaunchPad Board.......................... 22
7.2 Installation Error Recovery ............................................................................................ 30
7.3 Programming the MSP-EXP432E401Y LaunchPad Board ....................................................... 31
8 TPS92682EVM-70 Power UP and Operation ........................................................................... 36
8.1 SPI Command........................................................................................................... 38
8.2 GUI Devices Window................................................................................................... 39
Revision History.......................................................................................................................... 43

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List of Figures
List of Figures
1 Component Connections.................................................................................................... 9
2 CC Boost Efficiency for VIN = 12 V....................................................................................... 11
3 CC Buck-Boost Efficiency for VIN = 12 V................................................................................ 11
4 Softstart waveforms for CHxSS3:0 = 7.................................................................................. 12
5 Softstart waveforms for CHxSS3:0 = 31 ................................................................................ 12
6 CC Boost and Boost-to-Battery PWM Dimming........................................................................ 13
7 CC Boost Switch Current Sense ......................................................................................... 13
8 CC Boost LED Short Over-Current Protection ......................................................................... 14
9 CC Boost-to-Battery LED Open Over-Voltage Protection ............................................................ 14
10 CC Boost Conducted EMI Scan.......................................................................................... 14
11 CC Boost-to-Battery Conducted EMI Scan ............................................................................. 14
12 TPS92682EVM-70 Schematic............................................................................................ 15
13 TPS92682EVM-70 Assembly ............................................................................................ 16
14 TPS92682EVM-70 Top Layer and Top Overlay (Top View) ......................................................... 16
15 TPS92682EVM-70 Inner-layer 1 ......................................................................................... 17
16 TPS92682EVM-70 Inner-layer 2 ......................................................................................... 17
17 TPS92682EVM-70 Bottom Layer (Bottom View)....................................................................... 18
18 Setup Screen 1............................................................................................................. 22
19 Setup Screen 2............................................................................................................. 23
20 Setup Screen 3............................................................................................................. 23
21 Setup Screen 4............................................................................................................. 24
22 Setup Screen 5............................................................................................................. 24
23 Setup Screen 6............................................................................................................. 25
24 Setup Screen 7............................................................................................................. 25
25 Setup Screen 8............................................................................................................. 26
26 Setup Screen 9............................................................................................................. 26
27 Setup Screen 10............................................................................................................ 27
28 Setup Screen 11............................................................................................................ 27
29 Setup Screen 12............................................................................................................ 28
30 Setup Screen 13............................................................................................................ 28
31 Setup Screen 14............................................................................................................ 29
32 Setup Screen 15............................................................................................................ 29
33 Setup Screen 16............................................................................................................ 29
34 Setup Screen 17............................................................................................................ 30
35 Setup Screen 18............................................................................................................ 30
36 Driver Installation Error.................................................................................................... 31
37 LaunchPad Connection for Programming............................................................................... 32
38 UniFlash Programming, Step 1........................................................................................... 32
39 UniFlash Programming, Step 2........................................................................................... 33
40 UniFlash Programming, Step 3........................................................................................... 33
41 UniFlash Programming, Step 4........................................................................................... 34
42 UniFlash Programming, Step 5........................................................................................... 34
43 LaunchPad Connection for GUI Operation ............................................................................. 35
44 LaunchPad Connection to TPS92682EVM-70 ......................................................................... 36
45 GUI Setup Screen 1 ....................................................................................................... 37
46 GUI Setup Screen 2 ....................................................................................................... 37
47 GUI Setup Screen 3 ....................................................................................................... 37

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List of Figures
48 GUI, Main Window ......................................................................................................... 38
49 SPI Command Window.................................................................................................... 39
50 Devices Window............................................................................................................ 40
51 Devices Window Setting................................................................................................... 41
52 Fault Status after Pushing the Read Faults Once ..................................................................... 41
53 Fault Status after Pushing the Read Faults Twice..................................................................... 41
54 Enabling the EVM.......................................................................................................... 42
55 Fault Status ................................................................................................................. 42

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List of Tables
List of Tables
1 Connector Descriptions ..................................................................................................... 9
2 Test Points .................................................................................................................. 10
3 TPS92682EVM-070 Boost Channel Performance Specifications.................................................... 10
4 TPS92682EVM-070 Boost-to-Battery Channel Performance Specifications....................................... 11
5 TPS92682EVM-70 Bill of Materials...................................................................................... 19

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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TPS92682EVM Constant Current Two-channel Boost and Boost-to-Battery
User's Guide
SLUUC13A–May 2019–Revised August 2019
TPS92682EVM Constant Current Two-channel Boost and
Boost-to-Battery
This user's guide describes the specifications, board connection description, characteristics, operation,
and use of the TPS92682-Q1 constant current (CC) mode in boost and boost-to-battery configurations.
The TPS92682-Q1 device implements a fixed-frequency peak current mode control technique with
programmable switching frequency, slope compensation, and soft-start. Additional features include wide
input voltage range (4.5 V to 65 V), programmable spread spectrum frequency modulation, programmable
fault handling, and adjustable output current setting. A complete schematic diagram, printed circuit board
layouts, and bill of materials are included in this document.
1 Trademarks
SimpleLink, LaunchPad are trademarks of Texas Instruments.
2 Description
The TPS92682EVM-70 solution provides a two channel, constant current boost and boost-to-battery LED
current regulator which is configurable via serial peripheral interface (SPI). The EVM is designed to
operate with an input voltage in the range of 6.5 V to 20 V. The EVM provides maximum output power of
25 W for boost channel and 15 W for the boost-to-battery channel. The TPS92682EVM-70 provides high
efficiency, SPI programmable fault handling, ILED setting, and spread-spectrum. The channel-1 of the EVM
is configured as CC boost and channel-2 as CC boost-to-battery.
2.1 Typical Applications
This document outlines the operation and implementation of the TPS92682-Q1 as a two-channel boost
and boost-to-battery LED current regulator with the specifications listed in Table 3. For applications with a
different input voltage range or different ILED range, refer to the TPS92682-Q1 data sheet. The MSP-
EXP432E401Y SimpleLink™ Ethernet MSP432E401Y MCU LaunchPad™ Development Kit controls the
TPS92682EVM-70 evaluation board. The MSP-EXP432E401Y is available on TI website. However, any
SPI controller can be used to program the TPS92682EVM board. Ensure that the LaunchPad board from
TI has been programmed before running the GUI. The programming instructions are provided in
Section 7.
2.2 Warnings
Observe the following precaution when using the TPS92682EVM-70 evaluation module.
Caution hot surface. Contact may cause burns. Do not touch.
2.3 Connector Description
Table 1 describes the connectors and Table 2 lists the test points on the EVM and how to properly
connect, set up, and use the TPS92682EVM-70.
Figure 1 shows the connection diagram and the default jumper locations of the TPS92682EVM-70.

SSN0
DC
Power
Supply
+
t
A
t
+
+
t
A
+
t
V
CH1
LED
LOAD
t
+
Connection to other
SPI Controlled EVMs
SPI connection to
MSP-EXP432E401Y
LaunchPad connector J2/4
SPI connection to
MSP-EXP432E401Y
LaunchPad connector J1/3
+
t
A
+
t
V
CH2
LED
LOAD
t
+
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TPS92682EVM Constant Current Two-channel Boost and Boost-to-Battery
Figure 1. Component Connections
Table 1. Connector Descriptions
Connector Label Description
J10 SPI control from the
MSP-EXP432E401Y
LaunchPad
J10 and J11 allow attachment of a header cable for SPI control of the TPS92682-
Q1 to the TI SimpleLink™ Ethernet MSP-EXP432E401Y MCU LaunchPad™
Development Kit, part number MSP-EXP432E401Y
J11
J8 SPI control signals to
other SPI controlled
EVM J8 and J9 allow star connection of TPS92682EVM-70 boards to each other with one
MSP-EXP432E401Y control board.
J9
J1 VIN, GND J1 connects the input power to the TPS92682EVM-070. The board silkscreen
identifies VIN pins with "Vbatt" and the "GND" markings.
J2 Channel-1 and Channel-
2 and GND J2 is connected to the channel-1 output and J5 is connected to the channel-2 output of the TPS92682EVM-070.
J5
J6 VDD jumper J6 is a jumper provided to share VDD with other SPI controlled EVM, in case a
digital supply is needed. For the operation of this EVM, leave this jumper open.
J3
PWM1 and PWM2
jumpers
J3 and J4 are jumpers to apply external PWM signals to the two channels. When
the jumpers are removed and the R28 and R29 zero-Ωresistors are installed, the
PWM signals can be generated from the MSP-EXP432E401Y controller board.
When the jumpers are populated (by default), the PWM1 and PWM2 pins of the
TPS92682-Q1 are connected to VDD. The PWM signals can be used for PWM-
dimming of the LED current.
J4
J7 SSN configuration
jumper J7 allows configuration of the SSN chip select line, when multiple chips on the same
SPI bus are used. By default, evaluation module is configured to be connected to
the SSN0 of the MSP-EXP432E401Y controller board.

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TPS92682EVM Constant Current Two-channel Boost and Boost-to-Battery
Table 2. Test Points
Test Point Description
Metal turrets All metal turrets are grounds.
VBAT The VBAT test point allows for voltage measurement of the external power supply applied to the evaluation
board.
VIN The VIN test point allows for voltage measurement of the power applied to the boost and boost-to-battery
channels after the EMI filter.
VDD The VDD test point allows for voltage measurement of the VDD output of the TPS92682-Q1.
LH The LH test point allows for applying a voltage to the LH pin and placing the TPS92682-Q1 in Limp Home
mode
FLT1 The FLT1 test point can be used to monitor the fault occurrence of the channel-1. When a fault occurs, FLT1 voltage level goes low. Note that during power up, FLT1 is low (due to POR). The Fault pins can be reset by
setting bit-7 of the EN register 0x00.
FLT2 The FLT2 test point can be used to monitor the fault occurrence of the channel-2. When a fault occurs, FLT2
voltage level goes low. Note that during power up, FLT2 is low (due to POR). The Fault pins can be reset by
setting bit-7 of the EN register 0x00. The FLT2 test point can also be used for synchronizing of the
TPS92682-Q1 with an external clock.
EN EN test point is connected to the EN-pin of the TPS92682-Q1 device
PWM1 PWM1 test point is connected to the PWM1-pin of the TPS92682-Q1 device
PWM2 PWM2 test point is connected to the PWM2-pin of the TPS92682-Q1 device
LED1+ The LED1+ test point allows for voltage measurement of the channel-1 (boost) LED positive output.
LED1- The LED1- test point is connected to the channel-1 (boost) LED negative output. This test point is connected
to the EVM ground via a zero-Ωresistor
LED2+ The LED2+ test point is connected to the channel-2 (boost-to-battery) LED positive output.
LED2- The LED2- test point is connected to the channel-2 (boost-to-battery) LED negative output.
3 REACH Compliance
In compliance with the Article 33 provision of the EU REACH regulation we are notifying you that this EVM
includes component(s) containing at least one substance of very high concern (SVHC) above 0.1%. These
uses from Texas Instruments do not exceed 1 ton per year. The SVHC speciifications are:
Component
Manufacturer Component part number SVHC Substance SVHC CAS (when available)
PHOENIX CONTACT
GmbH & Co. KG 1715721 and 1715747 Lead (Pb) 7439-92-1
4 Performance Specifications
This section provides the performance specifications and requirements for the boost and boost-to-battery
LED current regulators.
4.1 Boost Current Regulator
The Table 3 provides the EVM electrical performance specifications for the boost current regulator,
channel-1.
Table 3. TPS92682EVM-070 Boost Channel Performance Specifications
Parameter Test Conditions MIN TYP MAX UNITS
Input Characteristics
Voltage, VIN 6.5 12 20 V
Maximum Input Current, IIN 4 A
Output Characteristics
LED forward voltage, VF(LED) 2.8 3.0 3.2 V