Infineon TLD5542-1IVREG-EVAL User manual

User Manual Please read the Important Notice and Warnings at the end of this document Rev.1.00
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TLD5542-1IVREG-EVAL evaluation board
User Manual
About this document
Product description
TLD5542-1: H-Bridge buck-boost DC-DC controller designed for high power, high efficiency automotive
applications
• Constant current (LED) and constant voltage regulation
• SPI for diagnostics and control
• Limp home function (Fail-safe mode)
• EMC optimized device: Spread spectrum
Scope and purpose
Scope of this user manual is to provide to the audience instructions on usage of the TLD5542-1 device evaluation
board TLD5542-1IVREG-EVAL schematic version S01 PCB version P01
The TLD5542-1IVREG-EVAL is an evaluation platform for the TLD5542-1, which can work as buck-boost LED driver,
or as a voltage regulator.
Figure 1 TLD5542-1IVREG-EVAL device evaluation board
Intended audience
Hardware engineers, software engineers, system architects

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Table of contents
1Table of contents
About this document......................................................................................................................... 1
1Table of contents...................................................................................................................... 2
2Description .............................................................................................................................. 3
3Quick start procedure............................................................................................................... 4
3.1 Setup as LED driver limp home mode (microcontroller-less) ...............................................................4
3.2 Set up as voltage regulator - Limp home mode (μC-less –no PC GUI)..................................................5
3.3 Connecting the board to the μIO stick....................................................................................................6
4Infineon μIO stick and Infineon Toolbox ..................................................................................... 8
4.1 Install and launch Config Wizard ............................................................................................................9
5Board control with PC GUI........................................................................................................10
5.1 Basic user interface ...............................................................................................................................10
5.2 Engineering user interface....................................................................................................................11
6Operating range and power derating ........................................................................................13
7Electrical characteristics..........................................................................................................14
8PCB layout..............................................................................................................................15
9Schematic...............................................................................................................................16
Revision history...............................................................................................................................17

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Description
2Description
The H-Bridge architecture is among the most efficient buck-boost topologies for high current applications. The
TLD5542-1 provides complete control and diagnostics through the SPI interface.
The device can be used in microcontroller-less applications, because of the limp home mode.
The TLD5542-1IVREG-EVAL is an evaluation platform for the TLD5542-1 as LED driver or voltage regulator.
The default configuration is constant current LED driver with 1.5 A maximum output current. The output current
can be increased up to 6A by changing RSHO. If higher currents are needed, the output filter has to be bypassed.
Figure 2 TLD5542-1 as LED driver
By reconfiguring a few solder jumps, the board becomes a powerful voltage regulator.
Figure 3 TLD5542-1 as voltage regulator
On the board, in addition the following are present:
16-pin 2.54 mm pitch connector for µIO interface or external microcontroller interface
Limp home jumper for microcontroller-less operation
Trimmer to adjust output voltage when set as voltage regulator
Trimmer to adjust output current when set as LED driver and limp home

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Quick start procedure
3Quick start procedure
Below, step by step procedures are laid out for setup and running the TLD5542-1IVREG-EVAL in all available
configurations.
Installation procedure for PC GUI (graphical user interface) and μIO stick interface is described from Chapter 4.
3.1 Setup as LED driver limp home mode (microcontroller-less)
The following is the simplest configuration, in order to start evaluating the TLD5542-1 without a
microcontroller connection, and without µIO stick. In limp home all the registers are set to their default value,
and the analog dimming is provided by the voltage on the SET pin (adjustable with RSET trimmer).
1. Configure solder jumper for LED driver configuration: Figure 4
2. Connect LHI (limp home), J_EN (Enable) and J_PWMI jumpers
Figure 4 Connect loads and set jumpers for limp home
3. Connect the LED load
4. Connect a 12 V power supply to the VIN connector →the LED should turn on indicating IVCC present
5. Adjust IOUT with RSET (>150 mA suggested for better accuracy and transient response)
Figure 5 Connect power supply and adjust LED current

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Quick start procedure
3.2 Set up as voltage regulator - Limp home mode (μC-less – no PC GUI)
1. Configure solder jumper for VREG (Figure 6), if IOUT > 3 A bypass RSHO with a solder joint on the resistor top
2. Connect J_EN, LHI and PWMI jumpers
Figure 6 Voltage regulator , set LHI and EN jumpers, populate solder jumps
3. Connect a 12 V power supply to the VIN connector
4. Rotate RSET trimmer fully clockwise (100% analog dimming, improves transient response and accuracy)
Figure 7 Connect power supply
5. Rotate RVOLT trimmer to obtain the desired VOUT
Figure 8 Adjust VOUT using RVOLT

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Quick start procedure
6. Connect the load
3.3 Connecting the board to the μIO stick
1. Configure solder jumpers for voltage regulator/LED driver as described in previous chapters
2. Remove jumpers plug j_LHI, J_PWMI, J_EN
Figure 9 Control with μIO stick: remove jumpers
3. Connect the μIO flat cable to j_uIO connector, paying attention to the polarity (pin 1 is marked on the PCB)
4. Connect a 12 V power supply to the VIN connector
Figure 10 Voltage regulator with μIO stick: connect μIO and power supply
5. Launch Infineon toolbox, see chapter 5 to learn how to control the eval board with the PC GUI
6. In case of voltage regulator: rotate RVOLT trimmer to obtain the maximum desired VOUT: analog dimming can
then be used on the Config Wizard GUI to reduce VOUT, but full scale has to be set by RVOLT

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Quick start procedure
Figure 11 Voltage regulator with μIO stick: Adjust full scale (100% ADIM) VOUT
7. Connect the load
NOTE:
It is possible to adjust output voltage from 0 to full scale (previously set by RVOLT) with the GUI Analog
dimming knob, but the best transient response is when analog dimming is set to 100%.

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Infineon μIO stick and Infineon Toolbox
4Infineon μIO stick and Infineon Toolbox
The Infineon μIO stick is an interface device for controlling Infineon boards/kits during run time
through PC.
Enables the connection between the evaluation board and USB for SPI programming and monitoring
by using the Config Wizard software, which can be downloaded via the Infineon Toolbox.
Plugs into the evaluation board via a standard 16-pin connector and allows easy interface to the
microcontroller via USB for SPI, CAN, LIN communication etc.
Figure 12 μIO stick to the PC and the μIO flat cable to the evalboard
The Infineon Toolbox it is a single platform interface which allows for:
Quick installation of tools by name or QR code
Help with documentation
Viewing and starting installed tools from built-in launcher
Receiving update notifications
Figure 13 Infineon Toolbox
For details about Infineon toolbox and μIO stick check the Infineon website: Infineon Toolbox.

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Infineon μIO stick and Infineon Toolbox
4.1 Install and launch Config Wizard
1. Open the “Manage tools” tab
2. Search for “Config Wizard for LED” and click on “Install”button
Figure 14 Install Config Wizard for LED
3. Select “My Tools” tab on Infineon Toolbox
4. Press “Start” on the config wizard for LED to start
Figure 15 Start Config Wizard tool
5. Click on TLD5542-1 icon to start the LED GUI interface
Figure 16 Launch TLD5542-1 GUI

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Board control with PC GUI
5Board control with PC GUI
The TLD5542-1 PC GUI consists of 2 interfaces:
Basic user interface
Engineering user interface
The GUI works only if the TLD5542-1 EVALBOARD is correctly connected to the μIO stick and power supply is
applied to the VIN connector.
NOTE: The text “ON/OFF”displayed on the PC GUI buttons, shows the action that will be performed, and not
the status, of the item that is being utilized. For example, enable button showing “ON” → device is actually off
and if the button is pressed device will turn on.
5.1 Basic user interface
Basic user interface allows simplified access to the main registers on TLD5542-1 (e.g. analog dimming with a
knob) and provides direct feedback on TLD5542-1 status, showing indicators for each standard diagnosis
register bit.
It is possible to provide EN signal and PWMI without the need for a function generator.
In order to turn on the device press the EN button, the “Power State Feedback” tab, the “Active” indicator shall
turn on.
Only once the device is on, the desired analog dimming value can be set by the ”Analog Dimming” knob on the
“Dimming” tab.
NOTE: Analog dimming value is reset to 100% on the TLD5542-1 device once the EN is turned off.
Figure 17 TLD5542-1 GUI –Basic user interface
On the “Diagnosis/Monitoring” tab, (see Figure 17 ) the standard diagnosis register is provided, showing
information on the working status of the device.

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Board control with PC GUI
On the “Compensation Setting” tab (see Figure 18 ), it is possible to tune the compensation transfer function in
order to have the smoothest transition from buck-boost to boost mode, which depends by the switching
frequency (385 kHz for the TLD5542-1 IVREG_EVAL board)
Figure 18 TLD5542-1 GUI basic user interface –compensation and EMC tabs
5.2 Engineering user interface
The Engineering user interface allows the user to send a sequence of SPI commands to the TLD5542-1. PWMI
and EN pin control is also possible in this interface.
The suggested sequence of operations in order to send the SPI commands is:
1. Write the list of SPI commands that has to be sent
2. Turn on the device by pressing the EN button
3. Enable the switching activity by pressing PWMI button
4. Press the SEND button to send commands on the list, starting from the one highlighted in the list
Figure 19 TLD5542-1 GUI –Engineering user interface

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Board control with PC GUI
It is possible to describe each command with a comment and to save the list of commands by clicking on the
“Save” button.
It is possible to set the delay applied before executing the next command in the “Delay”column, the accuracy
of the timer is approximately 10 ms.
Figure 20 TLD5542-1 GUI –writing comment - saving command list - delay between commands

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Operating range and power derating
6Operating range and power derating
The TLD5542-1IVREG-EVAL has very high efficiency, so it can deliver up to 60 W at the output without a heat sink
at TA= 25°C, VIN = 12 V ( see Figure 22 for power-derating curve).
Please note that the module does not implement thermal protection, so ensure proper cooling when output
power exceeds the power-derating curve. The heat sink has to be positioned below the switching MOSFETs as
shown in Figure 21.
Figure 21 TLD5542-1 Heat sink placement
The heat sink shall be electrically insulated from the PCB, by means of a thermal pad.
Pout[W]
6935 VIN[V]
60
30
12
45
Figure 22 Output power derating curve (TA= 25°C )

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Electrical characteristics
7Electrical characteristics
Table 1 TLD5542-1IVREG-EVAL version S01 P01 –electrical characteristics
Parameter
Symbol
Value
Unit
Note/Test Condition
Min.
Typ.
Max.
Input voltage
VIN
5.5
-
35
V
Power derating may occur for VIN < 9 V
Out voltage
VOUT
2
3.3
–
51
22.5
V
LED driver mode
Voltage mode
Output current
IOUT
150
0
–
–
1500
5
mA
A
LED driver mode (up to 6 A by changing RSHO)
Voltage mode
Output power
POUT
-
60
W
VIN 12 V to 35 V, TA= 25°C
see Figure 22 for power derating curve
Switching
frequency
Switching
frequency
–
385
–
kHz
Spread spectrum deviation is present
PWM frequency
PWMfreq
100
–
500
Hz
System efficiency
Eff
–
96
–
%
VIN = 13.5 V
LED mode: 8 LED, IOUT = 1500 mA,

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PCB layout
8PCB layout
Figure 23 PCB layout top view

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Schematic
9Schematic
Figure 24 Schematic

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Revision history
Revision history
Document
version
Date of release
Description of changes
Rev. 1.00
2020-05-25
Initial User Manual

Published by
Infineon Technologies AG
81726 München, Germany
© 2020 Infineon Technologies AG.
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Technologies hereby disclaims any and all
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intended for technically trained staff. It is the
responsibility of customer’s technical departments
to evaluate the suitability of the product for the
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respect to such application.
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contact your nearest Infineon Technologies office
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dangerous substances. For information on the types
in question please contact your nearest Infineon
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