Infineon TLD5501-2QV Buck Demo User manual

User Manual Please read the Important Notice and Warnings at the end of this document Rev.2.00
www.infineon.com page 1 of 24 2021-04-12
TLD5501-2QV Buck Demo
User Manual
About this document
Product description
The TLD5501-2QV is an AEC qualified dual channel buck DC-DC controller especially designed for high power
automotive applications:
•Constant current (LED driver) and constant voltage regulation
•EMC optimized device: Spread spectrum
•Multiphase capability for voltage regulation
•SPI interface to configure each channel’s regulation and to read the diagnostic
•Limp home function (fail-safe mode)
Scope and purpose
Scope of this user manual is to provide to the audience instructions on usage of the TLD5501-2 BUCK DEMO
evaluation board (schematic version V5.0, PCB version R2).
Intended audience
This document is intended for engineers who need to perform measurements and check performances with
TLD5501-2 BUCK DEMO evaluation board.

User Manual 2 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Table of contents
1Table of contents
About this document....................................................................................................................... 1
1Table of contents ................................................................................................................... 2
2Description............................................................................................................................ 3
3Quick start procedure............................................................................................................. 4
4Infineon μIO stick and Infineon Toolbox.................................................................................... 6
4.1 Install and launch Config Wizard ............................................................................................................6
5Board control with PC GUI....................................................................................................... 8
5.1 Basic user interface.................................................................................................................................8
5.2 Engineering user interface......................................................................................................................9
6Operating range and power derating.......................................................................................11
7Efficiency Measurements .......................................................................................................12
8TLD5501-2 BUCK DEMO board configuration ............................................................................13
8.1 Dual buck independent voltage regulators..........................................................................................13
8.2 Dual buck independent current regulators..........................................................................................15
8.3 Single buck independent current regulator plus single buck independent voltage regulator..........17
9PCB - component placement...................................................................................................19
10 Schematic ............................................................................................................................20
11 Bill of Material ......................................................................................................................21
Revision history.............................................................................................................................23

User Manual 3 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Description
2Description
The TLD5501-2QV BUCK DEMO is an evaluation board for high power applications with the TLD5501-2QV product.
TLD5501-2QV is an AEC qualified dual channel buck DC-DC controller suitable for constant current (LED driver)
and constant voltage applications.
The default configuration of the evaluation board is “Dual buck parallel voltage regulator” in which the two
channels work in multiphase to provide up to 80 W to the load with an efficiency above 90%.
The board can be also configured for different scenarios:
•“Dual buck independent voltage regulators”: the two channels work as two independent constant
voltage supply.
•“Dual buck independent current regulators”: the two channels work as two independent constant
current supply (LED application).
•“Single buck independent current regulator plus single buck independent voltage regulator”: one
channel work as constant voltage supply and the other one as constant current supply (LED application).
Figure 1 TLD5501-2 BUCK DEMO evaluation board
Table 1 Board configuration and connectors
Components
Description
JP2, JP3
Jumpers to set the compensation network of ch1 and ch2 respectively:
Position 1 closed: 22 nF
Position 2 closed: 10 nF
Position 1 and 2 closed: 32 nF
RV2, RV4
Trimmers to adjust output voltage of ch1 and ch2 when set as voltage regulator
RV1, RV3
Trimmers to adjust output overvoltage (OV) and short to ground (S2G)
thresholds for each channel
X4
16-pin 2.54mm pitch connector (X4) for Infineon μIO interface or external
microcontroller interface
X2
Input power supply connector
X1, X3
Output voltage/current connector of each channel.
Optional: with SJ7 open it can be used as input power supply for the DC-DC
power stage.

User Manual 4 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Quick start procedure
3Quick start procedure
The default configuration of the board is “Dual buck parallel voltage regulator” in which the two channels work
in multiphase to provide up to 80 W to the load with an efficiency above 90%.
Table 2 Performance summary
Parameter
Conditions
Value
Input supply voltage VIC range
R1 = 39 kΩ, R5 = 20 kΩ
5.75 V to 40 V
Input supply voltage VPOW1/2 range
SJ7 closed, R1 = 39 kΩ, R5 = 20 kΩ
5.75 V to 40 V
Input supply voltage VPOW1/2 range
SJ7 open
4.5 V to 55 V
Maximum output power per channel
Vin = 12 V
40 W
Maximum output current per channel
-
7 A
Switching frequency
Set by R30 = 39 kΩ
287 kHz
Efficiency
Vin = 12 V, Rload = 1 Ω
> 92%
Output voltage range
Analog dimming = 100%, Set by RV2
potentiometer
1.5 V to 11.5 V
Overvoltage protection threshold
Set by RV1 potentiometer
1.5 V to 50 V
S2G protection threshold
Set by RV1 potentiometer,
MFSSETUP_CH1,2.LEDCHAIN_CH1,2 = 2
0.091 V to 3 V
Peak switch current limit
Set by R15 and R42
10 A
Analog dimming in Limp Home
IVCC = 5 V, set by R31 and R40
49%
Below, step by step procedures are laid out for setup and running the TLD5501-2 BUCK DEMO:
1. Connect a dummy load at the OUT terminals (Output ch1 or even Output ch2 are fine) which could
withstand the Max VOUT (i.e. 10W 4.7 Ωresistor)
2. Check compensation network is properly connected (JP2, and JP3 are closed).
3. Connect the μIO flat cable to X4 connector, paying attention to the polarity.
4. Connect the power supply at the IN terminals (VIC and GND).
5. Launch Infineon toolbox: refer to Chapter 4 to learn how to control the eval board with the PC GUI.
6. The GUI is set by default for “Dual buck parallel voltage regulator”, thus for a constant voltage regulation set
100% of PWM duty cycle and then enable the PWM: it could be possible that an output over voltage (OV) or
an output short to ground (S2G) is reported due to wrong RV1 and RV2 settings.
7. Set the OV and S2G thresholds to the desired values by rotating RV1.
8. Set the wanted output voltage by rotating RV2.
Note: It is possible to adjust output voltage from 0 to full scale (previously set by RV2) with the GUI Analog dimming
knob, but the best transient response is when analog dimming is set to 100%.

User Manual 5 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Quick start procedure
Figure 2 TLD5501-2 BUCK DEMO configuration for “Dual buck parallel voltage regulator” application
Figure 3 TLD5501-2 BUCK DEMO: Infineon µIO stick connection
GND
Power supply
GND
Output Voltage
Infineon µIO connector

User Manual 6 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
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 communication between the evaluation board and the PC GUI via SPI 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 4 Infineon μIO stick
The Infineon Toolbox it is a single platform interface which allows:
•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 5 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

User Manual 7 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Infineon μIO stick and Infineon Toolbox
Figure 6 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 7 Start Config Wizard tool
5. Click on TLD5501-2QV icon to start the LED GUI interface
Figure 8 Launch TLD5501-2QV GUI

User Manual 8 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Board control with PC GUI
5Board control with PC GUI
The TLD5501-2QV PC GUI consists of 2 interfaces:
•Basic user interface
•Engineering user interface
The GUI works only if the TLD5501-2 BUCK DEMO eval board is correctly connected to the μIO stick and
properly supplied.
NOTE: The text “ON/OFF” displayed on the PC GUI buttons shows the status of the item that is being utilized.
5.1 Basic user interface
Basic user interface allows simplified access to the main registers on TLD5501-2QV (e.g. analog dimming with a
knob) and provides direct feedback on TLD5501-2QV status, showing indicators for each standard diagnosis
register bit.
It is possible to provide EN signal, Limp Home signal (LHI) and PWMI without the need of a function generator.
In the “Power status Control” tab a window allows to select the regulation mode between “multiphase” in case
the 2ch work together to generate an output voltage, or “2-ch regulator” in case the two channels are working
independently from each other. In case the “multiphase” option is selected, the “Digital Dimming” and “Analog
dimming” tabs of the two channels are linked.
In order to turn on the device press the EN button: in 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
“Analog Dimming” tab.
Note: Analog dimming value is reset to 100% on each channel of the TLD5501-2QV device once the EN is turned off,
or the Limp Home is enabled. If the Limp Home is enabled the SPI is not accessible anymore, with the implication
that the analog dimming cannot be varied from the GUI. In Limp Home the analog dimming is defined by the
voltage applied on SET pin.
Figure 9 TLD5501-2QV GUI –Basic user interface

User Manual 9 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Board control with PC GUI
In the “Digital Dimming” tab it is possible to configure the PWMI frequency and duty cycle. In Order to enable
the DC-DC switching activity the PWM button need to be activated in ON state.
On the “Diagnosis/Monitoring” tab the standard diagnosis register is provided, showing information on the
working status of the device.
On the “EMC” tab the spread spectrum function can be enabled/disabled and configured.
Note: Spread Spectrum function is enabled by default.
5.2 Engineering user interface
The Engineering user interface allows the user to send a sequence of SPI commands to the TLD5501-2. PWMI
and EN pin control is also possible in this interface.
The suggested sequence of operations in order to send the SPI commands is:
6. Write the list of SPI commands that has to be sent
7. Turn on the device by pressing the EN button
8. Enable the switching activity by pressing PWMI button
9. Press the SEND button to send commands on the list, starting from the one highlighted in the list
Figure 10 TLD5501-2 GUI –Engineering user interface
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.

User Manual 10 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Board control with PC GUI

User Manual 11 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Operating range and power derating
6Operating range and power derating
The TLD5501-2 BUCK DEMO has very high efficiency, so it can deliver up to 40 W at the output on each channel
without a heat sink at TA= 25°C, VIN = 12 V IOUT < 7 A (see Figure 11 for power-derating curve).
Note: 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.
Pout[W]
6929 VIN[V]
40
20
12
30 TA=25°C
Figure 11 Output power derating curve (TA= 25°C, IOUT < 7 A)

User Manual 12 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Efficiency Measurements
7Efficiency Measurements
Efficiency of one channel in constant voltage regulation with a 1Ω load.
Figure 12 TLD5501-2 BUCK DEMO: one channel efficiency measurements

User Manual 13 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
TLD5501-2 BUCK DEMO board configuration
8TLD5501-2 BUCK DEMO board configuration
The default configuration of the evaluation board is “Dual buck parallel voltage regulator” in which the two
channels work in multiphase to provide up to 80 W to the load with an efficiency above 90%. The board can be
also configured for different scenarios:
•“Dual buck independent voltage regulators”: the two channels work as two independent constant
voltage supply.
•“Dual buck independent current regulators”: the two channels work as two independent constant
current supply (LED application).
•“Single buck independent current regulator plus single buck independent voltage regulator”: one
channel work as constant voltage supply and the other one as constant currentsupply (LED application).
8.1 Dual buck independent voltage regulators
In this configuration the two channels work as two independent constant voltage supply. The following board
configuration shall be applied:
Open (green): SJP2-SJP3-SJP4-SJP5-SJP6-SJP7-SJP8
Populate (orange): R11-R14-R16-R18-R20-R21-R36-R39-R43-R44-R45-R46-C27-C37
Not-populate (red): R12-R13-R37-R38
Close (blue): SJP9-SJP10
Figure 13 TLD5501-2 BUCK DEMO configuration for “Dual buck parallel voltage regulator” application

User Manual 14 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
TLD5501-2 BUCK DEMO board configuration
Optional: open SJ7 if separate VPOW1 and VPOW2 and VIC are needed, close SJ4 or SJ6 to increase the output
capacitor of the two channels.
Below, step by step procedures are laid out for setup and running the TLD5501-2 BUCK DEMO in this
configuration:
1. Connect a dummy load at the both OUT terminals (Output ch1 and Output ch2) which could withstand the
Max VOUT (i.e. 10W 4.7 Ω resistor)
2. Check compensation network is properly connected (JP2, and JP3 are closed).
3. Connect the μIO flat cable to X4 connector, paying attention to the polarity.
4. Connect the power supply at the IN terminals (VIC and GND).
5. Launch Infineon toolbox: refer to Chapter 4 to learn how to control the eval board with the PC GUI.
6. In the “Power Status Control” tab select the “2-ch regulator” to control each channel independently.
7. For a constant voltage regulation set 100% of PWM duty cycle and then enable the PWM: it could be possible
that an output over voltage (OV) or an output short to ground (S2G) is reported to one or both the channels
due to wrong RV1, RV2, RV3 and RV4 settings.
8. For each channel set the OV and S2G thresholds to the desired values by rotating RV1 and RV3 respectively.
9. For each channel set the wanted output voltage by rotating RV2 and RV4 respectively.
Note: It is possible to adjust output voltage from 0 to full scale (previously set by RV2 and RV4) with the GUI Analog
dimming knob, but the best transient response is when analog dimming is set to 100%.
Figure 14 TLD5501-2 BUCK DEMO configuration for “Dual buck independent voltage regulator”
application
GND
Power supply TLD5501-2QV
Output ch1
Power stage supply ch1
GND
GND
Power stage supply ch2
Output ch2
Infineon µIO connector

User Manual 15 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
TLD5501-2 BUCK DEMO board configuration
8.2 Dual buck independent current regulators
In this configuration the two channels work as two independent constant current supply for LED applications.
The following board configuration shall be applied:
Open (green): SJP2-SJP3-SJP4-SJP5-SJP6-SJP7-SJP8-SJP9-SJP10
Populate (orange): R12-R13-R14-R18-R37-R38-R39-R44
Not-populate (red): R11-R16-R20-R21-R36-R43-R45-R46-C27-C37
Figure 15 TLD5501-2 BUCK DEMO configuration for “Dual buck parallel current regulators” application
Optional: open SJ7 if separate VPOW1 and VPOW2 and VIC are needed, close SJ4 to increase the output
capacitor of channel1.
Below, step by step procedures are laid out for setup and running the TLD5501-2 BUCK DEMO in this
configuration:
1. Connect a LED load at the both OUT terminals (Output ch1 and Output ch2) which could withstand the
output current.
2. Check compensation network is properly connected (JP2, and JP3 are closed).
3. Connect the μIO flat cable to X4 connector, paying attention to the polarity.
4. Connect the power supply at the IN terminals (VIC and GND).

User Manual 16 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
TLD5501-2 BUCK DEMO board configuration
5. Launch Infineon toolbox: refer to Chapter 4 to learn how to control the eval board with the PC GUI.
6. In the “Power Status Control” tab select the “2-ch regulator” to control each channel independently.
7. For a constant current application set the target analog dimming, PWM frequency and duty cycle and then
enable the PWM: it could be possible that an output over voltage (OV) or an output short to ground (S2G) is
reported to one or both the channels due to wrong RV1, and RV3 settings.
8. For each channel set the OV and S2G thresholds to the desired values by rotating RV1 and RV3 respectively.
Note: It is possible to adjust output current from 0 to full scale (1A set by R2 and R28) with the GUI Analog dimming
knob, but the best transient response is when analog dimming is set to 100%.
Figure 16 TLD5501-2 BUCK DEMO configuration for “Dual buck independent current regulators”
application
GND
Power supply TLD5501-2QV
Output ch1
Power stage supply ch1
GND
GND
Power stage supply ch2
Output ch2
Infineon µIO connector

User Manual 17 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
TLD5501-2 BUCK DEMO board configuration
8.3 Single buck independent current regulator plus single buck
independent voltage regulator
In this configuration one channel work as constant voltage supply and the other one as constant current supply
(LED application). The following board configuration shall be applied:
Open (green): SJP2-SJP3-SJP4-SJP5-SJP6-SJP7-SJP8-SJP10
Populate (orange): R11-R14-R16-R18-R20-R21-R37-R38-R39-R44-C27
Not-populate (red): R12-R13-R36-R43-R45-R46-C37
Close (blue): SJP9
Figure 17 TLD5501-2 BUCK DEMO configuration for “Dual buck parallel current regulators” application
Optional: open SJ7 if separate VPOW1 and VPOW2 and VIC are needed.
Below, step by step procedures are laid out for setup and running the TLD5501-2 BUCK DEMO in this
configuration:
1. Connect a LED load at the ch2 out terminals which could withstand the output current, connect a dummy
load at the ch1 out terminals which could withstand the Max VOUT (i.e. 10W 4.7 Ω resistor)
2. Check compensation network is properly connected (JP2, and JP3 are closed).
3. Connect the μIO flat cable to X4 connector, paying attention to the polarity.

User Manual 18 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
TLD5501-2 BUCK DEMO board configuration
4. Connect the power supply at the IN terminals (VIC and GND).
5. Launch Infineon toolbox: refer to Chapter 4 to learn how to control the eval board with the PC GUI.
6. In the “Power Status Control” tab select the “2-ch regulator” to control each channel independently.
7. For a constant current application set the target analog dimming, PWM frequency and duty cycle and then
enable the PWM: it could be possible that an output over voltage (OV) or an output short to ground (S2G) is
reported to channel 2 due to wrong RV3 setting.
8. For a constant voltage regulation set 100% of PWM duty cycle and then enable the PWM: it could be possible
that an output over voltage (OV) or an output short to ground (S2G) is reported to channel 1 due to wrong
RV1 and RV2 setting.
9. For each channel set the OV and S2G thresholds to the desired values by rotating RV1 and RV3 respectively.
10.For channel 1 set the wanted output voltage by rotating RV2.
Note: It is possible to adjust output current of “channel 2” from 0 to full scale (1A set by R28) and the output voltage
of “channel 1” from 0 to full scale (previously set by RV2) with the GUI Analog dimming knob, but the best transient
response is when analog dimming is set to 100%.
Figure 18 TLD5501-2 BUCK DEMO configuration for “Dual buck independent current regulators”
application
GND
Power supply TLD5501-2QV
Output ch1
Power stage supply ch1
GND
GND
Power stage supply ch2
Output ch2
Infineon µIO connector

User Manual 19 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
PCB - component placement
9PCB - component placement
Figure 19 PCB component placement - top view

User Manual 20 of 24 Rev.2.00
2021-04-12
TLD5501-2 BUCK DEMO evaluation board
User Manual
Schematic
10 Schematic
Figure 20 Schematic