Infineon TLD5191IVREG-EVAL User manual

User guide Please read the Important Notice and Warnings at the end of this document Rev.2.00
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Z8F80142094
UG xxx (user guide number)
TLD5191IVREG-EVAL board
User guide
LITIX™ Power TLD5191ES
About this document
Board description
•TLD5191: Four switches buck boost DC-DC controller designed for automotive applications
•Constant current (LED) and constant voltage regulation
•High power, high efficiency buck-boost architecture
•Embedded PWM engine for digital dimming
•EMC optimized device: Spread spectrum
Scope and purpose
The scope of this user guide is to provide instructions on the use of the TLD5191ES device evaluation board
TLD5191IVREG-EVAL schematic version S03 PCB version P02.
The TLD5191IVREG-EVAL is an evaluation platform for the TLD5191ES, which can work as buck-boost LED driver,
or as a voltage regulator.
Figure 1 TLD5191IVREG-EVAL board
Intended audience
Hardware engineers

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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 .................................................................................................................................4
3.1.1 Embedded PWM engine .....................................................................................................................5
3.2 Set up as voltage regulator.....................................................................................................................6
4Operating range ....................................................................................................................... 7
5Electrical characteristics........................................................................................................... 8
6Efficiency measurements .......................................................................................................... 9
7Bill of material, layout and schematic .......................................................................................11
8Revision history ......................................................................................................................16

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Description
2Description
The 4 switches buck-boost converter architecture is among the most efficient buck-boost topologies for high
current applications. The TLD5191ES provides digital and analog dimming control and one flag for diagnostics.
The TLD5191IVREG-EVAL is an evaluation platform for the TLD5191ES as LED driver or voltage regulator.
The default configuration delivers a constant current LED driver with 1.5 A maximum output current. The output
current can be increased up to 6 A by changing resistor RSHO and RSHSW. (Refer to schematic, Figure 11). If higher
currents are needed, the output filter is bypassed by closing J01.
The following diagram is a simplified schematic. The complete schematic is available in Chapter 7.
+VBAT
GND
External
DIMMING
EN/
INUVLO
HSGD2
IVCC
FBL
FBH
PWMO
COMP
SOFT
START
FREQ
SET
PWMI
V OUT
VCC_INT
PWMI
SET
Set Freq. Resistor
Set Soft Start
Capacitor
Compensation Network
Current adjust
Dimming Adjust
AGND
TLD5191ES
5V
5V
5V
Open: PWMI set «high»
Closed: internal dimming
enabled
SWCS
VFB
GND-
VOUT+
24
16
15
20
19
23
13
17
10
9
14
12
8
21
Test point available on the board
VIN
1 4
HSGD1LSGD1
5
LSGD2
SGND 11
EMI
Filter
18 EF
5V
RED LED
EF
EMI
Filter
EN/INUVLO
SST
RSHO
RSET
RPWMI
Figure 2 TLD5191IVREG_EVAL board simplified schematic in constant current mode (LED driver)
By reconfiguring a few solder jumpers, the board can be used as a powerful voltage regulator.
The board can be configured with several trimmers and also contains two status LEDs:
•Trimmer to adjust output voltage when set as voltage regulator
•Trimmer to adjust output current (via SET pin)
•Trimmer to adjust the PWM duty cycle of embedded PWM engine (via PWMI pin)
•Two LEDs:
oOne blue LED showing TLD5191ES power on status (IVCC)
oOne red LED showing TLD5191ES faults status (EF)

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Quick start procedure
3Quick start procedure
Step-by-step procedures are laid out for setup and running the TLD5191IVREG-EVAL in all available
configurations.
In all configurations solder jumper J_EN has to be closed in order to enable the device via input supply lines.
Open J_EN to apply an external enable signal using EN test point.
3.1 Setup as LED driver
To configure the board as LED driver the following jumpers needs to be configured:
Table 1 Jumper position
Jumper name
Condition
Meaning
J_PWMI
Closed
Enable the embedded PWM engine
J_DIMM
Closed
Enable the embedded PWM engine duty cycle adjustment
JV1
Open
Enable the output current regulation
JV2
Open
Remove output bulk capacitance for constant voltage regulation
JV3
Closed
Disable output voltage regulation
JV4
Open
Disable output voltage regulation
JV5
Open
Disable output voltage feed forward
JO2
Open
Enable PMOS for PWM dimming
Notes:
Positive power supply
Negative power supply LED Cathode
Open
Jumper
Trimmer to
adjust
LED Anode
PWM Dimming
Closed
Jumper
Current adjustment
Figure 3 Constant current (LED driver) configuration

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Quick start procedure
1. If an external PWM signal is intended to be used, open J_PWMI jumper
2. Connect the LED load
3. Connect a 12 V power supply to the VIN connector →the blue LED should turn on indicating VIVCC present
4. Adjust IOUT via RSET (>150 mA suggested for better accuracy and transient response)
5. Adjust PWM duty cycle via RPWMI if enabled (see Chapter 3.1.1).
Note: If the output voltage is below 6 V (i.e. load of just one LED) it is recommended to close JO2 to
bypass the PMOS for PWM dimming in order to avoid excessive power dissipation on the PMOS
3.1.1 Embedded PWM engine
The embedded PWM engine provides an internal PWM signal without any external dimming signal required. It is
enabled when jumper J_PWMI is closed. If jumper J_DIMM is open, the PWMI pin is biased at 5 V and then the
duty cycle is 100%. Closing jumper J_DIMM, the duty cycle is adjustable by means of trimmer RPWMI. The PWM
frequency is fixed at nominal value of 270 Hz.

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Quick start procedure
3.2 Set up as voltage regulator
To configure the board as voltage regulator the following jumpers needs to be configured:
Table 2 Jumper position
Jumper name
Condition
Meaning
J_PWMI
Closed
Enable on board PWMI setting
J_DIMM
Open
Set PWMI at 5 V
JV1
Closed
Disable the output current regulation
JV2
Closed
Add output bulk capacitance for constant voltage regulation
JV3
Open
Enable output voltage regulation
JV4
Closed
Enable output voltage regulation
JV5
Closed
Enable output voltage feed forward
JO2
Closed
Bypass PMOS for PWM dimming
Notes:
Positive power supply
Negative power supply Negative output voltage
Open
Jumper
Trimmer
to adjust
Positive output voltage
Output voltage adjustment
Closed
Jumper
Set voltage on
SET pin > 1.5V
Figure 4 Voltage regulator configuration
1. Connect a 12 V power supply to the VIN connector
2. Rotate RSET trimmer fully clockwise (100% analog dimming, improves transient response and accuracy)
3. Rotate RVOLT trimmer to obtain the desired VOUT
4. Connect the load
Note: It is possible to adjust output voltage from 0 to full scale (previously set by RVOLT) by rotating RSET,
but the best transient response is obtained when analog dimming is set to 100%

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Operating range
4Operating range
The TLD5191IVREG-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.
Please note that the module does not implement thermal protection, so ensure proper cooling when output
power exceeds 60 W or input voltage drops below 9 V. Position the heat sink below the switching MOSFETs as
shown in Figure 5.
Figure 5 Heat sink placement (optional)
The heat sink shall be electrically insulated from the PCB by means of a thermal pad.

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Electrical characteristics
5Electrical characteristics
Table 3 TLD5191IVREG-EVAL version S03 P02 –electrical characteristics
Parameter
Symbol
Value
Unit
Note/Test Condition
Min.
Typ.
Max.
Input voltage
VIN
6.2
–
35
V
Minimum value set by resistor divider on the
EN/INUVLO pin
Output voltage
VOUT
2.15
6.2
–
41.8
22.5
V
LED driver mode: max. value set by the resistor
divider on VFB pin (overvoltage protection)
Voltage mode: max value set by RVOLT trimmer
Output current
IOUT
150
0
–
1500
6
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 Chapter 4 for power derating curve
Switching
frequency
fSW
–
385
–
kHz
Spread spectrum deviation is present
PWM frequency
PWMfreq
75
220
–
275
–
330
Hz
External PWM signal applied
Embedded PWM engine enabled

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Efficiency measurements
6Efficiency measurements
The following efficiency measurements have been taken under constant current configuration (LED driver). The
efficiency discontinuities are given by the controller mode changes from buck to buck-boost and from buck-
boost to boost. In buck-boost mode all the four external MOSFETs are switching, increasing the total losses,
while in buck or boost mode only two external MOSFETs are switching.
In particular, the change from boost to buck-boost mode is visible for 5 and 6 LEDs. The change from buck-
boost to buck mode is visible for 2 and 3 LEDs. Both the changes from boost to buck-boost mode and from
buck-boost to buck mode are visible for the 4 LED curves.
Figure 6 Efficiency versus input voltage for different loads

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Efficiency measurements
The efficiency performances have been obtained with the following configuration:
Table 4 Efficiency measurement configuration
EMI filters
Bypassed by closing solder jumpers JI1 and JO1
PMOS dimming
Bypassed by closing solder jumper JO2
Digital dimming
Duty cycle set to 100% by closing J_PWMI jumper and by opening J_DIMM jumper
Analog dimming
Output current set to 1.5 A via RSET trimmer

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Bill of material, layout and schematic
7Bill of material, layout and schematic
Table 5 BOM
Designator
Value
Footprint
Quantity
C1, C5, C9, C10, C16, C21
10uF
C1210
6
C2, C46
470nF
C1206
2
C3, C15
470pF
C0603
2
C4, C14
10nF
C0603
2
C6, C12, CBS1, CBS2
100nF
C0603
4
C7, C11, C13
4.7uF
C1210
3
C8, CV
220uF
CAPAE830X1050N
2
C55
1uF
C0805
1
CC1
22nF
C0805
1
CIVCC
10uF
C0805
1
CSST
22nF
C0603
1
DBS1, DBS2
BAT46WJ,115
SOD323F
2
DZ1, DZ3
10V
SOD323
2
IC1
TLD5191ES
TSDSO24
1
J_DIMM, J_PWMI
TSM-102-01-S-SV
CON-M-SMD-TSM-102-01-S-SV
2
L1
10uH
Coilcraft XAL1010
1
L2, L3
1.8uH
Coilcraft XAL6030
2
LED_EF1
Red
LED 0805
1
LED_IVCC
Blue
LED 0805
1
Q1, Q2
IPZ40N04S5L-7R4
PG-TSDSON-8-32
2
Q3, Q4
IAUZ30N06S5L140
PG-TSDSON-8-32
2
Q5
BSZ086P03NS3 G
PG-TSDSON-8
1
Q6
BSO615CGXUMA1
PG-DSO-8
1
REN3
10kΩ
R0603
1
R2
44.2kΩ
R0805
1
R3
2.2kΩ
R0805
1
R5
910Ω
R0805
1
R6, R8
4.7Ω
R0603
2
R7, R11
10kΩ
R0805
2
R9
22kΩ
R0805
1
R10
470Ω
R0805
1
R12, RVH
47kΩ
R0805
2
R14
5.6kΩ
R0805
1
R1, R4,
5.6kΩ
R0603
2
R16
150Ω
R0603
1
R17
1.5kΩ
R0603
1

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Bill of material, layout and schematic
Designator
Value
Footprint
Quantity
R21
2.2kΩ
R0603
1
RC1
1kΩ
R0805
1
RC2
3.3MΩ
R0805
1
RFREQ
27kΩ
R0805
1
RG1, RG2, RG3, RG4
10Ω
R0603
4
RG5
0Ω
R0603
1
RPWMI, RSET, RVOLT
Bourns 3266Y-1-203LF
-
3
RSHO
100mΩ
R0612
1
RSHSW
7mΩ
R1206
1
RVL
1.5kΩ
R0805
1

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Bill of material, layout and schematic
Figure 7 PCB layout top view
Figure 8 PCB layer 2

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Bill of material, layout and schematic
Figure 9 PCB layer 3
Figure 10 PCB layout bottom view

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Bill of material, layout and schematic
Figure 11 Schematic view

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Revision history
8Revision history
Document
version
Date of release
Description of changes
Rev. 2.00
2022-11-03
•Updated description text
•Repaired typo in Figure 2
•Updated Figure 1, Figure 3 and Figure 4, Figure 6
•Updated Table 4
•Added PCB layout Figure 7, Figure 8, Figure 9, Figure 10
•Editorial improvements
Rev. 1.00
2021-04-13
Initial User guide

Published by
Infineon Technologies AG
81726 Munich, Germany
© 2022 Infineon Technologies AG.
All Rights Reserved.
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IMPORTANT NOTICE
The information contained in this application note is
given as a hint for the implementation of the product
only and shall in no event be regarded as a
description or warranty of a certain functionality,
condition or quality of the product. Before
implementation of the product, the recipient of this
application note must verify any function and other
technical information given herein in the real
application. Infineon Technologies hereby disclaims
any and all warranties and liabilities of any kind
(including without limitation warranties of non-
infringement of intellectual property rights of any
third party) with respect to any and all information
given in this application note.
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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
intended application and the completeness of the
product information given in this document with
respect to such application.
For further information on the product, technology,
delivery terms and conditions and prices please
contact your nearest Infineon Technologies office
(www.infineon.com).
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dangerous substances. For information on the types
in question please contact your nearest Infineon
Technologies office.
Except as otherwise explicitly approved by Infineon
Technologies in a written document signed by
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Edition 2022-11-03
Z8F80142094