Infineon TLD5542-1 User Manual
UM TLD5542-1 eval
TLD5542-1 Multichannel evalboard V4.5
User Manual
About this document
Product description
TLD5542-1QV: 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 Multichannel
evalboard V4.4 and relative PC GUI.
The TLD5542-1 Multichannel evalboard V4.4 it is an evaluation platform for the TLD5542-1, which can drive 3 LED
functions (HB, LB, DRL), with a single efficient DC/DC converter. The board shows good EMC performance, EMC
report available for download on the evaluation board webpage.
Intended audience
Hardware engineers, software engineers, system architects
User Manual Please read the Important Notice and Warnings at the end of this document Rev.1.12
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TLD5542-1 Multichannel evalboard V4.5
User Manual
Table of contents
1 Table of contents
About this document ......................................................................................................................... 1
1 Table of contents ...................................................................................................................... 2
2 Glossary .................................................................................................................................. 3
3 Description .............................................................................................................................. 4
4 Quick start procedure ............................................................................................................... 5
5 Possible light scenarios ............................................................................................................. 8
6 Operating range and power derating ......................................................................................... 9
7 Electrical characteristics ..........................................................................................................10
8 Diagnostic ..............................................................................................................................11
9 PCB layout ..............................................................................................................................12
10 Schematic ...............................................................................................................................13
Revision history ...............................................................................................................................16
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2 Glossary
DRL: Daytime Running Light function
POS: position light obtained by dimming down the DRL function
LB: Low Beam function
HB: High Beam function
H-Bridge: 4 switches topology buck-boost DC/DC converter (see Figure 1)
Figure 1 4 switches H-Bridge architecture overview
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3
The TLD5542-1 multichannel evalboard V4.4 it is an evaluation platform for the TLD5542-1, which can drive 3 LED
functions (HB, LB, DRL), with a single efficient DC/DC converter.
In the single DC/DC multichannel system night-time functions (e.g. HB and LB) are connected in series and the
complementary daytime (DRL) function in parallel by mean of switches (Figure 2). The switches properly
distribute the DC/DC converter output current in order to obtain the requested LED currents. This approach is
called multi floating switch (MFS) architecture.
Description
Figure 2 LED driver with 3 functions on MFS architecture
The TLD5542-1 Multichannel evalboard V4.4 has an ePower microcontroller TLE9842-2 pre-programmed with the
application software V4.0 or higher. A PC GUI can configure load currents and duty cycles via USB (UART over
LIN).
Figure 3
TLD5542-1 Multichannel evalboard V4.4
On the board, in addition the following are present:
•
A 300 mA LS switch to drive an external FAN
•
Limp Home push button show fail safe operation
•
Extra push button whose functionality can be programmed by the user
•
LIN interface and a detachable USB serial to LIN daughter board
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4
The TLD5542-1 multichannel evalboard comes with USB to LIN daughter board, avoid detaching it from the
main board in order to be able to control the board via USB.
Humming noise may be heard from the board due to piezoelectric effect on output capacitors, this does not
affect the performance.
Step by step procedure
1.
Connect the load(s) to the HB, LB, DRL connectors as shown in Figure 4 , the software will automatically
disable unconnected terminals
Quick start procedure
Figure 4 TLD5542-1 Multichannel evalboard V4.4 - connect loads
2.
Connect a 12 V 5 A power supply to the VIN connector
Figure 5 TLD5542-1 Multichannel evalboard V4.4 - connect power supply
3.
Load will be powered with Default configuration:
LB 1000 mA, HB 800 mA , POS 28 mA (400 mA @ 7%)
4.
In order to control the TLD5542-1 Multichannel evalboard, install the GUI V1.0 to the control PC (chapter
Error! Reference source not found.)
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