Copyright © Infineon Technologies 2010. All rights reserved.

 Short presentation of Infineon and DC Padova
 Lighting challenge: color mixing
 Solution developed in Padova:
- LinLed Driver for color mixing (TLD7306, ILD3395)
- Multi-Topology DCDC Controller (TLD5098 / ILD1151)
Copyright © Infineon Technologies 2011. All rights reserved. 13/10/2011 G.Chiozzi Page 2

every car on the planet in avg. has 7 chips by Infineon
 Spin off from Siemens in 1999
 25,149 employees worldwide (as of July 2011)
 3.295 billion EUR revenue 2010*
 Strong technology portfolio with about 15.400 patents
 20 major R&D locations
 12 major manufacturing sites
 Focus on areas with growing economic and social relevance:
Energy Efficiency Mobility Security
*Note: Figures according to IFRS with Wireline and Wireless as discontinued operations; as of September 30, 2010
G.Chiozzi, Oct 2011 Copyright © Infineon Technologies 2010. All rights reserved. Page 3

 founded in 2001 by 10 design engineers
 located close to Padova city centre and University
 about 100 engineers , mostly electronic engineers
 facility area of 2000m 2 , 120 w.p., 6 laboratories, 2 tester rooms
 in last 10 years, active on development of
 automotive & industrial power electronics
 automotive microcontrollers (eFlash, PRE)
 stand alone flash memories (NOR, twin bit)
 industrial drives
 supply systems for CPU in desktop and notebook
 more than 160 chips developed
 more than 140 patents proposals filed
G.Chiozzi, Oct2011 Copyright © Infineon Technologies 2010. All rights reserved.

Oct 2011 G.Chiozzi Copyright © Infineon Technologies 2010. All rights reserved. Page 5

13.10.2011 Copyright © Infineon Technologies 2010. All rights reserved.

Wavelength
100Hz
?
3000Hz
Copyright © Infineon Technologies 2010. All rights reserved. Page 7 Oct 2011 G.Chiozzi

Eye relative sensitivity ultraviolett infrared
Wavelength (nm)
 RGB lumunous intensity must balance human eye’s sensitivity
 LED Binning spreads must be compensated, too!
Oct 2011 G.Chiozzi
Copyright © Infineon Technologies 2011. All rights reserved.

 For some populations visible or invisible flicker can be a trigger for headaches, migraines, fatigue, epilepsy, and other neurological responses.
 In “steady state” the human eye behave similar to a LPF with cut off freq=90Hz, although biological effects apply up to 200Hz.
 In “fast moving” conditions, flickering is perceived up to 3KHz, effects on health are unknown yet.
 IEEE PAR1789 "Recommending practices for modulating current in High
Brightness LEDs for mitigating health risks to viewers" has been formed to advise the lighting industry and standards groups about the emerging concern of flicker in LED lighting. visible flicker (steady) flicker not visible
(steady)
Bio effects intrasaccadic flicker
(rapid movement)
NO FLICKER ZONE
Oct 2011 G.Chiozzi
CFF = 90Hz
CFF=Critical flicker fusion
200Hz 3KHz
CFF=Critical flicker fusion
(*) ECCE2011, Brad Lehman et al., Department of Electrical & Computer Engineering, Northeastern University, Boston MA Page 9

 Color mixing by PWM modulation is engineer’s first choice, but also included in some patents like US 6016038
 EP2230885B1 “Sigma Delta Current source and LED Driver” is a proprietary solution for color mixing by PDM modulation !
Use of PDM to drive RGB LEDs Sigma-Delta modulator
Oct 2011 G.Chiozzi

Color mixing: schematic of Sigma-Delta modulator and compensation of distortions
Sigma-Delta with cascaded LED Driver stage Sigma-Delta with feedback LED Driver stage
Simple analogue realisation
Oct 2011 G.Chiozzi

Smart LED module with Infineon ® LIN LED Driver
TLD7306, ILD3395
 Operating supply voltage: 4.8V … 34V, Freq=200KHz

3 x 48mA, integrated current sources output stages
 LIN SAE J2602 or LIN 2.1 or SPI interface
 16 color points can be stored in the integrated NVM
 Theater dimming effects and smooth color transitioning

PDM proprietary modulation

Overload protection and under voltage detection
 High current driving by use of external power transistors
Oct 2011 G.Chiozzi Page 12
LED Module with 3 connections only!
Only 2 capacitors and 1 resistor required!
Copyright © Infineon Technologies 2010. All rights reserved.

Smart LED module – decentralized control with
Infineon ® LIN LED Driver IC as Predriver TLD739xEK
 Differences to TLD730xEK
 3 channel highside current sources as predriver for npn-transistors
 Non volatile memory for
 4 sense voltage levels programmable (120, 240, 360, 480mV)
Vs
LIN bus
50
W
Internal
Supply
VS
100nF
LIN
220pF LIN transceiver
Logic
NVM Storage for sets of output currents
VS
Output control
Output stages
PWR1
SENSE1
PWR2
SENSE2
PWR3
SENSE3
BCX55-16
1
W
BCX55-16
1
W
GND
GND BCX55-16
1
W
09.09.2011 Copyright © Infineon Technologies 2010. All rights reserved. Page 14

Smart
LED
Module
Central
Control
Module
µC
Control
Feedback
AC/DC
Converter
Supply
Central
Control
Module
Smart
LED
Module
Smart
LED
Module
Smart
LED
Module
Smart
LED
Module
Smart
LED
Module
 No additional Control Module required
 RGB-modules in parallel
 Simple extension
 Reduced wiring effort
 Ready to mount shipped LED module
09.09.2011
Smart
LED
Module
Page 15
LIN-
Transceiver
LIN Bus Supply
Vs
LIN bus
GND
50
W
Driver IC
Supply
VS
100nF
LIN
220pF LIN transceiver
GND
Logic
NVM Storage for sets of output currents
Output stages
Output control
OUT1
OUT2
OUT3
GND