RF & Protection Devices
Data Sheet
Revision 1.0, 2010-11-11
ILD4035
350 mA LED Driver
ILD4035
Edition 2010-11-11
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2010 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, 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.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support
devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may
be endangered.
ILD4035
350 mA LED Driver
Data Sheet 3 Revision 1.0, 2010-11-11
Trademarks of Infineon Technologies AG
AURIX™, BlueMoon™, C166™, CanPAK™, CIPOS™, CIPURSE™, COMNEON™, EconoPACK™, CoolMOS™,
CoolSET™, CORECONTROL™, CROSSAVE™, DAVE™, EasyPIM™, EconoBRIDGE™, EconoDUAL™,
EconoPIM™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™, ISOFACE™, IsoPACK™,
MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OmniTune™, OptiMOS™, ORIGA™, PRIMARION™,
PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™, SIEGET™,
SINDRION™, SIPMOS™, SMARTi™, SmartLEWIS™, SOLID FLASH™, TEMPFET™, thinQ!™,
TRENCHSTOP™, TriCore™, X-GOLD™, X-PMU™, XMM™, XPOSYS™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR
development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™,
FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG.
FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of
Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™ of Infrared Data
Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of
MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics
Corporation. Mifare™ of NXP. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™
of MURATA MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc.,
OmniVision™ of OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc.
RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc.
SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden
Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA.
UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™
of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of
Diodes Zetex Limited.
Last Trademarks Update 2010-10-26
Revision History
Page or Item Subjects (major changes since previous revision)
Revision 1.0, 2010-11-11
<Revision X.Y>, <yyyy-mm-dd>
ILD4035
350 mA LED Driver
Table of Contents
Data Sheet 4 Revision 1.0, 2010-11-11
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3Product Brief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Digital Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Basic Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Setting the average LED current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Dimming of the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Temperature Characteristics of the ILD4035 Demo Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4 AC- Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6 Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8 Package Information SC74-6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table of Contents
ILD4035
350 mA LED Driver
List of Figures
Data Sheet 5 Revision 1.0, 2010-11-11
Figure 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 2 ILD4035; Total Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3 ILD4035; Safe Operating Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4 ILD4035; Rsense Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 5 ILD4035; Analog Voltage Dimming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 6 ILD4035; Analog Voltage Dimming with Different Rsense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7 ILD4035; PWM Dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8 ILD4035; Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 9 ILD4035; Evaluation- Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 10 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 11 Tape Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
List of Figures
ILD4035
350 mA LED Driver
List of Tables
Data Sheet 6 Revision 1.0, 2010-11-11
Table 1 Pin Definition and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2 Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 3 Maximum Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4 DC Characteristics at TA = 25 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5 AC Characteristics at TA = 25 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 6 AC Characteristics, VCE = 3 V, f = 150 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7 Percentage of Max. LED Current vs. DC Voltage at Pin 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
List of Tables
3
2
1
4
5
6
Product Name Package Pin Configuration Marking
ILD4035 SC74-6-4 35
350 mA LED Driver with Internal Switch
ILD4035
Data Sheet 7 Revision 1.0, 2010-11-11
1 Features
• Wide input voltage range: 4.5 V ... 42 V
• Internal switch
• 350 mA LED output current
• Over current protection
• Over voltage protection
• Reversible temperature shut down mechanism
• Inherent open- circuit LED protection
• Soft- start capability
• Low shut down current < 100 nA in operating voltage range
• Analog voltage and PWM dimming possible
• Typical 3% output current accuracy
• Very low LED current drift over temperature
• Minimum external components required
• Small Package: SC74
2 Applications
• LED Driver for general lighting applications
• Indoor illumination, residential lighting
• Outdoor illumination, street lighting
• Office lighting, downlights
• Architectural lighting
ILD4035
350 mA LED Driver
Product Brief
Data Sheet 8 Revision 1.0, 2010-11-11
3 Product Brief
The ILD4035 is a hysteretic Step down LED converter IC for general lighting applications, which is capable to drive
high power LEDs with currents up to 350 mA.
The IC incorporates a wide input voltage range and an internal power switch. The output current level can be
adjusted with an external sense resistor.
According to the multifunctional control pin the IC can be switched on and off by an external signal, which is also
suitable to regulate brightness of the LEDs by PWM or analog voltage dimming.
Depending on the value of the switching inductor the switching frequency and the voltage ripple can be set.
The precise internal bandgap stabilizes the circuit and provides stable current conditions over temperature range.
To ensure a long lifetime of the LED system, the ILD4035 incorporates an overvoltage and an overcurrent
protection.
In addition, the integrated thermal shutdown will protect the LEDs and the IC against thermal stress.
Figure 1 Block Diagram
ILD4035_Block diagram.vsd
6
5
4
3
2
1
Vs
GND
EN/
PWM
Isense
GND
Vswitch
ILD4035
Buck LED Converter
I / V
Vref
Vstab Vstab
Vstab
Vstab Vstab
Pflaum
Over Current Protection
TSD
Over Voltage Protection
ILD4035
350 mA LED Driver
Product Brief
Data Sheet 9 Revision 1.0, 2010-11-11
Pin Definition
Maximum Ratings
Thermal Resistance
Table 1 Pin Definition and Function
Pin Number Pin Symbol Function
1VsSupply Voltage
2GND IC ground
3EN / PWM Multifunctional Pin; Power On control voltage pin (PWM input)
4Vswitch Power Switch Output
5GND IC ground
6Isense LED current sense pin
Table 2 Maximum Ratings
Parameter Symbol Limit Value Unit
Supply voltage Vs 45 V
Peak Output current Iout 600 mA
Total Power Dissipation; Ts= 85°C Ptot 1000 mW
Junction temperature TJ 125 °C
Solder Temperature of GND pins TSGND 110 °C
Storage temperature range TSTG -65... 150 °C
ESD capability all pins1)
1) Refer to HBM: JESD22 - A114
VESD_HBM 4kV
Table 3 Maximum Thermal Resistance
Parameter Symbol Value Unit
Junction - solder point RthJS 65 K/W
ILD4035
350 mA LED Driver
Product Brief
Data Sheet 10 Revision 1.0, 2010-11-11
Figure 2 ILD4035; Total Power Dissipation
This formula is a first estimation to calculate the Power Dissipation of the IC
Ptot = 1.1 V * ILED * duty cycle + FOSC * 1μW * ILED / 350mA (1)
For more precise analysis please measure TS of ILD4035 at GND pin and use Figure 2 as a reference.
Figure 3 ILD4035; Safe Operating Area
This diagram shows the area of safe operation for the respective inductance values.
Total Power Dissipation Ptot = f (T
J
)
0
0.2
0.4
0.6
0.8
1
1.2
0 20 40 60 80 100 120 140
T
J
(°C)
Ptot (W)
Safe Operating Area- Diagram
0
5
10
15
20
25
30
35
40
45
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
Average LED current (A)
Vs - V
LED
(V)
47µH
68µH
100µH
150µH
220µH
330µH
SOA
ILD4035
350 mA LED Driver
Product Brief
Data Sheet 11 Revision 1.0, 2010-11-11
The safe area of operation consists of the minimum and maximum allowed average LED current and the resulting
voltage overhead.
The voltage overhead is the difference between the sum of the LED forward voltages and the supply voltage.
Example Calculation 1
3 LEDs in series; ILED = 350 mA; VS = 12 V
Voverhead = VS - VfLED = 12 V - 9 V = 3 V
=> every coil value could be used
Example Calculation 2
6 LEDs in series;
ILED = 250 mA; VS = 24 V
Voverhead = VS - VfLED = 24 V - 18 V = 6 V
=> the coil values should be equal or above 100 uH
If Voverhead is above the boundary of a certain coil value at wanted average LED current, the switching frequency
and the associated power dissipation of the ILD4035 will increase beyond maximum ratings.
ILD4035
350 mA LED Driver
Electrical Characteristics
Data Sheet 12 Revision 1.0, 2010-11-11
4 Electrical Characteristics
4.1 DC Characteristics
All voltages with respect to ground; positive; current flowing into pin; unless otherwise specified
All parameters have been measured at Tamb = 25 °C, unless otherwise specified.
Ven = 3 V
Table 4 DC Characteristics at TA = 25 °C
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Supply voltage Vs 4.5 42 V
Overall current consumption open
load
Isopen load 2.1 2.7 3.5 mA Vs=4.5V
ILED =0mA
Overall current consumption open
load
Isopen load 2.7 3.5 4.3 mA Vs=40V
ILED =0mA
Overall current consumption open
load
Isopen load 2.0 8.4 13.0 mA Vs=45V
ILED =0mA
Overall standby current consumption Isstandby 1000 nA Ven = 0 V; Vs= 12 V
Overall standby current consumption Isstandby 50 μAVen = 0 V; Vs = 40 V
Input Current of multifunctional control
pin
IEN 140 200 μAVen =3 V
VS= 4.5..42 V
Current of Sense input Isense 20 μA At any LED current
Temperature shut down ThTSD1)
1) This specified value corresponds to solder temperature when the IC goes into shut down mode.
Operating ambient temperature depends on RthSA of the PCB.
85 90 95 °C Iout -> 0 A;
value refers to TS
under condition
Vs= 12 V; 3 LEDs
L = 100 μH;
Rsense =333mΩ
ILD4035
350 mA LED Driver
Electrical Characteristics
Data Sheet 13 Revision 1.0, 2010-11-11
4.2 AC Characteristics
All parameters have been measured at Tamb = 25 °C, unless otherwise specified.
Vs = 12 V, VfLED = 3 V
Rsense = 333 mΩ −> ILED =350mA
Ven = 3 V
L = 100 μH, unless otherwise specified
4.3 Digital Signals
All parameters have been measured at Tamb = 25 °C, unless otherwise specified.
Table 5 AC Characteristics at TA = 25 °C
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Mean current sense threshold voltage ΔVsense 115 118 121 mV 3 LEDs in series
verified by sample test
Switching frequency Fsw 180 kHz 3 LEDs in series
Maximum switching frequency Fswmax 500 kHz Recommended,
depends on coil value
Sense threshold hysteresis Vsensehys +/- 7.5 % Not subject to production
test - verified by
design/characteri-zation
Residual voltage at collector of power
transistor
VCE 1.1 V Internal power transistor
is switched on
Output current accuracy IoutaccVs +/- 3 % 3 LEDs in series
not subject to production
test - verified by
design/characteri-zation
Temperature drift of average
LED current
IdriftTemp + 3 % 3 LEDs in series
TJ: 70 -> 110 °C
not subject to production
test - verified by
design/characteri-zation
Table 6 AC Characteristics, VCE = 3 V, f = 150 MHz
Parameter Symbol Values Unit Note / Test Condition
Min. Typ. Max.
Multifunctional control pin voltage
range
UPon -0.3 42 V
Control voltage for power on UOn 2.2 2.5 42 V Full LED current
Control voltage for power off UOff -0.3 0.7 V
Control voltage for analog dimming Udim 1 2.5 V Linear dimming range
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 14 Revision 1.0, 2010-11-11
5 Basic Application Information
This section covers the basic information required for calculating the parameters for a certain LED application.
For detailed application information please check the Application Note AN215 (Driving 1 W LEDs with ILD4035)
or visit our web site http://www.infineon.com/led.appnotes
5.1 Setting the average LED current
The average output current for the LEDs is set by the external sense resistor Rsense. To calculate the value of this
resistor, a first approximation can be calculated using this formula.
The Vsense is dependent on the supply voltage Vs and the number of LEDs in series.
Figure 4 ILD4035; Rsense Calculation
Example Calculation 1
Vs = 12 V, VfLED = 3 V, 3 LEDs in series
=> Vsense = 118 mV
ILED = 350 mA
=> Rsense = 337 mΩ
Example Calculation 2
Vs = 24 V, VfLED = 3 V, 6 LEDs in series
=> Vsense = 100 mV
ILED = 350 mA
=> Rsense = 286 mΩ
An easy way to achieve these resistor values is to connect standard resistors in parallel
5.2 Dimming of the LEDs
Typical operating conditions
All parameters have been measured at Tamb = 25 °C, unless otherwise specified.
Analog voltage dimming
The analog dimming characteristic graph is shown in Figure 5. To achieve a linear change in LED current versus
control voltage, the recommended range of voltage at En/PWM pin 3 is from 0.8 V to 2.5 V
Rsense = 333 mΩ, L= 100 μH
LED
sense
sense
I
V
R=
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 15 Revision 1.0, 2010-11-11
Figure 5 ILD4035; Analog Voltage Dimming
Analog voltage dimming characteristics with different Rsense resistors
The maximum LED current is set by Rsense. The three different graphs show the behaviour of the analog dimming.
Maximum LED current will be achieved at approx. 2.3 Volts in every case.
L= 100 μH
Figure 6 ILD4035; Analog Voltage Dimming with Different Rsense
Table 7 Percentage of Max. LED Current vs. DC Voltage at Pin 3
Ven / PWM Percentage of max. LED current % Ven / PWM Percentage of max. LED current %
< 0.3 0 1.9 75
0.8 10 2.2 90
1.0 25 > 2.5 100
1.4 50
Analog Dimming vs LED Current
Vs=12V; 3 LEDs in series
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0 0.5 1 1.5 2 2.5 3
Enable Voltage (V)
I_LED (A)
TA=25°C
I
LED
vs V
PWM
in dependency of Rsense
L = 100uH
0.000
0.050
0.100
0.150
0.200
0.250
0.300
0.350
0.400
0.511.522.53
V
PWM
(V)
I
LED
(A)
Rsense=333m
Rsense=600m
Rsense=1200m
ILD4035_Analog Dimming _vs_Rsense.vsd
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 16 Revision 1.0, 2010-11-11
PWM Dimming
The EM/PWM terminal on the PCB is an input for the pulse width modulated (PWM) signal to control the dimming
of the LED string. The PWM signal's logic high level should be at least 2.6 V or higher. The period of this PWM
signal should be higher than 200 us. For the default demo board circuit, a dimming frequency less than 300 Hz is
recommended to maintain a maximum contrast ratio of at least 100:1. The maximum contrast ratio is shown on
Figure 7, and the minimum is based on the measured average LED current at 3dB below the linear reference. The
maximum contrast ratio depends largely on the rise time of the inductor current, and hence is dependent on input
voltage, inductor size, and LED string forward voltage.
Figure 7 ILD4035; PWM Dimming
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 17 Revision 1.0, 2010-11-11
5.3 Temperature Characteristics of the ILD4035 Demo Board
The two charts below are related by the same supply voltage, Vs and number of LEDs.
For the same Vs and number of LEDs, the "solder point temperature at the ground pin" Ts and the "ambient
temperature" TA are measured at the same time.
Each curve on the charts defines two areas of operation.
The area below each curve defines normal operation.
The area above each curve defines the triggering of internal thermal shutdown.
When thermal shutdown is triggered, the LEDs start to flicker.
Conditions of Measurements
ILD4035 LED-Less board with
BAS3010A Schottky Diode,
Inductance=100uH (EPCOS 6x6mm)
Rsense=0.333 Ohm
Environment = Inside chamber with force convection air flow.
Thermal shutdown vs. solder temperature TSThermal shutdown vs. ambient temperature TA
ILD4035_TSD_over_Ts.vsd
Thermal Shut Dow n Curve - Soldering Temperature
0
5
10
15
20
25
30
35
40 50 60 70 80 90
Ts (C)
Vs (V)
3 LEDs 4 LEDs 5 LEDs 6 LEDs
ILD4035_TSD_over_Ta.vsd
Thermal Shut Dow n Curve - Ambient Temperature
0
5
10
15
20
25
30
35
30 40 50 60 70 80
Ta (C)
Vs (V)
3 LEDs 4 LEDs 5 LEDs 6 LEDs
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 18 Revision 1.0, 2010-11-11
5.4 AC- Parameter
Typical operating conditions
All parameters have been measured at Tamb = 25 °C, unless otherwise specified.
ILD4035 IC has been measured in test bench with undefined high thermal resistance
This is valid for all diagramed AC- Parameters.
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 19 Revision 1.0, 2010-11-11
Rsense = 303 mΩ, L= 100 μH
Vs = 24 V, 6 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_303m_100u.vsd
ILED (Rs=303m; L=100uH)
0.250
0.275
0.300
0.325
0.350
0.375
0.400
0.425
0.450
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_303m_ 100u.vsd
Switching Frequency (Rs=303m; L=100uH)
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_303m_100u.vsd
Efficiency (Rs=303m; L=100uH)
60
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_303m_ 100u.vsd
Duty Cycle (Rs=303m; L=100uH)
20%
30%
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 20 Revision 1.0, 2010-11-11
Rsense = 303 mΩ, L= 68 μH
Vs = 24 V, 6 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_303m_68u.vsd
ILED (Rs=303m; L=68uH)
0.250
0.275
0.300
0.325
0.350
0.375
0.400
0.425
0.450
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_303m_68u.vsd
Switching Frequency (Rs=303m; L=68uH)
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_303 m_68u.vsd
Efficiency (Rs=303m; L=68uH)
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_303m_68u.vsd
Duty Cycle (Rs=303m; L=68uH)
30%
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 21 Revision 1.0, 2010-11-11
Rsense = 303 mΩ, L= 220 μH
Vs = 24 V, 6 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_303m_220u.vsd
ILED (Rs=303m; L=220uH)
0.250
0.275
0.300
0.325
0.350
0.375
0.400
0.425
0.450
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_303m_220u.vsd
Switching Frequency (Rs=303m; L=220uH)
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_303m_ 220u.vsd
Efficiency (Rs=303m; L=220uH)
60
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_ Cycle_303 m_220u.vsd
Duty Cycle (Rs=303m; L=220uH)
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 22 Revision 1.0, 2010-11-11
Rsense = 303 mΩ, L= 47 μH
Vs = 24 V, 6 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_303m_47u.vsd
ILED (Rs=303m; L=47uH)
0.250
0.275
0.300
0.325
0.350
0.375
0.400
0.425
0.450
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_303m_47u.vsd
Switching Frequency (Rs=303m; L=47uH)
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_303 m_47u.vsd
Efficiency (Rs=303m; L=47uH)
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_303m_47u.vsd
Duty Cycle (Rs=303m; L=47uH)
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 23 Revision 1.0, 2010-11-11
Rsense = 367 mΩ, L= 100 μH
Vs = 24 V, 6 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_367m_100u.vsd
ILED (Rs=367m; L=100uH)
0.200
0.225
0.250
0.275
0.300
0.325
0.350
0.375
0.400
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_367m_100u.vsd
Switching Frequency (Rs=367m; L=100uH)
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5.00E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_367m_100u.vsd
Efficiency (Rs=367m; L=100uH)
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_367m_ 100u.vsd
Duty Cycle (Rs=367m; L=100uH)
20%
30%
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 24 Revision 1.0, 2010-11-11
Rsense = 367 mΩ, L= 68 μH
Vs = 12 V, 3 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_367m_68u.vsd
ILED (Rs=367m; L=68uH)
0.200
0.225
0.250
0.275
0.300
0.325
0.350
0.375
0.400
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_367m_68u.vsd
Switching Frequency (Rs=367m; L=68uH)
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5.00E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_367 m_68u.vsd
Efficiency (Rs=367m; L=68uH)
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_367m_68u.vsd
Duty Cycle (Rs=367m; L=68uH)
30%
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 25 Revision 1.0, 2010-11-11
Rsense = 367 mΩ, L= 220 μH
Vs = 12 V, 3 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_Switching_Frequency_367m_220u.vsd
Switching Frequency (Rs=367m; L=220uH)
5.00E+04
1.00E+05
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5.00E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_367m_220u.vsd
Efficiency (Rs=367m; L=220uH)
60
65
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_367m_ 220u.vsd
Duty Cycle (Rs=367m; L=220uH)
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Basic Application Information
Data Sheet 26 Revision 1.0, 2010-11-11
Rsense = 367 mΩ, L= 47 μH
Vs = 12 V, 3 LED with typ. VF = 3 V
ILED vs. VSupply and number of LEDs FSwitch vs. VSupply and number of LEDs
Efficiency vs. VSupply and number of LEDs Duty Cycle vs. VSupply and number of LEDs
ILD4035_ILED_367m_47u.vsd
ILED (Rs=367m; L=47uH)
0.200
0.225
0.250
0.275
0.300
0.325
0.350
0.375
0.400
5 1015202530354045
Vs (V)
I
LED
(A)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Switching_Frequency_367m_47u.vsd
Switching Frequency (Rs=367m; L=47uH)
1.50E+05
2.00E+05
2.50E+05
3.00E+05
3.50E+05
4.00E+05
4.50E+05
5.00E+05
5 1015202530354045
Vs (V)
Switching Frequency (Hz)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Efficiency_367 m_47u.vsd
Efficiency (Rs=367m; L=47uH)
70
75
80
85
90
95
100
5 1015202530354045
Vs (V)
Efficiency (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035_Duty_Cycle_367m_47u.vsd
Duty Cycle (Rs=367m; L=47uH)
40%
50%
60%
70%
80%
90%
100%
5 1015202530354045
Vs (V)
Duty Cycle (%)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
11LED
ILD4035
350 mA LED Driver
Application Circuit
Data Sheet 27 Revision 1.0, 2010-11-11
6 Application Circuit
Figure 8 ILD4035; Application Circuit
ILD4035_Application circuit.vsd
EN / PWM
Vs
6
5
4
3
2
1
I / V
Vref
Vstab Vref
Vstab
Vstab Vstab
Pflaum
TSD
ILD4035
Rsense
ILD4035
350 mA LED Driver
Evaluation Board
Data Sheet 28 Revision 1.0, 2010-11-11
7 Evaluation Board
Figure 9 ILD4035; Evaluation- Board
8 Package Information SC74-6-4
Figure 10 Package Outline
Figure 11 Tape Dimensions
ILD4035_Eval_Board .vsd
GPX09300
1.6
±0.1
±0.1
2.5
±0.1
0.25
1.1 MAX.
0.1 MAX.
(2.25)
+0.1
-0.05
0.35
(0.35)
10
˚
MAX.
10
˚
MAX.
2.9
±0.2
B
0.2
M
B6x
0.95
1.9
A
0.2 A
M
0.15
+0.1
-0.06
321
456
2.7
4
3.15
Pin 1
marking CPWG5899
8
0.2
1.15
Published by Infineon Technologies AG
www.infineon.com