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ILD4035
350 mA LED Driver
ILD4035
Data Sheet
Revision 1.0, 2010-11-11
RF & Protection Devices
Edition 2010-11-11 Published by Infineon Technologies AG 81726 Munich, Germany (c) 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
Revision History Page or Item Subjects (major changes since previous revision) Revision 1.0, 2010-11-11
,
Trademarks of Infineon Technologies AG AURIXTM, BlueMoonTM, C166TM, CanPAKTM, CIPOSTM, CIPURSETM, COMNEONTM, EconoPACKTM, CoolMOSTM, CoolSETTM, CORECONTROLTM, CROSSAVETM, DAVETM, EasyPIMTM, EconoBRIDGETM, EconoDUALTM, EconoPIMTM, EiceDRIVERTM, eupecTM, FCOSTM, HITFETTM, HybridPACKTM, IRFTM, ISOFACETM, IsoPACKTM, MIPAQTM, ModSTACKTM, my-dTM, NovalithICTM, OmniTuneTM, OptiMOSTM, ORIGATM, PRIMARIONTM, PrimePACKTM, PrimeSTACKTM, PRO-SILTM, PROFETTM, RASICTM, ReverSaveTM, SatRICTM, SIEGETTM, SINDRIONTM, SIPMOSTM, SMARTiTM, SmartLEWISTM, SOLID FLASHTM, TEMPFETTM, thinQ!TM, TRENCHSTOPTM, TriCoreTM, X-GOLDTM, X-PMUTM, XMMTM, XPOSYSTM. Other Trademarks Advance Design SystemTM (ADS) of Agilent Technologies, AMBATM, ARMTM, MULTI-ICETM, KEILTM, PRIMECELLTM, REALVIEWTM, THUMBTM, VisionTM of ARM Limited, UK. AUTOSARTM is licensed by AUTOSAR development partnership. BluetoothTM of Bluetooth SIG Inc. CAT-iqTM of DECT Forum. COLOSSUSTM, FirstGPSTM of Trimble Navigation Ltd. EMVTM of EMVCo, LLC (Visa Holdings Inc.). EPCOSTM of Epcos AG. FLEXGOTM of Microsoft Corporation. FlexRayTM is licensed by FlexRay Consortium. HYPERTERMINALTM of Hilgraeve Incorporated. IECTM of Commission Electrotechnique Internationale. IrDATM of Infrared Data Association Corporation. ISOTM of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLABTM of MathWorks, Inc. MAXIMTM of Maxim Integrated Products, Inc. MICROTECTM, NUCLEUSTM of Mentor Graphics Corporation. MifareTM of NXP. MIPITM of MIPI Alliance, Inc. MIPSTM of MIPS Technologies, Inc., USA. muRataTM of MURATA MANUFACTURING CO., MICROWAVE OFFICETM (MWO) of Applied Wave Research Inc., OmniVisionTM of OmniVision Technologies, Inc. OpenwaveTM Openwave Systems Inc. RED HATTM Red Hat, Inc. RFMDTM RF Micro Devices, Inc. SIRIUSTM of Sirius Satellite Radio Inc. SOLARISTM of Sun Microsystems, Inc. SPANSIONTM of Spansion LLC Ltd. SymbianTM of Symbian Software Limited. TAIYO YUDENTM of Taiyo Yuden Co. TEAKLITETM of CEVA, Inc. TEKTRONIXTM of Tektronix Inc. TOKOTM of TOKO KABUSHIKI KAISHA TA. UNIXTM of X/Open Company Limited. VERILOGTM, PALLADIUMTM of Cadence Design Systems, Inc. VLYNQTM of Texas Instruments Incorporated. VXWORKSTM, WIND RIVERTM of WIND RIVER SYSTEMS, INC. ZETEXTM of Diodes Zetex Limited. Last Trademarks Update 2010-10-26
Data Sheet
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ILD4035 350 mA LED Driver
Table of Contents
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1 2 3 4 4.1 4.2 4.3 5 5.1 5.2 5.3 5.4 6 7 8 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Product Brief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the average LED current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimming of the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Characteristics of the ILD4035 Demo Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC- Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12 13 13 14 14 14 17 18
Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Package Information SC74-6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Data Sheet
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ILD4035 350 mA LED Driver
List of Figures
List of Figures
Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ILD4035; Total Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ILD4035; Safe Operating Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ILD4035; Rsense Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ILD4035; Analog Voltage Dimming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 ILD4035; Analog Voltage Dimming with Different Rsense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 ILD4035; PWM Dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 ILD4035; Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ILD4035; Evaluation- Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Tape Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Data Sheet
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ILD4035 350 mA LED Driver
List of Tables
List of Tables
Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Pin Definition and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Maximum Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DC Characteristics at TA = 25 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AC Characteristics at TA = 25 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 AC Characteristics, VCE = 3 V, f = 150 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Percentage of Max. LED Current vs. DC Voltage at Pin 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Data Sheet
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350 mA LED Driver with Internal Switch ILD4035
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
4 5 6 1 2
3
2
* * * * *
Applications
LED Driver for general lighting applications Indoor illumination, residential lighting Outdoor illumination, street lighting Office lighting, downlights Architectural lighting
Product Name ILD4035 Data Sheet
Package SC74-6-4 7
Pin Configuration
Marking 35 Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Product Brief
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.
ILD4035 Buck LED Converter
Vs 1
Vstab
Vstab
6
Isense
I/V
Over Voltage Protection
GND
2
TSD
Vref
Vstab Vstab Vstab
5
GND
EN/ PWM
3
Over Current Protection Pflaum
4
Vswitch
ILD4035_ Block diagram.vsd
Figure 1
Block Diagram
Data Sheet
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ILD4035 350 mA LED Driver
Product Brief Pin Definition Table 1 Pin Number 1 2 3 4 5 6 Maximum Ratings Table 2 Parameter Supply voltage Peak Output current Total Power Dissipation; Ts= 85C Junction temperature Solder Temperature of GND pins Storage temperature range ESD capability all pins
1)
Pin Definition and Function Pin Symbol Function Supply Voltage IC ground Multifunctional Pin; Power On control voltage pin (PWM input) Power Switch Output IC ground LED current sense pin
Vs
GND EN / PWM
Vswitch
GND
Isense
Maximum Ratings Symbol Limit Value 45 600 1000 125 110 -65... 150 4 Unit V mA mW C C C kV
Vs
Iout
Ptot TJ TSGND TSTG VESD_HBM
1) Refer to HBM: JESD22 - A114
Thermal Resistance Table 3 Parameter Junction - solder point Maximum Thermal Resistance Symbol Value 65 Unit K/W
RthJS
Data Sheet
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ILD4035 350 mA LED Driver
Product Brief
Total Power Dissipation Ptot = f (TJ)
1.2 1 0.8 Ptot (W) 0.6 0.4 0.2 0 0 20 40 60 TJ (C) 80 100 120 140
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 * 1W * ILED / 350mA
For more precise analysis please measure TS of ILD4035 at GND pin and use Figure 2 as a reference.
(1)
Safe Operating Area- Diagram
45
40
35
30 47H 68H 100H 150H 220H 330H Vs - V LED (V)
25
20
15
10
5 SOA 0 0.05
0.1
0.15
0.2
0.25 Average LED current (A)
0.3
0.35
0.4
0.45
Figure 3
ILD4035; Safe Operating Area
This diagram shows the area of safe operation for the respective inductance values. Data Sheet 10 Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Product Brief 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.
Data Sheet
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ILD4035 350 mA LED Driver
Electrical Characteristics
4
4.1
Electrical Characteristics
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 Parameter Supply voltage Overall current consumption open load Overall current consumption open load Overall current consumption open load Overall standby current consumption Overall standby current consumption DC Characteristics at TA = 25 C Symbol Min. Values Typ. 2.7 3.5 8.4 Max. 42 3.5 4.3 13.0 1000 50 140 20 85 90 95 200 V mA mA mA nA A A A C 4.5 2.1 2.7 2.0 Unit Note / Test Condition
Vs Isopen load Isopen load Isopen load Isstandby Isstandby
Vs = 4.5 V ILED = 0 mA Vs = 40 V ILED = 0 mA Vs = 45 V ILED = 0 mA Ven = 0 V; Vs= 12 V Ven = 0 V; Vs = 40 V Ven =3 V VS = 4.5..42 V
At any LED current
Input Current of multifunctional control IEN pin Current of Sense input Temperature shut down
Isense Th
1) TSD
Iout -> 0 A; value refers to TS under condition Vs = 12 V; 3 LEDs L = 100 H; Rsense = 333 m
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.
Data Sheet
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ILD4035 350 mA LED Driver
Electrical Characteristics
4.2
AC Characteristics
All parameters have been measured at Tamb = 25 C, unless otherwise specified.
Vs = 12 V, VfLED = 3 V Rsense = 333 m -> ILED = 350 mA Ven = 3 V
L = 100 H, unless otherwise specified Table 5 Parameter AC Characteristics at TA = 25 C Symbol Min. Mean current sense threshold voltage Vsense Switching frequency Maximum switching frequency Sense threshold hysteresis 115 Values Typ. 118 180 500 +/- 7.5 Max. 121 mV kHz kHz % 3 LEDs in series verified by sample test 3 LEDs in series Recommended, depends on coil value Not subject to production test - verified by design/characteri-zation Internal power transistor is switched on 3 LEDs in series not subject to production test - verified by design/characteri-zation 3 LEDs in series Unit Note / Test Condition
Fsw Fswmax Vsensehys
Residual voltage at collector of power VCE transistor Output current accuracy
1.1 +/- 3
V %
IoutaccVs
Temperature drift of average LED current
IdriftTemp
+3
%
TJ : 70 -> 110 C
not subject to production test - verified by design/characteri-zation
4.3
Digital Signals
All parameters have been measured at Tamb = 25 C, unless otherwise specified. Table 6 Parameter Multifunctional control pin voltage range Control voltage for power on Control voltage for power off AC Characteristics, VCE = 3 V, f = 150 MHz Symbol Min. Values Typ. Max. 42 2.5 42 0.7 2.5 V V V V Linear dimming range Full LED current -0.3 2.2 -0.3 1 Unit Note / Test Condition
UPon UOn UOff
Control voltage for analog dimming Udim
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information
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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.
Rsense =
Figure 4 ILD4035; Rsense Calculation
Vsense I LED
Example Calculation 1
Vs = 12 V, VfLED = 3 V, 3 LEDs in series => Vsense = 118 mV ILED = 350 mA => Rsense = 337 m
Example Calculation 2
Vs = 24 V, VfLED = 3 V, 6 LEDs in series => Vsense = 100 mV ILED = 350 mA => Rsense = 286 m
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 m, L= 100 H
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information
Analog Dim m ing vs LED Current Vs=12V; 3 LEDs in series TA=25C 0.4 0.35 0.3 I_LED (A) 0.25 0.2 0.15 0.1 0.05 0 0 0.5 1 1.5 Enable Voltage (V) 2 2.5 3
Figure 5 Table 7
ILD4035; Analog Voltage Dimming Percentage of Max. LED Current vs. DC Voltage at Pin 3 Percentage of max. LED current % Ven / PWM 0 10 25 50 1.9 2.2 > 2.5 Percentage of max. LED current % 75 90 100
Ven / PWM
< 0.3 0.8 1.0 1.4
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 H
ILED vs VPWM in dependency of Rsense L = 100uH 0.400 0.350 0.300 ILED (A) 0.250 0.200 0.150 0.100 0.050 0.000 0.5 1 1.5 2 VPWM (V)
ILD4035 _Analog Dimming _vs_ Rsense.vsd
Rsense=333m Rsense=600m Rsense=1200m
2.5
3
Figure 6
ILD4035; Analog Voltage Dimming with Different Rsense
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information 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
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information
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 TS
Thermal Shut Dow n Curve - Soldering Temperature 3 LEDs 35 30 25 20 15 10 5 0 40 50 60 Ts (C) 70 80 90 4 LEDs 5 LEDs 6 LEDs
Thermal shutdown vs. ambient temperature TA
Thermal Shut Dow n Curve - Ambient Temperature 3 LEDs 35 30 25 20 15 10 5 0 30 40 50 Ta (C) 60 70 80 4 LEDs 5 LEDs 6 LEDs
Vs (V)
ILD4035 _TSD_over_Ts.vsd
Vs (V)
ILD4035 _TSD_over_ Ta.vsd
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information
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.
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 303 m, L= 100 H Vs = 24 V, 6 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=303m; L=100uH) 0.450 0.425
1LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=303m; L=100uH) 4.50E+05 4.00E+05
1LED
Switching Frequency (Hz)
0.400 0.375 ILED (A) 0.350 0.325 0.300 0.275 0.250 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5.00E+04 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_303 m_ 100u.vsd
ILD4035_ Switching_Frequency_303 m_ 100u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=303m; L=100uH) 100 95
1LED
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=303m; L=100uH) 100% 90%
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
90 Efficiency (%) 85 80 75 70 65 60 5 10 15 20 25 Vs (V) 30 35 40 45
80% Duty Cycle (%) 70% 60% 50% 40% 30% 20% 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_303 m_ 100u.vsd
ILD4035 _Duty_ Cycle_303 m_ 100u.vsd
Data Sheet
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ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 303 m, L= 68 H Vs = 24 V, 6 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=303m; L=68uH) 0.450 0.425
1LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=303m; L=68uH) 4.50E+05 4.00E+05
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
Switching Frequency (Hz)
0.400 0.375 ILED (A) 0.350 0.325 0.300 0.275 0.250 5 10 15 20 25 Vs (V) 30 35 40 45
3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5.00E+04 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_303 m_68u.vsd
ILD4035 _Switching_Frequency_303 m_68u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=303m; L=68uH) 100 95 90 Efficiency (%) 85 80 75 70 65 5 10 15 20 25 Vs (V) 30 35 40 45
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=303m; L=68uH) 100% 90% 80% Duty Cycle (%) 70% 60% 50% 40% 30% 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_303 m_68u.vsd
ILD4035 _Duty_Cycle_303 m_68u.vsd
Data Sheet
20
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 303 m, L= 220 H Vs = 24 V, 6 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=303m; L=220uH) 0.450 0.425
1LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=303m; L=220uH) 4.50E+05 4.00E+05
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
Switching Frequency (Hz)
0.400 0.375 ILED (A) 0.350 0.325 0.300 0.275 0.250 5 10 15 20 25 Vs (V) 30 35 40 45
3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5.00E+04 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_303 m_ 220u.vsd
ILD4035_ Switching_Frequency_303 m_ 220u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=303m; L=220uH) 100 95
1LED
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=303m; L=220uH) 100% 90%
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
90 Efficiency (%) 85 80 75 70 65 60 5 10 15 20 25 Vs (V) 30 35 40 45
80% Duty Cycle (%) 70% 60% 50% 40% 30% 20% 10% 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_303 m_ 220u.vsd
ILD4035 _Duty_ Cycle_303 m_ 220u.vsd
Data Sheet
21
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 303 m, L= 47 H Vs = 24 V, 6 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=303m; L=47uH) 0.450 0.425 0.400 0.375 ILED (A) 0.350 0.325 0.300 0.275 0.250 5 10 15 20 25 Vs (V) 30 35 40 45 Switching Frequency (Hz)
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=303m; L=47uH) 4.50E+05 4.00E+05 3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_303 m_47u.vsd
ILD4035 _Switching_Frequency_303 m_47u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=303m; L=47uH) 100 95 90 Efficiency (%) 85 80 75 70 65 5 10 15 20 25 Vs (V) 30 35 40 45
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=303m; L=47uH) 100%
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
90% Duty Cycle (%)
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
80%
70%
60%
50% 5 10 15 20 25 Vs (V) 30 35 40 45
ILD4035 _Efficiency_303 m_47u.vsd
ILD4035 _Duty_Cycle_303 m_47u.vsd
Data Sheet
22
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 367 m, L= 100 H Vs = 24 V, 6 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=367m; L=100uH) 0.400 0.375 0.350 0.325 ILED (A) 0.300 0.275 0.250 0.225 0.200 5 10 15 20 25 Vs (V) 30 35 40 45 5.00E+05 4.50E+05
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=367m; L=100uH)
Switching Frequency (Hz)
4.00E+05 3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5.00E+04 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_367 m_ 100u.vsd
ILD4035_ Switching_Frequency_367 m_ 100u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=367m; L=100uH) 100 95 90 Efficiency (%) 85 80 75 70 65 5 10 15 20 25 Vs (V) 30 35 40 45
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=367m; L=100uH) 100% 90%
1LED 2LED 3LED
1LED
80% Duty Cycle (%) 70% 60% 50% 40% 30% 20% 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_367 m_ 100u.vsd
ILD4035 _Duty_ Cycle_367 m_ 100u.vsd
Data Sheet
23
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 367 m, L= 68 H Vs = 12 V, 3 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=367m; L=68uH) 0.400 0.375
1LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=367m; L=68uH) 5.00E+05 4.50E+05
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
Switching Frequency (Hz)
0.350 0.325 ILED (A) 0.300 0.275 0.250 0.225 0.200 5 10 15 20 25 Vs (V) 30 35 40 45
4.00E+05 3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5 10 15 20 25 Vs (V) 30 35 40 45
2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_367 m_68u.vsd
ILD4035 _Switching_Frequency_367 m_68u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=367m; L=68uH) 100 95 90 Efficiency (%) 85 80 75 70 65 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=367m; L=68uH) 100% 90% 80% Duty Cycle (%) 70% 60% 50% 40% 30% 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_367 m_68u.vsd
ILD4035 _Duty_Cycle_367 m_68u.vsd
Data Sheet
24
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 367 m, L= 220 H Vs = 12 V, 3 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=367m; L=220uH) 0.375 0.350 0.325 ILED (A) 0.300 0.275 0.250 0.225 5 10 15 20 25 Vs (V) 30 35 40 45 5.00E+05 4.50E+05
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=367m; L=220uH)
Switching Frequency (Hz)
4.00E+05 3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 1.00E+05 5.00E+04 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_367 m_ 220u.vsd
ILD4035_ Switching_Frequency_367 m_ 220u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=367m; L=220uH) 100 95 90 Efficiency (%) 85 80 75 70 65 60 5 10 15 20 25 Vs (V) 30 35 40 45
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=367m; L=220uH) 100% 90%
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
80% Duty Cycle (%) 70% 60% 50% 40% 30% 20% 10% 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_367 m_ 220u.vsd
ILD4035 _Duty_ Cycle_367 m_ 220u.vsd
Data Sheet
25
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Basic Application Information
Rsense = 367 m, L= 47 H Vs = 12 V, 3 LED with typ. VF = 3 V ILED vs. VSupply and number of LEDs
ILED (Rs=367m; L=47uH) 0.400 0.375 0.350 0.325 ILED (A) 0.300 0.275 0.250 0.225 0.200 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
FSwitch vs. VSupply and number of LEDs
Switching Frequency (Rs=367m; L=47uH) 5.00E+05 4.50E+05 Switching Frequency (Hz) 4.00E+05 3.50E+05 3.00E+05 2.50E+05 2.00E+05 1.50E+05 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _ILED_367 m_47u.vsd
ILD4035 _Switching_Frequency_367 m_47u.vsd
Efficiency vs. VSupply and number of LEDs
Efficiency (Rs=367m; L=47uH) 100 95 90 85 80 75 70 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
Duty Cycle vs. VSupply and number of LEDs
Duty Cycle (Rs=367m; L=47uH) 100% 90% 80% 70% 60% 50% 40% 5 10 15 20 25 Vs (V) 30 35 40 45
1LED 2LED 3LED 4LED 5LED 6LED 7LED 8LED 9LED 10LED 11LED
ILD4035 _Efficiency_367 m_47u.vsd
Duty Cycle (%)
Efficiency (%)
ILD4035 _Duty_Cycle_367 m_47u.vsd
Data Sheet
26
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Application Circuit
6
Application Circuit
Rsense
Vs
1 Vstab
Vref
6
I/V
2
TSD
Vref
5 Vstab
Vstab Vstab
EN / PWM
3
ILD4035
4 Pflaum
ILD4035_Application circuit.vsd
Figure 8
ILD4035; Application Circuit
Data Sheet
27
Revision 1.0, 2010-11-11
ILD4035 350 mA LED Driver
Evaluation Board
7
Evaluation Board
ILD4035 _Eval_Board .vsd
Figure 9
ILD4035; Evaluation- Board
8
Package Information SC74-6-4
0.2 2.9 (2.25)
1.1 MAX. B 0.1 MAX.
0.1 10 MAX. 0.25
0.1 2.5
1
2
3
+0.1 0.35 -0.05
0.2M B 6x
0.95 1.9
+0.1 0.15 -0.06
A
0.2M A
GPX09300
Figure 10
Package Outline
4
0.2
Pin 1 marking
3.15
2.7 8
1.15
CPWG5899
Figure 11 Data Sheet
Tape Dimensions 28 Revision 1.0, 2010-11-11
0.1 1.6
6
5
4
10 MAX.
(0.35)
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