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Data Sheet

Revision 2.0, 2011-08-17

ILD4035

350 mA Step Down LED Driver

LED Drivers for High Power LEDs

Summary of content (30 pages)

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LED Drivers for High Power LEDs ILD4035 350 mA Step Down LED Driver Data Sheet Revision 2.
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Edition 2011-08-17 Published by Infineon Technologies AG 81726 Munich, Germany © 2011 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.
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ILD4035 350 mA Step Down LED Driver Revision History Page or Item Subjects (major changes since previous revision) Revision 2.
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ILD4035 350 mA Step Down LED Driver Table of Contents Table of Contents Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ILD4035 350 mA Step Down 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 Data Sheet Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Total Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Safe Operating Area . . . . . . . . . . . . . . . . . . . . .
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ILD4035 350 mA Step Down LED Driver List of Tables List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Data Sheet Pin Definition and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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ILD4035 350 mA Step Down LED Driver List of Tables Data Sheet 7 Revision 2.
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350 mA Step Down LED Driver with Internal Switch ILD4035 1 • • • • • • • • • • • • • Features Wide input voltage range: 4.5 V ...
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ILD4035 350 mA Step Down LED Driver Product Brief 2 Product Brief The ILD4035 is a hysteretic step down LED driver IC for general lighting applications, which is capable to drive high power LEDs with average currents up to 400 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.
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ILD4035 350 mA Step Down LED Driver Product Brief Pin Definition Table 1 Pin Definition and Function Pin No. Name Pin Type Buffer Type Function 1 Vs Input – Supply voltage 2 GND GND – IC ground 3 EN / PWM Input – Multifunctional pin: • Chip enable signal • Analog dimming signal • PWM dimming signal 4 Vswitch Output – Power switch output 5 GND GND – IC ground 6 Vsense Input – LED current sense input Data Sheet 10 Revision 2.
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ILD4035 350 mA Step Down LED Driver Maximum Ratings 3 Maximum Ratings Table 2 Maximum Ratings Parameter Symbol Values Min. Typ. Max. Unit Note / Test Condition Supply voltage VS – – 45 V – Peak output current ISwitch – – 550 mA Hysteretic peak current Total power dissipation, Ts ≤ 85°C Ptot – – 1000 mW – Junction temperature TJ – – 150 °C – Storage temperature range TSTG -65 – 150 °C – ESD capability at all pins VESD HBM kV – – 4 HBM acc.
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ILD4035 350 mA Step Down LED Driver Thermal Characteristics 4 Thermal Characteristics Table 3 Maximum Thermal Resistance Parameter Symbol 1) Junction - soldering point Values RthJS Min. Typ. Max. – – 65 Unit Note / Test Condition K/W – 1) For calculation of RthJA please refer to application note AN077 (Thermal Resistance Calculation) 1.2 1 Ptot [W] 0.8 0.6 0.4 0.
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ILD4035 350 mA Step Down LED Driver Thermal Characteristics 45 40 VS - VΣfLED [V] 35 30 47 μH 68 μH 100 μH 150 μH 220 μH 330 μH 25 20 15 10 5 0 0.05 Figure 3 0.1 0.15 0.2 0.25 0.3 0.35 Average LED current ILED [A] 0.4 0.45 Safe Operating Area Figure 3 shows the safe operating area for the respective inductance values. The safe operating area consists of the minimum and maximum allowed average LED current and the resulting voltage overhead.
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ILD4035 350 mA Step Down LED Driver Electrical Characteristics 5 Electrical Characteristics 5.1 DC Characteristics All parameters at TA = 25 °C, unless otherwise specified. VS = 12 V, 3 LEDs, Rsense = 303 mΩ (ILED = 375 mA), L = 100 μH, VEN = 3 V, VfLED = 3 V Table 4 DC Characteristics Parameter Symbol Values Unit Min. Typ. Max. Note / Test Condition Supply voltage VS 4.5 – 40 V Overall current consumption open load IS open load 1.4 2.3 3.1 mA VS = 4.
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ILD4035 350 mA Step Down LED Driver Electrical Characteristics 5.2 Switching Characteristics All parameters at TA = 25 °C, unless otherwise specified. VS = 12 V, 3 LEDs, Rsense = 303 mΩ (ILED = 375 mA), L = 100 μH, VEN = 3 V, VfLED = 3 V Table 5 Switching Characteristics Parameter Symbol Values Unit Min. Typ. Max. Switching frequency fSwitch – 120 – kHz Maximum switching frequency fSwitch max – – 500 kHz – 114 – mV Vsensehys – ±7.
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ILD4035 350 mA Step Down LED Driver Basic Application Information 6 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 6.1 Setting the average LED current The average output current for the LEDs is set by the external sense resistor Rsense.
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ILD4035 350 mA Step Down LED Driver Basic Application Information ILED versus VEN, TA=25 °C 0.4 ILED (relative) versus VEN, TA=25 °C 110 303 mΩ, 100 μH 333 mΩ, 100 μH 600 mΩ, 100 μH 1200 mΩ, 220 μH 0.3 303 mΩ, 100 μH 333 mΩ, 100 μH 600 mΩ, 100 μH 1200 mΩ, 220 μH 100 90 80 ILED [%] ILED [A] 70 0.2 60 50 40 30 0.1 20 10 0 1 1.5 2 VEN [V] 2.5 3 2.5 3 0 1 1.5 2 VEN [V] 2.5 3 ILED versus VEN, 333 mΩ, 100 µH 0.4 -40 °C 25 °C 85 °C 105 °C 0.35 ILED [A] 0.3 0.25 0.2 0.15 0.1 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Contrast Ratio 1000 100 10 1 100 1000 10000 PWM Dimming Frequency [Hz] Figure 4 Data Sheet PWM Dimming 18 Revision 2.
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ILD4035 350 mA Step Down LED Driver Basic Application Information 6.3 Temperature Protection Circuit ILD4035 incorporates a temperature protection circuit referring to the junction temperature of ILD4035. The higher the junction temperature of ILD4035 the lower the current of the LEDs. This feature helps to reduce the power dissipation of ILD4035 and the LEDs. Yet still the product specific maximum ratings for junction temperature need to be observed to avoid a permanent damage of the devices.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 303 mΩ, L= 47 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.45 500 400 fSwitch [kHz] ILED [A] 0.4 0.35 0.3 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 303 mΩ, L= 68 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.45 500 400 fSwitch [kHz] ILED [A] 0.4 0.35 0.3 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 303 mΩ, L= 100 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.45 500 400 fSwitch [kHz] ILED [A] 0.4 0.35 0.3 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 303 mΩ, L= 220 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.45 500 400 fSwitch [kHz] ILED [A] 0.4 0.35 0.3 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 367 mΩ, L= 47 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.4 500 400 fSwitch [kHz] ILED [A] 0.35 0.3 0.25 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 367 mΩ, L= 68 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.4 500 400 fSwitch [kHz] ILED [A] 0.35 0.3 0.25 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 367 mΩ, L= 100 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.4 500 400 fSwitch [kHz] ILED [A] 0.35 0.3 0.25 0.
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ILD4035 350 mA Step Down LED Driver Basic Application Information Rsense = 367 mΩ, L= 220 µH ILED versus VS and Number of LEDs fSwitch versus VS and Number of LEDs 0.4 500 400 fSwitch [kHz] ILED [A] 0.35 0.3 0.25 0.
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ILD4035 350 mA Step Down LED Driver Application Circuit 7 Application Circuit Rsense Vs 1 2 Vstab Vref 6 I/V TPC Vref Vstab 5 Vstab Vstab EN / PWM 3 Figure 5 Application Circuit 8 Evaluation Board Figure 6 ILD4035 on Evaluation Board Data Sheet 4 ILD4035 28 Revision 2.
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ILD4035 350 mA Step Down LED Driver Package Information Package Information 2.9 ±0.2 (2.25) B 1.1 MAX. 0.15 +0.1 -0.06 5 4 1 2 3 0.35 +0.1 -0.05 Pin 1 marking 0.2 1.6 ±0.1 6 2.5 ±0.1 (0.35) 0.25 ±0.1 9 A B 6x M 0.1 MAX. 0.95 0.2 1.9 M A SC74-PO V04 Figure 7 Package Outline SC74 2.9 1.9 0.5 0.95 SC74-FPR V04 Figure 8 Recommended PCB Footprint for Reflow Soldering 0.2 2.7 8 4 Pin 1 marking Figure 9 Data Sheet 3.15 1.15 SC74-TP Tape Loading 29 Revision 2.
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