TLE4241GM_07

LED Driver with Adjustable Current TLE 4241 GM Features • • • • • • • • • • • Adjustable constant output current Wide input voltage range Low drop voltage Open load detection Overtemperature protection Short circuit proof Reverse polarity proof Wide temperature range: -40 °C < Tj < 150 °C Very small SMD-Package Green Product (RoHS compliant) AEC Qualified P-DSO-8-3, -6, -7, -8, -9 Functional Description The TLE 4241 GM is an integrated adjustable constant current source. It provides an output current adjustable via different means (SET, PWM, reference resistor) which is kept nearly independent from load and supply voltage changes. The IC is designed to supply LEDs under the severe conditions of automotive applications resulting in constant brightness and extended LED lifetime. It is provided in the very small PG-DSO-8-16 (Micro 8) package. Protection circuits prevent damage to the device in case of overload, short circuit, reverse polarity and overtemperature. The connected LEDs are protected against reverse polarity as well as excess voltages up to 45 V. A status output allows handling of open load and short circuit at the main output. A PWM input offers the possibility to adjust the LED brightness by pulse width modulation. With an implemented high/low current switch the output current level can be reduced e.g. for brake/tail light application. The implemented features such as adjustable output current, the high/low current switch and the provided PWM input make the device well suited for a broad range of LED and other applications. Type TLE 4241 GM Data Sheet 1 Package PG-DSO-8-16 Rev. 1.3, 2007-03-19 TLE 4241 GM Circuit Description I Q ST Status Regulation High Regulation Low Control PWM SET Reference Voltage V/I Converter REF GND AEB03003 Figure 1 Block Diagram An internal reference voltage of typ. 1.20 V supplies the REF pin which is connected to GND via an external resistor. In the SET = H mode the reference current flowing on the REF pin is mirrored with an amplification to form the desired output current. The typ. output current in the SET = H mode calculates: 1.20 I Q, typ /mA = ---------------------- × 487 + 0.1 R REF /k Ω (1) The output current is shown as a function of the reference resistance on Page 10 for the high as well as for the low current mode. With the PWM input the LED brightness can be regulated via duty cycle. Also PWM = L sets the TLE 4241 in sleep mode resulting in a very low current consumption of H Delay time H -> L Status Output Lower status switching threshold Symbol Limit Values Min. Typ. 10 Max. 30 µs 20%/80% IQ, see Figure 4 – – Unit Test Condition tPWM,OFF 0 VSET,H VSET,L ISET,H ISET,L tSET,H tSET,L 2.0 – – -10 – – – – 220 – – – – 0.5 500 10 30 30 V V µA µA µs µs VSET = 5.0 V VSET = 0.0 V 20%/80% IQ, see Figure 4 20%/80% IQ, see Figure 4 (VI - VQ) decreasing SET = L (VI - VQ) decreasing SET = H (VI - VQ) increasing SET = L (VI - VQ) increasing SET = H (VI - VQ) < Vdr,L IST = 1.0 mA (VI - VQ) > Vdr,H VST = 5.0 V Vdr,L 0.15 0.15 – – – – – – – – 0.7 0.7 0.4 10 V V V V V µA Upper status switching threshold Vdr,H – – Status low voltage Leakage current VSTL ISTLK – – Data Sheet 9 Rev. 1.3, 2007-03-19 TLE 4241 GM Typical Performance Characteristics Output Current versus External Resistor, SET = H 100 AED03333.VSD Output Current versus External Resistor, SET = L 20 AED03334.VSD IQ mA 80 70 60 50 40 30 20 10 0 5 10 20 SET = H VQ = 6 V IQ mA 16 14 12 10 8 6 4 2 VQ = 6 V SET = L 50 kΩ 100 0 5 10 20 50 kΩ 100 RREF RREF Output Current versus Supply Voltage, SET = H 100 AED03335.VSD Output Current versus Supply Voltage, SET = L 20 AED03336.VSD IQ mA 80 70 60 50 40 30 20 10 0 0 5 VQ = 6 V RREF = 10 kΩ SET = H IQ mA 16 14 12 10 8 6 4 2 VQ = 6 V RREF = 10 kΩ SET = L 10 15 20 25 30 V 40 0 0 5 10 15 20 25 30 V 40 VI VI Data Sheet 10 Rev. 1.3, 2007-03-19 TLE 4241 GM Reference Voltage versus Junction Temperature 1.25 AED03340.VSD VREF V RREF = 10 kΩ 1.23 1.21 1.19 1.17 1.15 -40 0 40 80 °C 160 Tj Data Sheet 11 Rev. 1.3, 2007-03-19 TLE 4241 GM PWM Pin Input Current versus PWM Voltage 2.0 mA AED03332.VSD PWM Pin Input Current versus PWM Voltage 400 µA AED03331.VSD IPWM IPWM 1.5 300 1.0 200 0.5 100 0 0 5 10 15 20 25 30 V 40 0 0 1 2 3 4 5 6 V8 VPWM VPWM SET Pin Input Current versus SET Voltage 2.5 AED03338.VSD SET Pin Input Current versus SET Voltage 400 µA AED03337.VSD ISET mA 2.0 ISET 300 1.5 200 1.0 100 0.5 0 0 5 10 15 20 25 30 V 40 0 0 1 2 3 4 5 6 V8 VSET VSET Data Sheet 12 Rev. 1.3, 2007-03-19 TLE 4241 GM Package Outlines 0.35 x 45° 1.75 MAX. 0.175 ±0.07 (1.45) 4 -0.21) 0.19 +0.0 6 1.27 0.41 +0.1 -0.06 8 5 0.1 B 6 ±0.2 0.64 ±0.25 0.2 M A B 8x Index Marking 1 4 5 -0.21) A 1) Does not include plastic or metal protrusion of 0.15 max. per side 2) Lead width can be 0.61 max. in dambar area GPS01229 Figure 5 PG-DSO-8-16 (Plastic Dual Small Outline) Green Product (RoHS compliant) To meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020). You can find all of our packages, sorts of packing and others in our Infineon Internet Page “Products”: http://www.infineon.com/products. SMD = Surface Mounted Device Data Sheet 13 Dimensions in mm Rev. 1.3, 2007-03-19 8° MAX. TLE 4241 GM Revision History Version Rev. 1.2 Rev. 1.3 Date Changes 2004-04-13 Page 4, 9: Improved indication and explanation of the open load detection function. 2007-03-19 Initial version of RoHS-compliant derivate of TLE 4241 GM Page 1: AEC certified statement added Page 1 and Page 13: RoHS compliance statement and Green product feature added Page 1 and Page 13: Package changed to RoHS compliant version Legal Disclaimer updated Data Sheet 14 Rev. 1.3, 2007-03-19 Edition 2007-03-19 Published by Infineon Technologies AG 81726 Munich, Germany © 2007 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. 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