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p-dso-8-3 led driver with adjustable current target data tle 4241 gm preliminary data sheet rev. 1.0 1 2003-03-19 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< t j <150 c very small smd-package new type 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 p-dso-8-9 (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 ordering code package tle 4241 gm q67006-a9644 p-dso-8-9 (smd)
tle 4241 gm preliminary data sheet rev. 1.0 2 2003-03-19 circuit description figure 1 block diagram an internal reference voltage of typ. 1.20v 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 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 << 1a typ. due to the high impedance of the pwm input (see fig. i pwm versus v pwm on page 12) the pwm pin can thus also be used as an enable input. aeb03003 regulation high regulation low reference voltage status control v/i converter q ref set pwm st i gnd i qtyp /ma 1.20 r ref /k --------------------- - 487 0.1 + . =
tle 4241 gm preliminary data sheet rev. 1.0 3 2003-03-19 figure 2 pin configuration (top view) pin definitions and functions pin no. symbol function 1gnd ground ; internally connected to pin 5 2st status output ; open collector output, connect to external pull up resistor (10 k or higher). 3pwm pulse width modulation input ; if not needed connect to v i 4 set high/low current input ; choice of current level 5gnd ground ; internally connected to pin 1 6ref reference input ; connect to gnd via an external resistor to adjust the output current 7q output 8i input ; block to gnd directly at the ic with a 100 nf ceramic capacitor. aep03002 8 1 gnd i st 2 7 pwm 3 6 set 4 5 q ref gnd
tle 4241 gm preliminary data sheet rev. 1.0 4 2003-03-19 application information figure 3 application circuit fig. 3 shows a typical application with the tle 4241gm led driver. the 3 leds are driven with an adequate supply current adjusted by the resistor r ref . thus brightness variations due to forward voltage spread of the leds are prevented. the luminosity spread arising from the led production process can be compensated via software by an appropriate duty cycle applied to the pwm pin. hence selection of the leds to forward voltage as well as to luminosity classes can be spared. the slightly negative temperature coefficient of the tle 4241gm output current protects the leds against overtemperature stress if the ic is placed nearby the leds. the status output of the led driver (st) detects an open load condition enabling to supervise correct led function. the functionality of the st, set and pwm as well as their timings are shown in fig. 4. aed03098 tle 4241g ref r c set pwm st tle 4271 wd r q v i q batt v la e67b osram w ro 22 f 100 nf 10 k ?
tle 4241 gm preliminary data sheet rev. 1.0 5 2003-03-19 figure 4 function and timing diagram t set,h t set,l t pwm,o n t pwm,off open load v i v pwm v set i q / ma v st t v set,h v set,l v pwm,h v pwm,l 47 10 v stl
tle 4241 gm preliminary data sheet rev. 1.0 6 2003-03-19 absolute maximum ratings ? 40 c < t j < 150 c parameter symbol limit values unit remarks min. max. input voltage v i ? 42 45 v ? current i i ?? ma internally limited output voltage v q ? 140 v ? current i q ?? ma internally limited status output voltage v st ? 0.3 40 v ? current i st ? 5 5 ma internally limited reference input voltage v ref ? 0.3 7 v ? current i ref ? 22 ma ? pulse width modulation input voltage v pwm ? 40 40 v ? current ?? 11 ma ? high/low current input voltage v set ? 40 40 v ? current i set ? 11 ma ? temperatures junction temperature t j ? 40 150 c ? storage temperature t stg ? 50 150 c ?
tle 4241 gm preliminary data sheet rev. 1.0 7 2003-03-19 note: maximum ratings are absolute ratings; exceeding any one of these values may cause irreversible damage to the integrated circuit . thermal resistances junction ambient r thja ? 105 k/w ? 1) 1) worst case regarding peak temperature; mounted on pcb 80 80 1.5 mm 3 , 35 m cu, 300 mm 2 heat sink area. operating range parameter symbol limit values unit remarks min. max. input voltage v i 445v ? status output voltage v st ? 16 v ? set voltage v set 040v ? pwm voltage v pwm 040v ? junction temperature t j ? 40 150 c ? reference resistor r ref 7100k set=h 4.7 18 k set=l absolute maximum ratings (cont ? d) ? 40 c < t j < 150 c parameter symbol limit values unit remarks min. max.
tle 4241 gm preliminary data sheet rev. 1.0 8 2003-03-19 electrical characteristics 9v v i 16 v; r ref = 10 k ; v pwm v pwm,h ; ? 40 c< t j < 150 c; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified parameter symbol limit values unit test condition min. typ. max. current consumption off mode i qoff ? 0.1 2 apwm = l, t j <85 c current consumption i ql ? 5 10 ma set = l; v q = 6 v current consumption i qh ? 6 10 ma set = h; v q = 6 v current consumption open load i ql,o ?? 10 ma set = l; v q open current consumption open load i qh,o ?? 10 ma set = h; v q open output output current i q 6.7 8.4 10 ma set = l, v q =6v ? 8.6 ? ma set = l, v q =4v output current i q 47 58.5 70 ma set = h,v q =6v ? 60.0 ? ma set = h, v q =4v current ratio i qh /i ql 678 output current limit i qmax ? 83 ? ma set = l; r ref = 0 output current limit i qmax ? 83 ? ma set = h; r ref = 0 drop voltage v dr ? 0.2 0.5 v set = l; i q = 80% of i q,nom,l drop voltage v dr ? 0.3 0.5 v set = h; i q = 80% of i q,nom,h pwm input pwm high level v pwm,h 2.0 ?? v ? pwm low level v pwm,l ?? 0.5 v ? pwm input current high level i pwm,h ? 220 500 a v pwm = 5.0 v
tle 4241 gm preliminary data sheet rev. 1.0 9 2003-03-19 pwm input current low level i pwm,l ? 10 ? 10 a v pwm = 0.0 v turn on delay time t pwm,on 0530 s 20%/80% i q , see fig. 4 turn off delay time t pwm,off 01030 s 20%/80% i q , see fig. 4 set input set high level v set,h 2.0 ?? v ? set low level v set,l ?? 0.5 v ? set input current high level i set,h ? 220 500 a v set = 5.0 v set input current low level i set,l ? 10 ? 10 a v set = 0.0 v delay time l -> h t set,h ?? 30 s 20%/80% i q , see fig. 4 delay time h -> l t set,l ?? 30 s 20%/80% i q , see fig. 4 status output lower status switching threshold v dr , ll 0.15 ?? v set = l; st = l upper status switching threshold v dr , lh ?? 0.7 v set = l; st = h lower status switching threshold v dr , hl 0.15 ?? v set = h; st = l upper status switching threshold v dr , hh ?? 0.7 v set = h; st = h status low voltage v stl ?? 0.4 v i st = 1.0 ma leakage current i stlk ?? 10 a v st = 5.0 v electrical characteristics (cont ? d) 9v v i 16 v; r ref = 10 k ; v pwm v pwm,h ; ? 40 c< t j < 150 c; all voltages with respect to ground; positive current defined flowing into pin; unless otherwise specified parameter symbol limit values unit test condition min. typ. max.
tle 4241 gm preliminary data sheet rev. 1.0 10 2003-03-19 typical performance characteristics output current versus external resistor, set=h , output current versus supply voltage, set=h , output current versus external resistor, set=l output current versus supply voltage, set=l tle4241_iq_vs_rref_h 5 0 10 20 30 40 i q / ma r ref / k 10 20 50 100 60 50 70 80 90 100 set =h v q =6v tle4241_iq_vs_vi_h 0 0 10 20 30 100 i q / ma v i / v 5 10 15 20 25 35 30 40 40 50 60 70 80 90 v q =6v r ref =10k set=h tle4241_iq_vs_rref_l 5 0 2 4 6 8 i q / ma r ref / k 10 20 50 100 12 10 14 16 18 20 set =l v q =6v tle4241_iq_vs_vi_l 0 0 2 4 6 20 i q / ma v i / v 5 10 15 20 25 35 30 40 8 10 12 14 16 18 v q =6v r ref =10k set=l
tle 4241 gm preliminary data sheet rev. 1.0 11 2003-03-19 reference voltage versus junction temperature r ref = 10 k tle4241_vref_vs_tj -40 1.15 1.17 1.19 1.21 1.23 1.25 v ref / v t j / c 04080 120 160
tle 4241 gm preliminary data sheet rev. 1.0 12 2003-03-19 pwm pin input current versus pwm voltage set pin input current versus set voltage pwm pin input current versus pwm voltage set pin input current versus set voltage tle4241_ipwm_vs_vpwm2 0 0 0.5 1.0 1.5 2.0 i pwm / ma v pwm / v 5 10 15 20 25 35 30 40 tle4241_iset_vs_vset2 0 0 0.5 1.0 1.5 2.0 i set / ma v set / v 5 10 15 20 25 35 30 40 2.5 tle4241_ipwm_vs_vpwm1 0 0 100 200 300 400 i pwm / a v pwm / v 1 2 34 5 8 7 9 tle4241_iset_vs_vset1 0 0 100 200 300 400 i set / a v set / v 1 2 34 5 8 7 9
tle 4241 gm preliminary data sheet rev. 1.0 13 2003-03-19 package outlines p-dso-8-9 (plastic dual small outline) sorts of packing package outlines for tubes, trays etc. are contained in our data book ? package information ? . dimensions in mm smd = surface mounted device
tle 4241 gm preliminary data sheet rev. 1.0 14 2003-03-19 edition 2003-03-19 published by infineon technologies ag, st.-martin-strasse 53, d-81541 mnchen, germany ? infineon technologies ag 3/19/03. all rights reserved. attention please! the information herein is given to describe certain components and shall not be consid- ered as warranted characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descrip- tions and charts stated herein. infineon technologies is an approved cecc manufacturer. information for further information on technology, deliv- ery terms and conditions and prices please contact your nearest infineon technologies office in germany or our infineon technolo- gies representatives worldwide (see ad- dress list). warnings due to technical requirements components may contain dangerous substances. for in- formation on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or systems with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the fail- ure of that life-support device or system, or to affect the safety or effectiveness of that de- vice or system. life support devices or sys- tems are intended to be implanted in the hu- man 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.

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