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infineon? litix? power 700ma high integration - dc/dc step-down converter tld5045ej infineon? litix? power 700ma high integration - dc/dc step-down converter automotive power data sheet revision 1.0 2015-05-28
infineon? litix? power tld5045ej table of contents data sheet 2 revision 1.0 2015-05-28 not for customers table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 general product characteristic s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 functional range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.3 thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.1 general parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.2 power supply monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 enable, dimming function and thermal pr otection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.2 electrical characteristics enable, bias, dimming functi on and thermal protection . . . . . . . . . . . . . 14 6.2.1 pwm dimming with c connected to tl d5045ej pwmi pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.2.2 internal pwm dimming function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.3 overtemperature protection of the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 open load diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.2 electrical characteristics: open load diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.3 open load diagnosis in different application conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.3.1 light module application without c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.4 application with c connected to tld5045ej ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.1 output peak current adjustment via r set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.2 switching frequency determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8.3 tld5045ej in different led applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 8.3.1 tld5045ej in a body control module (bcm) with c interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 8.3.2 decentralized light module application - dlm (input configuration 1) . . . . . . . . . . . . . . . . . . . . . . . 25 8.3.3 decentralized light module application - dlm (input configuration 2) . . . . . . . . . . . . . . . . . . . . . . . 26 8.3.4 decentralized light module application - dlm (input configuration 3) . . . . . . . . . . . . . . . . . . . . . . . 27 9 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table of contents
pg-dso-8 ep type package marking device1 pg-dso-8 ep pg-dso-8 ep data sheet 3 revision 1.0, 2015-05-28 tld5045ej infineon? litix? power 1 overview ? constant current generation ? wide input voltage range from 5v to 40v ? peak current regulation ? very low current consumption (<2ua) in sleep mode ? integrated power transistor with low saturation voltage ? integrated fast freewheeling diode ? integrated load current sense resistor ? integrated status pull down transistor ? overtemperature protection ? switching frequency (typ. 200khz) adjustable via external rc network ? external pwm dimming input ? integrated pwm dimming engine ? analog dimming (output current adjustable via externa l low power resistor and possibility to connect ptc resistor for led protection during overtemperature conditions) ? stable switching frequency due to fix off-time concept with vrec (supply voltage) feedforward ? under- and overvoltage shutdown with hysteresis ? small thermally enhanced ex posed heatslug smd package ? automotive aec qualified ? green product (rohs) compliant description the tld5045ej is a highly integrated smart led buck controller with built in protection functions. the main function of this device is to drive single or multiple series connected leds efficiently from a voltage source higher than the led forward voltage by regulating a constant led curr ent. the constant current regulation is especially beneficial for led color accuracy and lo ng led lifetime. the built in freewheeling diode and switching transistor with current se nse requires less external components and saves system costs. high flexibility is achieved by placing low power resistors to adjust output currents up to 700ma and the regulator switching frequency (typ. 200khz). an integrated pwm dimming engine pr ovides a led dimming function by placing a simple rc network to gnd. this feature is dedicated for decentralized light modules without micro controller involvement. in addition to that an integrated status pull down transistor can be used to simulate a minimum current flow for decentralized modules to av oid a wrong open load detection by a highside switch located in the body control module (bcm). application ? automotive led driven exterior li ghting: brake, tail, chmsl, daytim e running light, position light ? automotive led driven interior lighting: read ing light, dome light, display backlighting
data sheet 4 revision 1.0 2015-05-28 infineon? litix? power tld5045ej block diagram 2 block diagram the tld5045 regulates the led current by monitoring the load current (peak current measurement) through the internal switch cycle by cycle. when the curr ent through the switch reaches the threshold i peak the switch is shut- off and it is kept off for a time equal to t off . both i peak and t off can be fixed through few external components. the peak current i peak is fixed by a resistor connected to the set pin while the t off is fixed by rc network. as t off is fixed and the duty cycle depends on v rec , the frequency depends on v rec as well. refer to chapter 8.2 for the evaluation of the switching frequency. figure 2-1 block diagram tld5045ej 1 5 3 2 8 7 6 gnd vrec logic power switch freq sw internal supply en thermal protection uv+ov lockout set pwmi st power- switch driver open load detection peak current measurement on/off logic peak current adjustment 4 off-time control internal pwm generation
data sheet 5 revision 1.0 2015-05-28 infineon? litix? power tld5045ej pin configuration 3 pin configuration 3.1 pin assignment figure 3-1 pin configuration tld5045ej 3.2 pin definitions and functions table 3-1 sec_bias_prereg pin definition and function # name direction type function 1vrec voltage recirculation output and internal supply input; this pin is the supply pin of the ic (see block diagram). furthermore the cathode of the integrated fast free- wheeling diode is connecte d to this pin as well. 2st status output; open collector diagnostic ou tput to indicate an open load failure. refer to chapter 7 for more details. 3en enable; apply logic high signal to enable the device 4set set input; connect a low power resistor to adjust the output current. st gnd en freq sw 5 6 4 3 2 7 1 8 set tld5045 vrec pwmi ep
data sheet 6 revision 1.0 2015-05-28 infineon? litix? power tld5045ej pin configuration 5pwmi pwm input; pwm signal for dimming leds. connect external r and c combination to achieve an auto pwm-dimming function with defined frequency and duty cycle. 1) internal pwm dimming function (external rc connected to gnd) 2) external pwm dimming functi on (c is controlling this pin) refer to chapter 6 for more details. 6freq frequency select input; connect external resistor and capacitor to gnd to set the off-time of the switching frequency. 7gnd ground; connect to system ground. sw integrated power-switch output; collector of the integrat ed npn-power transistor. ep exposed pad; connect to external heatsp reading copper area with electrically gnd (e.g. inner gnd layer of the pcb via thermal vias) table 3-1 sec_bias_prereg pin definition and function (continued) # name direction type function
data sheet 7 revision 1.0 2015-05-28 infineon? litix? power tld5045ej general product characteristics 4 general product characteristics 4.1 absolute maximum ratings tj = -40c to +150c ; all voltages with respect to ground (unless otherwise specified) table 4-1 absolute maximum ratings 1) parameter symbol values unit note or test condition number min. typ. max. voltages vrec (pin 1) recirculation and supply input v rec -0.3 45 v p_4.1.1 vrec (pin 1) maximum current flowing continuously through the freewheeling diode and the power switch v fw,sw 1.2 a ? maximum ambient temperature must be calculated with given rthja of the application p_4.1.2 st (pin 2) diagnostic status output voltage v st -0.3 45 v p_4.1.3 st (pin 2) diagnostic status current i st 150 ma ?no short circuit protection and no current limitation implemented p_4.1.4 en (pin 3) enable input voltage v en -0.3 45 v p_4.1.5 set (pin 4) peak current adjust input voltage v set -0.3 6 v p_4.1.6 pwmi (pin 5) pwm input voltage v pwmi -0.3 6 v p_4.1.7 freq (pin 6) off-time adjustment input v freq -0.3 6 v p_4.1.8 sw (pin 8) switch output v sw -0.3 45 v p_4.1.9 temperatures junction temperature t j -40 150 c p_4.1.10 storage temperature t sw -55 150 c p_4.1.11
data sheet 8 revision 1.0 2015-05-28 infineon? litix? power tld5045ej general product characteristics note: 1. stresses above the ones listed he re may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. integrated protection functions are designed to preven t ic destruction under fault conditions described in the data sheet. fault conditions are cons idered as ?outside? normal operatin g range. protection functions are not designed for continuous repetitive operation. 4.2 functional range note: within the functional range the ic operates as descr ibed in the circuit description. the electrical characteristics are specifi ed within the conditions given in the re lated electrical ch aracteristics table. esd susceptibility esd resistivity all pins to gnd v esd, hbm -2 2 kv hbm 2) esd results available? p_4.1.12 esd resistivity to gnd v esd -500 500 v cdm 3) p_4.1.13 esd resistivity corner pins to gnd v esd -750 750 v cdm p_4.1.14 1) not subject to production test, specified by design. 2) esd susceptibility hbm according to eia/jesd 22-a 114b 3) esd susceptibility, charged device mode l ?cdm? eia/jesd22-c101 or esda stm5.3.1 table 4-2 functional range parameter symbol values unit note or test condition number min. typ. max. voltages extended supply voltage v rec 540 1) 1) not subject to production test, specified by design v parameter deviations possible p_4.2.1 nominal supply voltage range v fw,swrec 836v p_4.2.2 external inductor l sw 220 560 h max.560h to avoid ol p_4.2.3 output current range i out 100 700 ma p_4.2.4 switching frequency f sw 50 300 khz t j = 25c to 150c p_4.2.5 junction temperature t j -40 150 c p_4.2.6 table 4-1 absolute maximum ratings 1) parameter symbol values unit note or test condition number min. typ. max.
data sheet 9 revision 1.0 2015-05-28 infineon? litix? power tld5045ej general product characteristics 4.3 thermal resistance note: this thermal data was generated in accordance with jedec jesd51 standards. for more information, go to www.jedec.org . table 4-3 thermal resistance parameter symbol values unit note or test condition number min. typ. max. voltages junction to case r thj-case 10 k/w 1)2) 1) not subject to production test, specified by design. 2) specified r thj-case value is simulated at natural convection on a cold plate setup (all pins and the exposed pad are fixed to ambient temperature). ta=25c, power switch and freewheeling diode are dissipating 1w. p_4.3.1 junction to ambient (2s2p) r thja 40 k/w 1)3) 3) specified rthja value is according to jedec jesd51-2,-7 at natural convection on fr4 2s2p board; the product (chip+package) was simulated on a 76.2 x 114.3 x 1.5 mm board with 2 inner copper layers (2 x 70m cu, 2 x 35m cu). according to jesd51-5 a thermal via array under the exposed p ad contacted the first inner copper layer. ta=25c, power switch and freewheeling diode are dissipating 1w. p_4.3.2
data sheet 10 revision 1.0 2015-05-28 infineon? litix? power tld5045ej electrical characteristics 5 electrical characteristics tj = -40c to +150c, all voltages with resp ect to ground (unles s otherwise specified) 5.1 general parameters table 5-1 electrical characteristics parameter symbol values unit note or test condition number min. typ. max. voltage drop over power transistor v drop,100 ? 0.8 ? v ipeak=100ma p_5.1.1 voltage drop over power transistor v drop,700 ? 1.4 ? v ipeak=700ma p_5.1.2 freewheeling diode forward voltage v fw,100 ? 0.8 ? v ipeak=100ma p_5.1.3 freewheeling diode forward voltage v fw,70 0 ? 1.4 ? v ipeak=700ma p_5.1.4 peak over current limit i peak_lim ?1.4?a p_5.1.5 peak current accuracy i peak_acc 450 500 550 ma vrec = 12v ven = 5v vled = 7.2v rset = 14k lsw = 220h fsw = 200khz p_5.1.6 input under voltage shutdown threshold v rec,uvoff ? ? 5 v ven = 5v vrec decreasing; see figure 5-1 p_5.1.7 input voltage startup threshold v rec,uvon ? ? 6 v ven = 5v vrec increasing; see figure 5-1 p_5.1.8 input under voltage shutdown hysteresis v rec,uvhyst ?1?v p_5.1.9 input over voltage shutdown threshold v rec,ovoff 40.5 ? ? v ven = 5v vrec increasing; see figure 5-1 p_5.1.10 input over voltage startup threshold v rec,ov 40 ? ? v ven = 5v vrec decreasing; see figure 5-1 p_5.1.11 input over voltage shutdown hysteresis v rec,ovhyst ?0.5?v p_5.1.12 switch on delay t don ? 400 600 ns 1) ? p_5.1.13 switch off delay t doff ? 500 850 ns 1) ? p_5.1.14
data sheet 11 revision 1.0 2015-05-28 infineon? litix? power tld5045ej electrical characteristics 5.2 power supply monitoring over- and undervoltage shutdown if the supply voltage v rec drops below the input under voltagae threshold voltage v rec,uvoff , the power stage is switched off and the device is in normal consumption mode (i q,on ). if v rec rises again and reaches the input undervoltage startup threshold v rec,uvon the power stage is restarted and the device is back to normal operation mode. same behaviour applies to overvoltage. the internal status transistor switches off duri ng an overvoltage or un dervoltage event on v rec . a detailed description of the under and overvoltage behaviour is displayed in figure 5-1 below. reference voltage at set pin v set 1.16 1.225 1.29 v p_5.1.15 pull up current for freq pin i freq 5 ? ? ma vfreq=0v p_5.1.16 oscillator switch off threshold v freq,high ?3.2?v p_5.1.17 oscillator switch on threshold v freq,low ?1.2?v p_5.1.18 1) the minimum switching on time ton must be greater than tdon + tdoff table 5-1 electrical characteristics parameter symbol values unit note or test condition number min. typ. max.
data sheet 12 revision 1.0 2015-05-28 infineon? litix? power tld5045ej electrical characteristics figure 5-1 over- and undervoltage protection v sw v r ec,uvoff v rec,uvon v rec,uvhyst t t i led t v rec v rec,ovhyst v rec,ovon v rec,ovoff i set st t st pull- down on st pull-down transistor off st pull-down transistor off st pull- down on st pull- down on
data sheet 13 revision 1.0 2015-05-28 infineon? litix? power tld5045ej enable, dimming function and thermal protection 6 enable, dimming function and thermal protection 6.1 description enable function a logic high signal on the en pin turns the device on. a lo gic low signal on enable pin en brings the device in sleep mode. the current consumption is typ. 0.1 a in this ca se. the en pin has an internal pull down resistor which ensures that the ic is in sleep mode and the power stage is switched off in case the pin en is externally not connected. dimming function the pwmi pin combines two functions: 1. pwm dimmming via a c (3.3v and 5v c) 2. integrated pwm dimming engine for standalone solu tions in decentralized light module (frequency and duty cycle adjustable via external r,c network) a detailed description of the pwmi pin is displayed in below. figure 6-1 pwmi pin description pwmi on ? dc=100% v pwmi pwmi off ? dc=0% t sw- on sw - off sw- on sw - off sw- on sw - off sw- on sw - off internal pwm v pwmi,off v pwmi,on
data sheet 14 revision 1.0 2015-05-28 infineon? litix? power tld5045ej enable, dimming function and thermal protection 6.2 electrical characteristics enable, bias, dimming function and thermal protection v rec = 4.5 v to 18 v , tj = -40c to +150c , all voltages with respect to gr ound (unless otherwise specified) table 6-1 electrical characteristics: enable , bias, dimming function and thermal protection parameter symbol values unit note or test condition number min. typ. max. current consumption, sleep mode i q,off ?0.12a v en = 0v; v rec = 16v p_6.2.1 current consumption, active mode (open load) i q,on ??5ma v en = 5.0v; i peak = 0ma (open load); v rec = 16v p_6.2.2 current consumption, active mode i q,on ??10ma v en = 5.0v; i peak = 700ma v rec = 16v p_6.2.3 en turn on threshold v en,on 2.8 ? ? v ? p_6.2.4 en turn off threshold v en,off ??0.8v p_6.2.5 en high input current i en,hi ? 100 ? a v en = 5v p_6.2.6 en low input current i en,lo 0?20a v en = 0.5v p_6.2.7 pwmi turn on threshold v pwmi,on ?1?vsee figure 6-1 p_6.2.8 pwmi turn off threshold v pwmi,off ?2?v see figure 6-1 p_6.2.9 pwmi source current i pwmi ? 250 ? a r set = 10k v pwmi = 0.5v; p_6.2.10 over temperature shutdown t j,sd 150 175 ? c 1) 1) specified by design. not subject to production test. p_6.2.11 over temperature shutdown hysteresis t j,sd_hyst ?15?k 1) p_6.2.12
data sheet 15 revision 1.0 2015-05-28 infineon? litix? power tld5045ej enable, dimming function and thermal protection 6.2.1 pwm dimming with c connected to tld5045ej pwmi pin the pwmi pin can be used for pwm dimming. it is a commonly practiced dimming method to prevent color shift in led light applications. figure 6-2 timing diagram for led dimming with c v pwmi v pwmi,off i peak v pwmi,on t t t pwmi t off sw - on sw - off sw - off sw - on sw - off
data sheet 16 revision 1.0 2015-05-28 infineon? litix? power tld5045ej enable, dimming function and thermal protection 6.2.2 internal pwm di mming function the tld5045ej has an integrated pwm dimmi ng engine. via an external r pwm and c pwm network it is possible to achieve a pwm led current waveform. the duty cycle and dimming frequency is depending on the size of the external components (see formula in figure 6-4 ). this feature is specially designed to achieve a stand alone pwm dimming function without the usage of micro controllers or external logic. this allows a flexible and cost effective usage of the device in a decentralized light module application (refer to application drawing ). the advantage of a pwm dimming (to redu ce the led load current) is the change of light intensity only, at constant light color. with an external rc network a pwm programming betw een 100hz and 1200hz and duty cycles between 4% and max. 20%. is possible. figure 6-3 displays the external components corresponding to the desired pwm frequency and duty cycle. the following setup applies fo r the table displayed in figure 6-3 : v rec =12v, v led =7.2v, l sw =220h, r set =14k . figure 6-3 r pwmi and c pwmi versus f pwmi and dc r pwmi c pwmi f pwmi dc 216k 64nf 100hz 4% 216k 32nf 200hz 4% 216k 21nf 300hz 4% 216k 16nf 400hz 4% 87k 150nf 100hz 10% 87k 75nf 200hz 10% 87k 50nf 300hz 10% 87k 37nf 400hz 10% 44k 265nf 100hz 20% 44k 132nf 200hz 20% 44k 88nf 300hz 20% 44k 66nf 400hz 20%
data sheet 17 revision 1.0 2015-05-28 infineon? litix? power tld5045ej enable, dimming function and thermal protection 6.3 overtemperature prot ection of the device a temperature sensor at the power stage causes the ov erheated device to switch off to prevent destruction. during over temperature condition the internal st transist or is switched off. due to the autorestart function of the device the status signal will toggle ac cordingly. the timing of this pattern is dependant on the thermal capability of the application and can be used to distinguish between open load error and overtemperature condition. more details on the overtemperature behavior is displayed in figure 6-4 below. figure 6-4 r pwmi and c pwmi versus f pwmi and dc v sw t i led t ? v en t h l t j t ta t jsd t jso i peak st t st pull-down transistor on st pull- down off st off st on st off st on st off st on st off
data sheet 18 revision 1.0 2015-05-28 infineon? litix? power tld5045ej open load diagnosis 7 open load diagnosis 7.1 description the tld5045ej has an integrated open load during on diagnosis. during normal operation the st pin (open collector output) is pulled to gnd (internal transistor is on ). the open load detection is realized by monitoring the switching behavior at the sw pin. du ring an open load event the integrated power stage at the sw pin will be statically turned on. if the output stage is turned on for more than the open load diagnosis delay time (t ol ) an open load condition is detect ed. an open load event will s witch off the internal transi stor. if a c is connected to the st pin an external pull up resistor should be plac ed to achieve a logic high level for the proper open load error signalling repo rting. for a timing diagram on the functionality of the open load diagnosis please refer to figure 7-1 and figure 7-2 . 7.2 electrical characteristics: open load diagnosis v rec = 4.5 v to 18 v , tj = -40c to +150c , all voltages with respect to gr ound (unless otherwise specified) table 7-1 functional range parameter symbol values unit note or test condition number min. typ. max. voltages open load diagnosis delaytime t ol 20 ? ? s p_7.2.1 open load diagnosis current i ol ?50?ma p_7.2.2 voltage drop over internal st transistor v drop,st ?0.3?v i st =150ma p_7.2.3
data sheet 19 revision 1.0 2015-05-28 infineon? litix? power tld5045ej open load diagnosis 7.3 open load diagnosis in diff erent application conditions 7.3.1 light module appl ication without c most of the time, the open load diagnosis of the whole lig ht module is done via the current sense of the driver ic (e.g. profet) located in the light c ontrol module (or bcm module). see figure 8-6 for a simplifie d application schematic. the light module needs to sink a specified mi nimum current (e.g. 100ma) to indicate normal operation. to guarantee this minimum current also under light load conditions (e.g. high efficiency led bin at high supply voltages = min. load current required) system designers often have to place resistors in parallel to the application circuit (see resistors conn ected to supply lines in figure 8-6 ). when using such resistors connected between v s and gnd, an open led diagnosis is not possible anymore. to overcome this issue an internal transistor (open collector) is connected to the st pin of the tld5045ej . during normal operation the st pin is low and a minimum module current can be guaranteed. as soon as an open load occurs the internal st trans istor switches off. due to this, the current on the v rec pin decreases below the open load detection threshold of the driver ic located in the light control module. note: open load is only detected during the on cycle of t he switching transistor. during the off state the st signal displays what was detected in the previous on state. figure 7-1 open load diagnosis using internal pwm mode t ol v pwmi open load event st t t t t open load v sw st pull -down transistor off st pull -down transistor on v pwmi,off v pwmi,on high - z
data sheet 20 revision 1.0 2015-05-28 infineon? litix? power tld5045ej open load diagnosis 7.4 application with c connected to tld5045ej ic the st pin can be connected directly to a c input. duri ng an open load condition t he st transistor is off. an external pull up resistor connected to v dd is required to signal a logic high signal on the st pin during an open load error. please consider that this diagnosis functionalit y is only active if the device is in active mode (high potential at the en pin). refer to application drawing figure 8-5 . figure 7-2 open load diagnosis via c connected to st pin open load event v sw st t ol open load t t t t t pwmi v en t high low sw - on sw - off sw - off sw - on sw - off v pwmi,off v pwmi,on st pull -down transistor on st pull-down transistor off v pwmi high - z
data sheet 21 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information 8 application information note: the following information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device. 8.1 output peak current adjustment via r set the external resistor r set is used to adjust the peak current of t he regulator. maximum achievable peak current is 700ma and minimum achievable peak current is 100ma. the set pin provides an internally fixed voltage level at typ.: 1.225v. out of this considerations the equation is: (8.1) the factor 5710 is derived from following considerations: ? ipeak, max = 700ma (r set = 10k ) ? ipeak,min = 100ma (r set = 70k ) internal comparator volt age at set pin = 1.225v. the circuitry behind the set pin is adjusting higher peak currents with lower rset values. the r set value should be in the range from 10k to 70k to achieve the requested peak current range. the following setup applies for the table displayed in figure 8-1 : v rec =12v, v led =7.2v, l sw =220h. figure 8-1 r set resistor selection 5710 225 . 1 ? ? ? ? ? ? ? ? ? = set r v ipeak i peak [ma] r set [k ? ] 100 200 300 400 500 600 700 70 35 23 18 14 12 10
data sheet 22 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information 8.2 switching frequency determination with the external r freq , c freq and r comp network, it is possible to adjust the switching frequency of the regulator. to ensure a stable frequency over a broad range of input voltage v rec an external resistor r comp can be used. the following setup applies fo r the table displayed in figure 8-3 : v rec =12v, v led =7.2v, l sw =220h, r set =14k . figure 8-2 setting t off time of regulator with external r freq , c freq network figure 8-3 r freq , c freq versus f sw table 7 gnd 6 freq tld5045 r freq c freq 1 vrec r comp r comp r freq c freq f sw t off 255.8k 17.1k 220pf 50khz 6.47 s 115.8k 7.7k 220pf 100khz 3.19 s 69.7k 4.6k 220pf 150khz 2.12 s 46.8k 3.1k 220pf 200khz 1.59 s 72.8k 4.9k 100pf 250khz 1.27 s 52.7k 3.5k 100pf 300khz 1.06 s
data sheet 23 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information figure 8-4 theoretical operating waveforms v en t down t t t t high low v freq i led v sw v freq,high v freq,low i set =i peak v rec +v fw v drop transistor diode t diode t diode t diode t diode t up t on t off i min i ripple
data sheet 24 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information 8.3 tld5045ej in different led applications 8.3.1 tld5045ej in a body control modul e (bcm) with c interface figure 8-5 provides a simplified application with two high br ightness leds in series. a c is controlling the en pin to put the device into sleep/active mode. also the pwmi pin can be directly controlled via a c port if pwm dimming of the led current is required . the open load st pin monitors th e load condition of the application and gives feedback to the c. an ex ternal pull up resistor is recommended to achieve a logic high signal during an open load error (internal status transistor is switched off and the st pin is high ohmic an external pull up resistor ensures a logic high signal). the external low power resistor r set is used to set the required peak current for the led load (refer to figure 8-1 for more details). to set the desired switching frequency of the buck regulator the external r freq and c freq network must be connected to gnd (reference values are given in figure 8-3 ). figure 8-5 simplified application diagram tld5045ej note: this is a very simplified example of an application circuit. the function must be verified in the real application sw gnd freq pwmi st en vrec 5 6 7 8 1 4 3 2 tld5045 l sw c freq r freq r set c rec vs = 5v to 40v pwm dimming via c open load status connected to c i led set connect to c pin v dd r comp v rec r emc r st
data sheet 25 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information 8.3.2 decentralized light module applicat ion - dlm (input configuration 1) the connection between the body control module (bcm) and the decentralized light module is realized via one supply line and one gnd connection. the supply line could change between two different operation modes: 1. light function 1 - daytime running light (drl) mode: if the supply line is permanently on, the drl application which requires higher led curr ent (e.g. 400ma) is ac tive. the proper r set resistor should be placed to achieve the desi red load current (e.g 18k ). 2. light function 2 - position light (pl) mode: during a pwm signal (e.g. 200hz) on the supply line the mean led current is reduced to a lower level (e.g. 50ma) and the application is entering into pl mode. the enable pin of the tld5045ej is a high voltage pin (max. 45v) and can be directly conne cted via a resistor ren before the reverse polarity protection diode of the module to achieve a fast capture of the pwm signal. the pwmi pin is connected to gnd (inverse logic = on). to simulate a module current during light load conditions, the st pin can be connected via a resistor to the supply voltage line. (refer to chapter 7 for a detailed description of the st behavior) for a decentralized solution without micro controller in volvement the possibility to connect a ptc resistor at the set pin is a cost effective solution to protect the led load from thermal destruction. figure 8-6 application diagram of decentralized li ght module without c (input config 1) note: this is a very simplified example of an application circuit. the function must be verified in the real application sw gnd freq set st pwmi vrec 4 6 7 8 1 3 5 2 tld5045 c freq r freq r set i st,pd vbat bcm - module wire harness inductance light function 1 (e.g. drl) gnd i open_load i led decentralized light module en c rec r ptc r comp v rec l sw r en
data sheet 26 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information 8.3.3 decentralized light module applicat ion - dlm (input configuration 2) in this particular input configuratio n two supply lines are tied together on the dlm. the following input states must be considered to distinguish between light function 1 (drl mode ) and light function 2 (pl mode). 1. 1) condition: drl = on, pl = off. desired function: drl mode (e.g . 400ma led load current) 2. 2) condition: drl = off, pl = on. desired function: pl mode (e.g . 50ma led load current) 3. 3) condition: drl = on, pl =on. desired fu nction: pl mode (e.g. 50ma led load current) to achieve a lower mean led load current during the pl mode the integrated pwm engine is a useful feature. the external rpwm and cpwm circuit predefines a dedicated pwm frequency and duty cycle. (for details refer to figure 8-2 ) to simulate a module current during light load conditions the st pin ca n be connected via resistors to both supply voltage lines. (refer to chapter 7 for a detailed description of the st behavior) for a decentralized solution without micro controller in volvement the possibility to connect a ptc resistor at the set pin is a cost effective solution to pr otect the led load from thermal destruction. figure 8-7 application diagram of decentralized li ght module without c (input config 2) note: this is a very simplified example of an application circuit. the function must be verified in the real application sw gnd freq set st pwmi vrec 4 6 7 8 1 3 5 2 tld5045 c freq r freq r set i st,pd vbat vbat bcm - module wire harness inductance light function 1 (e.g. drl) light function 2 (e.g. pl) gnd r pwm c pwm i open_load i led decentralized light module en c rec r ptc r comp v rec l sw r en t dim1 t dim2 r dim 1
data sheet 27 revision 1.0 2015-05-28 infineon? litix? power tld5045ej application information 8.3.4 decentralized light module applicat ion - dlm (input configuration 3) a permanent supply chooses the light function 1 (drl mode) and a second dedicated pwm supply between 100hz and 200hz switches to light functi on 2 (pl mode). for this input conf iguration it is possible to connect the pwm dimming output of the bcm directly to the pwmi input of the tld5045ej. to simulate a module current during light load conditions the st pin can be connected via a resistor to the permanent supply voltage line. (refer to chapter 7 for a detailed description of the st behavior) for a decentralized solution without micro controller in volvement the possibility to connect a ptc resistor at the set pin is a cost effective solution to protect the led load from thermal destru ction. (for details refer to figure 8-6 ) figure 8-8 application diagram of decentralized li ght module without c (input config 3) note: this is a very simplified example of an application circuit. the function must be verified in the real application sw gnd freq set st pwmi vrec 4 6 7 8 1 3 5 2 tld5045 l sw c freq r freq r set i st,pd vbat bcm - module wire harness inductance gnd i open_load i led decentralized light module en c rec r ptc vbat light function 1 (e.g. drl) light function 2 (e.g. pl) r comp v rec r emc r en r lim d lim
data sheet 28 revision 1.0 2015-05-28 infineon? litix? power tld5045ej package outlines 9 package outlines figure 9-1 outline pg-dso-8 ep 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). pg-dso-8-27-po v01 14 85 8 14 5 8x 0.41 ?.09 2) m 0.2 d c a-b 1.27 c stand off +0 -0.1 0.1 (1.45) 1.7 max. 0.08 seating plane c a b 4.9 ?.1 1) a-b c 0.1 2x 3) jedec reference ms-012 variation ba 1) does not include plastic or metal protrusion of 0.15 max. per side 2) dambar protrusion shall be maximum 0.1 mm total in excess of lead width bottom view ?.2 3 ?.2 2.65 0.2 ?.2 d 6 m d 8x 0.64 ?.25 3.9 ?.1 1) 0.1 0.35 x 45? cd2x +0.06 0.19 8 ? max. index marking
data sheet 29 revision 1.0 2015-05-28 infineon? litix? power tld5045ej revision history revision 1.0, 2015-05-28 page or item subjects (major changes since previous revision) responsible date rev1.0 initial data sheet for tld5045ej 2011-05-27
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