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general description the MAX8608Y/max8608z dual led drivers use a sin-gle inductor to provide two outputs for either organic led (oled) power or white led (wled) drive in dual- display cell phones. each output can be configured for either voltage regulation (adjustable up to 26v) for oled or current regulation (adjustable up to 40ma) for wled. the topology integrates a single 1mhz/500khz pwm step-up converter and two output load switches to mini- mize size and external components and maximize effi- ciency. each output (outa, outb) is enabled by individual logic inputs for simplicity; however, if ena is high, enb is overridden and outb becomes disabled. a single ctrl input accepts either an analog or direct- pwm dimming signal for proportional control of the out- put voltage or current. internal lowpass filtering eliminates the need for any external filters at ctrl while maintaining low input and output ripple under all conditions. the MAX8608Y features a t a derating function to avoid overdriving the leds during high ambient tempera-tures, enabling higher drive current below +40?. other features shared by both devices include soft-start, out- put overvoltage protection, output overcurrent/short-cir- cuit protection, output true shutdown, and thermal shutdown. the MAX8608Y/max8608z are available in a space- saving, 14-pin, 3mm x 3mm tdfn lead-free package. applications oled power and/or white led backlightscell phones and smartphones pdas, palmtops, and wireless handhelds features ? for dual displays oled + oledwhite led + oled white led + white led ? two outputs share one inductor and oneschottky diode ? output true shutdown ? over 83% efficiency at 13v to 20v/10ma to 20ma ? up to 900mw output power ? flexible analog or pwm dimming control ? selectable 1mhz or 500khz pwm operation ? temperature derating (MAX8608Y) ? small, low-profile external components ? 26v output overvoltage protection ? optimized for low input/output ripple ? soft-start eliminates inrush current MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds ________________________________________________________________ maxim integrated products 1 MAX8608Y/ max8608z 15 432 pgnd ena 6 9 10 11 12 13 14 in fsel ctrl 7 gnd enb outa outb lxovp fbb 8 comp fba top view 3mm x 3mm x 0.8mm tdfn + pin configuration ordering information 19-3881; rev 0; 10/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part pin-package top mark pkg code MAX8608Yetd+ 14 tdfn 3mm x 3mmt1433-2 ann t1433-1 max8608zetd+ 14 tdfn 3mm x 3mmt1433-2 ano t1433-1 note: all parts are specified in the -40? to +85? extended temperature range. + denotes lead-free package. true shutdown is a trademark of maxim integrated products, inc. downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. in to gnd .................................................................-0.3v to +7v pgnd to gnd .......................................................-0.3v to +0.3v lx to gnd.................................................-0.3v to (v ovp + 0.3v) ovp, outa, outb to gnd....................................-0.3v to +30v ctrl to gnd...................-0.3v to the lower of +7v or (v in + 2v) comp, fba, fbb, fsel, ena, enb to gnd ....................................-0.3v to (v in + 0.3v) i lx ......................................................................................1a rms continuous power dissipation (t a = +70?) 14-pin tdfn 3mm x 3mm (derate 18.2mw/? above +70?)..............................................................1454mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics(v in = 3.0v, v ovp = 20v, l1 = 22?, c ovp = 1?, c comp = 0.01?, r comp = 10k ? , r sense = 13 ? , v ctrl = 1.6v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter conditions min typ max units supply voltage 2.7 6.0 v uvlo threshold v in rising or falling 2.05 2.38 2.70 v uvlo hysteresis 140 mv quiescent current no switching 0.4 0.8 ma t a = +25? 0.01 1 shutdown supply current ctrl = gnd,ovp = in t a = +85? 0.01 ? ovlo threshold v ovp rising 26 27 28 v ovlo hysteresis 2v v ovp = 26v, ena = in 30 50 75 t a = +25? 0.01 1 ovp input bias current ovp = in, ena =enb = gnd t a = +85? 0.01 ? thermal protection typical hysteresis = 20? +160 ? output voltage range (note 2) (v in - v d1 ) 26 v ena, enb, fsel logic input-voltage high v in = 2.7v to 6v 1.4 v ena, enb, fsel logic input-voltage low v in = 2.7v to 6v 0.6 v t a = +25? 0.01 1 ena, enb, fsel inputleakage v logic = 6v t a = +85? 0.01 ? error amplifier ctrl to fba/fbb regulation v ctrl = 1.5v, v in = 2.7v to 6v, t a = +25? 0.295 0.300 0.305 v t a = +25? 0.01 1 fba, fbb input bias current v fba or v fbb = v ctrl / 5 t a = +85? 0.2 ? ctrl input resistance v ctrl 1.0v, t a = -40? to start of t a derating function 290 500 780 k ? derating function starttemperature MAX8608Y, v ctrl = 3.0v, ena = in +40 ? derating function slope MAX8608Y, v ctrl = 3.0v, ena = in, t a = start of t a derating to +85? -5.8 mv/? downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds _______________________________________________________________________________________ 3 electrical characteristics (continued)(v in = 3.0v, v ovp = 20v, l1 = 22?, c ovp = 1?, c comp = 0.01?, r comp = 10k ? , r sense = 13 ? , v ctrl = 1.6v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter conditions min typ max units max8608z 310 327 345 MAX8608Y, ena = gnd, enb = in 310 327 345 mv fb_ maximum voltage clamp v ctrl = 3v MAX8608Y, ena = in , t a +25? 322 340 358 fba, fbb to comptransconductance v comp = 1.5v, t a = -40? to start of derating function 30 60 90 ? comp input resistance to gnd in shutdown or overvoltage lockout 20 k ? oscillator fsel = gnd 0.77 1.0 1.25 mhz operating frequency fsel = in 385 500 660 khz maximum duty cycle ctrl = in, fba = fbb = gnd 92 96 % minimum duty cycle in regulation at light loads 14 % lx, outa, outb switches lx on-resistance 1.2 2.4 ? t a = +25? 0.01 1 lx leakage current v lx = 28v, ctrl = gnd t a = +85? 1 ? lx current limit duty cycle = 90%, t a = -40? to +85? 500 700 900 ma outa and outb switch on-resistance 71 4 ? outa and outb current limit 150 300 450 ma t a = +25? 0.01 1 outa off-leakage ena = gnd, enb= in, v ovp = 25v, v outa = 0v t a = +85? 1 ? t a = +25? 0.01 1 outb off-leakage ena = in, enb =gnd, v ovp = 25v, v outb = 0v t a = +85? 1 ? fsel = gnd 8 ovp cap discharge time fsel = in 16 ms note 1: all devices are 100% production tested at t a = +25?. specifications over the operating temperature range are guaranteed by design and characterization. note 2: v d1 is the diode forward-voltage drop of diode d1 in figure 1. downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds 4 _______________________________________________________________________________________ typical operating characteristics (circuit of figure 1, v in = 3.6v, i led = 20ma, l1 = 22?, c ovp = 1?, c comp = 0.01?, r sense = 13 ? , v ctrl = 1.5v, 4 leds, t a = +25?, unless otherwise noted.) 50 60 8070 90 100 2.0 3.0 4.0 5.0 6.0 led efficiency vs. input voltage (500khz) max8608toc01 input voltage (v) efficiency?p led /p batt (%) 4 leds 6 leds 50 60 8070 90 100 01 0 1 5 52 0 2 5 3 0 led efficiency vs. load current (500khz) MAX8608Y toc02 load current (ma) efficiency? p led /p batt (%) v in = 3.6v 4-led load v in = 4.2v v in = 3v 50 60 8070 90 100 01 0 1 5 5 202530 led efficiency vs. load current (500khz) MAX8608Y toc03 load current (ma) efficiency? p led /p batt (%) v in = 3.6v 6-led load v in = 4.2v v in = 3v 100 0 0.1 100 efficiency vs. load current (1mhz) 30 7040 8050 9010 20 60 MAX8608Y toc04 load current (ma) efficiency (%) 11 0 v outb = 25v v outb = 18v v outb = 12v 100 0 0.1 100 efficiency vs. load current (500khz) 30 7040 8050 9010 20 60 MAX8608Y toc05 load current (ma) efficiency (%) 11 0 v outb = 18v v outb = 25v v outb = 12v 500 600 900700 1100 800 1000 1200 2.5 3.5 4.0 3.0 4.5 5.0 5.5 switching frequency vs. input voltage MAX8608Y toc06 input voltage (v) switching frequency (khz) t a = +85 c t a = +25 c t a = -40 c wled power-up waveform MAX8608Y toc07 10v/div20mv/div 200mv/div 5v/div outa in fba ena 2ms/div wled entering shutdown waveform MAX8608Y toc08 10v/divch1 high 4.00v ch1 low -200mv 20mv/div200mv/div 5v/div outa in fba ena 2ms/div downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds _______________________________________________________________________________________ 5 oled power-up waveforms MAX8608Y toc09 10v/div50mv/div 5v/div outb in enb 2ms/div oled shutdown waveforms MAX8608Y toc10 10v/div50mv/div 2v/div outb in enb 2ms/div switching waveforms MAX8608Y toc11 10v/div200mv/div 50mv/div 100mv/div lx il in ovp 400ns/div line transient MAX8608Y toc12 500v/div50mv/div 200mv/div in fb_ ovp 200 s/div wled vctrl step response MAX8608Y toc13 2v/div200mv/div 500mv/div outa fba ctrl 200 s/div oled vctrl step response MAX8608Y toc14 5v/div500mv/div outb ctrl 1ms/div oled load transient response MAX8608Y toc15 500mv/div30ma 10ma outb i load 4ms/div typical operating characteristics (continued) (circuit of figure 1, v in = 3.6v, i led = 20ma, l1 = 22?, c ovp = 1?, c comp = 0.01?, r sense = 13 ? , v ctrl = 1.5v, 4 leds, t a = +25?, unless otherwise noted.) downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds 6 _______________________________________________________________________________________ pin description pin name function 1 in input voltage supply. connect a 2.2? capacitor from in to pgnd. 2 pgnd power ground. connect to the exposed paddle directly underneath the ic. 3 fsel frequency select input. drive fsel low or connect to gnd for a 1mhz operating frequency. drivefsel high or connect to in for a 500khz operating frequency. 4 ena outa enable input. drive ena high to turn on outa. drive ena low to turn off outa. when ena ishigh, it overrides enb and shuts down outb regardless of the state of enb. when both ena and enb are low, the ic enters low-power shutdown. 5 enb outb enable input. when ena is low, drive enb high to turn on outb or drive enb low to turn offoutb. if ena is high, enb is a ?on? care?and outb is off. when both ena and enb are low, the ic enters low-power shutdown. 6 ctrl control input. the voltage applied to ctrl controls the wled output current or the oled outputvoltage. varying the ctrl voltage from 0 to 1.65v adjusts the output current (or voltage) from low to high, respectively. any voltage above 1.65v does not increase the output. 7 gnd ground. connect to the exposed paddle directly underneath the ic. 8 comp compensation input. connect a 0.01? capacitor (c comp ) and a 10k ? resistor (r comp ) in series from comp to gnd. these components stabilize the converter and control soft-start. comp internallyconnects to gnd when in shutdown or overvoltage-protection mode. 9 fbb feedback input for outb. connect a resistor from fbb to gnd to set the led bias current. thevoltage at fbb regulates to v ctrl / 5 or 0.33v, whichever is lower. for voltage-feedback operation, connect fbb to the center of a resistor-divider connected between outb and gnd. 10 fba feedback input for outa. connect a resistor from fba to gnd to set the led bias current. thevoltage at fba regulates to v ctrl / 5 or 0.33v, whichever is lower. for voltage-feedback operation, connect fba to the center of a resistor-divider connected between outa and gnd. 11 outb output of regulator b. when enb is high, ovp is internally connected to outb through a 7 ? mosfet. outb is high impedance when enb is low. outb is high impedance if ena is high,regardless of the state of enb. 12 ovp overvoltage sense and boost output. when v ovp is greater than 27v, the internal n-channel mosfet turns off until v ovp drops below 25v, then the ic reenters soft-start. connect a 1? capacitor from ovp to pgnd. 13 outa when ena is high, ovp is internally connected to outa through a 7 ? mosfet. outa is high impedance when ena is low. 14 lx inductor connection. during shutdown, lx is high impedance. ep exposed paddle. connect directly to gnd and pgnd underneath the ic. downloaded from: http:///
detailed description the max8608? high efficiency and small size make itideally suited to drive any combination of oled and/or wleds in dual-display cell phones. it operates as a pwm boost dc-dc converter with two internal load switches to power two independent displays. each out- put can be configured for current or voltage regulation. the feedback input regulates at v ctrl / 5 or 330mv (max), whichever is lower. in current regulation, themax8608 provides even illumination by sourcing the same output current through each led, eliminating the need for expensive factory calibration. the max8608 can also function as a voltage supply by connecting a voltage-divider from either outa or outb to its corre- sponding feedback input. MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds _______________________________________________________________________________________ 7 r1360k ? r26k ? r sense 13 ? up to 26v up to 6 leds fbbfba lx d1 l122 h c ovp 1 f up to 28v c in 2.2 f outa outb enable gnd 100k ? dac or pwm ctrl 121k ? 279k ? v clamp 1.25 + - g m slope comp current sense fsel pwm control overvoltage protection current limit mux in pgnd ovp comp 2.7v to 6v enaenb r comp 10k ? c comp 0.01 f 1000pf MAX8608Y/ max8608z figure 1. functional diagram and typical applications circuit downloaded from: http:///
MAX8608Y/max8608z the fast 1mhz internal oscillator allows for a smallinductor and small input and output capacitors while minimizing input and output ripple. for higher efficiency at the expense of larger components, a logic input may select 500khz operation. at light loads, the max8608 operates in pfm mode to maximize efficiency. a soft- start gradually illuminates the leds, reducing the inrush current during startup. the single analog control input allows easy adjustment of wled current or oled voltage. the control input is internally filtered to allow for either simple analog volt- age control or direct-pwm duty-cycle control while maintaining low input/output ripple. in shutdown, sup- ply current is reduced to a low 0.01?. enable and output control the max8608? outputs are enabled by the ena andenb inputs, which also turn on and off the part? inter- nal bias circuitry. ena is the dominant input. table 1 shows the truth table for these inputs. each output is protected against short circuit to ground by an internal current limit (300ma typ). if an output becomes current limited, the corresponding output switch turns off, the c comp is discharged to ground, and the soft-start sequence is reinitiated. soft-start the max8608 attains soft-start by charging c comp gradually with a current source. when v comp rises above 1.5v, the internal mosfet begins switching, butat a reduced duty cycle. when v comp rises above 2.25v, the duty cycle is at its maximum. see the typical operating characteristics for examples of soft-start operation with wled and oled loads. shutdown the max8608 enters shutdown when ena and enb arelow. in shutdown, supply current is reduced to 0.01? by powering down the entire ic. c comp is discharged during shutdown, allowing the device to reinitiate soft-start when the device is enabled. also, the internal switches from ovp to outa and outb are turned off so no current can pass to the loads. overvoltage protection overvoltage lockout (ovlo) occurs when v ovp is above 27v (typ). the protection circuitry stops the inter-nal mosfet from switching and causes v comp to decay to gnd. the device comes out of ovlo and intosoft-start when v out falls below 25v (typ). ambient temperature derating function (MAX8608Y only) the MAX8608Y limits the maximum led current ofouta depending on the die temperature. v fba is limit- ed to 340mv up to +40?. once the temperaturereaches +40?, the maximum v fba declines by 5.8mv/?. due to the package? exposed paddle, thedie temperature is always very close to the pc board temperature. the temperature derating function matches the charac- teristic in popular wled data sheets and allows the led current to be safely set higher (25ma typ) at nor- mal operating temperatures, thereby allowing either a brighter display or fewer leds to be used for normal display brightness. design procedure adjusting wled current adjusting the max8608? output current changes thebrightness of the leds. an analog input (ctrl) and the sense resistor value sets the output current. output cur- rent is given by: the v ctrl voltage range for adjusting output current is 0 to 1.65v. to set the maximum current, calculater sense when v ctrl is at its maximum as follows: power dissipation in r sense is typically less than 10mw; therefore, a standard chip resistor is sufficient. r xi sense led max = 165 5 . () i v xr led ctrl sense = 5 high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds 8 _______________________________________________________________________________________ ena enb outa outb boost bias 0 0 hi-z hi-z off 0 1 hi-z on on 1 0 on hi-z on 1 1 on hi-z on table 1. truth table for the enable inputs downloaded from: http:///
adjusting oled bias output voltage adjusting the max8608? output voltage changes theoled bias headroom. an analog input (ctrl) and a resistor voltage-divider set the output voltage. the reg- ulation voltage at fb_ is given by: v fb_ = v ctrl / 5 the v ctrl voltage range for adjusting output voltage is 0 to 1.65v. applying v ctrl voltage above 1.65v does not increase the output voltage any further. to set the maxi-mum output voltage, choose a value for r2 (figure 1) between 1k ? and 10k ? and then calculate r1 when v ctrl is at its maximum as follows: r1 = r2 ((v out / 0.33) - 1) for loop stability and good transient response, place afeed-forward capacitor (1000pf typ) in parallel with r1. the feed-forward capacitor value is not critical. calculate the approximate value as: pwm dimming control when both out1/fb1 and out2/fb2 are configuredfor current regulation for wled loads, ctrl can also be used as a digital input, allowing led brightness control with a logic level (greater than 1.65v) pwm sig- nal applied directly to ctrl. use a 200hz to 200khz frequency range. a 0% duty cycle corresponds to full current. the error amplifier and compensation network form a lowpass filter such that pwm dimming results in dc current to the leds without the need for any addi- tional rc filters. for this to work correctly, change the compensation network to a 0.1? capacitor from comp to gnd (with r comp = 0 ? ). capacitor selection the exact values of input and output capacitors are notcritical. the typical value for the input capacitor is 2.2?, and the typical value for the output capacitor is 1?. larger-value capacitors can be used to reduce input and output ripple, but at the expense of size and higher cost. c comp stabilized the converter and controls soft- start. connect a 10k ? resistor and 0.01? capacitor in series from comp to gnd. for applications with bothoutputs configured for wled current regulation, change the compensation network to a 0.1? capacitor from comp to gnd (with r comp = 0 ? ). inductor selection inductor values range from 10? to 47?. when using1mhz operation, a 22? inductor optimizes the efficien- cy for most applications. when using 500khz opera- tion, a 47? inductor optimizes the efficiency for most applications. with input voltages near 5v, a larger value of inductance may be more efficient. to prevent core saturation, ensure that the inductor saturation current rating exceeds the peak inductor current for the appli- cation. calculate the peak inductor current for 1mhz switching with the following formula: schottky diode selection the max8608? high switching frequency demands ahigh-speed rectification diode (d1) for optimum effi- ciency. a schottky diode is recommended due to its fast recovery time and low forward-voltage drop. ensure that the diode? average and peak current rat- ing exceed the average output current and peak induc- tor current. in addition, the diode? reverse breakdown voltage must exceed v ovp . the rms diode current can be calculated from: applications information pc board layout due to fast-switching waveforms and high currentpaths, careful pc board layout is required. an evalua- tion kit (MAX8608Yevkit) is available to aid design. when laying out a board, minimize trace lengths between the ic and r sense (and/or feedback resis- tors), the inductor, the diode, the input capacitor, andthe output capacitor. keep traces short, direct, and wide. keep noisy traces, such as the lx node trace, away from fba and fbb. the in bypass capacitor (c in ) should be placed as close to the ic as possible. pgnd and gnd should be connected directly to theexposed paddle underneath the ic. the ground con- nections of c in and c ovp should be as close together as possible. the traces from in to the inductor andfrom the schottky diode to the leds may be longer. ii x i diode rms out peak () _ ? i vx i xv vxs xl peak out max led max in min in min =+ _( ) ( ) () () . . 08 08 2 c e r ff ? 5 2 6 MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds _______________________________________________________________________________________ 9 downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds 10 ______________________________________________________________________________________ 2 to 6 white leds for lcd displays fbb fba lx ovp 1 f 22 h 2.2 f outa outb gnd inpgnd fsel enable a*enable b* input 2.7v to 6v 500khz 1mhz main display (lcd or oled) subdisplay (lcd or oled) oled bias adjustable to 25v at 40ma MAX8608Y max8608z ena enb analog or pwm dimming *only one output enabled at a time by internal logic. ena has priority. no r-c needed 200hz to 200khz ctrl comp typical operating circuit chip information process: bicmos downloaded from: http:///
MAX8608Y/max8608z high-efficiency, 26v step-up converters for main and subdisplays using oleds and/or white leds maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) 6, 8, &10l, dfn thin.eps l c l c pin 1 index area d e l e l a e e2 n g 1 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm -drawing not to scale- k e [(n/2)-1] x e ref. pin 1 id 0.35x0.35 detail a b d2 a2 a1 common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.101.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref -drawing not to scale- g 2 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm downbonds allowed nono no no yes no yes no downloaded from: http:///

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