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mp4012 high-brightness, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 1 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the mp4012 is a current mode controller designed for driving the high brightness light emitting diodes (leds) from extremely wide input voltage 8v~55v. it can be used in boost, buck, buck-boost and sepic topologies. the mp4012 drives external mosfet with fixed frequency/constant off-time architecture to regulate the led current, which is measured through an external current sense resistor. its feedback voltage can be adjusted by the external dc bias voltage. the mp4012 can work in constant frequency operation mode or constant off time mode. it features programmable slop compensation that can optimize the control loop regulation and avoid sub harmonic oscillation. the mp4012 implements high frequency pwm dimming with external disconnect mosfet. it achieves analog dimming by adjusting the feedback voltage. the mp4012 has synchronizing function, which makes multiple ics synchronized to each other by connecting sync pins together. the mp4012 includes under-voltage lockout, over voltage protection, open and short hiccup mode protection, overload protection and thermal protection to prevent damage in the case of fault condition. the mp4012 is available in a 16-pin soic package. features ? constant-current wled controller ? 8v~55v input voltage ? constant frequency mode or constant off time mode ? programmable switching frequency or off- time ? leading edge blanking for current sense ? high frequency pwm dimming and analog dimming ? output-to-input disconnect in shutdown mode ? synchronization function ? programmable over voltage protection ? open load hiccup mode protection ? short load hiccup mode protection ? programmable current limit ? uvlo, thermal shutdown ? soft start ? available in 16-pin soic package applications ? lcd backlighting applications ? dc/dc led controller applications ? general illumination ? industrial lighting ? automotive/ decorative led lighting all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithi c power systems, inc.
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 2 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application vdd fb sync ovp rt cl ref cs gnd iset fault gate vin sl comp pwm l1 v in c in m1 c out r ovp1 r ovp2 r fb r sl r t c dd c comp c ref r cl2 r cl1 r set1 r set2 r sc r cs pwm dim d1 m2 sync 1 2 13 8 14 10 9 15 3 5 4 12 11 16 6 7
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 3 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) MP4012DS soic16 mp4012 -40 c to +85 c *for tape & reel, add suffix ?z (e.g. MP4012DS?z); for rohs, compliant packaging, add suffix ?lf (e.g. MP4012DS?lf?z). package reference absolute maxi mum ratings (1) v in ................................................ -0.5v to 60v v dd ................................................-0.5v to 13.5v v gate, v fault, v pwm , v rt ..........-0.5v to v dd +0.3v all other pins ...............................-0.3v to 6.5v junction temperature ...............................150 c lead temperature ....................................260 c continuous power dissipation (t a = +25c) (2) ............................................................ 1.6 w recommended operating conditions (3) in supply voltage v in .........................8v to 55v operating junction temp. (t j ).-40c to +125c thermal resistance (4) ja jc soic16................................... 80 ...... 30... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb. top view vin 1 vdd 2 gate 3 gnd 4 cs 5 sl 6 rt 7 sync 8 9 cl 10 ref 11 fault 12 ovp 13 pwm 14 comp 15 iset 16 fb
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 4 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics v in =24v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units operating input voltage v in 8 55 v vdd voltage v vdd v in 8v 7.25 7.75 8.15 v supply current (shutdown) i sd v pwm = 0v 0.8 1.0 ma vdd under voltage lockout uvlo v dd rising 6.40 6.70 7.20 v under voltage lockout hysteresis 500 mv vdd(external) connect external dc voltage 12 v internal regulator reference voltage v ref 1.218 1.243 1.268 v reference line regulation v refline 0.1 f bypassed capacitor, i ref =0 v dd =7.25-12v 0 20 mv reference load regulation v refload 0.1 f bypassed capacitor, i ref =0-500ua 0 13 mv pwm dimming pwm low threshold v pwmi-lo v pmwi falling 0.8 v pwm high threshold v pwmi-hi v pmwi rising 1.5 v pwm pull-down resistance r pwm 50 100 150 k ? gate gate short circuit current i source v gate =0v, v dd =7.75v 0.2 0.4 a gate sink current i sink v gate =7.75v, v dd =7.75v 0.4 0.7 a gate output rise time t rise c gate =1nf, v dd =7.75v 50 85 ns gate output fall time t fall c gate =1nf, v dd =7.75v 25 45 ns current sense leading edge blanking t blank 100 250 ns delay to output of comp comparator t delay1 200 ns delay to output of c limit comparator t delay2 200 ns comparator offset voltage v offset -25 25 mv oscillator oscillator frequency f osc1 r t =96k ? 510 580 650 khz oscillator frequency f osc2 r t =500k ? 100 115 130 khz maximum duty cycle d max 90 92 95 % sync input high v synch 1.5 v sync input low v syncl 0.8 v sync output current i sync 16 a slope compensation current source out of sl pin i slope 0 95 a internal current mirror ratio g slope i slope =50 a, r sl =1k ? 1.8 2.0 2.2 over voltage protection ovp threshold v ovp-th 4.60 4.95 5.30 v ovp threshold hysteresis 500 mv
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 5 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics (continued) v in =24v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units output short circuit protection gain for short circuit comparator g sc 1.8 2.0 2.2 propagation time for short circuit detection t off i set =200mv, fb=450mv, fault goes form high to low 250 ns fault output rise time t rise 330pf capacitor at fault pin 300 ns fault output fall time t fall 330pf capacitor at fault pin 200 ns short circuit detecting blanking time t sc_bt 500 950 ns current source/sink at comp pin for hiccup mode protection i hiccup 5.0 a thermal shutdown (5) 150 c notes: 5) guaranteed by design
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 6 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics performance waveforms are tested on the evaluation board of typical application circuit (figure 5). v in = 64v, 12vin=12v, i led = 120ma, vled=200v, 66wleds in series, t a = 25c, boost application, unless otherwise noted. pwm duty pwm dimming curve 0 20 40 60 80 100 120 140 0 0.2 0.4 0.6 0.8 1 v ds 100v/div. v comp 5v/div. v out 100v/div. i l 500ma/div. v ds 100v/div. v comp 5v/div. v out 100v/div. i led 100ma/div. steady state soft start pwm dimming v ds 100v/div. v pwm 5v/div. v out 100v/div. i led 100ma/div. ovp recovery short load recovery v ds 100v/div. v comp 5v/div. v out 100v/div. i l 500ma/div. v ds 100v/div. v comp 5v/div. v out 100v/div. i led 100ma/div. v in (v) efficiency vs. v in 90.00 91.00 92.00 93.00 94.00 95.00 96.00 97.00 50 60 70 80 90
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 7 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name pin function 1 vin input supply pin. it is the input of inte rnal linear regulator. must be locally bypassed. 2 vdd the internal linear regulator output pin. v dd provides power supply for the external mosfet gate driver and the internal control circuitry. bypass vdd to gnd with a 0.47 f or larger ceramic capacitor. 3 gate external mosfet gate driver pin. 4 gnd ground. 5 cs switch current sense input pin. it is used to sense the current of the external power fet. it has a built-in 100ns (min) blanking time. 6 sl slope compensation pin for current sense. connecting a resistor between sl and gnd programs the slope compensation. in case of constant off-time mode of operation, slope compensation is unnecessary and let this pin open. 7 rt switching frequency/off-time set pin. a resistor connected between this pin and gnd/gate sets the frequency/off-time. 8 sync synchronization pin. connecting the multiple mp4012 sync pins together to achieve the synchronous working mode. 9 cl current limit set pin. this pin sets the exte rnal mosfet current limit. the current limit can be set by using a resistor divider from the ref pin to gnd. 10 ref reference output pin. a 0.1 f or larger ceramic capacito r should be connected to bypass this pin to gnd. 11 fault fault indication output pin. this pin is pulled down to gnd in case of short circuit condition or over voltage condition. it is al so used to drive the external mosfet to disconnect the load from vin for boost converter. 12 ovp over voltage protection input pin. connect a re sistor divider from output to this pin to program the ovp threshold. when the voltage of this pin reaches 4.95v, the mp4012 triggers over voltage protection. 13 pwm pwm dimming input pin. apply a pwm signal on this pin for brightness control. the gate is disabled when pwm signal is low. the gate is enabled when pwm signal is high. 14 comp converter compensation pin. this pin is used to compensate the regulation control loop. connect a capacitor or a series rc network fr om comp to gnd. comp pin is also used for hiccup timer. at ic start up, short protec tion or over voltage protection, the 5ua current source charges comp pint until 5v, and then the 5 a current source discharges comp voltage. ic is active when comp voltage reduces to 1v. 15 iset led current set pin. connect a resistor di vider from ref pin to set the led current reference. the analog dimming function can be achieved through adjusting the voltage on iset pin. 16 fb feedback input pin. connect a current sense resistor from fb to gnd. the mp4012 regulates the voltage across the current sense resistor. the regulation voltage is set by iset pin.
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 8 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the mp4012 drives external mosfet with current mode architecture to regulate the led current, which is measured through an external current sense resistor. figure 1 shows the functional block diagram. mp4012 employs a special circuit for regulating the internal power supply, which covers a wide input voltage from 8v to 55v. the 7.75v linear regulator provides all the power for internal circuits and external mosfet gate drive energy. mp4012 has a 2% accurate 1.25v reference, which is used as the reference for led current. the reference is also used to set the current limit and over voltage threshold. mp4012 can be programmed as constant switching frequency (cf) or constant off time (ct) operation. connecting a resistor between rt pin and gnd sets the switching frequency for cf mode. connecting a resistor between rt pin and gate pin sets the off time for ct mode. for constant switching frequency mode, mp4012 includes a slope compensation section to ensure the converter stability when duty cycle is greater than 0.5. for synchronization, the sync pins of multiple mp4012 can be connected together, and may also be connected to the open drain output of a master clock. when connected in this manner, the oscillators will lock to the device with the highest operating frequency. mp4012 has two high-speed current comparators. one is used during normal operation, which contains an internal 100ns blanking time to prevent the current spike from mis-triggering the comparator. the other is used to limit the maximum switch current, which is programmable by connecting a resistor divider from ref pin. ref vdd r q cs cl s + - + - leb sl reset vin gate fault r qn q en s + - 5v ovp gnd sync rt - + fb iset comp 2 + - pwm linear regulator oscillator hiccup control bandgap thermal por hiccup done hiccup done por por por por en hiccup done reset hold hiccup pwm blank 100k slope compensation por figure 1?functional block diagram
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 9 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. start up the start up process is shown in figure 2. during start up, the comp is charged to 5v first, then it is discharged by an internal current source, mp4012 is active until the comp voltage is discharged to 1v. the high level fault turns on the external disconnected mosfet. the output current is regulated by the converter. 5v vcc fault comp 1v vin iout t hiccup figure 2?start up process analog dimming analog dimming can be accomplished by varying the voltage at the iset pin. this can be done either by using resistor divider from the ref pin or by applying an external dc voltage at the iset pin. pwm dimming pwm dimming can be achieved by applying a square wave signal on pwm pin. the pwm signal controls the internal error amplifier (ea), fault output and gate output. when the pwm signal is high, the gate and fault pins are enabled, and the output of the ea is connected to the external compensation network. so the led current is regulated accurately. when the pwm signal goes low, the gate signal is disable. and the fault pin is pulled down to gnd to turn off the disconnecting mosfet. meanwhile the output of the ea is disconnected from the compensation network. thus, the comp voltage can be hold by external capacitor. and the disconnecting mosfet can prevent the output voltage from being discharged, which helps to achieve the high frequency pwm dimming with better linear dimming performance. protection mp4012 includes short circuit protection and over voltage protection, if the fault conditions are detected (either short circuit or open circuit), the comp pin is disconnected from the internal ea and the gate and fault pins are pulled down to disable the led controller, once the fault is remove, the comp pin is charged by an internal current source until it reaches 5v, then the comp is discharged by an internal current source. when it reaches 1v, the current source is disconnected from comp pin and the internal ea is connected to it, the fault pin starts to go high and the gate pin is allowed to switch.
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 10 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the short circuit threshold current is internally set to 200% of the steady state current. when the output current becomes higher than the short circuit threshold after some delay, the short circuit protection circuit is activated. see figure 3. this allows the led drive system auto-restart in an accident short condition without having to reset the ic. the open load protection is achieved through detecting the ovp pin voltage. when open load fault occurs, the output voltage rises as the output capacitor is still charged. the over voltage protection turns off the mp4012 and takes fault to gnd when the ovp pin exceeds 4.95v. the converter turns on when the output voltage falls below the falling ovp threshold after a hiccup mode delay timer. mp4012 will repeat the process until the open load fault is removed. when recovering from the open load condition, the output current might have some spike which caused by the high output voltage, and trigger the short load protection. but it can enter normal work mode when output voltage is close to the normal value. see figure 4. short load 5v output current fault comp normal current 1v hiccup time short load rec ove r figure 3 ? hiccup mode short load protection 5v out put current fault comp normal current 1v open load ovp-h out put volt age ovp-l vout-normal open load recover t delay t hiccup 1 t hiccup2 figure 4 ? open load protections
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 11 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information switching frequency set an external resistor r t on rt pin can be used to set the switching frequency through the following equation: 9 s t 55.6 10 f r = led current set choose an external current sense resistor (r fb ) to set the led current. iset fb led v r i = here, v iset is led current reference on iset pin, which is set by a resistor divider from ref pin to gnd. it is recommended to add a 0.1uf ceramic capacitor on iset pin to avoid noise injection. over voltage protection set choose a voltage divider (r ovp1 , r ovp2 in typical application) from the output to set the over voltage protection threshold: ovp1 ovp2 ovp ovp2 rr v4.95v r + = slope compensation mp4012 employs peak current mode control which need slope compensation to avoid sub- harmonic oscillation when duty cycle exceeds 50%. to ensure current loop stability, choosing a slope compensation which is at least half of the down slope of inductor current. the slope compensation is set by two external resistors r sl and r sc . the slope compensation resistor can be calculated as: 5 sc sl cs down s rrrs t10 = s down (a/ s) is the down slope of the inductor current. l down v s l = where v l is the voltage across the inductor, and l is the inductor value. t s is the switching period, which is set by the frequency set resistor r t . r cs is the current sense resistor which senses the switch current. it is recommended that the current sense resistor r cs can be chosen to provide 200mv current sense signal (also need to take the power consumption into consideration). the r sl is the slope resistor on sl pin, its value is limited by the maximum source current of sl pin. the minimum value of r sl is 25k ? . 25k ? ? 50k ? of slope resistor value is recommended. current limit current limit value can be set by a resistor divider from ref pin to gnd. the voltage of cl can be set as: sc cl pk cs sl 4.5 r v1.2ir r ? + here, i pk is peak current of inductor. the v cl value should not be greater than 450mv, no capacitor should be connected between cl pin and gnd. hiccup timer if the fault conditions are detected (either short circuit or open circuit), the comp pin is disconnected from the internal ea and the gate and fault pins are pulled down to disable the led controller. once the fault condition is cleared, the comp pin is charged by an internal 5 a current source until it reaches 5v, then the comp is discharged by an internal 5 a current source. when it reaches 1v, the current source is disconnected from comp pin and the internal ea is reconnected to it, the fault pin starts to go high and the gate pin is allowed to switch. the hiccup timer can be programmed by r -c network (r z , c z in series and parallel with c c ) on comp pin. the delay time of startup (figure 2) can be approximately calculated as: hiccup c z 9v t(cc) 5a + in most case the voltage drop on r z can be neglected.
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 12 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the hiccup time of over current protection (figure 3) can be approximately calculated as: comp hiccup c z 9v-v t(cc) 5a + here, v comp is the voltage of comp when fault condition is detected. the hiccup time of over voltage protection (figure 4) can be approximately calculated as: delay ovp1 ovp2 o t0.1(r r)c + comp hiccup1 c z 9v-v t(cc) 5a + hiccup2 c z 8v t(cc) 5a +
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 13 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical appliaction circuit sync 8 cs 5 vdd 2 cl 9 ovp 12 iset 15 rt 7 gnd 4 vin 1 ref 10 pwm 13 fb 16 sl 6 gate 3 fault 11 comp 14 u1 mp4012/so16 c1 c2 c7 l1 d2 us1g c9 33nf c10 220pf c12 3k r12 r4 r6 1.58k r5 nc c5 nc c6 30k r9 560k r8 21k r11 10k r15 4.3k r14 9.09k r13 c13 3.32 r22 21.5k r20 953k r21 2k r16 led+ led- 1k r1 20.5k r2 1nf c4 1k r19 nc r7 vin pwm a-dim sync nc r18 c3 fault 12vin nc r17 ref ref ref m1 m2 220pf c8 100nf c11 nc r3 nc d1 nc r23 nc r24 20 r10 nc c14 nc c15 8 5 2 7 1 3 4 6 cn1 figure 5?mp4012 boost application
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 14 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. vdd fb sync ovp rt cl ref cs gnd iset fault gate vin sl comp pwm l1 v in c in m1 c out r ovp1 r ovp2 r fb r sl r t c dd c comp c ref r cl2 r cl1 r set1 r set2 r sc r cs pwm dim d1 m 2 v dd 12v sync block 2 v in led 1+ led 1- led 2+ led 2- v dd 12v pwm dim sync block n v in led n+ led n- v dd 12v pwm dim sync dc supply 1 2 13 8 14 10 15 97 6 16 11 12 4 5 3 figure 6?typical application circuit for tv led backlighting
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 15 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. vdd fb sync ovp rt cl ref cs gnd iset fault gate vin sl comp pwm l1 c in m1 c out r ovp1 r ovp2 r fb r sl r t c dd c comp c ref r cl2 r cl1 r set1 r set2 r sc r cs pwm dim d1 m2 sync l2 vin c1 1 2 13 8 14 10 15 97 6 16 11 12 4 5 3 figure 7?mp4012 sepic application circuit
mp4012 high-voltage, high-current accuracy wled controller mp4012 rev. 1.12 www.monolithicpower.com 16 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. vdd fb sync ovp rt cl ref cs gnd iset fault gate vin sl comp pwm l1 v in c in m1 c out r ovp1 r ovp2 r sl r t c dd c comp c ref r cl2 r cl1 r set1 r set2 r sc r cs pwm dim d1 sync 1 2 13 8 14 10 9 15 3 5 4 12 11 16 6 7 MP4012DS rg1 vcc shdn gnd rg2 out2 out1 mp8110ds fb fb r fb r g2 r g1 c vcc c out2 r sense 8 2 nc 1 7 3 5 4 6 figure8?mp4012 buck-boost application circuit
mp4012 high-voltage, high-current accuracy wled controller notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp4012 rev. 1.12 www.monolithicpower.com 17 10/12/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information soic16 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o see detail "a" 0.0075(0.19) 0.0098(0.25) 0.150 (3.80) 0.157 (4.00) pin 1 id 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.004(0.10) 0.010(0.25) 0.386( 9.80) 0.394(10.00) 0.053(1.35) 0.069(1.75) top view front view 0.228 (5.80) 0.244 (6.20) side view 1 8 16 9 recommended land pattern 0.213 (5.40) 0.063 (1.60) 0.050(1.27) 0.024(0.61) note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length does not include mold flash, protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming) shall be 0.004" inches max. 5) drawing conforms to jedec ms-012, variation ac. 6) drawing is not to scale. 0.010(0.25) bsc gauge plane

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