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mp4000 offline high brightness white led driver controller mp4000 rev. 1.3 www.monolithicpower.com 1 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the mp4000 is a high efficiency step-down converter designed for driving high brightness light emitting diodes (leds). the mp4000 drives an external mosfet in the floating buck converter structure. the inductor current is regulated with boundary conduction mode which features no reverse recovery loss in the freewheeling diode and soft turn on for the power mosfet. such operation mode can achieve very high efficiency and at the same time minimize the inductor value and size. also, the led current can be well regulated by controlling the mosfet peak current, which is sensed through an external resistor. its low 300mv feedback voltage reduces power loss and improves efficiency. the mp4000 can accept an external pwm or a dc signal for the burst dimming control. the mp4000 features output short protection, maximum switching frequency limit, under- voltage lockout and thermal shut down. features ? constant-current led driver ? power mosfet zero-current turn on ? no freewheeling diode reverse recovery issues ? high efficiency and reliability in boundary mode operation ? low 0.9ma operation current ? pwm or dc input burst dimming control ? hiccup short circuit protection ? uvlo, thermal shutdown ? maximum frequency is limited to 110khz ? available in soic8 package applications ? dc/dc or ac/dc led driver applications ? general illumination ? industrial lighting ? automotive/ decorative led lighting for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp4000 rsense ac input leds cout d l gnd cs drive bos vcc cin c1 mosfet dim dim s1 vsupply + - vout + - vsw cbos z1 d r1
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 2 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ordering information part number package top marking free air temperature (t a ) MP4000DS soic8 mp4000 -40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP4000DS?z). for rohs compliant packaging, add suffix ?lf (e.g. MP4000DS?lf?z) package reference drive cs bos gnd tst vcc nc dim soic8 absolute maxi mum ratings (1) vcc, drive ...................................-0.3v to 11v dim, bos, cs................................-0.3v to 6.5v continuous power dissipation (t a = +25c) (2) soic8 ........................................................ 1.3w junction temperature ...............................150 c lead temperature ....................................260 c storage temperature............... -55 c to +150 c recommended operating conditions (3) vcc, drive ....................................8v to 10.5v maximum junction temp. (t j ) .............. +125 c thermal resistance (4) ja jc soic8 .....................................96 ...... 45 ... 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 power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shut down 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.
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 3 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. electrical characteristics v cc =10v, v dim = 5v, v bos =0v, no load on pin drive, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units input v cc current (quiescent) i ccqs v dim = 0v 0.6 ma input v cc current (operation) i ccop f sw =50khz, 100pf load on drive 0.9 ma vcc uvlo rising vcc uvlo 7 7.4 7.8 v vcc uvlo hysteresis vcc hys 1 v dim pwm input high v pwmh v bos =1.2v 1.5 v dim pwm input low v pwml v bos =1.2v 0.9 v dim pin pull up current i dim v dim =0v 10 a pwm dimming on propagation delay t pwmon_pd pwm rising edge to drive rising edge 540 750 ns pwm dimming off propagation delay t pwmoff_pd pwm falling edge to drive falling edge 3 4 s bos source current i bos vbos = 0v 3 4 5 a bos high threshold v bosh bos pin connected to gnd with a cap 2.1 2.4 2.6 v -40c t a +85c 270 300 330 cs pin reference voltage v ref t a =+25c 285 300 315 mv cs input bias current i cs -1 1 a turn-off propagation delay t off_pd 100 (5) ns leading edge blanking time t leb 200 320 450 ns turn-on propagation delay t on_pd 100 (5) ns gate drive source current i drv_source v drv =0v 400 (5) ma gate drive sink current i drv_sink v drv =vcc -1.2 (5) a drive low level output voltage v drvl i drv =10ma 50 mv drive high level output voltage to rail v drvh i drv =-10ma 110 mv gate minimal turn-on time t on_min 400 (5) ns maximum switching frequency f sw_max 110 (5) khz over temperature protection threshold t otp 150 c over temperature protection threshold hysteresis t otp_hys 30 c output short shut down time t shut-down 1.7 ms notes: 5) guarantee by design.
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 4 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. pin functions pin # name description 1 drive external mosfet drive output. 2 cs led current sense input. connect the current sense resistor that programs the led current . 3 bos burst oscillator setting. for the dc input burst di mming, connect a capacitor from this pin to gnd to program the burst dimming frequency. for the external pwm input burst dimming, connect a 300k resistor from this pin to gnd and apply the logic signal to the dim pin. 4 gnd ground. 5 dim burst dimming control input. for dc input control, the volt age range of 0v to 2.4v at dim pin linearly sets the burst-mode duty cycle from minimum to 100%. for external pwm input control, connect the pwm signal to dim pin. open dim pin if no dimming control is applied. 6 nc no connection. float this pin. 7 vcc the vcc voltage provides the power for ic logic and driving external mosfet. must be locally bypassed. 8 tst test pin. connect to gnd.
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 5 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics v cc =10v, v in =90v ac to 265v ac , v out =10v to 40v, l=680 h , t a = +25 c, unless otherwise noted. 60 70 80 90 100 80 110 140 170 200 230 260 12led efficiency vs. string voltage efficiency (%) efficiency (%) efficiency vs. input voltage input voltage (vac) 3led 60 65 70 75 80 85 90 0 1020304050 led string voltage (v) 110vac 230vac i out =0.35a i out =0.35a efficiency vs. input line voltage 50 60 70 80 90 100 90 120 150 180 210 240 270 efficiency (%) i led =0.7a input line voltage (v) i led regulation vs. input voltage i led regulation (%) input voltage (vac) -9 -6 -3 0 3 6 9 90 120 150 180 210 240 270 6led 3led i out =0.35a i led regulation vs. ambient temp i led regulation vs. string voltage i led regulation (%) i led regulation (%) led string voltage (v) -9 -6 -3 0 3 6 9 0 10 20304050 110vac 230vac -9 -6 -3 0 3 6 9 -30 -10 10 30 50 70 90 110 ambient temperature (?c) 120vac 220vac passive pfc i out =350ma led string voltage (v) 0. 5 0. 6 0. 7 0. 8 0. 9 1. 0 0 1020304050 pfc 220vac 120vac led current vs. pwm dimming duty (fpwm=100hz) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 20 40 60 80 100 120 dim duty ( % ) iled ( a ) en 55022 voltage on mains qp en 55022 voltage on mains av emi v in =120v ac v out =27v 0 10 20 30 40 50 60 70 0. 15 11030 frequency (mhz)
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 6 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics (continued) v cc =10v, v in =90v ac to 265v ac , v out =10v to 40v, l=680 h , t a = +25 c, unless otherwise noted. v bus 20v/div. i l 200ma/div. sw 20v/div. drive 200mv/div. cs 1v/div. i led 500ma/div. v g 5v/div. v g 5v/div. sw 100v/div. i led 500ma/div. led- 100v/div. sw 100v/div. sw 100v/div. i l 1a/div. dim 5v/div. gate 5v/div. sw 50v/div. i l 500ma/div. bos 1v/div. dim 1v/div. steady state operation pwm dimming analog dimming led short protection led open protection power ramp up v in =120v ac v out =33v power ramp down v in =120v ac v out =33v v dcin 100v/div. v out 25v/div. v gs 10v/div. i l 0.5a/div. v dcin 100v/div. v out 25v/div. v gs 10v/div. i l 0.5a/div. analog dimming iled ( a ) analog dim ( v ) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 30 emi v in =220v ac v out =27v frequency (mhz) en 55022 voltage on mains qp en 55022 voltage on mains av
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 7 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. functional block diagram cin drive rs ac c1 vcc cs gnd filter and leb=110ns thermal protection thermal protection bos 50k zero-i detection circuit dim 1.7ms max off time control 110khz max frequency control driver driver uvlo vref output short protection output short protection control and protection circuit v supply burst oscillator burst oscillator figure 1?function block diagram
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 8 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. operation led current regulation and zero-current detection with a floating buck converter configuration, as shown in the typical application circuit, the mp4000 turns off the mosfet s1 with a peak current control. the peak current is sensed with a resistor r sense and feeds back to cs pin. the peak current is regulated as: ref l _ peak sense v i r = . in normal operation, mp4000 turns on s1 when the current in the freewheeling diode goes to zero. as a result, the average led current is well regulated as ref led sense v i 2r = ? . the zero-current detection is realized at drive pin by sensing the mosfet drain dv/dt current through the s1?s miller cap. when the freewheeling diode current goes to zero, s1 drain voltage (v sw ) drops from v supply to (v supply -v out ) and starts oscillation, which is caused by the inductor and the parasitic caps. when v sw reaches the minimum value, the dv/dt current through the miller cap changes from negative to zero. at this time, the mp4000 turns on s1. as a result, the mp4000 turns on s1 when the inductor current goes to zero and s1 drain voltage is at minimum. mp4000 controls the buck converter operating in current boundary conduction mode. a cap cout can be used in parallel with the led string to reduce the current ripple. such boundary operation mode can minimize the s1 turn-on loss and eliminate the freewheeling diode reverse recovery loss so that high switching frequency is possible to reduce passive components? size. furthermore, the required inductance value is small, which can help further inductor size reduction. brightness dimming control the mp4000 employs a burst dimming control scheme so that an external pwm signal can control the dimming by varying the duty cycle, or a dc signal can control the dimming by varying the dc voltage level. for the pwm input dimming control, a 100hz to 2khz pwm signal is recommended to connect to the dim pin. bos pin is connected to gnd through a 300k resistor, setting about 1.2v reference for the pwm input logic signal. pwm input high will make the ic switching. pwm input low turns off the ic. for the dc input dimming control, a voltage from 0v to 2.4v is recommended to connect to the dim pin. 2.4v and above is for the 100% brightness. 120mv and below is for the 5% minimal brightness. a cap c bos is connected from bos pin to gbd to program the burst frequency f dim . bos bos bosh dim i c vf = ? . for applications that do not need burst dimming control, open dim pin and short bos pin to gnd. for some case that needs high dimming resolution, where the dimming off time would be smaller than the switching period, dimming on signal will force the mosfet to turn on even when the inductor current is not zero. if this condition would happen in the application, ultra fast recovery diode is recommended for the freewheeling diode. frequency setting and inductor design in case the zero-current detection circuit fails, which can happen in starting up with a large output cap and in output short condition, a maximum off time of about 1.7ms is applied to make sure the device is still in operation and the short current doesn?t run away.
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 9 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. a maximum 110khz switching frequency is set by the mp4000 to avoid extreme losses in the circuit and ensure better emi performance. if the converter reaches the maximum frequency, it will operate in discontinuous current conduction mode. such operation mode should be avoided since the led current is out of regulation. in order to design the switching frequency f s within the 30khz to 110khz range, inductor design is critical. supply out out s led supply (v v ) v 1 l f2i v ?? =? ?? , where, v supply is the input voltage of the buck converter, v out is the led voltage. hiccup output short protection if the entire led string is shorted, vout is zero. due to the minimum on-time limit, the inductor current will be out of regulation. the mp4000 can detect such failure and shut down for about 1.7ms, and then re-tries the operation. such hiccup protection can not only eliminate the thermal issue due to short circuit current, but also maintain normal operation if the protection is mis-triggered. under-voltage lockout (uvlo) protection under-voltage lockout (uvlo) is implemented to protect the chip from operating at insufficient supply voltage. the uvlo rising threshold is about 7.4v while its falling threshold is a consistent 6.4v. thermal shut down protection an accurate temperature protection is implemented to prevent the chip from operating at exceedingly high temperatures. when the silicon die temperature is higher than its upper threshold, it shuts down the whole chip. when the temperature is lower than its lower threshold, the chip is enabled again. valley-fill pfc if power factor >0.7 is required for the application. valley-fill circuit is a simple choice to improve the power factor. the valley-fill circuit is shown in the figure 2. when the input voltage is higher than the half of the peak voltage, power is delivered directly through the diode bridge. meanwhile c4 and c3 is charged in series through d2 as shown in the equivalent circuit (fig3). the peak voltage of the valley-fill capacitor is: vf cap ac rms v0.5v2 ?? = c4 c3 led_p ac input vdc figure?2 valley-fill circuit. led_p figure?3 equivalent circuit: valley-fill charging period as the ac line decreases from its peak value every cycle, there will be a point where the voltage magnitude of the ac line is equal to the voltage that each capacitor is charged. at this point diode d5 becomes reversed biased, and the capacitors c4 and c3 are in parallel and are discharging by the load. the equivalent circuit is shown in figure 4.
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 10 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. led_p figure?4 valley fill circuit when ac line is low through the valley-fill operation, the circuit extends the conduction angle thus improves the power factor. the resistor r1 is a current limit resistor. figure 5 shows the result of the valley- fill pfc. figure?5 valley fill waveform
mp4000 ? offline high brightness wled driver controller mp4000 rev. 1.3 www.monolithicpower.com 11 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. reference design description residential downlighting is transiting to more efficient sources of light. led light will become the trend in the near future. this reference design is a 3~12w led driver specifically for residential downlighting and led bulb replacement. it utilizes the mp4000: a high efficiency, accurate current regulation led lighting driver controller. key features -accurate current regulation -high efficiency -compact size -low cost design specification v in : 90vac to 265vac v out : 10v to 40v i out : 350ma pfc: >0.7 emi: meet en55022 and par-22 class b standards l n mb4s 0.1uf/ 275v 0.12uf/400v 1n4148 10v 10uf/16v 12nf/400v 3 2 1 std3nk60zt4 680uh ns figure?6 reference design circuit: universal input, 3~12w led lighting solution
mp4000 ? offline high brightness wled driver controller notice: the information in this document is subject to change wi thout notice. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp4000 rev. 1.3 www.monolithicpower.com 12 11/7/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information soic8 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) 0.189(4.80) 0.197(5.00) 0.053(1.35) 0.069(1.75) top view front view 0.228(5.80) 0.244(6.20) side view 14 85 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 aa. 6) drawing is not to scale. 0.010(0.25) bsc gauge plane

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