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| MP3389 12?string, step-up white led driver MP3389 rev. 1.04 www.monolithicpower.com 1 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP3389 is a step-up controller with 12- channel current sources designed for driving the wled arrays for large size lcd panel backlighting applications. the MP3389 uses current mode, fixed frequency architecture. the switching frequency is programmable by an external frequency setting resistor. it drives an external mosfet to boost up the output voltage from a 5v to 28v input supply. the MP3389 regulates the current in each led string to the programmed value set by an external current setting resistor. the MP3389 applies 12 internal current sources for current balance. and the current matching can achieve 2.5% regulation accuracy between strings. its low 550mv regulation voltage on led current sources reduces power loss and improves efficiency. pwm dimming is implemented with external pwm input signal or dc input signal. the dimming pwm signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor. features ? high efficiency and small size ? 5v to 28v input voltage range ? balanced driver for 12 strings of wleds ? maximum 60ma for each string ? 2.5% current matching accuracy between strings ? programmable switching frequency ? pwm or dc input burst pwm dimming ? open and short led protection ? programmable over-voltage protection ? under voltage lockout ? thermal shutdown ? 28-pin tssop and 28-pin soic package applications ? desktop lcd flat panel displays ? flat panel video displays ? lcd tvs and monitors 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. typical application vin 5v~28v MP3389 isense gate en osc nc bosc gn d dbrt nc ovp led1 led2 led3 8 1 10 7 6 9 26 24 28 23 22 21 enable dimming l1 d1 c in r1 r2 r set c bosc r osc r sense m2 led4 led5 led6 r comp 20 19 18 17 vin vcc comp 2 3 4 5 iset c out c com p c vcc r bosc vcc led12 led11 led10 11 12 13 14 led9 vf au lt 27 pgnd 25 led7 led8 16 15 m1 free datasheet http:///
MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 2 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* package top marking MP3389ef tssop28 3389ef MP3389ey soic28 3389ey * for tape & reel, add suffix ?z (eg. MP3389ef?z). for rohs compliant packaging, add suffix ?lf (eg. MP3389ef?lf?z) ** for tape & reel, add suffix ?z (eg. MP3389ey?z). for rohs compliant packaging, add suffix ?lf (eg. MP3389ey?lf?z) package reference nc vin vcc comp en dbrt gnd osc iset bosc led12 led11 led10 led9 nc vfault gate pgnd isense ovp led1 led2 led3 led4 led5 led6 led7 led8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 top view tssop28 soic28 absolute maxi mum ratings (1) v in .................................................-0.3v to +30v v vfault ........................................... v in - 6v to v in v gate ..............................................-0.5v to 6.3v v led1 to v led12 ..................................-1v to +50v all other pins ...............................-0.3v to +6.3v continuous power dissipation (t a = +25c) (2) tssop28???????????? ...3.9w soic28????????????? ...2.1w junction temperature ...............................150 c lead temperature ....................................260 c storage temperature............... -65 c to +150 c recommended operating conditions (3) supply voltage v in ..............................5v to 28v led current (backlight) .............10ma to 60ma operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc tssop28 ................................32 ....... 6 .... c/w soic28 ..................................60 ...... 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 operation conditions. 4) measured on jesd51-7, 4-layer pcb. MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 3 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics v in =12v, v en = 5v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units operating input voltage v in 4.5 28 v supply current (quiescent) i q v in =12v, v en =5v, no load with switching 4 ma supply current (shutdown) i st v en =0v, v in =12v 2 a ldo output voltage v cc v en =5v, 6v MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 5 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name description 1 nc no connect. 2 vin supply input. vin supplies the power to the chip, as well as the step-up converter switch. drive vin with a 5v to 28v power source. must be locally bypassed. 3 vcc the internal 5v linear regulator output. vcc pr ovides power supply for the internal mosfet switch gate driver and the internal control circuitry. bypass vcc to gnd with a ceramic capacitor. 4 comp step-up converter compensation pin. this pin is used to compensate the regulation control loop. connect a capacitor or a series rc network from comp to gnd. 5 en enable control input. do not let this pin floating. 6 dbrt brightness control input. to use external pw m dimming mode, apply a pwm signal on this pin for brightness control. to use dc input pwm dimming mode, apply a dc voltage range from 0.2v to 1.2v on this pin linearly to set the internal dimming duty cycle from 0% to 100%. the MP3389 has positive dimming polarity on dbrt. 7 gnd analog ground. 8 osc switching frequency set. connect a resistor between osc and gnd to set the step-up converter switching frequency. the voltage at this pin is regulated to 1.23v. the clock frequency is proportional to the current sourced from this pin. 9 iset led current set. tie a current setting resistor from this pin to ground to program the current in each led string. the MP3389 regulates the voltag e across the current setting resistor. the regulation voltage is 1.22v. the proportion of the current through the iset resistor and the led current is 1:1000. 10 bosc dimming repetition set. this is the timing pin fo r the oscillator to set the dimming frequency. to use dc input pwm dimming mode, connect a capacitor from this pin to gnd to set the internal dimming frequency. a saw-tooth waveform is gene rated on this pin. to use external pwm dimming mode, connect a 100k ? resistor from this pin to gnd, and apply the pwm signal on dbrt pin. 11 led12 led string 12 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 12 cathode to this pin. if this string is not used, connect vin to this pin. 12 led11 led string 11 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 11 cathode to this pin. if this string is not used, connect vin to this pin. 13 led10 led string 10 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 10 cathode to this pi n. if this string is not used, connect vin to this pin. 14 led9 led string 9 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 9 cathode to this pin. if this string is not us ed, connect vin to this pin. MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 6 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions (continued) pin # name description 15 led8 led string 8 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 8 catho de to this pin. if this string is not used, connect vin to this pin. 16 led7 led string 7 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 7 catho de to this pin. if this string is not used, connect vin to this pin. 17 led6 led string 6 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 6 catho de to this pin. if this string is not used, connect vin to this pin. 18 led5 led string 5 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 5 catho de to this pin. if this string is not used, connect vin to this pin. 19 led4 led string 4 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 4 catho de to this pin. if this string is not used, connect vin to this pin. 20 led3 led string 3 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 3 catho de to this pin. if this string is not used, connect vin to this pin. 21 led2 led string 2 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 2 catho de to this pin. if this string is not used, connect vin to this pin. 22 led1 led string 1 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 1 catho de to this pin. if this string is not used, connect vin to this pin. 23 ovp over-voltage protection input. connect a resi stor divider from output to this pin to program the ovp threshold. when this pi n voltage reaches 1.23v, the MP3389 triggers ov protection mode. 24 isense current sense input. during normal operation, this pin senses the voltage across the external inductor current sensing resistor fo r peak current mode control and also to limit the inductor current duri ng every switching cycle. 25 pgnd step-up converter power ground. 26 gate step-up converter power switch gate output. this pin drives the external power n-mos device. 27 vfault fault disconnection switch gate output. w hen the system starts up normally, this pin smoothly turns on the external pmos. when the MP3389 is disabled, the external pmos is turned off to disconnect the input and output. 28 nc no connect. MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 7 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v in =12v, 14 leds in series, 12 strings parallel, 20ma/string, unless otherwise noted. v sw 20v/div. v sw 20v/div. v in 5v/div. v led1 1v/div. v out (ac) 1v/div. v out 20v/div. i led1 20ma/div. i led 200ma/div. v sw 20v/div. v sw 20v/div. v en 5v/div. v out 20v/div. v bosc 500mv/div. v out 20v/div. i led 200ma/div. i led 200ma/div. v sw 20v/div. v out 20v/div. v pwm1 5v/div. i led 200ma/div. steady state vin startup ven startup v sw 20v/div. v sw 20v/div. v out 20v/div. v out 20v/div. v fault 5v/div. v led1 20v/div. i led 200ma/div. v sw 20v/div. v out 50v/div. v fault 5v/div. i led 200ma/div. i led 100ma/div. open led protection open all led strings at working short led protection short v out to ledx at working short led protection short v out to gnd at working efficiency vs. input voltage 0.7 0.75 0.8 0.85 0.9 0.95 612182430 input voltage (v) efficiency MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 8 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. function diagram control logic + - current sense amplifier + - pwm comparator oscillator + - 1.23v ov comparator + - + - led1 + - dpwm oscillator dpwm comparator + - 1.22v max min feedback control 5.5v ea led ov comparator short string protection regulator led12 ovp isense gnd vin vcc dbrt bosc iset comp osc en enable control 600 mv gate pgnd vfault current control figure 1?MP3389 function block diagram MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 9 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the MP3389 employs a programmable constant frequency, peak current mode step-up converter and 12-channels regulated current sources to regulate the array of 12 strings white leds. the operation of the MP3389 can be understood by referring to the block diagram of figure 1. internal 5v regulator the MP3389 includes an internal linear regulator (vcc). when vin is greater than 5.5v, this regulator offers a 5v power supply for the internal mosfet switch gate driver and the internal control circuitry. the vcc voltage drops to 0v when the chip shuts down. in the application of vin smaller than 5.5v, tie vcc and vin together. the MP3389 features under voltage lockout. the chip is disabled until vcc exceeds the uvlo threshold. and the hysteresis of uvlo is approximately 200mv. system startup when the MP3389 is enabled, the chip checks the topology connection first. the vfault pin drives the external fault disconnection pmos to turn on slowly. then the chip monitors the ovp pin to see if the schottky diode is not connected or the boost output is short to gnd. if the ovp voltage is lower than 70mv, the chip will be disabled and the external pmos is turned off together. the MP3389 will also check other safety limits, including uvlo and otp after the ovp test is passed. if they are all in function, it then starts boosting the step-up converter with an internal soft-start. it is recommended on the start up sequence that the enable signal comes after input voltage and pwm dimming signal established. step-up converter the converter operation frequency is programmable (from 100khz to 500khz) with a external set resistor on osc pin, which is helpful for optimizing the external components sizes and improving the efficiency. at the beginning of each cycle, the external mosfet is turned with the internal clock. to prevent sub-harmonic oscillations at duty cycles greater than 50 percent, a stabilizing ramp is added to the output of the current sense amplifier and the result is fed into the pwm comparator. when this result voltage reaches the output voltage of the error amplifier (v comp ) the external mosfet is turned off. the voltage at the output of the internal error amplifier is an amplified signal of the difference between the 550mv reference voltage and the feedback voltage. the converter automatically chooses the lowest active ledx pin voltage for providing enough bus voltage to power all the led arrays. if the feedback voltage drops below the 550mv reference, the output of the error amplifier increases. it results in more current flowing through the power fet, thus increasing the power delivered to the output. in this way it forms a close loop to make the output voltage in regulation. at light-load or vout near to vin operation, the converter runs into the pulse-skipping mode, the fet is turned on for a minimum on-time of approximately 100ns, and then the converter discharges the power to the output in the remain period. the external mosfet will keep off until the output voltage needs to be boosted again. dimming control the MP3389 provides two pwm dimming methods: external pwm signal or dc input pwm dimming mode (see figure 2). both methods results in pwm chopping of the current in the leds for all 12 channels to provide led control. + - dpwm oscillator dpwm comparator dbrt bosc ex-pwm input c bosc dpwm output figure 2?pwm dimming method when bias the bosc pin to a dc level, applying a pwm signal to the dbrt pin to achieve the pwm dimming. a dc analog signal can be MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 10 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. directly applied to the dbrt pin to modulate the led current. and the dc signal is then converted to a dpwm dimming signal at the setting oscillation frequency. the brightness of the led array is proportional to the duty cycle of the dpwm signal. the dpwm signal frequency is set by the cap at the bosc pin. open string protection the open string protection is achieved through the over voltage protection. if one or more strings are open, the respective ledx pins are pulled to ground and the ic keeps charging the output voltage until it reach ovp threshold. then the part will mark off the open strings whose ledx pin voltage is less than 180mv. once the mark- off operation completes, the remaining led strings will force the output voltage back into tight regulation. the string with the highest voltage drop is the ruling string during output regulation. the MP3389 always tries to light at least one string and if all strings in use are open, the MP3389 shuts down the step-up converter. the part will maintain mark-off information until the part shuts down. short string protection the MP3389 monitors the ledx pin voltage to judge if the short string occurs. if one or more strings are short, the respective ledx pins will be pulled up to the boost output and tolerate high voltage stress. if the ledx pin voltage is higher than 5.5v, the short string condition is detected on the respective string. when the short string fault (ledx over-voltage fault) continues for greater than 512 switching clocks, the string is marked off and disabled. once a string is marked off, its current regulation is forced to disconnect from the output voltage loop regulation. the marked-off led strings will be shut off totally until the part restarts. if all strings in use are short, the MP3389 will shut down the step-up converter. MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 11 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information selecting the switching frequency the switching frequency of the step-up converter is programmable from 100khz to 500khz. a oscillator resistor on osc pin sets the internal oscillator frequency for the step-up converter according to the equation: f sw = 67850 / r osc k ? for r osc =191k ? , the switching frequency is set to 355 khz. setting the led current the led string currents are identical and set through the current setting resistor on the iset pin. i led = 1000 x 1.22v / r set for r set =60.4k ? , the led current is set to 20ma. the iset pin can not be open. selecting the input capacitor the input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. the input capacitor impedance at the switching frequency should be less than the input source impedance to prevent high frequency switching current from passing through the input. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 4.7 f ceramic capacitor paralleled a 220uf electrolytic capacitor is sufficient. selecting the inductor and current sensing resistor the inductor is required to force the higher output voltage while being driven by the input voltage. a larger value inductor results in less ripple current, resulting in lower peak inductor current and reducing stress on the internal n-channel mosfet. however, the larger value inductor has a larger physical size, higher series resistance, and lower saturation current. choose an inductor that does not saturate under the worst-case load conditions. a good rule for determining the inductance is to allow the peak- to-peak ripple current to be approximately 30% to 40% of the maximum input current. calculate the required inductance value by the equation: in out in out sw v(v v) l vf i ? = out load(max) in(max) in vi i v = in(max) i(30%~40%)i = where v in is the minimum input voltage, f sw is the switching frequency, i load(max) is the maximum load current, ? i is the peak-to-peak inductor ripple current and is the efficiency. the switch current is usually used for the peak current mode control. in order to avoid hitting the current limit, the voltage across the sensing resistor r sense should be less than 80% of the worst case current limit voltage, v sense. sense sense l(peak) 0.8 v r i = where i l(peak) is the peak value of the inductor current. v sense is shown in figure 3. v sense vs. duty cycle duty cycle (%) 0 100 200 300 400 500 600 700 0 102030405060708090100 figure 3?v sense vs duty cycle selecting the power mosfet the MP3389 is capable of driving a wide variety of n-channel power mosfets. the critical parameters of selection of a mosfet are: 1. maximum drain to source voltage, v ds(max) 2. maximum current, i d(max) 3. on-resistance, r ds(on) 4. gate source charge q gs and gate drain charge q gd 5. total gate charge, q g MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 12 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ideally, the off-state voltage across the mosfet is equal to the output voltage. considering the voltage spike when it turns off, v ds(max) should be greater than 1.5 times of the output voltage. the maximum current through the power mosfet happens when the input voltage is minimum and the output power is maximum. the maximum rms current through the mosfet is given by max in(max) ) max ( rms d i i = where: out ) min ( in out max v v v d ? the current rating of the mosfet should be greater than 1.5 times i rms, the on resistance of the mosfet determines the conduction loss, which is given by: k r i p (on) ds 2 rms cond = where k is the temperature coefficient of the mosfet. the switching loss is related to q gd and q gs1 which determine the commutation time. q gs1 is the charge between the threshold voltage and the plateau voltage when a driver charges the gate, which can be read in the chart of v gs vs. q g of the mosfet datasheet. q gd is the charge during the plateau voltage. these two parameters are needed to estimate the turn on and turn off loss. sw in ds plt dr g gd sw in ds th dr g gs1 sw f i v v v r q f i v v v r q p ? + ? = where v th is the threshold voltage, v plt is the plateau voltage, r g is the gate resistance, v ds is the drain-source voltage. please note that the switching loss is the most difficult part in the loss estimation. the formula above provides a simple physical expression. if more accurate estimation is required, the expressions will be much more complex. for extended knowledge of the power loss estimation, readers should refer to the book ?power mosfet theory and applications? written by duncan a. grant and john gowar. the total gate charge, q g , is used to calculate the gate drive loss. the expression is sw dr g dr f v q p = where v dr is the drive voltage. selecting the output capacitor the output capacitor keeps the output voltage ripple small and ensures feedback loop stability. the output capacitor impedance should be low at the switching frequency. ceramic capacitors with x7r dielectrics are recommended for their low esr characteristics. for most applications, a 4.7 f ceramic capacitor paralleled 10uf electrolytic capacitor will be sufficient. setting the over voltage protection the open string protection is achieved through the over voltage protection (ovp). in some cases, an led string failure results in the feedback voltage always zero. the part then keeps boosting the output voltage higher and higher. if the output voltage reaches the programmed ovp threshold, the protection will be triggered. to make sure the chip functions properly, the ovp setting resistor divider must be set with a proper value. the recommended ovp point is about 1.2 times higher than the output voltage for normal operation. v ovp =1.23v*(r 1 +r 2 )/r 2 selecting dimming control mode the MP3389 provides 2 different dimming methods 1. direct pwm dimming an external pwm dimming signal is employed to achieve pwm dimming control. connect a 100k ? resistor from bosc pin to gnd and apply the 100hz to 2khz pwm dimming signal to dbrt pin. the minimum recommended amplitude of the pwm signal is 1.2v. the low level should less than 0.4v. (see figure 4). MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 13 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. bosc dbrt MP3389 pwm dimming 100hz~2khz r1 100 k figure 4?direct pwm dimming table 1 shows the pwm dimming duty range with different pwm dimming frequency. tab 1 the range of pwm dimming duty fpwm(hz) dmin dmax 100 MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 14 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application circuit nc c2 dimming en gnd 100k r8 c18 60.4k r16 0 r11 nc c10 5.6nf c17 l1 0.05 r24 0 r36 0 r37 0 r33 0 r34 0 r30 0 r31 0 r27 0 r28 nc r25 nc c12 b180 d1 10k r53 led11 led8 led10 led7 led9 led5 led2 led4 led1 led3 led+ c1 c3 191k r13 0 r15 0 r38 0 r29 0 r32 0 r35 nc r26 c13 led12 led6 vin 20k r5 20k r4 8v-28v f1 nc c6 0 r22 10k r54 c9 10 r20 100pf c14 14s 12p 20ma 2k r2 2k r1 am4499p m1 100nf c4 c16 c15 m2 am4490n 432k r51 led11 12 dbrt 6 nc 1 comp 4 led6 17 led3 20 ovp 23 isense 24 led10 13 led9 14 led12 11 iset 9 bosc 10 gnd 7 en 5 osc 8 vin 2 vcc 3 led8 15 led7 16 led5 18 led4 19 led2 21 led1 22 pgnd 25 nc 28 vfault 27 gate 26 MP3389 u1 net00016 gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd figure 7?drive 14 leds in series, 12 strings 20ma/string for monitor backlighting nc c2 dimming en gnd 100k r8 c18 60.4k r16 0 r11 nc c10 5.6nf c17 l1 0.05 r24 0 r36 0 r37 0 r33 0 r34 0 r30 0 r31 0 r27 0 r28 nc r25 nc c12 b180 d1 10k r53 led2 led4 led1 led3 led+ c1 c3 191k r13 0 r15 0 r38 0 r29 0 r32 0 r35 nc r26 c13 vin 20k r5 20k r4 8v-28v f1 nc c6 0 r22 10k r54 c9 10 r20 100pf c14 18s 4p 60ma 2k r2 2k r1 am4499p m1 100nf c4 c16 c15 m2 am4490n 432k r51 led11 12 dbrt 6 nc 1 comp 4 led6 17 led3 20 ovp 23 isense 24 led10 13 led9 14 led12 11 iset 9 bosc 10 gnd 7 en 5 osc 8 vin 2 vcc 3 led8 15 led7 16 led5 18 led4 19 led2 21 led1 22 pgnd 25 nc 28 vfault 27 gate 26 MP3389 u1 net00016 gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd 3 1, 2,5 , 6 4 m3 3 1 ,2, 5,6 4 m4 3 1 , 2 , 5, 6 4 m5 3 1 , 2,5, 6 4 m6 m3-m6: am3490n 100v/1a tsop6 0 r39 nc r40 vin gnd figure 8 ? drive 18leds in series, 4 strings 60ma/string note: for vin>15v application, use r139 and r40(10k ? ) divider to make a 15v bias voltage for m3-m6. MP3389?12-string white led driver with step-up controller MP3389 rev. 1.04 www.monolithicpower.com 15 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information tssop28 side view note: 1) all dimensions are in millimeters . 2) package length does not include mold flash , protrusion or gate burr . 3) package width does not include interlead flash or protrusion. 4) lead coplanarity (bottom of leads after forming ) shall be 0.10 millimeters max. 5) drawing conforms to jedec mo-153, variation aet. 6) drawing is not to scale. detail A 0.45 0.75 0 o -8 o 0.25 bsc gauge plane 9.60 9.80 pin 1 id 4. 3 0 4. 5 0 6.20 6.60 114 15 28 top view 0.09 0.20 see detail " a" bottom view 2.60 3.10 5.70 6.10 0.19 0.30 seating plane 0.65 bsc 0.80 1.05 1.20 max 0.00 0.15 front view recommended land pattern 5.80 typ 1.60 typ 0.40 typ 0.65 bsc 3.20 typ 5.90 typ MP3389?12-string white led driver with step-up controller notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP3389 rev. 1.04 www.monolithicpower.com 16 3/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information soic28 |
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