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| MP3391 8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 1 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP3391 is a step-up controller with 8- channel current sources designed for driving the wled arrays for large size lcd panel backlighting applications. the MP3391 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 9v to 35v input supply. the MP3391 regulates the current in each led string to the programmed value set by an external current setting resistor. the MP3391 applies 8 internal current sources for current balance. and the current matching can achieve 2.5% regulation accuracy between strings. its low 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 ? 9v to 35v input voltage range ? 10v mosfet gate driver ? drive selectable 8, 6 and 4 strings of leds ? maximum 120ma for each string ? 2.5% current matching accuracy between strings ? programmable switching frequency ? pwm or dc input burst pwm dimming ? open/short protection and fault flag output ? programmable short protection voltage and time threshold ? programmable over-voltage protection ? flexible extendable led channels application ? 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.
MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 2 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application vin 9v~35v MP3391 isense gate en osc bosc gnd dbrt vdd ovp led1 led2 led3 7 2 9 8 6 11 25 24 1 22 13 14 enable dimming l1 d1 c in r1 r2 r set r osc r sense m1 led4 led5 led6 r comp 15 16 17 18 ff vcc comp 26 3 4 5 iset c out c comp c vcc tset nc sset 10 28 12 21 numsel vfault 27 pgnd 23 led7 led8 19 20 vcc string 1 string 8 ff r ff c bosc c t c dd vcc r sel r3 r4 vin m2 MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 3 3/14/2013 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 ) MP3391ef * tssop28 MP3391ef -20 c to +85 c MP3391ey ** soic28 MP3391ey -20 c to +85 c * for tape & reel, add suffix ?z (eg. MP3391ef?z). for rohs compliant packaging, add suffix ?lf (eg. MP3391ef?lf?z) ** for tape & reel, add suffix ?z (eg. MP3391ey?z). for rohs compliant packaging, add suffix ?lf (eg. MP3391ey?lf?z) package reference tssop28 soic28 absolute maxi mum ratings (1) v in .................................................-0.3v to +40v v fault ..............................................v in -6v to v in v gate ...............................................-0.5v to 12v v led1 to v led8 ....................................-1v to +55v all other pins ...............................-0.3v to +6.3v continuous power dissipation (t a = +25c) (2) tssop28???????????? ...3.9 w 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 ..............................9v to 35v led current (backlight) ...........10ma to 120ma maximum junction temp. (t j ) ................+125 c 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. MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 4 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics v in =18v, v en = 5v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units operating input voltage v in 9 35 v supply current (quiescent) i q v in =18v, v en =5v, no load no switching, r iset =20k ? 3.5 ma supply current (shutdown) i st v en =0v, v in =18v 2 a vcc output voltage v cc v en =5v, 6v MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 6 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name description 1 vdd the internal 10v linear regulator output. vdd provides power supply for the internal mosfet switch gate driver circuitry. bypas s vdd to gnd with a ceramic capacitor. 2 vin supply input. vin supplies the power to the chip , drive vin with 9v to 35v power source. must be locally bypassed with a ceramic capacitor.. 3 vcc option nc. the internal 5v linear regulator output. vcc provides power supply for 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 se ries rc network from comp to gnd. 5 en enable control input. do not let this pin floating. 6 dbrt brightness control input. to use exter nal pwm 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 MP3391 has positive dimming polarity on dbrt. 7 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. 8 gnd analog ground. 9 bosc dimming repetition set. this is the timing pin for 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 generated on this pin. to use external pwm dimming mode, conne ct a resistor from this pin to gnd, and apply the pwm signal on dbrt pin. 10 tset short led protection timer set. connect a ceramic capacitor on this pin to set the protection timer. the protection is triggered when internal 50ua current source charges the capacitor voltage to 1.24v. tset(ms)=0.0248 c(nf), tset is about 11.7ms for 470nf capacitor. 11 iset led current set. tie a current setting resistor from this pin to ground to program the current in each led string. this pin voltage is regulated to 1.23v. the led current is proportional to the current through the iset resistor. 12 sset short led protection voltage threshold set. connect this pin to vcc through external divide resistors to set the short led protecti on threshold. when ledx pin voltage reaches 4.5 times of sset pin voltage, the tset pin c apacitor is charged up for a protection timer. vshort= 4.5 vsset. 13 led1 led string 1 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 1 cathode to this pin. 14 led2 led string 2 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 2 cathode to this pin. 15 led3 led string 3 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 3 cathode to this pin. MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 7 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions (continued) pin # name description 16 led4 led string 4 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 4 cathode to this pin. 17 led5 led string 5 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 5 cathode to this pin. 18 led6 led string 6 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 6 cathode to this pin. 19 led7 led string 7 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 7 cathode to this pin. 20 led8 led string 8 current input. this pin is the open-drain output of an internal dimming control switch. connect the led string 8 cathode to this pin. 21 numsel number of led string selection. set this pin high enables the 6 strings (led1~led6) operation. pull this pin low enables the 4 stri ngs (led1~led4) operation. float this pin enables the 8 strings operation. 22 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 1.24v, the MP3391 triggers over voltage protection mode. 23 pgnd step-up converter power ground. 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 gate step-up converter power switch gate output. this pin drives the external power n-mos device. 26 ff fault flag. it is the drain of internal n-channel mosfet. when open/short protection is triggered, the ff pin is pulled to gnd. 27 vfault fault disconnection switch driver output. w hen the system starts up normally, this pin turns on the external pmos. when the vout is shorted to gnd or MP3391 is disabled, the external pmos is turned off to disconnect the input and output. 28 nc no connection MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 8 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v in =15v, 14 leds in series, 8 strings parallel, 60ma/string, unless otherwise noted. v sw 20v/div. v out 20v/div. i led 200ma/div. v sw 20v/div. v out 20v/div. i led 500ma/div. steady state v in 10v/div. vin startup ven startup external pwm dimming f pwm = 200hz, d pwm = 50% dc burst dimming c bosc = 2.2nf, v pwmi = 0.7v 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 0.83 0.85 0.87 0.89 0.91 0.93 0.95 0.97 5101520253035 efficiency v in (v) efficiency vs. input voltage v sw 20v/div. v out 20v/div. i led 500ma/div. v en 5v/div. v sw 20v/div. v out 20v/div. i led 500ma/div. v pwm 5v/div. v sw 20v/div. v out 20v/div. i led 500ma/div. bosc 500mv/div. v sw 20v/div. v out 20v/div. i led 500ma/div. ff 5v/div. v sw 20v/div. v led1 20v/div. i led 500ma/div. ff 5v/div. v sw 20v/div. v out 20v/div. v fault 10v/div. i inductor 10a/div. MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 9 3/14/2013 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 + - 1.24v ov comparator + - + - led1 + - 1.23v feedback control ea led ov comparator short string protection& timer regulator led8 ovp isense gnd vin vcc numsel iset comp osc en enable control ref gate pgnd ff current control vdd regulator + - dpwm oscillator dpwm comparator dbrt bosc threshold sset tset vfault figure 1?MP3391 function block diagram MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 10 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the MP3391 employs a programmable constant frequency, peak current mode step-up converter and 8-channels regulated current sources to regulate the array of 8 strings white leds. the number of led string is selected by numsel pin for 8/6/4 led strings. the operation of the MP3391 can be understood by referring to the block diagram of figure 1. internal regulator the MP3391 includes two internal linear regulators (vcc and vdd). vcc regulator offers a 5v power supply for the internal control circuitry. vdd regulator offers a 10v power supply for the external mosfet switch gate driver. the vcc and vdd voltage drops to 0v when the chip shuts down. the MP3391 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 MP3391 is enabled, 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 80mv, the chip will be disabled. the MP3391 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 150khz 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 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 450mv 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 MP3391 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 8 channels to provide led control. 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 directly applied to the dbrt pin to modulate the led current with a capacitor on bosc pin. 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. MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 11 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. open string protection the open string protection is achieved through detecting the voltage of ovp and led1~8 pin. 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 marks off the open strings whose ledx pin voltage is less than 190mv. 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 MP3391 always tries to light at least one string and if all strings in use are open, theMP3391 shuts down the step-up converter. the part maintains mark-off information until resetting it. short string protection the MP3391 monitors the ledx pin voltage to judge if the short string occurs. if one or more strings are short, the respective ledx pins tolerate high voltage stress. if the ledx pin voltage is higher than threshold programmed by sset pin, the short string condition is detected on the respective string. when the short string fault (ledx over-voltage fault) continues for greater than protection timer programmed by tset capacitor, 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 MP3391 shuts down the step-up converter. when the open or short protection is triggered, the ff pin will be pull to gnd. the pull-up resistor r ff and ff pin achieve the fault flag function to indicate the system status. MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 12 3/14/2013 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 150khz to 500khz. an oscillator resistor on osc pin sets the internal oscillator frequency for the step-up converter according to the equation: f sw (khz)= 17000/ (10+r osc ) (k ? ) for r osc =50k ? , the switching frequency is set to 283 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 1.23v / r set for r set =60.4k ? , the led current is set to 20ma. the iset pin can not be open. the number of led strings selection the MP3391 can drive 8 strings, 6 strings or 4 strings of leds. set the numsel high level for driving 6 strings of leds (led1~led6). set the numsel low level for driving 4 strings of leds (led1~led4). float the numsel pin for driving 8 strings of leds. 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 220 f 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 40%) ~ (30% 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. current limit(vsense) vs. duty cycle 0 50 100 150 200 250 300 350 400 450 500 0 102030405060708090100 duty cycle(%) current limit-vsense(mv) figure 3?v sense vs duty cycle selecting the power mosfet the MP3391 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) MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 13 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. 3. on-resistance, r ds(on) 4. gate source charge q gs and gate drain charge q gd 5. total gate charge, q g 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 10 f 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. high ovp low r v1.24(1 ) r =+ selecting dimming control mode the MP3391 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 20khz 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). MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 14 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. 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 MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 15 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application circuit 0 r3 nc r2 10 r17 nc c7 vin gnd ff en 1 dimming c3 2 1 jp1 nc c4 c1 f1 l1 b360 d1 nc c8 c5 c2 c6 357k r1 1k r6 10k r9 100pf c9 0 r4 1 led+ led1 led2 led3 led4 led5 led6 led7 led8 led9 led10 led11 led12 led13 led14 led15 led16 10 r18 10 r20 10 r22 10 r24 10 r25 10 r27 10 r29 10 r39 10 r40 10 r41 10 r42 10 r44 10 r45 10 r46 10 r48 c12 0 r8 nc r5 2k r19 20k r21 nc r31 130k r30 nc r28 332k r26 sset nc c14 15.4k r23 470nf c15 nc c13 100k r16 51.1k r15 2k r13 20k r14 10k r7 vcc ff c10 0 r12 c11 comp vcc nc r32 vin nc r34 ff nc r35 c16 vcc nc r36 comp nc r37 nc c19 100k r38 nc c20 15.4k r43 470nf c21 sset nc r49 nc r47 vcc 0 r33 vfault nc c17 nc c18 ovp1 ovp1 0.05 r10 nc r11 10v-28v 10s 8p 80ma/string set to 6.3v vcc 3 2 1 am4499p m3 nc 28 dbrt 6 osc 7 vcc 3 led6 18 led3 15 ovp 22 isense 24 sset 12 numsel 21 tset 10 iset 11 gnd 8 bosc 9 comp 4 en 5 ff 26 vin 2 led8 20 led7 19 led5 17 led4 16 led2 14 led1 13 vdd 1 pgnd 23 gate 25 vfault 27 MP3391ey u1 nc 28 dbrt 6 osc 7 vcc 3 led6 18 led3 15 ovp 22 isense 24 sset 12 numsel 21 tset 10 iset 11 gnd 8 bosc 9 comp 4 en 5 ff 26 vin 2 led8 20 led7 19 led5 17 led4 16 led2 14 led1 13 vdd 1 pgnd 23 gate 25 vfault 27 MP3391ey u2 nc c22 vfault nc r50 nc c23 m2 m1 figure 7? 2 MP3391 extended solution for 16 strings application MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 16 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. 0 r3 nc r2 10 r17 nc c7 vin gnd ff en dimming c3 jp1 nc c4 c1 f1 l1 (3a) inductor b360 d1 nc c8 c5 c2 c6 316k r1 0 r6 10k r9 100pf c9 0 r4 led+ led1 led2 led3 led4 led5 led6 led7 led8 10 r18 10 r20 10 r22 10 r24 10 r25 10 r27 10 r29 c12 0 r5 m2 nc 2k r19 20k r21 nc r31 130k r30 nc r28 332k r26 sset nc c14 20.5k r23 470nf c15 nc c13 100k r16 51.1k r15 2k r13 20k r14 10k r7 vcc ff c10 0 r12 100nf c11 comp vcc ovp1 0.10 r10 nc r11 m1 10v-28v 12s 8p 60ma/string vcc am4499p m3 nc 28 dbrt 6 osc 7 vcc 3 led6 18 led3 15 ovp 22 isense 24 sset 12 numsel 21 tset 10 iset 11 gnd 8 bosc 9 comp 4 en 5 ff 26 vin 2 led8 20 led7 19 led5 17 led4 16 led2 14 led1 13 vdd 1 pgnd 23 gate 25 vfault 27 MP3391ef u1 figure 8? MP3391 application with disconnection function MP3391?8-channel, 120ma/ch step-up wled driver controller MP3391 rev. 1.11 www.monolithicpower.com 17 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information tssop28 MP3391?8-channel, 120ma/ch step-up wled driver 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. MP3391 rev. 1.11 www.monolithicpower.com 18 3/14/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information soic28 |
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