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MP3393 8-string step-up white led driver with external transistor MP3393 rev. 1.05 www.monolithicpower.com 1 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP3393 is a step-up controller with 8 current channel sources designed to power wled backlights for large lcd panels. the MP3393 uses current-mode fixed-frequency architecture. it drives an external mosfet to boost the output voltage. the switching frequency is programmable by an external setting resistor. the MP3393 integrates a constant-current control circuit to regulate the current in each led string to the value set by an external current feedback resistor. current matching can achieve 1.2% regulation accuracy between strings. its low 202mv regulation voltage reduces power loss and improves efficiency. the MP3393 includes protections including under-voltage lockout, led open/short protection, and thermal shutdown. the fault flag pin indicates the statuses of all fault signals. the MP3393 can be daisy-chained to expand the number of led channels. it is available in tssop28ep and soic28 packages. features ? 9v-to-32v input voltage range ? drives 8 channels of led strings ? internal constant-current control ? maximum channel current over 350ma ? 1.2% current matching accuracy between strings ? programmable switching frequency ? analog dimming and external pwm dimming ? open and short led protection ? programmable over-voltage protection ? fault output flag ? thermal shutdown ? extendable led channels that share one power stage set ? tssop28ep and soic28 packages applications ? 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 o f monolithic power systems, inc.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 2 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application vin MP3393 isense gate osc dim gnd ovp ctl1 fb1 ctl2 5 6 21 20 27 26 25 8 7 10 enable dim l1 c in r osc fb2 ctl3 fb3 r comp 9 12 11 14 vin vcc comp 1 2 3 4 c comp c vcc ctl6 19 18 17 16 vfault 28 24 ctl4 fb4 13 15 ff r ff d1 r1 r2 r sense m1 c out r s1 r s2 r s3 r s4 8 wled strings r s2 r s3 r s4 en 22 ctl5 fb5 fb6 ctl7 fb7 ctl8 fb8 23 ff
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 3 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number package top marking MP3393ef tssop28ep MP3393 MP3393ey soic28 MP3393 * for tape & reel, add suffix ?z (eg. MP3393ef?z). for rohs, compliant packaging, add suffix ?lf (e.g. MP3393ef?lf?z). ** for tape & reel, add suffix ?z (eg. MP3393ey?z). for rohs, compliant packaging, add suffix ?lf (e.g. MP3393ey?lf?z). package reference vin osc ctl2 comp fb2 ctl1 ctl3 26 25 24 23 exposed pad connect to gnd fb8 28 27 9 10 7 8 vcc dim fb1 g a t e i s e n s e g n d v f a u l t f f top view 20 19 22 21 3 4 5 6 1 2 ctl6 fb5 ctl5 fb3 16 15 18 17 13 14 11 12 ctl4 fb4 en o v p fb6 ctl7 fb7 ctl8 tssop28ep soic28 absolute maxi mum ratings (1) v in v fault ........................................-0.3v to 35v v gate ...............................................-0.5v to 13v v cc ..................................................-0.5v to 13v v ctl1 to v ctl8 ................................................ 58v all other pins ...............................-0.3v to +6.3v continuous power dissipation (t a = +25c) (2) tssop28ep????????????...3.9 w soic28???????????????2.1w junction temperature ...............................150c lead temperature ....................................260c storage temperature............... -65c to +150c recommended operating conditions (3) supply voltage v in ..............................9v to 32v led current (backlight) ...........50ma to 300ma operating junction temp (t j ).. -40c to +125c thermal resistance (4) ja jc tssop28ep ...........................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.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 4 3/26/2013 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 = +25c, unless otherwise noted. parameters symbol condition min typ max units operating input voltage v in 9 32 v supply current (quiescent) i q v in =12v, v en =5v, no load with switching 3 ma supply current (shutdown) i st v en =0v, v in =12v 2 a ldo output voltage v cc v en =5v, 11v MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 5 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics (continued) v in =12v, v en = 5v, t a = +25c, unless otherwise noted. parameters symbol condition min typ max units protection ovp over voltage threshold v ovp_ov rising edge 1.20 1.23 1.26 v ovp uvlo threshold v ovp_uv step-up converter fails 50 70 90 mv ctlx uvlo threshold v ctl_uv 180 210 240 mv ctlx over voltage threshold v ctl_ov 6 6.4 6.8 v thermal shutdown threshold t st 150 ff pull down resistance r ff 22 ? vfault pull down current i fault 40 55 70 a vfault blocking-off voltage (with respect to v in ) v fault v in =24v, v in -v fault 5 5.5 6 v
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 6 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name description 1 vin supply input. the power to the chip, as well as the step-up converter switch. drive vin with 9v-to-32v power source . must be locally bypassed. 2 vcc internal 10v linear regulator output. provides power for the internal mosfet switch gate driver and the internal control circui try. bypass vcc to gnd with a ceramic capacitor. 3 comp step-up converter compensator. compensates the regulation control loop. connect a ceramic capacitor from comp to gnd. 4 osc switching frequency set. connect a resistor between osc and gnd to set the step-up converter?s switching frequency. the voltage at this pin is regulated to 1.23v. the clock frequency is proportional to the current sourced from this pin. 5 en enable control input. do not leave this pin floating. use a ceramic capacitor for local filtering. 6 dim dimming. for pwm dimming, apply an external pwm signal with amplitude greater than 1.5v. for analog dimming, apply a dc voltage rang ing from 0.4v to 1.5v to linearly set the led current from 0% to 100%. 7 fb1 led current feedback. detects the channel 1 current. 8 ctl1 external transistor control pin. connect it to the base of an external transistor to regulate the channel 1 current. 9 fb2 led current feedback. detects the channel 2 current. 10 ctl2 external transistor control pin. connect it to the base of an external transistor to regulate the channel 2 current. 11 fb3 led current feedback. detects the channel 3 current. 12 ctl3 external transistor control pin. connect it to the base of an external transistor to regulate the channel 3 current. 13 fb4 led current feedback. detects the channel 4 current. 14 ctl4 external transistor control pin. connect it to the base of an external transistor to regulate the channel 4 current. 15 ctl5 external transistor control pin. connect it to the base of an external transistor to regulate the channel 5 current. 16 fb5 led current feedback. detects the channel 5 current.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 7 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions (continued) pin # name description 17 ctl6 external transistor control pin. connect it to the base of an external transistor to regulate the channel 6 current. 18 fb6 led current feedback. detects the channel 6 current. 19 ctl7 external transistor control pin. connect it to the base of an external transistor to regulate the channel 7 current. 20 fb7 led current feedback. detects the channel 7 current. 21 ctl8 external transistor control pin. connect it to the base of an external transistor to regulate the channel 8 current. 22 fb8 led current feedback. detects the channel 8 current. 23 ff fault flag output. open drain of internal n-mosfet. pulled up to external dc level in normal mode. internal mosfet turns on and the ff is pulled to gnd when open/short protection triggers. 24 ovp over-voltage protection input. connect a resistor divider from the output to this pin to program the ovp threshold. when this pi n voltage reaches 1.23v, the MP3393 triggers ovp mode. 25 gnd step-up converter power ground. 26 isense current sense. senses the voltage across the external inductor-current sensing resistor for peak current mode control and to limit induc tor current during each switching cycle. if this pin is not used for daisy-chaining with another MP3393, tie this pin to gnd: do not leave it floating. 27 gate step-up converter power switch gate output. drives the external power nmos. 28 vfault fault disconnection switch gate output. turns on the external pmos during normal operation. when the MP3393 is disabled, the ex ternal pmos turns off to disconnect the input and output.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 8 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical characteristics v in uvlo vs. temperature en uvlo vs. temperature operation frequency vs. temperature dc dimming range vs. temperature ovp protection point vs. temperature fb vs. temperature v in uvlo (v) frequency (khz) ovp (v) v dim (v) en uvlo (v) i q vs. temperature 2.000 2.100 2.200 2.300 2.400 2.500 2.600 2.700 2.800 2.900 3.000 -50 0 50 100 150 7.000 7.200 7.400 7.600 7.800 8.000 8.200 8.400 8.600 8.800 9.000 -50 0 50 100 150 0.800 1.000 1.200 1.400 1.600 1.800 2.000 2.200 2.400 -50 0 50 100 150 1.2 1.21 1.22 1.23 1.24 1.25 -50 0 50 100 150 0 20 40 60 80 100 120 140 160 -50 0 50 100 150 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -50 0 50 100 150 0.2 0.2005 0.201 0.2015 0.202 0.2025 0.203 0.2035 0.204 0.2045 0.205 -50 0 50 100 150 v fb (v) dc dimming min (0%) dc dimming max (100%)
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 9 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v in =18v, 10 leds in series, 8 strings parallel, 200ma/string, unless otherwise noted. v sw 20v/div. v out 20v/div. v comp 1v/div. i led 1a/div. v sw 20v/div. v out 20v/div. v comp 2v/div. i led 2a/div. steady state vin power on en power on dc dimming v dim = 0.8v 0.80 0.82 0.84 0.86 0.88 0.90 0.92 0.94 0.96 0.98 1.00 10 15 20 25 30 v sw 20v/div. v out 10v/div. v en 5v/div. i led 1a/div. v sw 20v/div. v out 10v/div. v pwm 5v/div. i led 2a/div. v sw 20v/div. v out 20v/div. v dim 1v/div. i led 1a/div. v sw 20v/div. v out 20v/div. v ff 10v/div. i led 1a/div. v sw 20v/div. v out 20v/div. v b 20v/div. i led 1a/div. efficiency v in (v) efficiency vs. vin v sw 20v/div. v fault 10v/div. v ff 10v/div. i led 1a/div.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 10 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. functional block diagram control logic + - current sense amplifier + - pwm comparator oscillator + - 1.23v ov comparator + - + - ctl1 feedback ctl1 control 6.4v ea led ov comparator short string protection regulator ovp isense gnd vin vcc dim comp osc en enable control 320mv gate gnd current control and fault protection ff fault management v fault fb1 ctl8 fb8 figure 1: MP3393 functional block diagram
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 11 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the MP3393 is a step-up controller with 8 internal constant current control circuit to regulate an array of 8 strings of white leds. it employs peak-current mode with programmable operation frequency. refer to the block diagram in figure 1 for some of the operational details. internal 10v regulator the MP3393 has an internal linear regulator, vcc. when vin exceeds 10v, this regulator provides a 10v 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. the MP3393 features under-voltage lockout that disables the chip until vcc exceeds the uvlo threshold. the uvlo hysteresis is approximately 400mv. system startup when the MP3393 is enabled, the chip monitors the ovp pin to see whether the schottky diode is connected and whether the boost output is shorted to gnd. the chip is disabled if the ovp voltage drops below 70mv. the MP3393 also checks for other safety limits, including under- voltage, over-voltage, and over-temperature conditions. if the device functions within normal working parameters, it boosts the output voltage with an internal soft-start. the start-up sequence consists of establishing the input voltage and the pwm dimming signal before the enable signal. step-up converter the device?s operating frequency is programmable from 100khz to 500khz through an external set resistor on the osc pin. this customizable frequency is helpful to optimize external components for size and efficiency. at the beginning of each cycle, the internal clock turns on the external mosfet. the addition of a stabilizing ramp at the output of the current-sent amplifier prevents sub-harmonic oscillations at duty cycles greater than 50%; the output is fed into the pwm comparator. when this voltage reaches the output voltage level of the error amplifier (v comp ), the external mosfet turns off. the voltage at the output of the internal error amplifier is the amplified difference between the 320mv reference voltage and the feedback voltage. the converter automatically chooses the lowest active ctlx pin voltage to provide the bus voltage to power all the led arrays. if the feedback voltage drops below the 300mv reference, the output of the error amplifier increases. this results in more current flowing through the power fet, thus increasing the power delivered to the output. in this way it forms a closed loop to regulate the output voltage. internal accurate constant current control the MP3393 employs an internal current-control circuit to provide accurate constant current regulation. the fbx pin detects the led current and provides the signal to the current-control circuit. the ctlx pin controls the external pnp transistor to accurately regulate the led current. both features improve thermal performance for high-current led applications. dimming control the MP3393 provides both analog dimming mode and external pwm dimming mode. for analog dimming mode, apply a 0.4v-to-1.5v dc signal on the pwm pin to linearly program the led current from 0% to 100%. for pwm dimming, apply an external pwm signal: the brightness of the led array is proportional to the duty cycle of the external pwm signal. use a pwm frequency range from 50hz to 2khz. open-string protection the MP3393 uses over-voltage protection (ovp) to provide open string protection: if one or more strings are open, then the voltage on the respective ctlx pin is low and the ic keeps raising the output voltage until it reaches the ovp threshold. the part can then discern the open strings and shut down it because their ctlx pin voltages are less than 210mv. once the part finishes determining the open strings, the remaining led strings force the output voltage back into tight regulation. the string with the highest voltage drop is the feedback string that regulates the output voltage. the MP3393 always tries to light at least one string: if all strings in use are open, the MP3393 shuts down the step-up converter. the open
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 12 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. strings maintain their off status until the chip restarts. short string protection the MP3393 monitors the ctlx pin voltage to determine the presence of a short string. if one or more strings are shorted, the respective ctlx pins pull up to the boost output and tolerate high voltage stress. if a ctlx pin voltage exceeds 6.5v, it meets the short string condition. when the short string fault (ctlx over-voltage fault) continues longer than 3072 clock cycles, the device marks off the shorted string and disables it. once a string is marked-off, its current regulator disconnects from the output voltage loop regulation. the marked-off led strings remain off until the chip restarts. if all strings in use are shorted, the MP3393 shuts down the step-up converter. short v out to gnd protection the MP3393 detects when v out is shorted to gnd when the ovp pin voltage is lower than 70mv, and triggers the scp. the vfault pin rises to v in to turn off the external p-mosfet, which connects the input power source to the step-up converter. fault-flag indicator in normal mode, the ff rises to vcc through the pull-up resistor. under short-circuit, open-circuit, or thermal shutdown conditions, the ff pin is pulled to gnd and indicates the appropriate fault state.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 13 3/26/2013 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 resistor on the osc pin sets the internal oscillator frequency for the step-up converter according to the equation: f sw = 16000 / r osc k ? for r osc =100k ? , the switching frequency is 160khz. setting the led current the led string currents are identical and set through the current sense resistor on the fb pin. i led = 202mv / r set for r fb =2 ? , the led current is set to 101ma. the fb pin cannot be left 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?s impedance at the switching frequency should be less than the input source impedance to prevent high-frequency switching current from passing through the input. use ceramic capacitors with x5r or x7r dielectrics for their low esr and small temperature coefficients. for most applications, use a 4.7 f ceramic capacitor in parallel with a 220f electrolytic capacitor. selecting the inductor and current sensing resistor the device requires an inductor to force the output voltage higher 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 external n-channel mosfet of step-up converter. however, the larger-value inductor is physically larger, has a higher series resistance and lower saturation current. choose an inductor that does not saturate under the worst-case load conditions. the minimum value of inductor is selected to ensure that the boost converter works in continuous conduction mode for high efficiency and good emi performance. calculate the required inductance value by the equation: 2 out sw load v d(1d) l 2 f i ? out in v v 1 d ? = where v in and v out is the input and output voltage, f sw is the switching frequency, i load is the led load 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 = out load in out in l(peak) in sw out vi v(v-v) i v 2lfv =+ where i l(peak) is the peak value of the inductor current. v sense is shown in figure 2. 276 262 248 234 220 206 192 177 163 10 20 30 40 50 60 70 80 90 current limit vs. duty cycle 0 50 100 150 200 250 300 0 20 40 60 80 100 figure 2: v sense vs duty cycle selecting external bipolar junction transistor each leds string has a bipolar junction transistor (bjt) in order to regulate led current. voltage rating and current rating of bjt should exceed 1.2 v out and 1.5i led . static forward current transfer ratio (h fe ) must be given by: h fe-min )>i led /i ctl-min
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 14 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. where ? h fe-min is minimum value of current transfer ratio on bjt manufacturer?s datasheet. ? i ctl-min is minimum threshold of maximum sink current of ctrlx pin. it is 5.5ma on ec table. selecting the power mosfet the MP3393 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 ideally, the off-state voltage across the mosfet equals the output voltage. given the turn-off voltage spike, v ds(max) should exceed 1.5v out . the maximum current through the power mosfet happens when the input voltage is at a minimum and the output power is at a maximum the maximum rms current through the mosfet is given by rms(max) in(max) max iid = where: out in(min) max out vv d v ? the current rating of the mosfet should be greater than 1.5i 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 when the gate driver charges v g from v th to v plt ; q gd is the charge during the period when v g stays at the plateau voltage. q gs1 can be read in the chart of v gs vs. q g of the mosfet datasheet. these two parameters are needed to estimate the turn-on and turn-off losses to estimate the total switching loss, p sw . 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 equation above only provides a simple estimate expression. the total gate charge, q g , is used to calculate the gate drive loss, where: sw dr g dr f v q p = where v dr is the drive voltage selecting the output capacitor the output capacitor limits the output voltage ripple and ensures feedback loop stability. select a capacitor with low impedance at the switching frequency. for best results, use ceramic capacitors with x7r dielectrics for their low esr characteristics. for most applications, use a 4.7 f ceramic capacitor in parallel with an electrolytic capacitor. select the electrolytic capacitor using the following equation: out out sw v i*d c f*p = where ? c out is the value of output electrolytic capacitor, ? i out is total output current, and ? p v is v out /v out . aim for a p v in the range of 0.05% to 0.1%. setting the over-voltage protection the MP3393 uses ovp to achieve open-string protection. in some cases, an led string open- failure results in low feedback voltage. the chip then keeps boosting the output voltage higher. if
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 15 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the output voltage reaches the programmed ovp threshold, the protection will be triggered. to make sure the chip function properly, the ovp setting resistor divider must be set with a proper value. the recommended ovp point is about 1.1 to 1.2v out for normal operation. v ovp =1.23v*(r 1 +r 2 )/r 2 extending led channels applications the MP3393 can be daisy-chained to expand the number of led channels using two or more MP3393s in parallel. to connect two MP3393s for a total of 16 led strings, see figure 5. tie the vcc pins of the master and the slave ic together to provide power to the slave ic internal logic circuitry. also tie the comp pins of the master and the slave ics together to regulate the voltage of all 16 strings leds. the mosfet driving signals of the slave ic are not used, the boost converter can be only driven by the master ic. do not leave the slave isense pin floating; tie it to gnd. the en and dim signals should be applied to both ics. use external pwm dimming mode to achieve accurate dimming synchronization of both parts. layout considerations pay close attention to the pcb board layout and components placement. proper layout of the high frequency switching path can prevent noise and electromagnetic interference problems. the high- frequency pulse current runs through the loop of the external mosfet (m2), output diode (d1, d2), and output capacitor (c3, c4). this loop must be must be as small as possible (see figure 3). figure 3: layout suggestion the exposed ic pad internally connects to the gnd pin, and all logic signals refer to gnd. the pgnd should connect externally to gnd and should be kept away from the logic signals.
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 16 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical application circuit 0 r3 10 r1 nc c6 vin1 gnd ff en dim c2 jp1 nc c3 c1 f1 l1 b360 d1 470pf c8 c4 c7 c5 357k r2 10k r5 100pf c10 0 r4 led led1 led2 led3 led4 led5 led6 led7 led8 10 r17 10 r7 2k r27 20k r28 2k r19 20k r23 10k r8 vcc c11 0 r12 c12 vcc 0.05 r13 nc r14 10v-28v 10s 8p 200ma/string am4499p m1 4.7nf c9 nc r10 m2 m3 300 r11 470pf c13 vin 1 vcc 2 comp 3 osc 4 en 5 dim 6 fb1 7 ctl1 8 fb2 9 ctl2 10 fb3 11 ctl3 12 fb4 13 ctl4 14 ctl5 15 fb5 16 ctl6 17 fb6 18 ctl7 19 fb7 20 ctl8 21 ff 23 ovp 24 gnd 25 isense 26 gate 27 vfault 28 fb8 22 MP3393e f *1 MP3393ef nc c14 100k r18 q1 0 r6 1 r15 10 r22 q2 0 r9 1 r20 10 r37 q6 0 r30 1 r35 10 r26 q3 0 r16 1 r24 10 r31 q4 0 r21 1 r29 10 r34 q5 0 r25 1 r32 10 r39 q7 0 r33 1 r38 10 r41 q8 0 r36 1 r40 figure 4: driving 8 led strings
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 17 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. 0 r3 10 r1 nc c6 vin1 gnd1 ff1 en1 dim1 4.7 /50v c2 jp1 nc c3 220 f/35v c1 f1 33 h/3a l1 b360 d1 470pf c8 2.2 f/100v c4 47 f/100v c7 2.2 f/100v c5 357k r2 10k r6 100pf c10 0 r5 10 r18 10 r8 2k r28 20k r29 2k r20 20k r24 10k r9 vcc 0.47 f c11 0 r13 1 f c12 vc c 0.05 r14 nc r15 10v -28v 10s 8p 200ma/string am4499p m1 4.7nf c9 nc r11 m2 m3 300 r12 470pf c13 vi n 1 vcc 2 comp 3 osc 4 en 5 dim 6 fb 1 7 ctl1 8 fb 2 9 ctl2 10 fb 3 11 ctl3 12 fb 4 13 ctl4 14 ctl5 15 fb 5 16 ctl6 17 fb 6 18 ctl7 19 fb 7 20 ctl8 21 ff 23 ovp 24 gnd 25 isense 26 gate 27 vfault 28 fb 8 22 MP3393ef *1 MP3393ef nc c14 100k r19 q1 0 r7 1 r16 10 r23 q2 0 r10 1 r21 10 r38 q6 0 r31 1 r36 10 r27 q3 0 r17 1 r25 10 r32 q4 0 r22 1 r30 10 r35 q5 0 r26 1 r33 10 r40 q7 0 r34 1 r39 10 r42 q8 0 r37 1 r41 10 r50 10k r44 vc c 0.47 c15 0 r47 vcc nc r46 vi n 1 vcc 2 comp 3 osc 4 en 5 dim 6 fb 1 7 ctl1 8 fb 2 9 ctl2 10 fb 3 11 ctl3 12 fb 4 13 ctl4 14 ctl5 15 fb 5 16 ctl6 17 fb 6 18 ctl7 19 fb 7 20 ctl8 21 ff 23 ovp 24 gnd 25 isense 26 gate 27 vfault 28 fb 8 22 MP3393ef *2 MP3393ef nc c16 100k r51 q9 0 r43 1 r48 10 r54 q10 0 r45 1 r52 10 r66 q14 0 r59 1 r64 10 r57 q11 0 r49 1 r55 10 r60 q12 0 r53 1 r58 10 r63 q13 0 r56 1 r61 10 r68 q15 0 r62 1 r67 10 r70 q16 0 r65 1 r69 led17 led16 led15 led14 led13 led12 led11 led10 led9 led8 led7 led6 led5 led4 led3 led2 led1 ff c o mp en d im ff en d im 2k r4 ovp o v p vfault vf a ult figure 5: driving 16 led strings (2 MP3393 in parallel)
MP3393?8-string white led driver with step-up controller MP3393 rev. 1.05 www.monolithicpower.com 18 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information tssop28ep
MP3393?8-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. MP3393 rev. 1.05 www.monolithicpower.com 19 3/26/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information soic28

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