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| MP3388 50v, 8-string white led driver MP3388 rev. 1.0 www.monolithicpower.com 1 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the MP3388 is a step-up converter with 8-channel current sources designed for driving the white led arrays for large size lcd panel backlighting applications. the MP3388 uses current mode, fixed frequency architecture. the switching frequency can be selected at 1.25mhz or 625khz. it generates an output voltage up to 50v from a 4.5v to 25v input supply. the MP3388 independently r egulates the current in each led string to the user programmed value set by an external current setting resistor. the MP3388 applies 8 internal current sources in each led string terminal to achieve a current balance of 3% regulation accuracy between strings. its low 600mv regulation voltage on led current sources reduces power loss and improves efficiency. the MP3388 features external pwm dimming or dc input pwm dimming, which allows the flexible control of the backlighting luminance. 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 ? 4.5v to 25v input voltage range ? 50v maximum step-up voltage ? balanced driver for 8 strings of wled ? 3% current matching accuracy between strings ? selectable switching frequency: 1.25mhz or 625khz ? pwm or dc input burst pwm dimming ? programmable over-voltage protection ? under voltage lockout ? open and short led protection ? thermal shutdown ? small qfn24 (4x4mm) and 28 pin soic packages ? halogens free applications ? notebook pc ? small lcd tv ? handy terminals display ? automotive system and tablet computer 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. typical application vin 4.5v~25v MP3388 vcc vin comp vfault sw2 sw1 24 23 22 21 20 19 en osc fset pwmo gnd pwmi led8 led7 led6 led5 led4 iset pgnd1 pgnd2 ovp led1 led2 led3 789101112 1 2 3 4 5 6 18 17 16 15 14 13 enable pwm dimming nc l1 d1 m1 c1 c3 c2 r1 r2 r set c4 c5 c6
MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 2 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. ordering information part number package top marking free air temperature (t a ) MP3388dr * qfn24 (4x4mm) 3388dr -40 c to +85 c MP3388ey soic28 MP3388ey -20 c to +85 c * for tape & reel, add suffix ?z (e.g. MP3388dr?z). for rohs compliant packaging, add suffix ?lf (e.g. MP3388dr?lf?z) package reference top view 1 2 3 4 5 6 18 17 16 15 14 13 en osc fset pwmo gnd pwmi pgnd1 pgnd2 ovp led1 led2 led3 led8 led7 led6 led5 iset led4 vcc vin comp vfault sw1 sw2 789101112 24 23 22 21 20 19 exposed pad connect to gnd 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 vfault comp vin vcc en osc fset pwmo gnd pwmi led8 led7 led6 led5 sw1 nc sw2 nc pgnd1 pgnd2 ovp led1 led2 led3 led4 nc iset nc qfn24 (4x4mm) soic28 absolute maxi mum ratings (1) v in .................................................-0.3v to +30v v vfault ........................................... v in - 6v to v in v sw ................................................-0.3v to +50v v led1 to v led8 .................................-0.3v to +50v all other pins ..................................-0.3v to +6v continuous power dissipation (t a = +25c) (2) qfn24 (4x4mm)??????????.....2.9w 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 ...........................4.5v to 25v maximum junction temp. (t j ) ..................125 c thermal resistance (4) ja jc qfn24 (4x4mm) ...................42 ....... 9 .... 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 power 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. MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 3 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 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 25 v supply current (quiescent) i q v in =12v, v en =5v, no load. 1.8 ma supply current (shutdown) i st v en =0v, v in =12v 2 a ldo output voltage v cc v en =5v, 6v MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 5 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. pin functions qfn24 soic28 name description 1 5 en enable control input. do not let this pin floating. 2 6 osc switching frequency selection input. when float this pin or connect this pin to vcc, the step-up converter switching fr equency is 1.25mhz. when connect this pin to gnd, the step-up converter switching frequency is 625khz. 3 7 fset dimming pwm frequency setting. connect a capacitor between fset and gnd to set the dpwm frequency by the equation: f dpwm =3.5uf/c fset . 4 8 pwmo pwm filter output. to use external pwm dimming mode, connect a capacitor between pwmo and gnd to form a low-pass filter with an internal 400k ? resistor. it filters the external pwm logic signal on pwmi pin into a dc signal whose level is inversely proportional to the duty-cycl e of the input pwm signal. then the dc signal is converted to a dpwm dimming signal with the same duty-cycle as the external pwm signal. to use dc input pwm dimming mode, directly apply a dc voltage from 0.2v to 1.2v on pwmo pin for dimming pwm duty cycle control. the dc input pwm dimming polarity is negative. 5 9 gnd analog ground. 6 10 pwmi pwm signal input. to use the external pwm dimming mode, apply a pwm signal on this pin for brightness control. this signal is filtered and its duty cycle is converted into a dc signal to calculate the dpwm duty cycle. and the dpwm duty cycle equals to the input pwm duty cycle. to use dc input pwm dimming mode, float this pin. 7 11 led8 led string 8 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 8 cathode to this pin. if this string is not used, connect vout to this pin. 8 12 led7 led string 7 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 7 cathode to this pin. if this string is not used, connect vout to this pin. 9 13 led6 led string 6 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 6 cathode to this pin. if this string is not used, connect vout to this pin. 10 14 led5 led string 5 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 8 cathode to this pin. if this string is not used, connect vout to this pin. 11 16 iset led current setting. tie a current setting resistor from this pin to ground to program the current in each led string. i led = 1000 x 1.22v /( r set +1k ? ) 12 18 led4 led string 4 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 4 cathode to this pin. if this string is not used, connect vout to this pin. 13 19 led3 led string 3 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 3 cathode to this pin. if this string is not used, connect vout to this pin. 14 20 led2 led string 2 current input. this pin is the open-drain output of an internal dimming control switch. connect the led stri ng 2 cathode to this pin. if this string is not used, connect vout to this pin. MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 6 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. pin functions (continued) qfn24 soic28 name description 15 21 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. if this string is not used, connect vout to this pin. 16 22 ovp over-voltage protection input. connect a resistor divider from output to this pin to program the ovp threshold. when this pin voltage reaches 1.23v, the MP3388 triggers ov protection mode. 17 23 pgnd2 step-up converter power ground. 18 24 pgnd1 step-up converter power ground. pgnd1 and pgnd2 should be shorted externally. 19 28 sw2 step-up converter power switch output. sw2 is the drain of the internal mosfet switch. connect the power inductor and output rectifier to sw2. sw2 can swing between gnd and 50v. sw1 and sw2 should be shorted externally. 20 26 sw1 step-up converter power switch output. sw1 is the drain of the internal mosfet switch. connect the power inductor and output rectifier to sw1. sw1 can swing between gnd and 50v. sw1 and sw2 should be shorted externally. 21 1 vfault fault disconnection switch driver ou tput. when the system starts up normally, this pin turns on the external pmos. when the MP3388 is disabled, the external pmos is turned off to disconnect the input and output. 22 2 comp step-up converter compensation pin. this pin is used to compensate the regulation control loop. connect a capa citor or a series rc network from comp to gnd. 23 3 vin supply input. vin supplies the power to the MP3388 chip. drive vin with a 4.5v to 25v power source. must be locally bypassed. 24 4 vcc the internal 5v linear regulator output. vcc provides power supply for the internal mosfet switch gate driver an d the internal control circuitry. bypass vcc to gnd with a ceramic capacitor. if vin is less than 5.5v, apply an external 5v supply directly on vcc. 15, 17, 25, 27 nc no connect MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 7 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics v in =15v, 10 leds in series, 8 strings parallel, 20ma/string, unless otherwise noted. 70 75 80 85 90 95 100 4 9 14 19 24 29 input voltage (v) efficiency(%) efficiency vs. input voltage steady state v sw 20v/div v sw 20v/div v in 10v/div v led8 500mv/div v out/ac 500mv/div v out 20v/div i led 100ma/div v sw 20v/div v led8 20v/div v out 20v/div i led 100ma/div i led 100ma/div v sw 20v/div v en 5v/div v out 20v/div i led 100ma/div v sw 20v/div v pwmi 5v/div v out 20v/div i led 100ma/div v sw 20v/div v fault 5v/div v out 20v/div i led 100ma/div v sw 20v/div v fault 10v/div v out 20v/div i led 100ma/div 400ns/div 2ms/div 2ms/div 1ms/div 200us/div 200us/div 400ms/div vin startup ven startup pwm dimming f pwm =2khz, d pwm =50% open led protection open all led strings at working short led protecton short vout to ledx at working short led protection short vout to gnd at working MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 8 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. function diagram control logic + - current sense amplifier + - pwm comparator oscillator + - 1.23v ov comparator + - + - led1 + - dpwm oscillator dpwm comparator 400k? 1.2v 0.2v current control + - 1.22v max min feedback control 5.5v ea led ov comparator short string protection regulator led8 ovp pgnd gnd vin vcc sw pwmo pwmi fset iset comp osc vfault en enable control 600mv figure 1?MP3388 function diagram MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 9 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. operation the MP3388 employs a constant frequency, peak current mode step-up converter and 8-channels regulated current sources to regulate the array of 8 strings white leds. the operation of the MP3388 can be understood by referring to the block diagram of figure 1. internal 5v regulator the MP3388 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 MP3388 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 MP3388 is enabled, the chip checks the topology connection first. the vfault pin drives the external fault disconnection pmos to turn on slowly. and after 400us delay, 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 MP3388 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 selectable (1.25mhz or 625khz), which is helpful for optimizing the external components sizes and improving the efficiency. at the beginning of each cycle, the power fet 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 power fet is turned off. the voltage at the output of the internal error amplifier is an amplified signal of the difference between the 600mv 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 600mv 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 remnant period. the fet will keep off until the output voltage needs to be boosted again. dimming control the MP3388 provides several pwm dimming methods: external pwm signal from pwmi pin or dc input pwm dimming mode (see figure 2). these methods results in pwm chopping of the current in the leds for all 8 channels to provide led control. + - dpwm oscillator dpwm comparator 400 k? 1.2v 0.2v pwmo pwmi fset ex-pwm input c pwmo c fset dpwm output 1.2v 0.2v dc input figure 2?pwm dimming method MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 10 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. when applying a pwm signal to the pwmi pin, the MP3388 generates a dc voltage on pwmo pin which is reversely proportional to the duty cycle of the pwmi pin signal. by comparing the pwmo pin signal with the fset pin triangle waveform, the converter gets a low frequency chopping signal that the duty cycle is same as the input signal. this low frequency chopping signal will modulate the led current. a dc analog signal can be directly applied to the pwmo pin to modulate the led current. and the dc signal is then converted to a dpwm dimming signal at the setting oscillation frequency. the polarity is negative. 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 fset 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 175mv. 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 MP3388 always tries to light at least one string and if all strings in use are open, the MP3388 shuts down the step-up converter. the part will maintain mark-off information until the part shuts down. short string protection the MP3388 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 1.6ms, 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 MP3388 will shut down the step-up converter. MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 11 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. application information selecting the switching frequency the switching frequency of the step-up converter is alternative for 1.25mhz or 625khz. a bi-level switching frequency selection (osc) input sets the internal oscillator frequency for the step-up converter. tie osc pin to gnd corresponds to the frequency 625khz and tie osc pin to vcc or floating corresponds to 1.25mhz. 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 +1k ? ) for r set =60.4k ? , the led current is set to 19.9ma. the iset pin can not be open. 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 1.3 times higher than the output voltage for normal operation. v ovp =1.23v x (r 1 +r 2 )/r 2 selecting dimming control mode the MP3388 provides 4 different dimming methods 1. pwm dimming mode with internal triangle waveform generator apply a 100hz to 50khz square waveform to the pwmi pin. the internal 400k ? and external capacitor on pwmo pin filters the dimming signal to a dc voltage(0.2v~1.2v).then the dc voltage is modulated to an internal pwm dimming signal whose frequency is set via the capacitor on fset pin according to the equation: f dpwm = 3.5uf / c fset the minimum recommended amplitude of the pwm signal is 2.1v (see figure 3) c1 fset pwmi pwmo MP3388 pwm dimming 100hz~50khz c2 figure 3?pwm dimming with internal triangle waveform generator 2. direct pwm dimming with positive logic an external pwm dimming signal is directly employed to achieve pwm dimming control. connect a 100k ? resistor from fset pin to gnd and apply the 100hz to 2khz pwm dimming signal to pwmi pin. the minimum recommended amplitude of the pwm signal is 1.5v (see figure 4). vcc c1 fset pwmi pwmo MP3388 pwm dimming 100hz~2khz r1 100 k o figure 4?direct pwm dimming with positive logic 3. direct pwm dimming with negative logic it is similar to method 2. apply a 100hz to 2 khz external square waveform to the pwmo pin for negative logic pwm dimming. the minimum recommended amplitude of the pwm signal is 1.5v (see figure 5), vcc c1 fset pwmi pwmo MP3388 pwm dimming 100hz~2khz r1 100 k o figure 5? direct pwm dimming with negative logic MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 12 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. 4. dc input pwm dimming to apply dc input pwm dimming, apply an analog signal (range from 0.2v to 1.2v) to the pwmo pin to modulate the led current directly. if the pwmo is applied with a dc voltage<0.2v, the pwm duty cycle will be 100%. if the pwmo pin is applied with a dc voltage>1.2v, the output will be 0% (see figure 6). the capacitor on fset pin set the frequency of internal triangle waveform. c1 fset pwmi pwmo MP3388 analog dimming 0.2v~1.2v figure 6?dc input pwm dimming selecting the inductor a 10 h (for 1.25mhz switching frequency) /22uh (for 625khz switching frequency) inductor with a dc current rating of at least 40% higher than the maximum input current is recommended for most applications. for highest efficiency, the inductor?s dc resistance should be as small as possible. 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 capacitor is sufficient. 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 2.2 f ceramic capacitor will be sufficient. layout considerations careful attention must be paid to the pcb board layout and components placement. proper layout of the high frequency switching path is critical to prevent noise and electromagnetic interference problems. the loop of MP3388 sw to pgnd pin (u1), output diode (d1), and output capacitor (c3) is flowing with high frequency pulse current. it must be as short as possible (see figure 7). sw pgnd gnd d1 c2 r1 iset rset u1 r2 figure 7?layout consideration the ic exposed pad is internally connected to gnd pin, and all logic signals are refer to the gnd. the pgnd should be externally connected to gnd and is recommended to keep away from the logic signals. MP3388- 50v, 8-string white led drivers MP3388 rev. 1.0 www.monolithicpower.com 13 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package information qfn24 (4mm x 4mm) side view top view 1 24 19 18 13 12 7 6 bottom view 3.90 4.10 2.50 2.80 3.90 4.10 2.50 2.80 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 2.70 0.25 recommended land pattern 3.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing confirms to jedec mo-220, variation vggd. 5) drawing is not to scale. pin 1 id see detail a pin 1 id option a 0.30x45 o typ. pin 1 id option b r0.25 typ. detail a pin 1 id index area 0.70 0.35 0.45 0.50 MP3388- 50v, 8-string white led drivers 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. MP3388 rev. 1.0 www.monolithicpower.com 14 12/16/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package information (continued) soic28 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 0.10 millimeters max. 5) drawing conforms to jedec ms-013, variation ae. 6) drawing is not to scale. 0.013(0.33) 0.020(0.51) 0.697(17.70) 0.713(18.10) seating plane 0.050(1.27) bsc pin 1 id 0.291 (7.40) 0.299 (7.60) 0.394 (10.00) 0.418 (10.60) 1 14 15 28 0.093(2.35) 0.104(2.65) 0.004(0.10) 0.012(0.30) top view front view side view 0.009(0.23) 0.013(0.33) recommended land pattern 0.370 (9.40) 0.079 (2.00) 0.024 (0.61) 0.050 (1.27) see detail "a" 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.030(0.75) x 45 o 0.010(0.25) bsc gauge plane |
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