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| ? macroblock, inc. 2010 floor 6-4, no. 18, pu-ting rd., hsinchu, taiwan 30077, roc. tel: +886-3-579-0068, fax: +886-3-579-7534, e-mail: info@mblock.com.tw - 1 - macroblock preliminary datasheet MBI6703 dc-dc boost controller with min. selecto r december 2010, v1.00 features z 10v~30v wide input voltage range z adjustable switching frequency: 75khz to 250khz z peak current mode control z external soft-start function z drive external power mosfet z minimum selector supports up to 4 feedback inputs z full protections: ? under voltage lockout, uvlo ? over temperature protection, otp ? over voltage protection, ovp ? over current protection, ocp ? input voltage protection, ivp z tssop-24 package product description MBI6703 is a frequency-adjustable, peak current mode step-up dc/dc controller to drive external constant current led drivers, ex. mbi1838, with multi-strings. it is designed for large lcd panels that employ an array of leds as the light source. MBI6703 accepts wide input voltage range from 10v to 30v. MBI6703 can receive external pulse widt h modulation (pwm) dimming control signal to turn on/off the output voltage according to the dimming. MBI6703 is built with complete protection features to pr otect the controller from fault situations. the soft-start function eliminates the inrush current while the power is on. the integrated protections, uvlo, ovp, ocp, otp, and ivp, avoid MBI6703 from being damaged from fault conditions. MBI6703 supports 4 external feedbacks from the external co nstant current led drivers in parallel, and builds in a minimum voltage selector to choose the lowest voltage to make sure all the arrays of leds are well controlled. MBI6703 drives an external mosfet, which provides good efficiency and maximizes operating voltage. the feature of selectable switching frequency allows optimizatio n of the component size and system efficiency. MBI6703 is available in a tssop-24l-173-0.65 package. applications z lcd tv thin shrink sop gts: tssop24l-173-0.65
december, 2010, v1.00 - 2 - MBI6703 dc-dc boost controller with min. selector typical application circuit gnd vcch out0 out1 out2 out3 out4 out5 out6 out7 light bar 1 4 strings 18 pcs leds per string 120ma 120ma 120ma 120ma out0 out1 out2 out3 out4 out5 out6 out7 light bar 2 4 strings 18 pcs leds per string 120ma 120ma 120ma 120ma fig. 1 bom list of typical application circuit (fig. 1) designator qty. part number desc ription vendor contact information u1 1 MBI6703 boost controller, tssop24. mbi www.mblock.com.tw m1 1 ap40t10gh i d =39a, b vdss =100v, v gs =20v, to-252. apec www.a-power.com.tw d1 1 mbr16100dc i f =16a, v r =100v, to-263. panjit www.panjit.com l1, l2 2 gsdrk127p-220 22uh, 7a, 40mohm. gotrend www.gotrend.com.tw cl, cid 2 cc0603krx7r9bb102 1nf, 50v, 0603. yageo www.yageo.com cc2 1 cc0603krx7r9bb104 100nf, 50v, 0603. yageo www.yageo.com css 1 cc0603krx7r9bb474 470nf, 50v, 0603. yageo www.yageo.com cvreg 1 cc0603krx7r7bb105 1uf, 16v, 0603. yageo www.yageo.com cvdd 1 cc0805krx7r9bb105 1uf, 50v, 0805. yageo www.yageo.com ci1 1 grm32er72a225k 2.2uf, 100v, 1210. murata www.murata.com/index.html co1, co2 2 eky-101ell560mh20d 56uf, 100v, 565ma. chemicon www.chemi-con.co.jp/e/index. html ci2 1 eky-101ete101mk16s 100uf, 50v, 555ma. chemicon www.chemi-con.co.jp/e/index. html rg 1 wr06w1r00 ftl 1 ? /1%/0603 walsin www.passivecomponent.com rvdd 1 wr06w10r0 ftl 10 ? /1%/0603 walsin www.passivecomponent.com rf 1 wr06x4302 ftl 43k ? /1%/0603 walsin www.passivecomponent.com rl 1 wr06x1001 ftl 1k ? /1%/0603 walsin www.passivecomponent.com rvin2 1 wr06x2001 ftl 2k ? /1%/0603 walsin www.passivecomponent.com rovp2, rvin3 2 wr06x1002 ftl 10k ? /1%/0603 walsin www.passivecomponent.com rvin1 1 wr06x1803 ftl 180k ? /1%/0603 walsin www.passivecomponent.com rfb1 1 wr06x5103 ftl 510k ? /1%/0603 walsin www.passivecomponent.com rovp1 1 wr06x6203 ftl 620k ? /1%/0603 walsin www.passivecomponent.com rs1 1 ww12xr330ftl 33m ? /1%/1206/0.25w walsin www.passivecomponent.com december, 2010, v1.00 - 3 - MBI6703 dc-dc boost controller with min. selector functional diagram minimum voltage selector fb0 fb1 fb2 fb3 v fb_ ref 2 gdout control logic circuit en oe error amplifier vcch comp vsovp ss vreg hv ldo1 hv ldo2 oscillator vin_det 120%*v inp_ ref 90%*v inp_ ref vcc 5v v ovp_ ref gndd v cs_ ref gnda slope compensation soft start circuit r- freq cs 5v i ss sr q uvlo otp i s 5v ocp comparator ovp comparator ivp comparator 1 ivp comparator 2 500k ? 500k ? fig. 2 december, 2010, v1.00 - 4 - MBI6703 dc-dc boost controller with min. selector pin configuration MBI6703gts (top view) pin description pin no pin name function 24 vcch supply voltage terminal. 21 vcc 5v linear regulator output for pulling unused feedback inputs to high. 1 gnda analog ground terminal. 15 gndd digital ground terminal. 3 comp boost converter compensation pin. 4 oe output enable terminal when oe is active (high), all output pins are enabled; when oe is inactive (low), all output pins are turned off (blanked). 5 en shut down control input. when en is high, the chip is enabled. when en is low, the chip is disabled. 6 vin_det vcch input range detection. if input voltage >1.2 x expected vcch or <0.85 x expected vcch, the converte r will shut down. when the input voltage recovers 0.9 x expected vcch december, 2010, v1.00 - 5 - MBI6703 dc-dc boost controller with min. selector 22 vsovp over voltage sense input. 2, 7, 14, 18, 20, 23 nc no connection. - thermal pad power dissipation terminals connect to gnd*. *to eliminate the noise influence, thermal pad is su ggested to connect to gnd on pcb. in addition, a heat-conducting copper foil on pcb soldered with therma l pad will improve the desired thermal conductivity. december, 2010, v1.00 - 6 - MBI6703 dc-dc boost controller with min. selector maximum ratings operation above the maximum ratings may cause device fa ilure. operation at the extended periods of the maximum ratings may reduce the device reliability. characteristic symbol rating unit supply voltage v cch -0.4~33 v 5v regulator output voltage v cc -0.4~6 v 10v regulator output voltage v reg -0.4~12 v gate driver output voltage (gdout) v gdout -0.4~12 v logic input voltage of en, oe, vin_det, fb3, vsovp, cs pins v logic -0.4~6 v power dissipation** (on pcb, ta = 25c) gts p d 3.29 w thermal resistance*** (by simulation) r th(j-a) 38 c/w empirical thermal resistance**** (on pcb, ta = 25c) 105 operating junction temperature t j , max 150 c operating ambient temperature t opr -40~+85 c storage temperature t stg -55~+150 c **users must notice that the power dissipati on should be within the safe operation area. *** the pcb size is 76.2mm*114.3mm in simulation. ****the pcb size is 4 times larger than that of ic and wit hout extra heat sink. the thickness of the pcb is 1.6mm, copper foil 1 oz. the thermal pad on the ic?s bottom has to be mounted on the copper foil. december, 2010, v1.00 - 7 - MBI6703 dc-dc boost controller with min. selector electrical characteristics test condition: v in = 24v, gnd = 0v, ta = 25c, unless otherwise specified. characteristic symbol condition min. typ. max. unit supply voltage v cch v in =v cch 10 - 30 v output voltage of v cc v cc 12 december, 2010, v1.00 - 9 - MBI6703 dc-dc boost controller with min. selector typical operating characteristics fig.4 power on sequence with v in protection, v in =24v, i vled =0.96a fig. 5 power off sequence with v in protection, v in =24v, i vled =0.96a fig. 6 en enable, v in =24v, i vled =0.96a fig.7 en disable, v in =24v, i vled =0.96a fig. 8 pwm dimming freq=120hz, duty=50%, v in =24v, i vled =0.96a fig. 9 pwm dimming freq=1khz, duty=50%, v in =24v, i vled =0.96a v in v led v ss i v led v en v led v ss i v led v en v led v ss i v led v oe i v led v led (ac) v comp v oe v led (ac) v comp i v led (no load) (no load) v in v led v ss i v led december, 2010, v1.00 - 10 - MBI6703 dc-dc boost controller with min. selector fig. 10 over-voltage happened due to led open string, v in =24v, i led =0.96a fig. 11 led short protection, v in =24v, i vled =0.96a fig. 12 thermal shutdown released, v in =24v, i vled =0.96a fig. 13 thermal shutdown v in =24v, i vled =0.96a 0 50 100 150 200 250 300 0 102030405060 setting resistance, rf( ? ) switching frequency(khz) fig. 14 r-freq and switching freq. relationship fig. 15 efficiency versus i led , switching frequency is 75khz 88 90 92 94 96 98 100 0.0 0.3 0.6 0.9 1.2 1.5 i led (a) efficiency(%) vin=36v vin=24v vin=12v v comp v led v fbo i v led v led v ss v fbo i v led v led v ss v fbo i v led v led v out0 u2 i v led v comp december, 2010, v1.00 - 11 - MBI6703 dc-dc boost controller with min. selector fig. 16 efficiency versus i led , switching frequency is 100khz fig. 17 efficiency versus i led , switching frequency is 150khz 500 540 580 620 660 700 0 102030405060 v cch (v) quiescent current(a) fig. 18 efficiency versus i led , switching frequency is 250khz fig. 19 quiescent current in normal operation 0 5 10 15 20 0 102030405060 v cch (v) quiescent current in shutdown(a) 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.65 10 20 30 40 50 60 v cch (v) reference voltage of fb0(v) fig. 20 quiescent current in shutdown mode fig. 21 internal reference voltage of fb0 versus v cch 88 90 92 94 96 98 100 0.0 0.3 0.6 0.9 1.2 1.5 i led (a) efficiency(%) vin=36v vin=24v vin=12v 88 90 92 94 96 98 100 0.0 0.3 0.6 0.9 1.2 1.5 i led (a) efficiency(%) vin=36v vin=24v vin=12v 88 90 92 94 96 98 100 0.0 0.3 0.6 0.9 1.2 1.5 i led (a) efficiency(%) vin=36v vin=24v december, 2010, v1.00 - 12 - MBI6703 dc-dc boost controller with min. selector 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.65 10 20 30 40 50 60 v cch (v) reference voltage of fb1(v) 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.65 10 20 30 40 50 60 v cch (v) reference voltage of fb2(v) fig. 22 internal reference voltage of fb1 versus v cch fig. 23 internal reference voltage of fb2 versus v cch 0.55 0.56 0.57 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.65 10 20 30 40 50 60 v cch (v) reference voltage of fb3(v) 0 200 400 600 800 1000 1200 0 20406080100 duty(% ) i vled (ma) fig. 24 internal reference voltage of fb3 versus v cch fig. 25 dimming linearity by using 120hz pwm signal 0 200 400 600 800 1000 1200 0 20406080100 duty(% ) i vled (ma) 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 0 1020304050 v cch (v) soft start current(a) fig. 26 dimming linearity by using 1khz pwm signal fig. 27 internal soft start current versus v cch december, 2010, v1.00 - 13 - MBI6703 dc-dc boost controller with min. selector application information MBI6703 is a current mode dc-dc boost controller that in tegrates pwm dimming control, protection functions and a minimum selector which is used to select the minimum one from the multiple feedback inputs. MBI6703 is designed with selectable switching frequency from 75khz to 250k hz, which optimizes the component size and operating frequency. MBI6703 determines the switch on-time by contro lling 2 loops. one loop is feeding back the error signal which is resulted from the difference of lowest active out put voltage and internal level. the other loop is combining switch current slope compensation. frequency selection MBI6703 provides design flexibility in selecting internal oscillator frequency from 75khz to 250khz. users are suggested to connect r-freq to gnd th rough a resistor for setting the oscilla tor frequency of st ep-up converter. higher frequency operation benefits the smaller component si ze but at the expense of efficiency due to increasing switching loss. lower frequency operation offers be tter efficiency but requires larger components. the formula of setting the switching frequency is: s 8 f 10 8 . 42 rf = . for instance, f s .=100khz, rf=42.8k ? . under voltage lock out (uvlo) MBI6703 is designed with uvlo protection. the controller is disabled until v cch exceeds the uvlo threshold of 8v. the hysteresis of uvlo is about 550mv. soft-start function the soft-start function is implemented by charging an external capacitor css. users can adjust the soft-start time by changing the capacitor. when v cch exceeds uvlo threshold, there will be the charging action. the output of gdout will be restricted by over current limitation until the terminal voltage of soft-start (vss) exceeds 0.6v. once vss exceeds 0.6v, gdout will go back to normal and begin switching. this design can effectively limit in-rush current. dimming control MBI6703 accepts pwm dimming signal from oe pin to contro l the duty of constant current. the dimming frequency can be adjusted from 100hz to 1khz. the minimum on pulse width is 10s. to achieve 1% resolution, the dimming frequency should be lower than 1khz. over voltage protection (ovp) when ovp pin exceeds the threshold, 1. 2v (typ.), the output of gdout will turn off the external mosfet to protect the step-up converter. when ovp is below 1.2v, the step-up converter switch will be enabled again. with this scheme, the anode voltage of led strings (v led ) can be maintained within the expected voltage. the voltage of ovp can be described as below: ) 2 rovp 1 rovp 1 ( 2 . 1 v ovp + = where rovp1 and rovp2 are the voltage dividers to feedback ovp voltage. ovp integrates a 50mv hysteresis. if output voltage is highe r than detecting level, 1.2v (typ.) to stop gdout output, gdout will start outputting till vso vp is down to 1.15v (typ.) december, 2010, v1.00 - 14 - MBI6703 dc-dc boost controller with min. selector over temperature protection (otp) when the junction temperature exceeds the threshold, t sd (155c), otp function turns off the output channels. as soon as the junction temperature is below 135c, t he output channels will be turned on again. the average output current is controlled by this function. as a resul t, the driver is protected from being overheated. minimum selector function MBI6703 integrates 4 voltage feedback inputs and a minimum vo ltage selector to select the lowest feedback voltage. the chosen feedback voltage will be compared wi th the internal reference voltage, v fb , 0.6v. input voltage protection (ivp) in a fixed input voltage, v cch , application, MBI6703 provides a protec tion to monitor the variation of v cch . connect v cch to the pin, vin-det, with a proper setting of voltage di vider resistors to compare the internal reference voltage, 1.2v. if the input of vin-det is higher than 120% or lower than 85%, the gate dr ive output of MBI6703 will be paused. when the input of vin_det is under 110% or above 90%, MBI6703 will resume to work. if the MBI6703 works under a variable v cch , please connect vin-det to a fixed voltage input. the voltage of ivp can be described as below: ) 3 rvin 2 rvin 1 rvin 1 ( 2 . 1 v ivp + + = over current protection (ocp) the ocp is set by an external resistor, r sen . the ocp detection threshold is 200mv. if i sen x r sen >200mv, MBI6703 will trigger the ocp to turn off the gdout. the det ection is active in every duty cycle. then internal oscillator sends a synchronous signal to turn on gdout periodically. actually, the average input current is dependent on the conversion ratio and inductance with ocp condition because the ocp is clamping the peak current not average current. december, 2010, v1.00 - 15 - MBI6703 dc-dc boost controller with min. selector package power dissipation (p d ) the maximum power dissipation, p d (max)=(tj?ta)/r th(j-a) , decreases as the ambient temperature increases. MBI6703 maximum power dissipation at various ambient temperature 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 020 40 60 80 100 power dissipation (w) gts type: rth=38c/w a mbient temperature (c) safe operation area december, 2010, v1.00 - 16 - MBI6703 dc-dc boost controller with min. selector soldering process of ?pb-free & green? package plating* macroblock has defined "pb-free" to mean semiconductor pr oducts that are compatible with the current rohs requirements and selected 100% pure tin (sn) to provide fo rward and backward compatibility with both the current industry-standard snpb-based soldering processes and hig her-temperature pb-free processes. pure tin is widely accepted by customers and suppliers of electronic devic es in europe, asia and the us as the lead-free surface finish of choice to replace tin-lead. also, it is backw ard compatible to standard 215oc to 240oc reflow processes which adopt tin/lead (snpb) solder paste. however, in t he whole pb-free soldering processes and materials, 100% pure tin (sn) will all require from 245 o c to 260 o c for proper soldering on boards, referring to jedec j-std-020c as shown below. package thickness volume mm 3 <350 volume mm 3 350-2000 volume mm 3 2000 <1.6mm 260 +0 o c 260 +0 o c 260 +0 o c 1.6mm ? 2.5mm 260 +0 o c 250 +0 o c 245 +0 o c 2.5mm 250 +0 o c 245 +0 o c 245 +0 o c *note: for details, please refer to macrob lock?s ?policy on pb-free & green package?. 0 50 100 150 200 250 300 0 50 100 150 200 250 300 temperature ( ) time (sec) 25 217 240 255 average ramp-up rate= 3.3 /s average ramp-up rate= 0.7 /s 100s max 30s max ramp-down 6 /s (max) peak temperature 245 ~260 < 10s ----maximum peak temperature recommended reflow profile 260 +0 -5 245 ? 5 acc.j-std-020c average ramp-up rate = 0.4 /s jedec j-std-020c december, 2010, v1.00 - 17 - MBI6703 dc-dc boost controller with min. selector package outline MBI6703gts outline drawing note: the unit for the outline drawing is mm. please use the maximum dimensions for the thermal pad layout. to avoid the short circuit risk, the vias or circuit traces shall not pass through the maximum area of thermal pad. december, 2010, v1.00 - 18 - MBI6703 dc-dc boost controller with min. selector product top mark information product revision history advance information device version code v1.00 a product ordering information part number rohs compliant package type weight (g) MBI6703 gts tssop24l-173-0.65 0.0967 process code g: green and pb-free part number id number manufacture code device version code the second row of printing the first row of printing product no. package code mbixxxx digits mbixxxx or december, 2010, v1.00 - 19 - MBI6703 dc-dc boost controller with min. selector disclaimer macroblock reserves the right to make changes, correction s, modifications, and improvements to their products and documents or discontinue any product or service. customers are advised to consult their sales representative for the latest product information before ordering. all products are sold subject to the terms and conditions supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. macroblock?s products are not designed to be used as compon ents in device intended to support or sustain life or in military applications. use of macroblock?s products in co mponents intended for surgical implant into the body, or other applications in which failure of macroblock?s produc ts could create a situation where personal death or injury may occur, is not authorized without the express written approval of t he managing director of macroblock. macroblock will not be held liable for any damages or claims resulting from the use of its products in medical and military applications. related technologies applied to the product are protect ed by patents. all text, images, logos and information contained on this document is the intellectual property of macroblock. unauthorized reproduction, duplication, extraction, use or disclosure of the above mentione d intellectual property will be deemed as infringement. |
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