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mp 4001 universal input high brightness white led driver MP4001 rev. 1.0 2 www.monolithicpower.com 1 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. description the mp 400 1 is a high efficiency step - down converter designed for drivin g the high brightness light emitting d iodes (leds) . the mp 400 1 drives external mosfet with boundary conduction mode which features no reverse recovery loss in the freewheeli ng diode, soft turn on with zero - current and valley voltage for the power mosfet. such operation mode can achieve very high efficiency and in the same time minimize the inductor value and size. with the boundary conduction control mode, t he led current ca n be well regulate d by control the mosfet peak current which is sensed through an external resistor. it s low 3 00mv feedback voltage reduces power loss and improves the efficiency. the MP4001 integrate s a high - voltage smart ldo, which allows the ac input to power up the ic directly . t he smart ldo sink s current when the input voltage is lower than 24 v to achieve high er efficiency. the mp 400 1 implement s both pwm and dc input burst dimming the mp 400 1 features output short protections, maximum switching frequenc y limitation, under - voltage lockout and thermal shut down . features ? constant - current led driver ? universal ac i nput ( 85v ac - 305 v ac ) ? power mosfet zero - current turn on ? h igh e fficiency boundary mode operation ? integrate d high - voltage smart ldo ? low 1ma operat ion current ? pwm or dc input burst dimming control ? hiccup short circuit protection ? m axim f requency l imited to 110 k hz ? thermal shutdown ? available in so ic 8 package applications ? non - isolated lighting ? general illumination ? industrial lighting ? automotive/ decorati ve led lighting ? lcd tv backlighting ? dc/dc or ac/dc led driver a pplications all mps parts are lead - free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. mps and the future of analog ic technology are registered t rademarks of monolithic power systems, inc. typical application mp 4001 rsense ac input leds cout d l gnd cs drive bos vcc in cin c 1 mosfet dim dim cbos q 1 vbus + - vout + - vin vsw
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 2 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. ordering information part number* package top marking MP4001ds soic8 MP4001 * for tape & reel, add suffix C z (eg. MP4001ds - z) for rohs compliant packa ging, add suffix C lf (eg. MP4001ds C lf C z) package reference absolute maximum rat ings (1) in ................................ ................ - 0.5v to 500 v vcc, drive ................................ ... - 0.3v to 11v dim, bos, cs , vs ......................... - 0.3v to 6.5v continuous power dissipation (t a =25 c ) (2) soic8..1.3w junction temperature ............................... 150 c lead temperature ................................ .... 260 c storage temperature ............... - 55 c to +150 c recommended operating conditions ( 3 ) in supply 50/60hz ac rms voltage ............................. 12 v to 350 v in supply dc voltage ..................... 12 v to 450 v v cc , drive. - 0.3v to 10.5v operating junct. temp (t j ) ...... C 40 c to + 12 5 c thermal resistance ( 4 ) ja jc soic8 ................................ ..... 96 ...... 45 ... ? 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), t he 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 regula tor 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 operating conditions. 4) measured on approximately 1 square of 1 oz copper.
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 3 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. electrica l characteristics v in = 24vdc , no load on pin drive, t a = +25 ? c, unless otherwise noted. parameters symbol condition min typ max units input with an ac voltage v inac 50/60hz ac rms at pin in 9 3 5 0 v input with a dc voltage v indc a dc voltage at pin in 9 45 0 v input supply current (quiescent) i inqs v dim = 0v 0. 64 ma input supply current (operation) i inrun v dim = 5 v 1 ma vcc internal regulated voltage vcc h v in = 1 4 - 24 v , vcc peak voltage 9.8 v vcc l v in = 1 4 - 24 v , vcc valley voltage 8.9 v vcc v in =10.5v or v in =35v 8.5 v vcc hysteresis vcc hys 0.88 v vcc uvlo vcc uvlo 6. 5 7 . 25 8 v vcc uvlo hysteresis vcc uvlo _ h ys 1 v dim input high v dimh v dim rising , v bos =1.2v 1. 5 v dim input low v diml v dim falling , v bos =1.2v 0.9 v dim pull up curr ent i dim_p ull _u p v dim =0v 10 ? a bos charge current i bos 3 4 5 ? a bos high threshold v bosh bos connect with a capacitor 2. 1 2.4 2 2. 6 v pwm dimming on propagation delay t pwm _on _pd pwm rising edge to drive rising edge 540 ns pwm dimming off propagati on delay t pwm _off _pd pwm falling edge to drive falling edge 3 s c s pin reference voltage v rs v dim =vcc, @ta = - 40c to + 8 5c 270 300 330 mv turn - off propagation delay t off _pd 100 ( 4 ) ns leading edge blanking time t leb 290 450 ns cs bias current i cs - 1 1 ? a gate drive source current i drv_ s ource v drv =0v 40 0 ( 5 ) ma gate drive sink current i drv_ s ink v drv =vcc - 1.2 ( 5 ) a drive low level output voltage v drvl i drv =10ma 43 mv drive high level output voltage to rail v drvh i drv = - 10ma 11 0 mv gat e minimal turn - on time t on_m in 40 0 ( 5 ) ns maxim switching frequency f sw_m ax 1 1 0 ( 5 ) k hz over temperature protection threshold t otp 1 5 0 ? c over temperature protection threshold hysteresis t otp_ h ys 3 0 ? c output short shut down time t sd_short wh en short circuit occurs 1. 7 m s notes : 5) guarantee by design .
MP4001 C universal i nput high brightness wled drive r mp 400 1 rev 1.0 2 www.monolithicpower.com 4 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2018 mps . all rights reserved. pin function s pin # name description 1 drive external mosfet drive output. t he zero current crossing signal is detected from this pin. 2 cs led current sense input. connect the current sense resistor that programs the led current. 3 bos burst oscillator setting. for the dc input burst dimming, connect a capacitor fro m this pin to gnd to program the burst dimming frequency. for the external pwm dimming , connect a resistor such as 300 k from this pin to gnd and apply the logic signal to the dim pin. 4 gnd ground. 5 dim dimming control input . f or dc input burst dimming control, the voltage of 0v to 2.4 2 v at dim pin linearly sets the burst - mode duty cycle from minimum to 100%. for exte rnal pwm dimming control, connect the pwm signal to dim pin. open dim pin or pull it high if no dimming control is applied. 6 in input supply pin. by connecting the in pin to ac input as power source of vcc. 7 vcc internal regulated supply voltage outp ut. must be locally bypassed. the vcc voltage provides the power for ic logic and driving external mosfet . 8 vs test pin. connect to gnd for normal operation.
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 5 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. typical performance characteristics v in = 90 - 265 vac , v led =10 - 30v, 3 - 9leds, i led =350ma, t a = +2 5 ? c, unless otherwise noted.
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 6 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. typical performance characteristics (continued) v in = 90 - 265 vac , v led =10 - 30v, 3 - 9leds, i led =350ma, t a = +25 ? c, unless otherwise noted.
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 7 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. typical performance characteristics (continued) v in = 90 - 265 vac , v led =10 - 30v, 3 - 9leds, i l ed =350ma, t a = +25 ? c, unless otherwise noted.
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 8 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. typical performance characteristics (continued) v in = 90 - 265 vac , v led =10 - 30v, 3 - 9leds, i led =350ma, t a = +25 ? c, unless otherwise noted.
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 9 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. functional block dia gram figure 1 : funct ion block diagram . c o n t r o l a n d p r o t e c t i o n c i r c u i t t h e r m a l p r o t e c t i o n u v l o o u t p u t s h o r t p r o t e c t i o n m a x o f f t i m e c o n t r o l m a x f r e q u e n c y c o n t r o l z c d c i r c u i t d r i v e d r i v e f i l t e r a n d l e b v r e f c s l d o i n g n d v c c + b u r s t o s c i l l a t o r d i m b o s a c i n
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 10 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. operation internal regulator mp400 1 employs a high - voltage with 500v break down voltage jfet circuit , which allows the universal ac line input to power the ic directly. t he MP4001 integrated a smart ldo which conducts only when the volt age on in pin is lower than 24 v. with such smart ldo design, the ic power dissipation is significantly reduced and high frequency operation is feasible. t he output waveform of vcc voltage is a sawtooth wave when this ldo is active, the peak and valley valu e of this sawtooth wave are 9.8 v and 8.9v. to avoid the risk that the vcc voltage drops too low to cause the driving capability of drive signal , the MP4001 integrated another ldo to regulate the vcc voltage to 8.5v. the following figure shows the structure of internal ldo. figure 2 : functional block diagram of ldo the mp0 is the smart ldo active only when v in is at the range of 1 4 v - 24 v and mp1 is the 8.5v ldo. figure3 shows the waveform of vcc voltage in different vcc capacitance . t o design the vcc capac itor value, the following conditions must be satisfied : 1. the mp0 should be active every time the in voltage gets to 1 4 v - 24 v. 2. the mp1 should not be active when the in voltage is higher than 24 v to ensure the high efficiency. 3. the vcc voltage can not drop to lower than vcc uvlo value. the following is to follow these limitations w here, f line is frequency of ac input, i q is the quiescent current of MP4001 , fs is switching frequency , q g is the total gate charge of power mosfe t . for most application a 10uf - 22uf vcc capacitor is recommended . figure 3 : vcc voltage in different capacitance led current regulation and valley detection with a floating buck converter configuration, as shown in the typica l application circuit, mp400 1 turns off the mosfets q 1 with a peak current control. the peak current is sensed with a resistor r sense and feeds back to c s pin. the peak current is regulated as: in normal operations, mp400 1 turn s o n q 1 when the current in the freewheeling diode goes to zero. as a result, the average led current is well regulated as: mp 0 active : 14 v < v in < 24 v mp 0 8 . 5 v mp 1 vcc high voltage switch 9 . 8 v 8 . 9 v line vcc q s g vcc vcc (9.8v 8.9v) vcc (9.8v 8.5v) 1 t 2*f i i f *q vcc c * i t ? ? ? ? ? ?? ?? ? ? ? 2 4 v 1 4 v 8 . 5 v 8 . 9 v 9 . 8 v 8 . 5 v 8 . 9 v 9 . 8 v 8 . 9 v 9 . 8 v 8 . 5 v v i n v c c v c c v c c l a r g e c a p m i d c a p s m a l l c a p l _ peak sense 300mv i r ?
MP4001 C universal i nput high brightness wled drive r mp 400 1 rev 1.0 2 www.monolithicpower.com 11 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2018 mps . all rights reserved. th e zero - current detection is realized at drive pin by sensing the mosfet drain dv/dt current through the q1s mi ller cap. when the current of freewheeling diode goes to zero , q 1 drain voltage (v sw ) drops from v bus to ( v bus - v out ) and starts oscillation caused by the inductor and the parasitic caps. when v sw reaches the minimum val u e , the dv/dt current through the mi ller cap changes from negative to zero. at this time, the MP4001 turns on q1. as a result, mp400 1 turns on q 1 when the inductor current goes to zero and q 1 drain voltage is at the minimum. MP4001 controls the buck converter operation in current boundary co nduction mode. it is usually recommended to add a 10pf cap between the drain and source of q1 to help for the zero current detection. a cap cout can be used in parallel with the led string to reduce the current ripple. such boundary operation mode can min imize the q 1 turn on loss and eliminate the freewheeling diode rever se recovery loss so that high switching frequency is possible to reduce passive components size. furthermore, the required inductance value is small, which can help further inductor size reduction. brightness dimming control mp400 1 can employs a burst dimming control scheme so that a dc signal can control the dimming by varying the dc voltage level , or an external pwm signal can control the dimming by varying the duty cycle . for the dc inp ut dimming control, a voltage from 0v to 2.4 2 v is recommended to connect to the dim pin. 2.4 2 v and above is for the 100% brightness. 120mv and below is for the 5% minimal brightness. a cap c bos is connected from bos pin to gnd to program the burst frequenc y f dim : c bos = i bos /(v bosh x f dim ) figure 4 : dc burst dimming for the pwm input dimming control, a 100hz to 2 k hz pwm signal is recommended to connect to the dim pin. bos pin is connected to gnd through a 300 k resistor, setting about 1.2v reference for the pwm input logic signal. pwm input high will make the ic switching. pwm input low turns off the ic. while doing dimming, the dimming high signal force the drive signal high and the dimming low signal force th e drive signal to low. t here will be a case that the dimming low interval is too small for inductor current reaching zero, the ccm will be observed. so the rectifying diode (d in typical application) must be ultra - fast diode or super - fast diode. figure 5 : ccm in large dimming duty for application that do not need burst dimming control, open dim pin and short bos pin to gnd frequency setting and inductor design in case the zero - current detection circuit fails, which can happe ns in start up with a large output cap and in output short condition, a maximum off time of about 1.7 ms is applied to make sure MP4001 is still in operation and the short current doesnt run away. led sense vref i 2r ? 2 . 4 2 v f d i m v d i m v b o s i l v d r i v e v d i m i l v d r i v e c c m
MP4001 C universal i nput high brightness wled drive r mp 400 1 rev 1.0 2 www.monolithicpower.com 12 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2018 mps . all rights reserved. a maximum 110 k hz switching frequency is set by mp400 1 to a void extreme losses in the circuit and ensure better emi performance. if the converter reaches the maximum frequency, it will operate in discontinuous current conduction mode. such operation mode should be avoided since the led current is out of regulation . in order to design the switching frequency f s within the 30 k hz to 11 0 k hz range, inductor design is critical. , where, v bus is the input voltage of the buck converter, v out is the led voltage. hiccup output short protection if the entire led string is shorted, v out is zero. due to the minimal on time limitation, the inductor current will be out of regulation. the mp400 1 can detect such failure and shut down for about 1. 7 ms , and then re - tries the operation. such hiccup protection can not only eliminate the thermal issue due to short circuit current, but also maintain normal operation if the protection is mis - trigger ed . under - voltage lockout (uvlo) protection under - voltage lockout (uvlo) is implemented to protect the chip from operati ng at insufficient supply voltage. the uvlo rising threshold is about 7 . 25 v while its falling threshold is a consist e nt 6. 25 v . thermal shut down protection an accurate temperature protection is implemented to prevent the chip from operating at exceedingly high temperatures. when the silicon die temperature is higher than its upper threshold, it shuts down the whole chip. when the temperature is lower than its lower threshold, the chip is enabled again . bus out out s led bus (v v ) v 1 l f 2 i v ?? ?? ??
MP4001 C universal i nput high brightness wled drive r MP4001 rev. 1.0 2 www.monolithicpower.com 13 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy a nd duplication prohibited. ? 2018 mps . all rights reserved. design example t he design example introduces a typic al application of non - isolated led lighting base on MP4001. figure 6 shows the schematic of this application. figure 6 : schematic specification: input voltage: universal input ( 90 - 265vac) led voltage: 10 - 30v led current: 3 50 ma passive pfc circuit t o im prove the power factor of this circuit, the valley fill circuit is employed. the following figures show the operation process of valley fill circuit. stage a: the ac line voltage rises from va to twice of va, the circuit is powered by ac line figure 7 : stage a of valley fill circuit stage b: the ac line voltage rises from 2v a to peak voltage of ac line voltage v p . the capacitor c 3 and c 4 is charged up by ac line , the circuit is powered by ac line. figure 8 : stage b of valley fill circuit stage c : the ac line voltage drops from peak voltage of ac line voltage v p to half of ac line peak voltage, the circuit is powered by ac line. figure 9 : stage c of valley fill circuit stage d : the ac line voltage drops from half of ac line peak voltage to the minimum v alue of bus voltage v a , the c 3 and c 4 paralleled to power the circuit . figure 10 : stage d of valley fill circuit + + cx 1 fuse lx 1 lx 2 cx 2 c 4 c 3 r 6 d 4 d 6 d 5 + + cx 1 fuse lx 1 lx 2 cx 2 c 4 c 3 r 6 d 5 d 6 d 4 + + cx 1 fuse lx 1 lx 2 cx 2 c 4 c 3 r 6 d 4 d 6 d 5 + + cx 1 fuse lx 1 lx 2 cx 2 c 4 c 3 r 6 d 4 d 5 d 6
MP4001 C universal i nput high brightness wled drive r mp 400 1 rev 1.0 2 www.monolithicpower.com 14 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2018 mps . all rights reserved. figure 11 : waveform of valley fill circuit t he valley fill circuit makes the interval that the circuit is power ed by ac line extremely increased to make increase the power factor. here choose two 22uf/250v capacitors and three 400v/1a diode to construct the valley fill circuit. select the inductor the MP4001 work in bcm, select a proper inductor value to ensure the operating frequency is at the design range: t he maximum operating frequency for MP4001 is 110khz, the frequency must set higher than 20khz to avoid noise. choose a 680uh inductor with the maximum operating f requency around 60khz and minimum operating frequency around 20khz. t he saturated current of inductor must be greater than twice of led current. select power mosfet the voltage stress of mos must be greater than the maximum input voltage (375v) . t he peak current through the mosfet is the peak value of inductor current, which equals twice of led current. t he rms current of mos can be gotten from the following equation. c hoose a mosfet with 600v voltage rating and 2.4a current rating. select rectifying diode the voltage stress of the rectifying diode must be greater than the maximum input voltage (375v). t he average current of the rectifying diode can be calculated by following equation. choose a n ultra - fast di ode with 600v voltage rating and 1a current rating. select current sense resistor the current sense resistor is selected by the following. use a 500mohm and a 2.49ohm resistor parallel as the current sense resistor. select the outpu t capacitor t he output capacitor should be large enough to filter the output ripple current and so that the led current ripple is in a desired range. f or a ceramic output capacitor, its value should be: w here rled is the dynamic res istor of led load. f s_min is the minimum operating frequency, which occurs at the minimum input voltage and maximum output voltage condition for this application. a b c d v a c v b u s v a 2 v a v p 0 . 5 v p v a bus _ max out _ min out _ min s _ max led bus _ max (v v ) v 1 l f 2 i v ?? ?? ? ?? bus _ min out _ max out _ max s _ min led bus _ min (v v ) v 1 l f 2 i v ?? ?? ? ?? out mos_ rms led bus v i 2*i * 3*v ? out d _ avg led bus v i 2*i *(1 ) v ?? cs led 300mv r 2* i ? l _ peak out s _ min led led _ ripple _ pk _ pk i c 8f r i ? ?? led led led v r i ? ? ? bus _ min led _ max led _ max s _ min l _ peak bus _ min (v v ) * v f l * i * v ? ?
MP4001 C universal i nput high brightness wled drive r mp 400 1 rev 1.0 2 www.monolithicpower.com 15 5/1/2018 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2018 mps . all rights reserved. c onsidering the i l_peak =2*i led , t hen the valu e of output capacitor is: if using an electrolytic output capacitor , its esr dominates its impedance. t he esr value should be: choose 1uf/400v electrolytic capacitor as the output capacitor. select vcc c apacit or to ensure the high efficiency, t he vcc capacitor must be designed carefully. from the formulas , choose a 22uf/16v ceramic capacitor as vcc c apacitor. emi and surge to pass the surge test, the full - wave rectifying circuit s hould be adopted for supplying the vin pin. figure 12 f ull - w ave r ectification for vin p in t o achieve good emi result , differential capacitor s and differential inductor s are needed. m ake sure no differential inductor exist between rectifying bridge and th e bus capacitor; otherwise it can not pass the surge test . figure 1 3 : emi structure 2 led bus _ min out bus _ min led _ max led _ max led led _ ripple _ pk _ pk l*i *v c 2(v v )*v r i ? ? ? ? led led _ ripple _ pk _ pk esr _ cout l _ peak ri r i ? ? line vcc q s g vcc vcc (9.8v 8.9v) vcc (9.8v 8.5v) 1 t 2*f i i f *q i * t c vcc ? ? ? ? ? ?? ?? ? ? ? vin ac + + vin ac + + l no inductor
MP4001 C universal i nput high brightness wled driver notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party i ntellectual p roperty r ights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP4001 rev. 1.0 2 www.monolithicpower.com 16 5/1/2018 mps pro prietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2018 mps . all rights reserved. package information soic8 0 . 016 ( 0 . 41 ) 0 . 050 ( 1 . 27 ) 0 o - 8 o detail " a " 0 . 010 ( 0 . 25 ) 0 . 020 ( 0 . 50 ) x 45 o see detail " a " 0 . 0075 ( 0 . 19 ) 0 . 0098 ( 0 . 25 ) 0 . 150 ( 3 . 80 ) 0 . 157 ( 4 . 00 ) pin 1 id 0 . 050 ( 1 . 27 ) bsc 0 . 013 ( 0 . 33 ) 0 . 020 ( 0 . 51 ) seating plane 0 . 004 ( 0 . 10 ) 0 . 010 ( 0 . 25 ) 0 . 189 ( 4 . 80 ) 0 . 197 ( 5 . 00 ) 0 . 053 ( 1 . 35 ) 0 . 069 ( 1 . 75 ) top view front view 0 . 228 ( 5 . 80 ) 0 . 244 ( 6 . 20 ) side view 1 4 8 5 recommended land pattern 0 . 213 ( 5 . 40 ) 0 . 063 ( 1 . 60 ) 0 . 050 ( 1 . 27 ) 0 . 024 ( 0 . 61 ) 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 . 004 " inches max . 5 ) drawing conforms to jedec ms - 012 , variation aa . 6 ) drawing is not to scale . 0 . 010 ( 0 . 25 ) bsc gauge plane

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