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MP44011 boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 1 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the MP44011 is a boundary-conduction?mode pfc controller with an internal-harmonic? injection function. it provides simple and high- performance active power-factor correction with minimal external components. compared against traditional boundary- conduction?mode pfc controllers, the harmonic-injection function makes the part suitable for led lighting applications. in led lighting applications with two-stage structures, the harmonic-injection function can effectively reduce bus capacitance between the ac/dc and the dc/dc stage. in addition, harmonic injection can reduce the transformer size to save board space and bom cost. also, the benefits of a harmonic-injection function also apply to general boost or flyback pfc applications. the MP44011 is derived from the mp44010, except with a harmonic-injection function. the MP44011 is available in an 8-pin soic package. features ? boundary-conduction?mode pfc controller for pre-regulation ? reduced bus capacitance ? reduced transformer size ? internal harmonic-injection function ? precise adjustable-output over-voltage protection ? ultra-low start-up current ? very low quiescent current ? on-chip filter for current-sense pin ? disable function ? available in soic-8 applications ? led lighting driver ? general pfc pre-regulators for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. patents pending. typical application v ac r10 u1 gate fb cs gnd comp zcs vin mult MP44011 t1 d1 r9 d3 r1 r2 c2 r11 feedback network vbus c1 r3 d2 r4 r5 r6 r7 r8 c4 c5 c6 c3 d1 dc/dc q1
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 2 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ordering information part number package top marking junction temperature (t j ) MP44011hs * soic8 MP44011 -40c to +125c * for tape & reel, add suffix ?z (e.g. MP44011hs?z). for rohs compliant packaging, add suffix ?lf (e.g. MP44011hs?lf?z). package reference fb comp mult cs vin gate gnd zcs 1 2 3 4 8 7 6 5 top view absolute maxi mum ratings (1) supply voltage (v in ) ...................... -0.5v to +23v analog inputs and outputs .......... - 0.3v to +6.5v zcs maximum current ............ -50ma to +10ma power dissipation (t a =25c) (2) soic8 ........................................................ 1.4w junction temperature????????..150c lead temperature (solder)....................... 260c storage temperature ............... - 55c to +150c recommended operating conditions (3) supply voltage (v in ) ....................... 13.4v to 22v analog inputs and outputs ............. - 0.3v to +6v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc soic8 ..................................... 90 ...... 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), 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 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 operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 3 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. electrical characteristics v in = 15v, t a =t j = 25c, unless otherwise noted. parameter symbol condition min typ max units supply voltage operating range v in after turn on 10.7 22 v turn-on threshold v in on 11 12.4 13.4 v turn-off threshold v in off 8.7 9.8 10.7 v hysteretic voltage v in h y s 2.2 3 v zener voltage v z i in =5ma 22 25 28 v supply current start-up current i startu p v in =11v 15 40 a quiescent current i q no switch 0.46 0.65 ma operating current i in f s =70khz, c o =1nf 1.6 2.5 ma multiplier input bias current i mult -1 a linear operation range v mult 0 to 3 v output max. slope v cs / v mult 1.62 1.85 v/v gain (5) k 0.6 0.82 1/v error amplifier feedback voltage v fb 2.465 2.5 2.535 v feedback voltage line regulation v fb_lr vin=10.7v to 22v 2 5 mv feedback bias current i fb 0.2 a open loop voltage gain (6) g v 60 80 db gain-bandwidth product (6) gb 1 mhz source current i comp _ source -5 -4 -2 ma sink current i comp _ sink 2.5 5.5 ma upper clamp voltage v comp _ h 5.3 6 6.6 v lower clamp voltage v comp _ l 2 2.2 2.4 v current sense comparator input bias current i cs -1 a delay t dt 300 450 ns current sense clamp voltage v cs clam p 1.6 1.72 1.83 v current sense offset v cs_offset v mult =0v 30 mv v mult =2.5v 5 mv zero current sensor upper clamp voltage v zcsclam p h i zcs =2.5ma 7.2 7.8 v
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 4 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. electrical characteristics (continued) v in = 15v, t a = t j =25c, unless otherwise noted. parameter symbol condition min typ max units lower clamp voltage v zcsclam p l i zcs =-2.5ma 0.3 0.55 0.8 v zero current sensing threshold v zcs h v zcs rising 2.1 2.3 v v zcs l v zcs falling 1.15 1.35 v zcs_en threshold v zcs en r v zcs rising 310 mv zcs_en hysteresis v zcs en h y s 120 mv source current capability i zcs source -3 ma restart current after disable i zcs res -85 -60 a re-starter re-start time t start 80 175 280 s over-voltage dynamic ovp current i ovp 30 40 50 a hysteresis i ovp h y s 30 a static ovp threshold v ovp 2 2.2 2.4 v gate driver dropout voltage v oh i gdsource =20ma 2.4 3 v i gdsource =200ma 4.8 5.4 v v ol i gdsink =200ma 1.2 1.5 v voltage fall time t f 30 70 ns voltage rise time t r 40 80 ns max output drive voltage v dmax 12 13.5 15 v source current capability i gate source -350 ma sink current capability i gate sink 600 ma uvlo saturation voltage v saturation v in =0 to v in_on , i gate sink =10ma 0.3 v note: 5) the multiplier output is given by: v cs =kv mutl (v comp -2.5) 6) guaranteed by design.
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 5 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performance characteristics v in = 15v, t a = 25c, unless otherwise noted. supply current vs. t j start-up & uvlo vs. t j feedback reference vs. t j delay-to-output vs. t j v in zener voltage vs. t j multiplier characteristic multiplier gain vs. t j ovp current vs. t j v in (v) supply current vs. supply voltage 0.001 0.01 0.1 1 10 100 0 5 10 15 20 25 0.01 0.1 1 10 -50 0 50 100 150 8 9 10 11 12 13 14 -50 0 50 100 150 v in threshold (v) -50 0 50 100 150 v in zener voltage (v) 2.4 2.45 2.5 2.55 2.6 -50 0 50 100 150 v fb (v) 100 200 300 400 500 -50 0 50 100 150 30 35 40 45 50 -50 0 50 100 150 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 mult (v) cs (v) 0 0.2 0.4 0.6 0.8 1 -50 0 50 100 150 multiplier gain 023 14 comp=2.6v comp=3v comp=3.5v comp=4v comp=4.5v comp=5v comp=upper clamp rising falling operating current quiescent current start-up current 20 21 22 23 24 25 26
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 6 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics ( continued ) v in = 15v, t a = 25c, unless otherwise noted. v gd dropout (v) gate-drive output high saturation gate-drive output low saturation v gd (v) zcs clamp(v) zcs clamp levels vs. t j 0 2 4 6 8 10 -50 0 50 100 150 234567 0 1 2 3 4 0 50 100 150 200 250 300 350 400 0 100 200 300 400 500 600 700 800 upper clamp lower clamp
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 7 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics ( continued ) performance waveforms are generated on the evaluation board built with design example. v ac =110v, v bus =70v, i out =350ma, p out =30w, t a =25c, unless otherwise noted.
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 8 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. pin functions pin # name description 1 fb feedback. connect to the output voltage through a resistor divider. 2 comp error amplifier output. connect a compensa tion network between this pin and the fb pin. 3 mult multiplier input. connect to the rectified main voltage through a resistor divider to provide the sinusoidal reference for the current control loop. also senses input ac voltage and injects constant ratio harmonics 4 cs current sense. senses the current through the mosfet using a resistor. provides internal sinusoidal reference when compared with the output of the internal multiplier to determine mosfet?s turn-off. on-chip r/c filter re duces high-frequency noise on this pin. 5 zcs current-zero?crossing sense. a negative goi ng-edge triggers the mosfet to turn on. 6 gnd ground. 7 gate gate driver output. the large gate-driver curr ent can drive the gate of the low-cost high- power mosfet in the system. the pin voltage is clamped to 15v in case this pin is supplied with a high vcc. 8 vin supply voltage. powers both the signal block and gate driver. use a bypass capacitor from this pin to ground to reduce the noise. block diagram 2 . 5 v + - fb comp mult cs + - uvlo v re f zcs gate vin gnd multiplie r +- overvoltage detection r s q + - 2.1 v 1 . 35 v disable starter driver v oltage regulato r 150k 1 . 4pf harmonic injection generation figure 1: functional block diagram
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 9 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. applications the MP44011 is a boundary-conduction?mode pfc controller with internal harmonic injection that is optimized for led lighting drivers. output voltage regulation the fb pin senses the output voltage through a resistor divider from the output voltage to ground. an accurate on-chip reference voltage and a high-performance error amplifier accurately regulate the output voltage. over-voltage protection MP44011 offers two of over-voltage protection methods: dynamic and static. these two methods ensure that the circuit operates in a reliably safe region. when the load is very low, the output voltage tends to stay steadily above the nominal value. under this condition, the error amplifier output saturates low. when the error amplifier output falls below 2.2v, the static ovp triggers and blocks the gate driver to turn off the external power mosfet and enter an idle state. normal operation resumes until the error amplifier output goes back into the regulated region. 2.5v + - inv comp uvlo gate multiplier overvoltage detection driver vo r9 r10 i r9 i r10 figure 2: ovp detector block for the boost pfc application, MP44011 implements ovp by monitoring the current through the comp pin. in steady-state operation, the current flows through the high-side feedback resistor (r9) and low-side feedback resistor (r10) are: ofb fb r9 r10 vv v ii r9 r10 ? ??? if there is an abrupt rise on the output ( v o ), the voltage on fb pin remains at the reference value as the compensation network between fb pin and comp pin features a long time-constant for a high power factor (pf). the current through r10 remains equal to v fb /r10, but the current through r9 becomes: ' oofb r9 vvv i r9 ?? ? ? the current must flow into the comp pin. at the same time, the chip internally monitors the current. if the current rises to 35a, the output voltage of the multiplier decreases, thus reducing the the energy delivered to output. if the current rises to about 40a, the dynamic ovp triggers. then gate driver is blocked to turn off the external power mosfet and the MP44011 enters an idle state. the device will remain in this state until the current falls below 10a. then the internal starter is re-enabled and allows switching to restart. disable function pulling the zero current sensing (zcs) pin lower than 190mv disables to MP44011 in order to further reduce the quiescent current when the pfc pre-regulator needs to be shutdown. after releasing the zcs pin, it will stay at lower clamp voltage if there is no external voltage from the auxiliary winding. boundary conduction mode zcs gate r sq + - 2.1v 1.35v disable starter driver v aux figure 3: zcs, triggering, and disable block
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 10 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. when the inductor current reaches zero, the inductor voltage reverses. then the zcs generates the turn-on signal for the mosfet by sensing the falling edge of the voltage on the auxiliary winding coupled with the inductor. if the zcs voltage goes higher than 2.1v, the comparator waits until the voltage falls below 1.35v. if the voltage falls below 1.35v, the MP44011 turns on the mosfet. the 7.8v high clamp and 0.55v low clamp protect the zcs pin. the internal timer generates a mosfet turn-on signal if the driver signal is low for more than 175s, and can turn on the mosfet during start-up since there is no zcd signal is generated during this period. zero-crossing compensation the MP44011 offers a 30mv voltage offset for the multiplier output near the line votlage?s zero- crossing that can force the circuit to process more energy at the bottom of the line voltage. this function reduces the total harmonic distortion (thd) of the current. to prevent excess energy consumption, this offset reduces as the instantaneous line voltage increases so that the offset is negligible near the top of the line voltage. harmonic injection function vac t1 d1 rs vbus c1 cbus d2 q1 figure 4: flyback pfc main circuit peak primar y current primary cur rent average primary current figure 5: primary current waveform of traditional bcm flyback pfc the flyback pfc application exemplifies the harmonic injection function for this document. for a traditional bcm flyback pfc, the transformer acts like two coupled inductors where the current will not flow through both windings at the same time; the current is discontinuous. the primary current rises from the zero crossing and the secondary current returns to zero for every switching cycle. the average input current is related to both the peak primary current and the duty cycle. peak primary current primary current average primary current figure 6: primary current waveform of flyback pfc with the MP44011 for the MP44011, the mult pin senses the ac input line and injects constant ratio harmonics into sensed line voltage, so the peak primary current reference has a choppy sinusoidal signal. as a result, the peak primary current flowing through the transformer is sharply reduced, and the circuit can use a smaller transformer core that will not saturate. in addition, harmonic injection into the input current reduces the input power fluctuation: this results in a smaller output voltage ripple on the output capacitor, and allows for the use of smaller capacitors. therefore, the MP44011?s internal harmonic injection function can reduce both bus capacitor values and transformer size. however, there is a trade-off between smaller core and performance: a smaller core can have more winding layers and therefore greater leakage inductance. this leakage reduces efficiency and increase device voltage stress..
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 11 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. frequency of traditional bcm flyback pfc frequency of MP44011 swithing frequency t 0t line /2 figure 7: switching frequency even with the same transformer core as used for a traditional bcm pfc, the efficiency improves with harmonic injection. with harmonic injection, the minimum frequency occurs not at the top of the line but at the line?s choppy regions. compared with traditional bcm pfc, the frequency at the top of the line increases. power factor correction the MP44011 senses the inductor current through the current sense pin and compares it to the choppy sinusoid signal which is generated from the multiplier output. when the external power mosfet turns on, the primary inductor current rises linearly. when it reaches the choppy sinusoid signal, the external power mosfet turns off and the secondary diode turns on. then the secondary inductor current begins to fall. when the secondary inductor current reaches zero, the power mosfet turns on again, which causes the primary inductor current to start rise . the power circuit works in boundary conduction mode and inductor current?s signal envelope has a choppy sinusoidal shape. the average current also has a choppy sinusoidal shape. this control method can achieve a high power factor. layout guide for boundary-mode pfc operation, the output feeds back to the fb pin for comparison with the reference voltage. therefore, a constant reference voltage is very important for an accurate output. use short traces to connect the fb pin to the feedback resistors. a rectified ac voltage and comp voltage generates the multiplier output, which generates the inductor current envelope. place a small ceramic capacitor from the mult pin to s-gnd and place compensation components close to the comp pin and s-gnd to improve noise immunity. for zero-current sensing, place r5 close to the zcs pin to prevent noise caused by long wire. for inductor current sensing, keep the trace from the current-sensing resistor to the cs pin pin as short as possible?even though there is an on- chip filter on the cs pin?to prevent falsely turning off mosfet. if the design bars the use of a short trace, add an external filter from the sense resistor to the cs pin. to prevent noise from p-gnd, limit the connection between p- gnd and s-gnd to one point. to keep the chip operational with a stable vin voltage, keep the vin capacitor as close to the vin pin to limit voltage fluctuations.
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 12 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. design example for flyback pfc with MP44011 1. design specifications: input voltage range: v ac =85v-265v typical mains frequency: f l =50hz dc output voltage: v out =70v maximum output power: p out =30w maximum 2f l output ripple: v o =28v peak-to-peak minimum switching frequency: f min =40khz harmonic injection ratio: k 2 =0.75 reflected voltage: v r =210v leakage inductance overvoltage: v=100v expected efficiency: =85% 2. preliminary calculations: minimum input peak voltage: v pkmin =v acmin 2 =120v maximum input peak voltage: v pkmax =v acmax 2 =375v maximum input power: p in =p out / =35.3w peak-to-reflected voltage ratio: k v =v pkmin /v r =0.57 characteristic functions value: -3 v v v 0.5+1.4 10 k f2(k )= 1+0.815 k ?? ? -4 v v v 0.424+5.7 10 k f3(k )= 1+0.862 k ? ? -3 v v v 0.25-1.5 10 k f4(k )= 1+1.074 k ?? ? 2.1 peak primary current 1in pkp pkmin v 2k p i1.51a vf2(k) ? ?? ? for MP44011, the coefficient k 1 is the peak primary-current ratio compared with the traditional crm pfc. here, k 1 =0.87. 2.2 rms primary current: v2 rmsp pkp f2(k k ) i=i =0.53a 3 ? ? 2.3 peak secondary current: out pks out v v 2p i = =4.29a vkf2(k) ? ?? 2.4 rms secondary current: v rmss pks f3(k ) i=i =1.03a 3 ? power stage design 3. diode bridge the maximum input rms current is: in ac _ max ac_min p i0.42(a) v ?? to provide a sufficient margin, select gbu406 (600v/4a). 4. input capacitor by setting the coefficient r to 0.1, obtain the input capacitance by using the equation below: ac_max 6 in min ac _ min i c = 0.19 10 (f) 2 frv ? ?? ??? use a 0.22 f tantalum capacitor with a 630v voltage rating as the input capacitor to provide high-frequency energy during switching cycle. 5. transformer calculate the primary inductance using the following: pkmin 2 p 2vminpkp vk l= =1.0mh (1+k k ) f i ? ???
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 13 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the turn ratio is: r out v n= =3 v then a p is: p pkp rmsp 94 pew max c li i a =a a = 1.27 10 mm bkj ? ?? ??? ?? where: a e is the effective area of the core section; a w is the effective area of the core window; b max is the max swing of the magnetic flux density (generally b max =0.3~0.4t); k c is the window coefficient, which is about 0.3 in design; j is the current density of the wire, which is typically 4-6a/mm 2 . the ee25 core is selected according to a p . the primary inductor turn number is: ppkp p max e li n110 ba ? ?? ? the needed air gap is: 2 pe 4 p na 6.08 10 m l ? ??? ?? ? ? and the secondary winding turn number is: p s n n36 n ?? 6. mosfet the maximum drain voltage is: dsmax pkmax r v=v v v=685v ?? the maximum rms mosfet current is: qrms_max rmsp i =i =0.53 a and the pulse-drain current is: q_pulse pkp i>i=1.51 a the fqpf8n80c (800v/8a) meets the power requirement of the design. 7. secondary diode the maximum rms current of the output diode is: drms_max rmss i =i =1.03a and the maximum reverse voltage is: pkmax dmax out v v= v 194v n ?? uf3004 (400v/3a) meets the design criteria. 8. output capacitor the output capacitor is selected only based on output voltage ripple out v out 3 lvo i f4(k ) 1 c= k 38f 2 ff2(k) v ? ???? ?? where k 3 =0.85. the cap (47 f/100v) is selected as the bus capacitor. 9. sense resistor assuming a peak value of 2.5v (@v ac_max =265v) on the multiplier input, the peak value at the minimum line voltage is v multpkmin =2.5 85/265=0.8v which is multiplied by the maximum slope of the multiplier, 1.62, giving a 1.32v peak on the current sense. so the sense resistor will not exceed: sen pkp 1.32 r0.87 i ? ?? considering the power consumption, select a 0.4 ? sense resistor. the first stage of flyback pfc design is complete. our evaluation board adds two channels of dc/dc using the mp4689 to constitute a system for the led driver. for mp4689 applications, please find mp4689 datasheet for details. figure 8 shows the application schematic with power stage design. the typical performance and circuit waveforms are shown in the typical performance characteristics section. for more possible applications of this device, please refer to related evaluation board datasheets.
MP44011 ? boundary-mode pfc controller with harmonic injection MP44011 rev. 1.01 www.monolithicpower.com 14 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. vac r10 u1 gate fb cs gnd comp zcs vin mult MP44011 t1 d1 gbu406 r9 d3 r1 r2 c2 r11 feedback network c1 r3 d2 r4 r5 r6 r7 r8 c4 c5 c6 47uf c3 d1 uf3004 dc/dc mp4689 emi filter dc/dc mp4689 q1 fqpf8n80c 0.22uf 0.4 figure 8: design example of 30w led lighting with MP44011
MP44011 ? boundary-mode pfc controller with harmonic injection 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. MP44011 rev. 1.01 www.monolithicpower.com 15 1/12/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 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 14 85 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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