MP6910 fast turn-off intelligent rectifier MP6910 rev. 1. 04 www.monolithicpower.com 1 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology descri ption the mp691 0 is a fast turn-off intellig ent rectifier for flyback converters that combines a 100v power switch that repla c es diode r e ctifiers for high efficien cy. the chip regulates the forward voltage drop of the internal power switch to about 70mv and turns it off before the voltage goes negative. features ? supports dcm and qu asi-resona nt flyback con v erter ? integrated 1 0 m ? 100v power switc h ? compatible with energy star, 1w standby requiremen ts ? v dd range from 8v to 24v ? max 400khz switching f r equency ? supports high-side and low-side rectification ? power savi ngs of up to 1.5w in a t y pical notebook adapter appli c ations ? industrial po wer syste m s ? distributed power systems ? battery powered systems ? flyback converters a l l m p s p a r t s a r e l e a d - f r e e a n d a d h e r e t o t h e r o h s d i r e c t i v e . for mp s gr een sta t u s , plea se v isit mps w ebsite under produ cts, quali t y assuran c e page. ?m ps ? an d ? t he f u t u r e of a n a lo g i c tec h n o l o g y ? a r e re gist er ed t r a d e m arks of m o n o l i t hi c pow e r sy stem s, in c. typical application m p 6910 http://
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 2 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* package top marking MP6910dz to220-3 MP6910dz * for rohs compliant pa ckagi ng, add suffix ?lf; (e.g. MP6910dz ?lf) package reference vddvd vs absolute m a xi mum ratings (1) v dd to v s ....................................... -0.3v to +27v v d to v s ....................................... -0.7v to +100v maxi mum operating fre quency............. 400khz continuous drain current (t c =25c) .......... 40a continuous drain current (t c =100c) ........ 15a maxi mum p o wer dis s i pation (2) ................. 2.7w junction te mperature ............................... 150 c lead temperature (solder)....................... 260 c storage temperature .............. -55c to +150 c recommended operation conditions (3) v dd to v s ............................................. 8v to 24v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc to220-3 .................................. 45 ....... 3 .... c/w notes : 1) exceeding these ratings ma y da m age the device. 2) t a =+25 . 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 powe r dissipation at any ambient temp erature is calculated b y p d (max) = (t j (ma x )-t a )/ ja . e x cee d ing the ma ximu m allow a b l e pow e r dissipation w ill cause ex cessive die temp er atur e, and the regulato r w ill go into the r mal shutdo w n . int e rnal therma l shutdo w n circuitr y pr otects the device from permanent damage. 3) the device is not guarant eed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 3 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. electri c al characteristi cs v dd = 12v, t a = +25 c, unless otherw ise noted . parameter sy mbol conditio n s min t y p max units drai n-to -sou rce bre a kdo w n voltage v (br)ds s 100 110 v v dd voltage ran ge 8 24 v v dd uvlo ri sing 5.0 6.0 7.0 v v dd uvlo hystere s i s 0.8 1.2 1.5 v operating cu rre nt i cc f sw =100 khz 4.5 8 ma light-l oad m ode current 260 360 a control circuitry section v ss ?v d forward voltag e v fwd 55 70 85 mv turn -on dela y (5) t don 200 ns turn off thre shol d (v ss -v d ) (5) 30 mv turn -off dela y (5) t doff v d =v ss 30 45 ns minimum on-time (5) t mi n 1.6 s light-lo a d - ent er del a y t ll-dela y 120 s light-lo a d - ent er pulse widt h t ll 2.2 s light-lo a d - ent er pulse widt h hysteresi s t ll-h 0.2 s light-lo ad mo de exit pulse width thre sh old (v ds ) v ll-ds -400 -250 -150 mv power switch section single pulse avalanch e current (6) i as 66 a single pulse avalanch e energy (6) e as 597 mj drai n-so urce on-state re sista n ce r ds(on) v gs =10v, i d =20a 10.2 m ? input cap a cit ance c iss v ds =40v, f=1 m hz 5110 pf output ca pa citan c e c oss 334 pf reverse t r an sfer capa cita nce c rss 150 pf drain-source diode characteristics r e vers e r e cover y time t rr 81 ns diod e reve rse cha nge q rr 190 nc notes : 5) guar anteed b y d e sign and chara c terization. 6) starting t j =25c, l=0.3mh pin functio n s pin # nam e des c ription 1 vdd supply voltage 2 vd fet drain 3 vs fet source, also used as reference for vdd
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 4 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. block diagram logic driver vdd vd vs s co n t r o l ci r c u i t r y figure 1?function block diagram operation the mp691 0 supports operation in dcm an d quasi-resonant flyback converters. the control circuitry con t rols the gate in forward mode an d will turn the gate off when the mosf et current i s fairly low. blanking the control circuitry con t ains a b l an king fun c tio n . when it pulls the integra t e mosfet on/off, it make s sure that the on/off state at least lasts for some time. the turn on blanking time is ~1.6us, which determines the minimu m on-time. du ring the turn on blanking period, the turn off threshold is n o t totally blan ked, but changes t he thresho l d voltage to ~+50mv (i nstead of -30mv). th is assures tha t the part can always be turned off even during the turn on blanking p e riod. (albeit slower) under-voltage lockout (uvlo) when the vdd is below uvlo thres hold, the par t is in sleep mode and the integrate d mosfet i s never turned on. basic operation the basic operations of flyback converter with MP6910 are : z turn on ph ase the switch current will f i rst flow thr ough the body diode of the integrate mosfet, which generates a negative vds acro ss it (<- 500mv). th e voltage is much smaller than the turn on t h reshold of t he control circuitry (- 70mv), whi c h turns o n the integrat e mosfet after 200ns t u rn on delay (defined in fig.2). z conducting phase when the integrated mosfet is turned on, vds becomes to rise according to its on resistance, as soon as vds rises above the turn on threshold (-70mv), the control circuitry stops pulling up the gate driver, which leads the driver voltage of the integrate mosfet dropped to larger the on resistance to ease the rise of vds. by doing that, vds is adjusted to be around -70mv even when the current through the switch is
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 5 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. fairly small, this funct i on can make the internal driver voltage f a irly low when the mosfet is tur ned off to fa st the t u rn o ff speed (this funct i o n is st ill a c tive during turn on blanking pe riod which means the integrate mosfet could still be turned off even with very s m all duty). fig.3 sho w s synchronous rectification operation at heavy load condition. due to the high cu rrent, the in ternal driver voltage will be satu rated at first. after vds goes to above -70 m v, driver voltage decreases to adjust the v d s to typical -70mv. fig.4 sho w s synchronous rectification operation at light load condition. due to the low current, the driver voltage never saturates bu t begins to decrease as soon as the integrate d mosfet is t urned on an d adjust the vds. z turn off ph ase when vds rises to trigger the turn off threshold (- 30mv), the driver volta ge of the switch is pu lled to low after about 20ns turn off delay (d efined in fig.2) by the control circuitry. similar with turn-on phase , a 200ns blanking time is adde d after the switch is turned off to avoid error trigger. light-load latch-off function the gate driver of integr ate mosfet in MP6910 is latched to save the d r iver loss at light-loa d condition to improve efficiency. t he light-loa d- enter pulse width t ll is internal f i xed (~2.2 s) . when synchronous power switch conductin g period keep s lower than t ll for lo nger than the light-load-en ter delay (t ll-delay ), MP6910 enters light-load m ode and la tches off t he integrat e mosfet (fig.5 for detail). during light -load mode, MP6910 monitors th e integrate mosfet body diode conduct i ng period b y sensing v ds (when v ds exceeds the light-loa d mode exit pulse width t h reshold v ll - d s , MP6910 considers t he integrat e mosfet body diode conducting time finishe s ). if the mosfet bod y diode cond uction time is lo nger t han t ll +t ll -h (t ll-h , light-load-enter pulse width h y steresis), t he light-load mode is fin i sh ed and the integrate mosfet of MP6910 is unlatched to restart t h e synchronous rectificatio n (fig.6 for detail). t y pical sy s t em implementations fig.7 shows the typical system i m plementati on for the ic supply derived from o u tput voltage, which is available in low-side rectification and the output volta ge is recommended to be in t he v dd range of MP6910 (from 8v to 24v). if output v o ltage is o u t of the v dd range of MP6910 or high-side r ectificat ion is used, it is recommended to use a n auxiliary winding fro m the power transformer for the ic supply, which is shown in fig.8 and fig. 9. there is another non-auxiliary win d ing solutio n for the ic supply, which uses an external ldo circuit from the secondary transformer windin g . see fig.10 and fig.1 1 , compared with using auxiliary win d ing for ic s upply, this solution has a bit higher p ower loss which is d i ssipate on t he ldo circuit especially when the secondary winding voltage is high. v ds i n t e r n al d r i ver v o l t ag e t do n t dof f -7 0 m v -3 0 m v 2v figure 2?turn on and turn off dela y
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 6 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. -70mv -3 0 m v v ds i sd int e r n a l dr i v e r vo l t ag e t0 t1 t2 figure 3?sy nchronou s rectification operation at heavy load -70mv -3 0 m v v ds i sd in t e r n a l dr i v e r vo l t a g e t0 t1 t2 figure 4 ? sy nchronou s rectification operation a t light load switching current no r m a l m o d e l i ght l o a d m o de t ll 120 s t ll t ll sr g a t e load become light figure 5?enter light load mode sr g a t e switching current li g h t lo a d m o d e n o r m a l m o d e t ll +t ll- h t ll +t ll-h t ll +t ll-h t ll +t ll-h l o ad b e c o m e h e av y figure 6?exit light load mode
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 7 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. 1 3 m p 69 10 c1 c2 vd vdd vs s 2 figure 7?ic suppl y d e rived directl y from o u tput voltage 1 3 MP6910 c2 r1 c1 d1 vd vdd vs s 2 figure 8?ic suppl y d e rived from auxiliary winding in low - sid e rectification r1 c2 c1 d1 vd vs s vd d 2 m p 691 0 1 3 figure 9?ic suppl y d e rived from auxiliary winding in high-side rectification
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 8 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. 1 3 m p 6 910 r1 r2 d1 d2 1 c vd d 2 vs s vd 2 c figure 10?ic suppl y d e rived from secondary w in d ing in l o w - sid e rectification d1 d2 c2 c1 r1 r2 m p 691 0 vs s vd d vd 2 3 1 figure 11?ic suppl y d e rived from secondary w in d ing in high-side rectification
MP6910- f a s t t urn- off intelligent rec t ifier MP6910 rev. 1. 04 www.monolithicpower.com 9 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. package informati o n sid e view top view 0. 50 (1 .27 ) typ ? 0.147 ( 3.73 ) ? 0.155 ( 3.94 ) 0. 230 ( 5. 84) 0. 270 ( 6 . 86) 0. 027 ( 0. 69) 0. 037 ( 0. 94) 0 . 100 ( 2 . 54 ) bs c 0. 014 ( 0. 36) 0. 022 ( 0. 56) 0. 095 ( 2 . 41 ) 0. 115 ( 2. 92 ) 0. 175 ( 4 . 45 ) 0 . 1 85 ( 4 . 7 0) 0.390 (9.91 ) 0 .415 (10 .54 ) 0.520 ( 13 . 21 ) 0. 550 ( 13 . 97 ) 0. 100 ( 2 . 54) 0. 120 ( 3. 05) 0. 330 ( 8 . 38) 0. 355 ( 9. 02) e-pin i d 0. 130 ( 3 . 30) 0. 160 ( 4. 06) 0.560 ( 14. 22 ) 0. 650 ( 16. 51 ) no t e : 1) control di m e ns i o n i s i n i nche s . di m e ns i o n i n b racke t i s i n m i l l i m e t e rs . 2 ) p acka g e l e ng t h do e s no t i ncl ude m o l d f l as h , p ro t rus i o ns o r g at e burrs . 3 ) p acka g e w i d t h d o e s no t i ncl ude i nt e rl e ad f l as h o r p ro t rus i o ns . 4 ) draw i ng co nf o r m s t o j e de c t o - 2 2 0 6 ) draw i ng i s no t t o s cal e . 0. 045 ( 1 . 14 ) 0. 055 ( 1. 40 )
MP6910- f a s t t urn- off intelligent rec t ifier not i ce: t he i n formatio n in this docum ent i s subject to chang e w i t h o u t notice. users sh oul d w a rra nt and gu arante e that third part y int e ll ectu al prop ert y r i g h ts are n o t inf r ing ed u p o n w hen i n tegr atin g mps product s into an y ap p licatio n. mps w i ll not assume a n y le gal res pons ib ili t y for an y sai d app licati ons. MP6910 rev. 1. 04 www.monolithicpower.com 10 1/3/2013 mps proprietar y information. pate nt protec ted. un authorized photo c op y and d uplication prohibited. ? 2013 mps. all rights reserved. sid e vie w top view 0. 50 (1 .27 ) typ ? 0.14 2 (3.60 ) ? 0.15 0 (3.80 ) 0. 2 30 ( 5. 84 ) 0. 2 70 ( 6. 86 ) 0. 0 27 ( 0 . 69) 0. 0 37 ( 0 . 94) 0 .100 ( 2 . 54 ) bs c 0. 015 ( 0. 39) 0. 02 4 ( 0. 61) 0.095 ( 2 . 41 ) 0. 1 15 ( 2. 92 ) 0. 175 ( 4 . 45 ) 0. 18 5 ( 4 . 70 ) 0.39 2 ( 9.9 6) 0.408 (10.36) 0.52 8 (13 .40 ) 0 . 56 7 ( 1 4. 4 0 ) 0. 100 ( 2. 54) 0 . 120 ( 3. 05) 0 . 330 ( 8. 38) 0 . 355 ( 9 . 02) e-pin id 0. 130 ( 3. 30) 0 . 160 ( 4. 06) 0. 560 ( 1 4 . 22 ) 0. 650 ( 16 . 51 ) no t e : 1 ) co ntrol di m e ns i o n i s i n i nche s . di m e ns i o n i n brack e t i s i n m i l l i m e t e r s . 2 ) p acka g e l e ng t h d o e s no t i ncl u de m o l d f l as h , p ro t rus i o ns o r g at e burr s . 3 ) p acka g e w i dt h d o e s no t i ncl ude i nt e rl e ad f l as h o r p ro t rus i o ns . 4 ) dra w i ng co nf o r m s t o j e d e c t o - 2 2 0 6 ) dra w i ng i s no t t o s c al e . 0. 0 45 ( 1. 14 ) 0. 0 55 ( 1. 40 )
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