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19-5981; rev 1; 1/12 ?? ???????china.maxim-ic. com/max17497a.related max17497a/max17497b?????pwm ??????? ???????? ???max17497a /???(uvlo)????(85v ac265v ac) ?max17497b? ? ? (uvlo) ???dc-dc???3.3v? ?????600ma max17497a????250khzmax17497b /boost????500khz? ???1mhz????? ?????????? ?????en/uvlo?? ???/??ovi? ??????? ? ?????fet?? max17497b?93%????? ????max17497a?49% ????????? ?resetn??? /boost??3.3v?????? ???ssf/boost? ??3.3v??? ???????? ????y?? 16(3mm 3mm) tqfn???0.5mm s ??? ? ??/boost???? ? ? ??16(3mm??3mm) ? tqfn? s ? ??250khz??? ? s ? ? ??/boost ? ???? s ???? ? ? ? ???? s ? ? ??/boost ? ? s ? ? /boost???? s ? 150m 65v??nmosfet?80% ?? ? 3.3v???90% s ??? ? ?ac-dc? ???ac-dc? ???/boost?? available evaluation kit available ?????????????? ? ????? maxi m? 1080 0 85 2 124 9 () 1080 0 15 2 124 9 ( ) maxi m?china.maximintegrated.com max17497a/max17497b ac-dcdc-dc???? ???
in to sgnd ............................................................ -0.3v to +40v en/uvlo to sgnd ....................................... -0.3v to v in + 0.3v ovi to sgnd ............................................... -0.3v to v cc + 0.3v v cc to sgnd .......................................................... -0.3v to +6v ssf, rlimf, eafn, compf, scompf to sgnd ............................................... -0.3v to (v cc + 0.3v) lxf to sgnd ......................................................... -0.3v to +70v inb to sgnd ......................................................... -0.3v to +26v lxb to sgnd .............................................. -0.3v to v inb + 0.3v outb to sgnd ....................................................... -0.3v to +6v resetn to sgnd .................................................... -0.3v to +6v pgndf, pgndb to sgnd ................................... -0.3v to +0.3v continuous power dissipation (single-layer board) tqfn (derate 20.8mw/nc above +70nc) (note 1) ... 1700mw operating temperature range ........................ -40nc to +125nc storage temperature range ............................ -65nc to +160nc junction temperature (continuous) ................................ +150nc lead temperature (soldering, 10s) ................................ +300nc soldering temperature (reflow) ...................................... +260nc absolute m a xi m u m r a tings n ote 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to china.maxim-ic.com/thermal-tutorial. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. e lect r ic a l c h ara cte r istics (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) (note 2) param ete r con d itions m in t yp ma x units in p ut su pp l y (v in ) in voltage range (v in ) max17497a 4.5 29 v max17497b 4.5 36 in supply startup current under uvlo i instartup , v in < uvlo or en/uvlo = sgnd 22 36 fa in supply current (i in ) switching, f sw = 250khz (max17497a) 2.75 4.5 ma switching, f sw = 500khz (max17497b) 3 5 in boostrap uvlo rising threshold max17497a 19 20.5 22 v max17497b 3.9 4.15 4.4 in bootstrap uvlo falling 3.65 3.95 4.25 v en/uvlo threshold rising 1.18 1.23 1.28 v falling 1.11 1.17 1.21 en/uvlo input leakage current 0v < v en/uvlo < 1.5v, t a = +25nc -100 0 +100 na l d o v cc output voltage range 6v < v in < 29v, 0ma < i vcc < 50ma 4.8 5 5.2 v v cc dropout voltage v in = 4.5v, i vcc = 20ma 160 300 mv v cc current limit v cc = 0v, v in = 6v 50 100 ma o v e rv olt a ge pr otection ovi threshold rising 1.18 1.23 1.28 v falling 1.11 1.17 1.21 ovi masking delay 2 fs ovi input leakage current 0v < v ovi < 1.5v, t a = +25nc -100 0 +100 na max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 2
elect r ic a l ch ara cte r istics (continued) (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) (note 2) param ete r con d itions m in t yp ma x units f l y b a c k/ boost con v e r te r flyback/boost switching frequency max17497a 235 250 265 khz max17497b 470 500 530 flyback/boost maximum duty cycle f sw = 250khz (max17497a) 47.5 48.75 50 % f sw = 500khz (max17497b) 88 92 96 ssf pullup current v ssf = 400mv 9 10 11 fa ssf set point voltage 1.18 1.23 1.28 v ssf peak current-limit enable threshold 1.11 1.17 1.21 v eafn input bias current 0v < v eafn < 1.5v, t a = +25nc -100 +100 na error-amplifier open-loop voltage gain 90 db error-amplifier transconductance v compf = 2v, v rlimf = 1v 1.5 1.8 2.1 ms error-amplifier source current v compf = 2v, v eafn = 1v 80 120 210 fa error-amplifier sink current v compf = 2v, v eafn = 1.5v 80 120 210 fa current-sense transresistance 0.45 0.5 0.55 i in clamp voltage en/uvlo = sgnd, i in_ = 1ma (max17497a) (note 3) 31 33.5 36 v lxf dmos switch on-resistance (r dson_lxf ) i lxf = 200ma 175 380 m i lxf dmos peak current limit rlimf = 100k 1.62 1.9 2.23 a lxf dmos runaway current limit rlimf = 100k 1.9 2.3 2.6 a lxf leakage current v lxf = 65v, t a = +25nc 0.1 2 fa peak switch current limit with rlimf open 0.35 0.45 0.54 a runaway switch current limit with rlimf open 0.39 0.5 0.6 a rlimf reference current 9 10 11 fa number of flyback/boost peak current-limit hits before hiccup timeout 8 # number of flyback/boost runaway current-limit hits before hiccup timeout 1 # max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 3
elect r ic a l ch ara cte r istics (continued) (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) (note 2) param ete r con d itions m in t yp ma x units flyback/boost overcurrent hiccup timeout 32 ms minimum on-time 110 ns scompf pullup current 9 10 11 fa slope-compensation resistor range max17497b 30 200 k i default slope-compensation ramp scompf = open 100 mv/fs ste p-d o w n r egul a to r inb voltage range 7 16 v inb quiescent supply current v inb = 16v, v outb > 3.3v 200 300 fa inb uvlo threshold rising 6.2 6.5 6.7 v falling 5.9 6.2 6.4 high-side r dson i lxb =200ma 425 800 m i low-side r dson i lxb =200ma 225 425 m i switching frequency 0.94 1 1.06 mhz lxb leakage current v lxb = v inb - 1v, v lxb = v pgndb + 1v, t a = +25nc 0.1 1 fa lxb dead time (note 4) 5 ns v outb output-voltage accuracy 7v < v inb <16v, 50ma < i out < 600ma 3.245 3.3 3.355 v v outb input bias current v outb = 3.3v 7 10 fa peak current-limit fault threshold v outb = 3.1v 0.9 1.1 1.23 a runaway current-limit threshold v outb < 100mv 1.05 1.25 1.45 a soft-start duration count v inb > 7v 2048 cycles number of peak current-limit hits before hiccup timeout 8 hits number of runaway current-limit hits before hiccup timeout 1 hits overcurrent hiccup timeout 32,768 cycles minimum on-time 100 ns r esetn resetn output leakage current (off-state) v resetn = 5v, t a = +25nc -1 +1 fa resetn output voltage (on-state) i resetn = 10ma 0 0.4 v resetn higher thresholds eafn rising 93.5 95 96.5 % outb rising 93.5 95 96.5 max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 4
n ote 2: all devices are 100% production tested at t a = +25nc. limits over temperature are guaranteed by design. n ote 3: the max17497a is intended for use in universal input power supplies. the internal clamp circuit at in is used to prevent the bootstrap capacitor from charging to a voltage beyond the absolute maximum rating of the device when en/uvlo is low (shutdown mode). externally limit the current to in (hence to clamp) to 2ma (max) when en/uvlo is low. n ote 4: guarantees cross conduction is avoided and it is not larger than specified max value to guarantee loop-regulation capability. elect r ic a l ch ara cte r istics (continued) (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) (note 2) ? (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) param ete r con d itions m in t yp ma x units resetn lower thresholds eafn falling 90.5 92 93.5 % outb falling 90.5 92 93.5 resetn delay after eafn and v outb reach 95% regulation (max17497a/max17497b) 4 ms the rma l shut d o w n thermal shutdown threshold temperature rising 160 nc thermal shutdown hysteresis 20 nc bootstrap uvlo wake-up level vs. temperature (max17497a) max17497a/b toc01 temperature (c) bootstrap uvlo wake-up level 100806040200-20 20.16 20.18 20.20 20.22 20.24 20.26 20.14 -40 120 in uvlo wake-up level vs. temperature (max17497b) max17497a/b toc02 temperature (c) in uvlo wake-up level (v) 100806040200-20 4.15 -40 120 3.95 4.00 4.05 4.10 3.90 in uvlo shutdown level vs. temperature (max17497a /max17497b) max17497a/b toc03 temperature (c) in uvlo shutdown level (v) 100806040200-20 4.015 -40 120 3.975 3.980 3.985 3.990 3.995 4.000 4.005 4.010 max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 5
?() (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) en/uvlo rising level vs. temperature (max17497a/max17497b) max17497a/b toc04 temperature (c) en/uvlo rising level (v) 100806040200-20 1.235 -40 120 1.215 1.220 1.225 1.230 1.210 ovi rising level vs. temperature (max17497a /max17497b) max17497a/b toc06 temperature (c) ovi rising level (v) 100806040200-20 1.225 1.210 -40 120 1.215 1.220 in current under uvlo vs. temperature (max17497a/max17497b) max17497a/b toc08 temperature (c) in current under uvlo (a) 100806040200-20 30 -40 120 22 24 26 28 20 en/uvlo falling level vs. temperature (max17497a/max17497b) max17497a/b toc05 temperature (c) en/uvlo falling level (v) 100806040200-20 1.145 1.150 1.155 1.160 1.165 1.170 1.140 -40 120 ovi falling level vs. temperature (max17497a/max17497b) max17497a/b toc07 temperature (c) ovi falling level (v) 100806040200-20 1.160 -40 120 1.140 1.145 1.150 1.155 1.135 in current during switching vs. temperature max17497a/b toc09 temperature (c) 100806040200-20 2.6 2.8 3.0 3.2 3.4 3.6 2.4 -40 120 in current during switching (ma) max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 6
?() (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) lxf and primary current waveform max17497a/b toc10 2s /div v lxf 100v/div i pri 1a/div max17497a/b toc12 4ms /div enable shutdown waveform (full load) v dc 200v/div v outf 10v/div v outb 2v/div en/uvlo 5v/div peak current limit (ilimf) vs. rlimf at room temperature max17497a/b toc14 rlimf at room temperature (k i ) peak current limit (ilimf) (ma) 70 60 40 50 20 30 10 200 400 600 800 1000 1200 1400 1600 1800 0 08 0 enable startup waveform (full load) max17497a/b toc11 4ms /div v dc 200v/div v outf 10v/div v outb 2v/div en/uvlo 5v/div resetn waveform max17497a/b toc13 2ms /div v resetn 5v/div v outf 5v/div v outb 2v/div peak-current limit at rlimf = 100ki vs. temperature max17497a/b toc15 temperature (c) 100806040200-20 1.95 1.96 1.97 1.98 1.99 2.00 1.94 -40 120 peak-current limit (a) max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 7
?() (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) transient response (flyback) max17497a/b toc16 1ms /div v outf (ac) 200mv/div i load 0.5a /div bode plot (flyback regulator) max17497a/b toc18 0dbm 67 89 12 34 56 78 91 23 4 gain 10db/div phase 36/div bw = 6.9khz pm = 55 v outb vs. temperature max17497a/b toc20 temperature (c) v outb voltage (v) 0-20-40 80604020 3.26 3.27 3.28 3.29 3.30 3.31 3.32 3.33 3.34 hiccup overcurrent protection (flyback regulator) max17497a/b toc17 10ms /div v dc 50v/div v outf 5v/div i pri 0.5a/div inb wake-up level vs. temperature max17497a/b toc19 temperature (c) 100806040200-20 6.48 6.41 -40 120 inb wake-up level (a) 6.42 6.43 6.44 6.45 6.46 6.47 v outb vs. inb voltage max17497a/b toc21 inb voltage (v) v outb voltage (v) 8 61 6141210 3.31 0 3.313 3.316 3.319 3.322 3.325 3.328 max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 8
?() (v in = +15v, v en/uvlo = +2v, compf = open, c in = 1ff, c vcc = 1ff, t a = t j = -40nc to +125nc, unless otherwise noted. typical values are at t a = +25nc.) lxb and inductor waveform max17497a/b toc22 400ns /div i lxb 0.5a/div v lxb 5v/div load step on buck regulator max17497a/b toc24 1ms /div v outb 50mv/div i load 0.2a /div efficiency graph vs. load current (flyback regulator) max17497a/b toc26 load current (a) e ffi ci en cy (% ) 0 10 20 30 40 50 60 70 80 90 100 00 .2 0. 40 .6 0. 81 .0 1. 21 .4 v dc = 310v v outb vs. load current max17497a/b toc23 load current, i outb (a) v outb voltage (v) 3.31 0 3.315 3.32 0 3.325 3.33 00 .1 0. 20 .3 0. 40 .5 0. 6 bode plot (buck regulator) max17497a/b toc25 0dbm 67 89 12 34 56 78 91 23 4 gain 10db/div phase 36/div bw = 110khz pm = 57 efficiency vs. load current (buck regulator) load current (a) efficiency (%) 0.50.40.30.20.1 10 20 30 40 50 60 70 80 90 100 0 0 0.6 max17497a/b toc27 v inb = 15v max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 9
? 1 en/uvlo ?/???1.23v???uvlo??en/ uvlosgnd??? 2 v cc ?v cc sgnd?1 f?ic 3 ovi ????(ovi)sgnd????? 4 rlimf ?rlimfsgnd??k??????? ???500ma 5 scompf ??scompfsgnd??k?v cc ??? /boost??(scompf) ? 6 eafn ????/??/boost?sgnd? ?? 7 compf /boost??compfsgnd????9 15 16 14 13 6 5 7 v cc rlimf 8 en/uvlo lxb outb inb 12 pgndf 4 12 11 9 lxf ep in ssf compf eafn scompf + ovi pgndb 3 10 resetn tqfn top view max17497a max17497b max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 10
?() ?? max17497a??????? ??30w?????3.3v 600ma?????3.3v ???????? ??????? ?????????? ??max17497b ??4.5v??dc-dc????? /boost?(??15w)3.3v600ma? ????1 ? max17497a in?uvlo?max17497b? max17497a????? ac-dc ? ?max17497a ac-dc ????????? ???????????? max17497a?max17497a? ?max17497a???(85v265v ac) ??3????? (36v72v dc)? 8 ssf /boost??ssfsgnd????? 9 outb ??outb???? 10 pgndb ????? 11 lxb ???????? 12 inb ??????inbv outf (/boost?)?? ?2.2f???inbpgndb 13 resetn ???5%?resetn???????92% ?resetn??? 14 pgndf /boost???? 15 lxf /boost???/?? 16 in ???in??1f???inpgndf ep ???sgndep?sgnd???????? ep (sgnd)pgndf max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 11
max17497b????60vnmosfet ?/boost?max17497bin ??36vmax17497b in??? ??dc-dc??4.5v? max17497b?4.5v36v?/boost? ???? ????????? 16v (?) ?(v cc ) ? ??in??? v cc 1 f??????v cc ???in?? ?29v (max17497a)36v (max17497b) ??(lxf) ? ?nmosfet??/boost? ???????max17497a ???nmosfet??mosfet ??mosfet?in??? in???mosfet?? ??mosfet????nmosfet? ??nmosfet?mosfet?? max17497b?lxf???? boost? ?? ? max17497a ? ?49%max17497b ???93%?/???1 dc-dcboost????? ???85%??? resetn?? resetn?????????resetn ?????resetn?? ?/boost??? ??95% (?)?rese tn?? ????92% (?)?rese tn? ? max17497a????? ??????uvlo ?6.5v???3.3v ? ?2 ??max17497a?? max17497b?boost??? ????????? ????7v16v?? en/uvlo??1.23v (?)inb?? 7v??? ??/boost?????? ssf??/boost? ????? ????2ms?ssf ?? /boost?(ssf) ? max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 12
?1. max17497a/max17497b?? ldo pok 5v, 50ma v cc en /uvlo in ovi rlimf scomf eafn comf chipen 1.23v 1.23v 1.23v 1.23v 1.23v v outb pgndb lxb inb restein pgndf lxf ssf 1.17v inb pok chipen en_buck comp 250mv rlimfint chipen v ss fix_slope v scompf slope compensation 10a 10a 33v clamp (max17497a only) osc v cs clk control logic and driver 8 peak or 1 runaway control logic and driver runaway hiccup v sum 10a chipen hiccup v cs v scompf peak pwk runaway hiccup v csb 8 peak or 1 runaway 1.23v 1v v csbsum v csbsum inb chipen v outb eafn v csb ssdonef ssdonef i slope ssdoneb peak pwm clk clk v sum compf ref 1.23v max17497a max17497b ssdoneb step-down soft-start max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 13
?? ? emi???????? 10%??????1/16 ?????? ??emi? ?? ??? (en/uvloovi) ? en/uvlo??/??? uvlo?en/uvlo??1.23v (?) ?en/uvlo???1.17v (?)????? ???(v dc )??en/ uvlo???k????? ????en/uvlo??1.23v ( ?)?en/uv lo???(r ovi ) ????? ?3 ?ovi ??1.23v (?)????? ovi ???1.17v (?)? ?? ???(v start )? (v ovi )??kr ovi ? 24.9k : ovi en ovi start v r r 1k v ?? = ?? ?? ?? ?r ovi ?k v start v ovi ?v start sum ovi en v r r r 1k 1.23 ?? = + ?? ?? ?? ?? ?? ?r en r ovi ?k v start ?vr sum ???(r dc1 r dc2 r dc3 )?? ????? r r r k = = = ? sum dc1 dc2 dc3 r 3 ?2. max17497a/max17497b? en/uvlo 6.5v t ssf t ssb resetn t resetn 4ms 95% 92% v outb v outf 95% max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 14
?3. en/uvloovi ?4. rcmax17497a max17497a?????? ???rc???? (r start )(c start )?in? ?in uvlo??(20v?)? ?max17497a? r start 20 a (?)?? in??i nuvlo?max17497a ???lxf??nmosfet ?nmosfet (q1)?? max17497ac start 2.5ma?r start ????c start ???? ?4 ???nmosfetlxf? ???(v outf )? (d2) in ?c start ???5v?? v outf 6vd2? ? ? in ? v outf ? ? max17497a v outf ? max17497a??(??15v)? (c start )(??20 a)? ?(r start )????? ?r start ???(r in1 r in2 r in3 ) ??????????? ?????? ??r start c start : gate sw ssf start in 6 q ft c i f 10 10 ?? ?? = + ?? ?? ?? ?? ?i in ?in???maq gate ??mosfet???ncf sw ?? ???hzt ssf ????? ?ms ( /boost?(ssf) ) ( ) start start start v 10 50 rk 1c ? = ? + ?? ?? ?c start ??? f ??????? ???k? ?5 ? ovi r ovi r en r sum r dc3 r dc2 r dc1 v dc en/uvlo max17497a max17497b r start r in3 v outf d2 v dc in lxf v cc c vcc c start r in2 r in1 max17497a ldo v dc v outf d1 c outf max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 15
(c start ): gate sw ssf start in 6 q ft c i f 10 10 ?? ?? = + ?? ?? ?? ?? ?i in ?in???maq gate ? ?mosfet???ncf sw ??? ??hzt ssf ????? ?ms r start r isrc : start start beq1 isrc v rm 10 v rm 70 = ? = ? max17497bin uvlo?3.9v??200mv ?4.5v??dc-dc??? ???(4.5v5.5v?) max17497b??in??? (?6 )???(16v32v?) ??( ?7 ) (q1)?????nb(r z ) : z inmin r 9 (v 6.3) k = ?? ?v inmin ??? /boost?(ssf) ??ssfgnd??/boost? ?(c ssf ): ssf ssf c 8.13 t nf = ?t ssf ms? ?5. ??max17497a ?6. max17497bin?? r start r in3 m 1 in q1 r isrc v outf v dc v dc v outf d1 in lxf pgndf v cc c vcc c start d2 r in2 r in1 c outf max17497a ldo v dc v outf in lxf np ns v cc d1 in c in c outf c vcc max17497b ldo max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 16
/boost??(eafn) ????/boost??? ?(v outf )?eafn (?8)r b 20k 50k ?r u ?: outf ub v r r 1k 1.23 ?? = ?? ?? ?? ?r b ??k /boost??(rlimf) ????? ?/boost????? ??lxf??rlimf? ????? ??(???/boost? ???) 8??1??? ??????(t rstart )?? ???????? ????/boost? ?????(i pk )?? r limf : limf pk r 50 i k =? ?i pk ?? ????????20% ???????? ?????? /boost??(scompf) max17497a???49% ????? 50%?????? max17497a????? max17497a????rlimf v cc ?????? ??????? ?7. max17497b???q1? ?8. /boost?? v dc v outf lxf np ns d2 d1 in c outf max17497b in nb v cc c vcc c in r z z d1 6.3v ldo q1 r b r u eafn v outf max17497a max17497b max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 17
max17497a/boost????? ?????? ????/boost??? ?????? 50%??????? 50%??????? ?????scompf ???scompf?r scompf ?: scompf e r 0.1s k = ? ?(s e )??? ??? ? ??????? ????800ma? ??????pmosfet?? ?(?????? ?)????1a (?)?? ?8?? 1?????? ???(t rstartb )????? ??????? ??? /boost??? ?? ? ?/boost????? ????? ????????? ?????? ??9????? /boost??????: ? ?????(dcm) ? ?????(ccm) ? boost???(dcm boost) ? boost???(ccm boost) ????(r z c z c p )? ???? dcm? ? ??? dcm???? ??????? ???????: ( ) ( ) 2 inmin max primax outf d outf sw v d 0.4 l v vi f + ? d max max17497a?0.35 max17497b ?0.7v d ???f sw ?? ????l primax ?? ?9. /boost?? r z compf c z c p max17497a max17497b max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 18
?? ????l pri ???(d new ) ?: ( ) pri outf d outf sw new inmin 2.5 l v v i f d v + = (ns/np) ?(k = ns/np): ( ) outf d max inmin max v v (1 d ) k vd + ? = ?/rms ???????rms? ??????? ??????rms: ??: inmin new pripeak pri sw vd i lf = ?rms: new prirms pripeak d ii 3 = rms: pripeak secpeak i i k = ?: ( ) secpeak pri sw secrms pripeak outf d i lf ii 3v v = ??? ??? ?nmosfet?????? ??nmosfet???????? ??(??) ?^?? nmosfet???????? : 22 lk pripeak snub 2 outf 2l i k c v = ?l lk ????(???? 1%2%) ???: 2 snub lk pripeak sw p 0.833 l i f = ?: 2 outf snub 2 snub 6.25 v r pk = ?????: outf dsnub inmax v v v 2.5 k ?? = + ?? ?? ? x7r??????????? ?????50%? ???????3%?? ?: step response outf outf it c v = ? response c sw 0.33 1 t () ff ?+ ?i step ???t response ???? v outf ????f c ??? ???f c ??(f sw )1/10?? ?????? limf pripeak i i 1.2 = max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 19
???????? ?: 2 new pripeak outf coutf pripeak sw outf d i ki v 2i f c ?? ? ?? ?? ?? ?= ?i outf ??d new ????? ? max17497a??ac-dc??? ??????? ???????? ???????max17497b ???dc-dc?????? ??????? ??rms ???(max17497b) dc-dc? ??x7r????? ???????esresl??? ????????? ????- ??(v in_rip ): ( ) 2 new pripeak new in sw in_rip d i 1 0.5 d c 2f v ?? ? ?? = ????(max17497a) ???? ????(v in_rip )?? : pripeak new in ripple in_rip 0.5 i d c fv = ?f ripple ??????? ????????? ???(max17497a) ?? (t holdup )???(p holdup ) ??????(v infail )??? ???(v inmin )??(c in ): ( ) holdup holdup in 22 infail inmin 3p t c vv = ? rms 2 inmin max incrms sw pri 0.6 v d i fl = ??mosfet ? ?mosfet??????/rms ??? ?mosfet????????? ??????mosfet?v ds ????: outf d dsmax inmax vv v v 2.5 k ?? + ?? =+ ?? ?? ?? ?? ??mosfet????? ?? ???? ???? ???????? ????????? ?????? secdiode inmax outf v 1.25 (k v v ) = + ???????????(? ??)???? ???????2 x i outf 3 x i outf ???50ns??? ??? max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 20
? ?: 2 sw outf outf p z pri sw 0 . 1f 1 vi f r 450 2l f ?? ?? ?? + ?? ?? ?? ?? = outf p outf outf i f vc = z zp p z sw 1 c rf 1 c rf = = ??(f sw )? ?????? ?????? ?????? ccm? ?(k ? = ? ns/np) ??: ( ) out d max inmin max v v (1 d ) k vd + ? = ?d max ???(max17497a?0.35 max17497b?0.7) ?? ???: ( ) outf d nom pri outf sw v v (1 d ) k l 2i f + ? = ? ?d nom ???(v innom )???? ?: ( ) ( ) out d nom innom out d v vk d v v vk + = ?? + + ?? ?????? ?? ccm???? ?0.15 ?????15% ?ccm???????? ????? ?()????ccm? ???v d ?? ?? ?rms ???????rms? ??????? ??????rms: ??: outf inmin max pripeak max pri sw ik vd i 1d 2l f ?? ?? = + ?? ?? ? ?? ?? ?rms: ( ) 22 pripeak pri pripeak pri prirms max i ii i i 3 d +? ? ? = ?i pri ?????: inmin max pri pri sw vd i lf ?? ?= ?? ?? ?: pripeak secpeak i i k = rms: max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 21
( ) 22 secpeak sec secpeak sec secrms max i ii i i 3 1d +? + ? = ? ?i sec ????: inmin max sec pri sw vd i l fk ?? ?= ?? ?? ??: limf pripeak i i 1.2 = ??rcd ?rcd? dcm? ??? ? x7r?????????? ?????50% ????????3% ??: step response outf outf it c v = ? response c sw 0.33 1 t () ff ?+ ? i step ? ?t response ???? v outf ????f c ??? ???f c ?()rhp? (f rhp )1/5????: 2 max outf zrhp 2 max pri outf (1 d ) v f 2d li k ? = ccm????? ????????? ???: outf max coutf sw outf id v fc ?= ? ??? dcm? ??? ??mosfet ? ??mosfet? dcm? ?? ? ???? ?????? dcm? ??? ? ? ccm?????? ??: 2 max outf zrhp 2 max pri outf (1 d ) v f 2d li k ? = ?: 2 outf rhp z max p 225 i f r1 (1 d ) 5 f ?? = + ?? ? ?? ?f p ???????: max outf p outf outf (1 d ) i f 2c v + = ???(f c ?1) ????1/5 zrhp c f f 5 ????: z zp 1 c 2r f = ????1/2: p z sw 1 c rf = max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 22
dcm ? boost? dcm boost??? ?????? ??? ? ???boost??? ????dcm??? dcm?: ( ) 2 outf inmin inmin in 2 outf outf sw v v v 0.4 l iv f ?? ? ?? ?? ?v inmin ?? ?/rms ?????: limf pk i i 1.2 = ?i pk ?: outf inmin outf pk inmin swmin 2 (v v ) i i lf ?? ? = ?? ?? l inmin ??????f swmin ?max17497b?? ? x7r?????????? ?????50% ????????3% ??: step response out outf it c v = ? response c sw 0.33 1 t () ff ?+ ?i step ???t response ???? v outf ????f c ??? ???f c ??(f sw )1/10boost ?????? ????????? ?: outf in pk coutf inmin outf i li v vc ?= ? ????? ????rms??: outf inf inmin swmin max 3.75 i c v f (1 d ) ?? = ?? ? ?? ?rms: pk cin_rms i i 23 = ? ????: ( ) dc m z dc sw g g 10 c g 10 nf 2f = = ?g dc ????: 2 outf inmin sw outf in dc 2 outf inmin outf 8 (v v ) f v l g (2v v ) i ? = ? outf outf outf inmin z outf z outf inmin v c (v v ) r i c (2v v ) ? = ? ?v inmin ???i outf ??: outf p z c esr c r = max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 23
? ?dcm boost???? ????? ????scompf v cc ?? ? boost????? boost???? ????????(???) ?^?????? ????????? ?1.3 x v outf ? ?????????( ????)?????? ????????? ?2 x i outf 3 x i outf ????50ns ?????? ?mosfet ? rms ?mosfet (?lxf)??? ????? ????? ?? ^?nmosfet???65v?? ?48vboost??? ?lxfrms??nmosfet ???: 3 pk ins sw lxf_rms inmin i lf i 3v = ?i pk ??(v inmin )???? ccm ? boost? ? ccm boost???? ?max17497b?? ??boost? ????(?-?1/2) ?dcm ? ??boost?? ???30%: in in outf sw v d (1 d) l 0.3 i f ? = ?d????: outf d in outf d ds outf v vv d v v (r i ) +? = +? v d ??boost??? r ds ?lxf?nmosfet?? ?/rms ????nmosfet?? : outf max max outf pk inmin swmin max v d (1 d ) i i 1.2 l f (1 d) for d 0.5 ?? ? = + ?? ? ?? < outf outf pk max inmin swmin 0.25 v i i 1.2 for d 0.5 l f (1 d) ?? = + ?? ? ?? d max ??????(v inmin ) ?????l inmin ??? ???f swmin ?max17497b? ? max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 24
? x7r??????????? ?????50%? ???????3%?? ?: step response outf outf it c v = ? response c sw 0.33 1 t () ff ?+ ? i step ???t response ???? v outf ????f c ??? ???f c ??(f sw )1/10boost ?????? ????????? ?: outf max coutf outf sw id v cf ?= ? ??????? ????rms??: outf inf inmin sw max 3.75 i c v f (1 d ) ?? = ?? ? ?? ?rms: lin cin_rms i i 23 ? = ?: outf max max lin max inmin swmin v d (1 d ) i for d 0.5 lf ?? ? ?= < ?? ?? outf lin max inmin swmin 0.25 v i for d 0.5 lf ?? ?= ?? ?? ? ?: 2 outf outf min z outf_min in 250 v c (1 d ) r il ? = ?d min ?????i outf_min ? ?: outf outf z outf z vc c 2i r = p sw z 1 c fr = ? ???50%??????? ??: outf inmin e in 0.5 (0.82 v v ) s v per s l ? = ?l in ?? h ? ??? dcm boost? ??? ?mosfet ? rms ?mosfet (?lxf)??? ????? ???????? ^?nmosfet???65v?? ?48vboost??? ?lxfrms??nmosfet ???: outf max lxf_rms max id i (1 d ) = ? ?d max ?????i outf ? max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 25
?? ? ???????+125 ???? in in in p vi = ?v in ?in???i in ?? ?????????nmosfet? ???: ( ) 2 conduction lxf_rms dson_lxf transition inmax pk r f sw p ir p 0.5 v i t t f = = + ?t r t f ?ccm??nmosfet? ??dcm?????0? t f ????: transition inmax pk f sw p 0.5 v i t f = ?mosfet???????0?mosfet ?????????? ?????: 2 cap ds dsmax sw p 0.5 c v f = ???????? : ( ) 2 lossbuck outb dc out 1 p p ( 1) i r = ?? ? ?????(i outb )? ?r dc ?? ??: loss in conduction transition cap lossbuck p pp p p p =+ ++ + +70????1666mw? +70????21mw/ ????: ja 48 c/ w = jc 10 c/ w = ????(t a_max )?: ( ) j_max a_max ja loss tt p = + ???????? ????(t ep_max )? ??: ( ) j_max ep_max jc loss tt p = + max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 26
?10. max17497a?(?) c13 10f/25v inb r22 10ki v cc resetn resetn c17 10f/6.3v pgndb lxb v out3 3.3v, 0.6a l2 15h pgndf in in ep rlimf ssf r11 30ki c12 47nf v cc scompf v cc c4 2.2nf eafn vout1 r17 49.9ki r19 10ki r18 559ki r5 82ki r6 20.5ki en/uvlo ovi r4 2.2mi r3 2.2mi r2 2.2mi v in r15 3mi r14 3mi 3mi r12 3mi in c6 0.47f /35v r23 10ki n2 fqt1n80tf c7 2.2f/50v v out1 q1 bc849cw d2 rb160m-60tr v in r10 1.2mi c3 100f/ 400v c2 100f/ 400v l1 1mh r9 1.2mi r8 1.2mi c1 0.1f/ 1kv d1 sskc-13-f line neutral 85v ac to 265v ac r7 1.2mi r1 10i outb v out3 v out1 lxf d4 ss1200-ltp d3 us1k-tp d5 bzt52c18-7f n1 fqd1n80tm c8 0.1f/25v c18 10f/ 25v ss1200-ltp d6 c14 22f/ 25v c15 22f/ 25v c10 2.2nf/ 250v r16 100ki/0.5w r20 10i t1 c16 open v out1 in v out2 v out1 15v, 0.5a v out2 6v, 0.15a pgnd max17497a compf c11 47pf c9 22nf max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 27
?11. max17497b? max17497b in v out1 r8 49.9ki v cc c9 10f/6.3v r9 10ki c8 10f/25v v cc scompf eafn compf outb pgndb lxb inb resetn resetn v out2 3.3v, 0.6a l2 15h pgndf in l1 15h d1 ss26-tp c7 4.7f/35v v out1 24v, 0.2a lxf in v cc ovi ep r7 25ki r6 481ki r5 15ki r2 12ki r4 184ki r3 9.92ki c5 10nf c4 2.2f c2 0.1f c1 47f in v in pgnd 10.8v to 13.2v dc in rlimf ssf r1 75ki c3 47nf c6 47pf en/uvlo max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 28
??? ????? ??????di/dt ????? ??? ?emi??mosfet?dv/dt ???mosfet?? ???????? ???????????? ????????? ?pcb??????? ?????? ????????max17497a J???? china.maxim-ic.com ?y?????Z? ???ulvde?? ? ?? ?????(?)? china.maxim-ic.com/packages ????+#- ?rohs?????????????rohs???? + ??(pb)/rohs??? par t te mp ra nge p in -pa c ka ge d esc r i p tion ma x 17497a ate+ -40nc to +125nc 16 tqfn 250khz, offline flyback/forward converter with 3.3v, 600ma synchronous step-down converter ma x 17497 b ate+ -40 nc to +125nc 16 tqfn 500khz, flyback/boost converter with 3.3v, 600ma synchronous step-down converter ? ? ?? 16 tqfn t1633+5 21-0136 90-0032 max17497a/max17497b ac-dcdc-dc???? ??? maxim integrated 29
?? ? ? ? ?? 0 11/11 1 1/12 ?max17497b?? 29 max17497a/max17497b ac-dcdc-dc???? ??? ma xim ma xim ??????? ? max im ????????? ? ???(??)?????? maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 ? 2012 maxim integrated maxim?maxim integratedmaxim integrated products, inc.?? maxim 8328 100083 ?800 810 0310 010-6211 5199 010-6211 5299

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