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sw 265 8a a??????? pw m 1|aa??? ???? ?? ??????o 4ms ?? ??????o1|? ?? ??? h iccup mode ??????ea ?? ????????t?a o???y?1|o? ?? ??1???? , 1y??? ? olp ? ?? ?y31?t?????? 1y?1?? ovp ? ?? 1?1?ao 50khz ?? ??a3yo?????1|? ?? ???e?a213?a ??|? ?? ??? ?? ??oe?? ?? ya????l??????? ?? ???????t??????? ?? vcr,svr,dvd&dvcd 2??|?? ?? ?a???a1??? ????a ???a?3???????? pwm ???? ?1????? uvlo ? ?1y?1?? ovp ? ?o???11|a mosfet ?? 24w ??? ??????e????t??? ocp ? ?1y?? ??e????y?1|o???3??????? ?? olp ?o???3??y??????? ?a1????e? e????????a???o??????y? ?a??e????1|???a??e????y ????y?????o?? emi e??? 31??????????1????????e? ?a??e dip-8l & sop-8l ???a ???e????1|??????? vdd ? ?1?????? ??????? sw2 658 a 1 / 8 ? 1. 3 free datasheet http://
?? 1???? 1????3? ?? gnd ?? fb ????y??? pwm ?????|??????y????????1o sense y??? ??2a??112????? vdd-g ?2?????y??????? sense ?2???? vdd e?????? drain ???1 mosfet a?????y???????1?3???2??|??????|?????? ???y????? ???2??? sw2 658 a 2 / 8 ( ?? 1. 3 free datasheet http://
???e|? ???????????? 2?y ?? a?????1?1????? -0.3v to 650v vdd ??1 -0.3v to 30v vdd-g ????1 -0.3v to 30v vdd ???e?? 10ma fb ????1 -0.3v to 7v sense ????1 -0.3v to 7v ?e? / ??1??a? tj -20 ?? to 150 ?? ?e? / ????a? tstg -55 ?? to 160 ?? y???a??o??? 10 ??? 260 ?? ???o 1 ? 3?3??e????t2?y???????3??t???e??e??? 2 ? 3\??1????t????????t????e?? sw2 658 a 3 / 8 ( ?? 1. 3 190~265v 85~265v ? ? ? s w 265 8a 20 w 25 w 12w 1 8 w ?? ?3?1|a?| ??? 24 w? free datasheet http://
??e? ??t?e???? vdd=16v ? ta=25 ??? ?o? 2?y 2a???t ?e? ?e ?? ??? vdd 1??2?? istartup vdd ???? vdd=14.1v ?2a? ? vdd ????a?? ? 5 20 ua i_vdd (operation) 1|? v fb =3v 2 ma uvlo(on) vdd ?????1??? ?e? 8.5 10.7 v uvlo(off) vdd ?3???1??? ?e? 14 17 v ovp ? on ? vdd 1y?1??e? cs=0v,fb=3v y?? vdd ??1? ?? gate 1??? 26.0 30.0 v vdd_clamp vdd ????1 i dd =10ma 30 v ????2?? v fb _open fb ???aa??1 5.0 5.6 6.0 v i fb _short fb ???a? ?a fb ????? 2a? ?a?? 1.55 ma v th _0d ????? fb ?e? ??1 0.8 v v th _pl 1y?? fb ?e????1 3.7 v t d _pl 1y???3?? 50 ms z fb _in fb ?????1 4 k |? ??2a2?? t soft ????? 4 ms t_blanking ?????t?? 300 ns z sense _in sense ?????1 40 k |? t d _oc 1y?2a?????3 ?? ?1y?l? cate ?y ?1?????? 120 ns v th _oc ??t???e????1 fb=3.3v 0.65 0.82 v ????2?? fosc ?y3?????a 45 50 55 khz ? f_temp ?a???a??e? 5 % ? f_vdd vdd ??1??a? ?e? 5 % d_max ?????? fb=3.3v,cs=0v 70 80 90 % f_hiccup hiccup mode ?a 22 khz sw2 658 a 4 / 8 ( ?? 1. 3 free datasheet http://
???e???? sw2 658 a 5 / 8 ( ?? 1. 3 ?
q mosfet ?s bvdss mosfet
p, a 6 5 0 v rds(on)
p-w ??y e v gs =10v i ds =1a 10 $ ?
q???s ? f_soc ?
q??s? -4 4 % i d a????e?? 4 a free datasheet http://
sw2 658 a 6 /8 ( ??1.3 free datasheet http://
??1?- SW2658A??e2??e?1|a????\??a1???1|aa?????????????? 3?1|a?2?? 24w ??? ?a??????3y?1|o?? a?1????? ?e??? hiccup mode ????? ?? ????o??????? SW2658A?????????????? vdd??1?3?? uvlo?off ????? ???????a???e??eo?????????????????2?????????????? ????1? 85v~265v ? ac/dc ????????? 2m |?? 1/8w ?????o 10uf/50v ? vdd ?y??1??????o?1|o?????? ?? 1|? SW2658A?1|????????2ma??e????1|?o hiccup mode??12 ?1??????o??1ea? ?? ??? SW2658A?2???e 4ms????????????????????1||?????? ??????2??1???a vdd ??1?? uvlo ? off ? ??????? 0 ?????? 4ms ?e??????ta?o??????a??????????e?????? ?? ??? hiccup mode ???? ?????????????a??a1??????y?eo???1|a mosfet ??a1??eo????1? ?eo?o3??|??eo??1|a?e?3??y?a1??a??????a1??a?????1|a?e o??????????? SW2658A??a1??a???y?a1???????????????????ee?2?????????? ??????????a??e??a1??a?????a???a?????????????????a? fb ????1 ?a??? hiccup mode ?e????1?????? hiccup mode 1????? vdd ??1?a????? ??e???????y?????? fb ?????a1???a?????a1??eo????????e?y?1|o???a sw2 658 a 7 /8 ?3 free datasheet http://
1??a??????o??o??????a??2???????????????????? ?? ?a?????? emi e?? SW2658A??e?a???1|??????a1??a??????a1??a????h?e32??? ?????1????????-? emi,??????3??? ?? ?y3????a SW2658A?2???e1?? 50khz???a1??a??tea2??y????a ?a??t?ee???? pcb??? ?? ?2?o?????t SW2658A2????? pwm??????????e?e????t??1|????o3??t??1 ?????o?2?1|a mosfet ???????? ?? mosfet ??2????a1???y ?ea?3?????a1??1y?e|??a??a??1??? sense ???? mosfet ??2?? ?a?3?????y?e?????????2??????t?a???a??? sense ???? mosfet ??2????e|??1a?3???1?????????a?????a??3?????a2?? rc ?a????????t??????t????????11???2?1|a mosfet ? pwm ????? e sense ??1o fb ??112?????? ?? ?2?e2213 ????e2213?a??????? pwm e?o? sense ????e|??1ea? ?a???????? ??31? ccm ????????e???1?e32??????e??3???2??1? ?? ?y? SW2658A???1|a mosfet?1y?????????y??????????????y??|??? ?a?????o?a1??eo???????????y? emi ?e???2?? ???? totem pole ????y?????oo???a???y????o???????????a?????? ???-?y????3??eo?o?o?? emi ?e????3y???a??????y????2?? 1y??? vdd o vddg ????????? ??oo??????a?????a???? 1???3? emi ????eo????e?? ?? ????? SW2658A?a???3??y31?????????????ae???????? ???1???1|a mosfet ??ae??????e????t??? ocp ? ?1y???? olp ? ? vdd ??1??? ? uvlo ??? 1y?1? ? ovp ? o vdd ??1|?? ?e????t?? ? ocp ? ?e????1213?????????1??? 85v~265v ?o??1|a?3?????? ? fb ????13?1y1y???t???e? td_pl ??e 50ms ???o??????a1???a1?1? ??????3???? vdd ??1?a??? uvlo ? on ??e?o????????ee? vdd??1??1????1??? vdd??13?1y1y?1??ovp ??e???SW2658A ??1???3????????3???? vdd ??1?a??? uvlo ? on ??e?o????????e e?? vdd ??13?1y vdd ???e????2? vdd ???a?? vdd ??? 30v ?? vdd ????? SW2658A??3????1???? sw2 658 a 8 /8 ( ??1.3 free datasheet http://

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