View R1221N16XH-TR_1057883.PDF datasheet online --- IC-ON-LINE

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no. ea-066-0006 6whs 0 grzq # '& 2 '& # &rqyhuwhu &rqwuroohu # zlwk # 9rowdjh # 'hwhfwru 5 4554 1 # 6(5,(6 $33/,&$7,21 # 0$18$/
step-down dc/dc converter controller with voltage detector 5 4554 1 # 6(5,(6 1 outline 7kh # 5 4554 1 # 6hulhv # duh # 3:0 # vwhs 0 grzq # '& 2 '& # &rqyhuwhu # frqwuroohuv # hpehgghg # zlwk # d # yrowdjh # ghwhfwru /# zlwk # orz vxsso\ # fxuuhqw # e\ # &026 # surfhvv 1 (dfk # vwhs 0 grzq # '& 2 '& # frqyhuwhu # lq # wkhvh # ,&v # frqvlvwv # ri # dq # rvfloodwru /# d # 3:0 # frqwuro # flufxlw /# d # uhihuhqfh # yrowdjh xqlw /# dq # huuru # dpsolilhu /# d # vriw 0 vwduw # flufxlw /# d # surwhfwlrq # flufxlw /# d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# d # fkls # hqdeoh # flufxlw / dqg # uhvlvwruv # iru # yrowdjh # ghwhfwlrq 1# $ # orz # ulssoh /# kljk # hiilflhqf\ # vwhs 0 grzq # '& 2 '& # frqyhuwhu # fdq # eh # frpsrvhg # ri # wklv ,& # zlwk # rqo\ # irxu # h[whuqdo # frpsrqhqwv /# ru # d # srzhu 0 wudqvlvwru /# dq # lqgxfwru /# d # glrgh # dqg # d # fdsdflwru 1 7kh # rxwsxw # yrowdjh # ri # '& 2 '& # frqyhuwhu # fdq # eh # vxshuylvhg # e\ # wkh # exlow 0 lq # yrowdjh # ghwhfwru 1 :lwk # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# zkhq # wkh # ordg # fxuuhqw # lv # vpdoo /# wkh # rshudwlrq # wxuqv # lqwr # wkh # 9)0 # rvfloodwru iurp # 3:0 # rvfloodwru # dxwrpdwlfdoo\ /# wkhuhiruh # wkh # hiilflhqf\ # dw # vpdoo # ordg # fxuuhqw # lv # lpsuryhg 1 $qg # wkh # 3:0 2 9)0 # dowhuqdwlyh # flufxlw # lv # dq # rswlrq /# lq # whupv # ri # & # yhuvlrq # dqg # ' # yhuvlrq /# wkh # flufxlw # lv # qrw # lqfoxghg 1 ,i # wkh # whup # ri # pd[lpxp # gxw\ # f\foh # nhhsv # rq # d # fhuwdlq # wlph /# wkh # hpehgghg # surwhfwlrq # flufxlw # zrunv 1# 7khuh # duh # wzr w\shv # ri # surwhfwlrq # ixqfwlrq 1# 2qh # lv # odwfk 0 w\sh # surwhfwlrq # flufxlw /# dqg # lw # zrunv # wr # odwfk # dq # h[whuqdo # 3rzhu # 026 # zlwk nhhslqj # lw # glvdeoh 1# 7r # uhohdvh # wkh # frqglwlrq # ri # surwhfwlrq /# diwhu # glvdeoh # wklv # ,& # zlwk # d # fkls # hqdeoh # flufxlw /# hqdeoh # lw # djdlq / ru # uhvwduw # wklv # ,& # zlwk # srzhu 0 rq 1# 7kh # rwkhu # lv # 5hvhw 0 w\sh # surwhfwlrq # flufxlw /# dqg # lw # zrunv # wr # uhvwduw # wkh # rshudwlrq # zlwk vriw 0 vwduw # dqg # uhshdw # wklv # rshudwlrq # xqwlo # pd[lpxp # gxw\ # f\foh # frqglwlrq # lv # uhohdvhg 1# (lwkhu # ri # wkhvh # surwhfwlrq # flufxlwv fdq # eh # ghvljqdwhg # e\ # xvhuv *# uhtxhvw 1 features :lgh # 5dqjh # ri # ,qsxw # 9r o w d j h 111111111111111111111111111111111111111111111 516 9 # wr #4615 9 %xlow 0 lq # 6riw 0 vwduw # )xqfwlrq # dqg # wzr # fkrlfhv # ri # 3urwhfwlrq # )xqfwlrq #+ /dwfk 0 w\sh # ru # 5hvhw 0 w\sh , 7z r # fkrlfhv # ri # 2vfloodwru # )uhtxhqf\ 11111111111111111111111111111111 633 n+] /#833 n+] +ljk # (iilflhqf\ 111111111111111111111111111111111111111111111111111111111111111111 7<3 1#<3( 6wdqge\ # &xuuhqw 1111111111111111111111111111111111111111111111111111111111111111 7<3 1#3 m $ 6hwwlqj # 2xwsxw # 9r o w d j h 111111111111111111111111111111111111111111111111111111 6whszlvh # vhwwlqj # zlwk # d # vwhs # ri #314 9 # lq # wkh # udqjh # ri #418 9 wr #813 9 +ljk # $ffxudf\ # 2xwsxw # 9r o w d j h 11111111111111111111111111111111111111111 513( 6hwwlqj # 'hwhfwru # 7kuhvkrog # 9r o w d j h 111111111111111111111111111111111 6whszlvh # vhwwlqj # zlwk # d # vwhs # ri #314 9 # lq # wkh # udqjh # ri #415 9 wr #718 9 +ljk # $ffxudf\ # 'hwhfwru # 7kuhvkrog # 9r o w d j h 11111111111111111111 513( /rz # 7hpshudwxuh 0 'uliw # &rhiilflhqw # ri # 2xwsxw # 9r o w d j h 1111 7<3 1# ? 433 ssp 2 ?&
r1221n 2 applications 3rzhu # vrxufh # iru # kdqg 0 khog # frppxqlfdwlrq # htxlsphqw /# fdphudv /# ylghr # lqvwuxphqwv # vxfk # dv # 9&5v /# fdpfrughuv 1 3rzhu # vrxufh # iru # edwwhu\ 0 srzhuhg # htxlsphqw 1 3rzhu # vrxufh # iru # krxvhkrog # hohfwulfdo # dssoldqfhv 1 block diagram pwm/vfm control soft start chip enable osc vref vref protection v in v out ce gnd ext vd out
r1221n 3 selection guide ,q # wkh # 5 4554 1 # 6hulhv /# wkh # rxwsxw # yrowdjh /# wkh # ghwhfwru # wkuhvkrog /# wkh # rvfloodwru # iuhtxhqf\ /# wkh # rswlrqdo # ixqfwlrq /# dqg wkh # wdslqj # w\sh # iru # wkh # ,&v # fdq # eh # vhohfwhg # dw # wkh # xvhu * v # uhtxhvw 1 7kh # vhohfwlrq # fdq # eh # pdgh # e\ # ghvljqdwlqj # wkh # sduw # qxpehu # dv # vkrzq # ehorz > 5 4554 1;;;; 0 75 --- def code contents d 6hwwlqj # 2xwsxw # 9r o w d j h #+ 9 287 ,= 6whszlvh # vhwwlqj # zlwk # d # vwhs # ri #314 9 # lq # wkh # udqjh # ri #418 9 # wr #813 9 # lv # srvvleoh 1 e 6hwwlqj # 'hwhfwru # 7kuhvkrog #+0 9 '(7 , 6whszlvh # vhwwlqj # zlwk # d # vwhs # ri #314 9 # lq # wkh # udqjh # ri #415 9 # wr #718 9 # lv # srvvleoh 1 $ #=#613 9 f 'hvljqdwlrq # ri # 2vfloodwru # )uhtxhqf\ # dqg # 2swlrqdo # )xqfwlrq $ #=#633 n+] /# zlwk # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# /dwfk 0 w\sh # surwhfwlrq % #=#833 n+] /# zlwk # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# /dwfk 0 w\sh # surwhfwlrq & #=#633 n+] /# zlwkrxw # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# /dwfk 0 w\sh # surwhfwlrq ' #=#833 n+] /# zlwkrxw # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# /dwfk 0 w\sh # surwhfwlrq ( #=#633 n+] /# zlwk # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# 5hvhw 0 w\sh # surwhfwlrq ) #=#833 n+] /# zlwk # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# 5hvhw 0 w\sh # surwhfwlrq * #=#633 n+] /# zlwkrxw # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# 5hvhw 0 w\sh # surwhfwlrq + #=#833 n+] /# zlwkrxw # d # 3:0 2 9)0 # dowhuqdwlyh # flufxlw /# 5hvhw 0 w\sh # surwhfwlrq pin configuration sot-23-6w 5 64 v out gnd ce (mark side) 123 ext vd out v in
r1221n 4 pin description pin no. symbol description 4 (;7 ([whuqdo # 7udqvlvwru # 'ulyh # 3lq #+ 2xwsxw # 7\ s h #># &026 , 5 9' 287 9r o w d j h # 'hwhfwru # 2xwsxw # 3lq #+ 2xwsxw # 7\ s h #># 1fk # 2shq # 'udlq , 6 9 ,1 3rzhu # 6xsso\ # 3lq 7 &( &kls # (qdeoh # 3lq 8 *1' *urxqg # 3lq 9 9 287 3lq # iru # 0rqlwrulqj # 2xwsxw # 9r o w d j h absolute maximum rating symbol item rating unit 9 ,1 9 ,1 # 6xsso\ # 9r o w d j h 48 9 9 (;7 (;7 # 3lq # 2xwsxw # 9r o w d j h 0316 ~ 9 ,1 .316 9 9 &( &( # 3lq # ,qsxw # 9r o w d j h 0316 ~ 9 ,1 .316 9 9' 287 9' 287 # 3lq # 2xwsxw # 9r o w d j h 0316 ~ 48 9 9 287 9 287 # 3lq # ,qsxw # 9r o w d j h 0316 ~ 9 ,1 .316 9 , (;7 (;7 # 3lq # ,qgxfwru # 'ulyh # 2xwsxw # &xuuhqw ? 58 p$ 3' 3rzhu # 'lvvlsdwlrq 583 p: 7rsw 2shudwlqj # 7hpshudwxuh # 5dqjh 073 ~ .;8 ?& 7v w j 6 w r u d j h # 7hpshudwxuh # 5dqjh 088 ~ .458 ?&
r1221n 5 electrical characteristics r1221n***a (c,e,g) output voltage : vo, detector threshold : v d + 7r s w 58 ?& , symbol item conditions min. typ. max. note* unit 9 ,1 2shudwlqj # ,qsxw # 9r o w d j h 516 4615 9 9 287 6whs 0 grzq # 2xwsxw # 9r o w d j h 9 ,1 9 &( 9r .415 9 /# , 287 043 p$ 9r 31<; 9r 9r 4135 $9 d 9 287 2 d 7 6whs 0 grzq # 2xwsxw # 9r o w d j h 7hpshudwxuh # &rhiilflhqw 073 ?& 7r s w ;8 ?& ? 433 ssp 2 ?& irvf 2vfloodwru # )uhtxhqf\ 9 ,1 9 &( 9r .415 9 /# , 287 0433 p$ 573 633 693 $n+] d irvf 2 d 7 )uhtxhqf\ # 7hpshudwxuh &rhiilflhqw 073 ?& 7r s w ;8 ?& ? 316 (2 ?& , '' 4 6xsso\ # &xuuhqw 4 9 ,1 4615 9 /# 9 &( 4615 9 / 9 287 4615 9 433 493 %?$ ,vwe 6wdqge\ # &xuuhqw 9 ,1 4615 9 /# 9 &( 3 9 /# 9 287 3 9 3 318 &?$ , (;7+ (;7 # + # 2xwsxw # &xuuhqw 9 ,1 ; 9 /# 9 (;7 :1< 9 /# 9 287 ; 9 / 9 &( ; 9 043 09 'p$ , (;7/ (;7 # / # 2xwsxw # &xuuhqw 9 ,1 ; 9 /# 9 (;7 314 9 /# 9 287 3 9 / 9 &( 3 9 43 53 'p$ , &(+ &( # + # ,qsxw # &xuuhqw 9 ,1 4615 9 /# 9 &( 4615 9 / 9 287 4615 9 3 318 (?$ , &(/ &( # / # ,qsxw # &xuuhqw 9 ,1 4615 9 /# 9 &( 3 9 /# 9 287 4615 9 0318 3 (?$ 9 &(+ &( # + # ,qsxw # 9r o w d j h 9 ,1 ; 9 /# 9 &( 3 9 ? 418 9 31; 415 )9 9 &(/ &( # / # ,qsxw # 9r o w d j h 9 ,1 ; 9 /# 9 &( 418 9 ? 3 9 316 31; )9 0d[gw\ 2vfloodwru # 0d[lpxp # 'xw\ &\foh 433 ( 9)0gw\ 9)0 # 'xw\ # &\foh $ssolhg # wr # % # dqg # ) # yhuvlrqv # rqo\ 58 ( 7v w d u w 'hod\ # 7lph # e\ # 6riw 0 6wduw ixqfwlrq 9 ,1 9r .415 9 /# 9 &( 3 9 ? 9r .415 9 $w #;3(# ri # ulvlqj 84349 )pv 7surw 'hod\ # 7lph # iru # surwhfwlrq flufxlw 9 ,1 9r .415 9 /# 9 &( 9r .415 9 ? 3 9 468 *pv , 9'/. 9' 287 # 2xwsxw # /hdndjh &xuuhqw 9 ,1 9 287 9 &( 9 '287 ; 9 3 318 ,?$ , 9'/ 9' 287 # / # 2xwsxw # &xuuhqw 9 ,1 9 287 516 9 /# 9 &( 3 9 / 9 '287 314 9 318 4 ,p$
r1221n 6 symbol item conditions min. typ. max. note* unit 0 9 '(7 'hwhfwru # 7kuhvkrog 9 ,1 9 9 /# 9 &( 9 9 / 9 287 9 ' 415 9 ? 3 9 9 ' 31<; 9 ' 9 ' 4135 -9 w9 '(7 2xwsxw # 'hod\ # 7lph # iru 5hohdvhg # 9r o w d j h 9 ,1 9 9 /# 9 &( 9 9 / 9 287 3 9 ? 9 ' 415 9 $w #;3(# ri # ulvlqj 5843 -pv 9 +<6 'hwhfwru # 7kuhvkrog # +\v 0 whuhvlv 9 ,1 9 9 /# 9 &( 9 9 / 9 287 3 9 ? 9 ' 415 9 9 ' 3134 9 ' 3136 9 ' 3138 -p9 d 0 9 '(7 2 d 7 'hwhfwru # 7kuhvkrog # 7h p 0 shudwxuh # &rhiilflhqw 073 ?& 7r s w ;8 ?& ? 433 ssp 2 ?& 1rwh =# 5hihu # wr # 7h v w # &lufxlwv
r1221n 7 r1221n***b (d,f,h) output voltage : vo, detector threshold : v d + 7r s w 58 ?& , symbol item conditions min. typ. max. note* unit 9 ,1 2shudwlqj # ,qsxw # 9r o w d j h 516 4615 9 9 287 6whs 0 grzq # 2xwsxw # 9r o w d j h 9 ,1 9 &( 9r .415 9 /# , 287 043 p$ 9r 31<; 9r 9r 4135 $9 d 9 287 2 d 7 6whs 0 grzq # 2xwsxw # 9r o w d j h 7hpshudwxuh # &rhiilflhqw 073 ?& 7r s w ;8 ?& ? 433 ssp 2 ?& irvf 2vfloodwru # )uhtxhqf\ 9 ,1 9 &( 9r .415 9 /# , 287 0433 p$ 733 833 933 $n+] d irvf 2 d 7 )uhtxhqf\ # 7hpshudwxuh &rhiilflhqw 073 ?& 7r s w ;8 ?& ? 316 (2 ?& , '' 4 6xsso\ # &xuuhqw 4 9 ,1 4615 9 /# 9 &( 4615 9 / 9 287 4615 9 473 533 %?$ ,vwe 6wdqge\ # &xuuhqw 9 ,1 4615 9 /# 9 &( 3 9 /# 9 287 3 9 3 318 &?$ , (;7+ (;7 # + # 2xwsxw # &xuuhqw 9 ,1 ; 9 /# 9 (;7 :1< 9 /# 9 287 ; 9 / 9 &( ; 9 043 09 'p$ , (;7/ (;7 # / # 2xwsxw # &xuuhqw 9 ,1 ; 9 /# 9 (;7 314 9 /# 9 287 3 9 / 9 &( 3 9 43 53 'p$ , &(+ &( # + # ,qsxw # &xuuhqw 9 ,1 4615 9 /# 9 &( 4615 9 / 9 287 4615 9 3 318 (?$ , &(/ &( # / # ,qsxw # &xuuhqw 9 ,1 4615 9 /# 9 &( 3 9 /# 9 287 4615 9 0318 3 (?$ 9 &(+ &( # + # ,qsxw # 9r o w d j h 9 ,1 ; 9 /# 9 &( 3 9 ? 418 9 31; 415 )9 9 &(/ &( # / # ,qsxw # 9r o w d j h 9 ,1 ; 9 /# 9 &( 418 9 ? 3 9 316 31; )9 0d[gw\ 2vfloodwru # 0d[lpxp # 'xw\ &\foh 433 ( 9)0gw\ 9)0 # 'xw\ # &\foh $ssolhg # wr # % # dqg # ) # yhuvlrqv # rqo\ 58 ( 7v w d u w 'hod\ # 7lph # e\ # 6riw 0 6wduw ixqfwlrq 9 ,1 9r .415 9 /# 9 &( 3 9 ? 9r .415 9 $w #;3(# ri # ulvlqj 6943 )pv 7surw 'hod\ # 7lph # iru # surwhfwlrq flufxlw 9 ,1 9r .415 9 /# 9 &( 9r .415 9 ? 3 9 457 *pv , 9'/. 9' 287 # 2xwsxw # /hdndjh &xuuhqw 9 ,1 9 287 9 &( 9 '287 ; 9 3 318 ,?$ , 9'/ 9' 287 # / # 2xwsxw # &xuuhqw 9 ,1 9 287 516 9 /# 9 &( 3 9 / 9 '287 314 9 318 4 ,p$ 0 9 '(7 'hwhfwru # 7kuhvkrog 9 ,1 9 9 /# 9 &( 9 9 / 9 287 9 ' 415 9 ? 3 9 9 ' 31<; 9 ' 9 ' 4135 -9
r1221n 8 symbol item conditions min. typ. max. note* unit 79 '(7 2xwsxw # 'hod\ # 7lph # iru 5hohdvhg # 9r o w d j h 9 ,1 9 9 /# 9 &( 9 9 / 9 287 3 9 ? 9 ' 415 9 $w #;3(# ri # ulvlqj 418 618 913 -pv 9 +<6 'hwhfwru # 7kuhvkrog # +\v 0 whuhvlv 9 ,1 9 9 /# 9 &( 9 9 / 9 287 3 9 ? 9 ' 415 9 9 ' 3134 9 ' 3136 9 ' 3138 -p9 d 0 9 '(7 2 d 7 'hwhfwru # 7kuhvkrog # 7h p 0 shudwxuh # &rhiilflhqw 073 ?& 7r s w ;8 ?& ? 433 ssp 2 ?& 1rwh =# 5hihu # wr # 7h v w # &lufxlwv test circuits a) sd c l pmos v in c in 3 l oscilloscope 42 6 1 5 v d) v in v out v ext 425 316 a b) c in v in 3 4 6 1 5 2 a e) v in 316 425 a c) v in 36 1 45 2 a f) sd c l pmos v in c in 316 425 l oscilloscope v
r1221n 9 g) v in v out 316 425 oscilloscope i) a vd out v in 316 425 h) v in 36 1 45 2 a v out j) v out v in 316 425 oscilloscope r ,qgxfwru # / #=#5: ?+ #+ 6xplgd # (ohfwurqlf /# &' 437, 'lrgh # 6' =# 5% 7<4 ' #+ 5rkp /# 6fkrwwn\ # w\sh , &dsdflwru # & / =#7: ?) #+ 7dqwdoxp # w\sh , & ,1 #=#55 ?) #+ 7dqwdoxp # w\sh , 3rzhu # 026 # 3026 #=# +$7 4353 5 #+ +lwdfkl , 5hvlvwru # 5 #=#433 n w typical applications and application hints r1 sd1 c out pmos cpu ce control c in v in l ce v out vd out ext gnd v cc reset/ 3026 =# +$7 4353 5 #+ +lwdfkl ,/# 6l 6776 '9 #+ 6lolfrql[ , / =# &' 438#+ 6xplgd /#5: ?+ , 6' 4# =# 5% 7<4 ' #+ 5rkp , & 287 #=#7: ?) #+ 7dqwdoxp # 7\ s h , & ,1 #=43 ?) #+ 7dqwdoxp # 7\ s h , 5 4 =#433 n w
r1221n 10 :khq # \rx # xvh # wkhvh # ,&v /# frqvlghu # wkh # iroorzlqj # lvvxhv > $v # vkrzq # lq # wkh # eorfn # gldjudp /# d # sdudvlwlf # glrgh # lv # iruphg # lq # hdfk # whuplqdo /# hdfk # ri # wkhvh # glrghv # lv # qrw # iruphg # iru ordg # fxuuhqw /# wkhuhiruh # gr # qrw # xvh # lw # lq # vxfk # d # zd\ 1# :khq # \rx # frqwuro # wkh # &( # slq # e\ # dqrwkhu # srzhu # vxsso\ /# gr # qrw pdnh # lwv # + # ohyho # pruh # wkdq # wkh # yrowdjh # ohyho # ri # 9 ,1 # slq 1 'hwhfwru # wkuhvkrog # k\vwhuhvlv # lv # vhw # dw #6# shufhqw # ri # ghwhfwru # wkuhvkrog # yrowdjh 1#+ 0lq 1#4# shufhqw /# 0d[ 1#8# shufhqw , 6hwwlqj # 'hwhfwru # wkuhvkrog # yrowdjh # udqjh # ghshqgv # rq # 2xwsxw # yrowdjh # ri # '& 2 '& # frqyhuwhu 1 5hohdvh # 9r o w d j h # iurp # 5hvhw # frqglwlrq # pxvw # qrw # eh # pruh # wkdq # 2xwsxw # yrowdjh # ri # '& 2 '& # frqyhuwhu 1 + 'hwhfwru # 7kuhvkrog # 9r o w d j h 413:#?# 2xwsxw # 9r o w d j h # ri # '& 2 '& # frqyhuwhu 31<; :khq # wkh # 5 4554 1;;;; # lv # rq # vwdqg 0 e\ # prgh /# wkh # rxwsxw # yrowdjh # ri # 9' 287 # lv # *1' # ohyho /# wkhuhiruh # li # wkh # sxoo 0 xs # uh 0 vlvwru # iru # 9' 287 # slq # lv # sxoohg # xs # dqrwkhu # srzhu # vxsso\ /# d # fhuwdlq # dprxqw # ri # fxuuhqw # lv # ordglqj # wkurxjk # wkh # uhvlvwru 1 7kh # rshudwlrq # ri # /dwfk 0 w\sh # surwhfwlrq # flufxlw # lv # dv # iroorzv > :khq # wkh # pd[lpxp # gxw\ # f\foh # frqwlqxhv # orqjhu # wkdq # wkh # ghod\ # wlph # iru # surwhfwlrq # flufxlw /#+ 5hihu # wr # wkh # (ohfwulfdo &kdudfwhulvwlfv ,# wkh # surwhfwlrq # flufxlw # zrunv # wr # vkxw 0 grzq # wkh # h[whuqdo # 3rzhu # 026 # zlwk # lwv # odwfklqj # rshudwlrq 1 7khuhiruh # zkhq # dq # lqsxw 2 rxwsxw # yrowdjh # gliihuhqfh # lv # vpdoo /# wkh # surwhfwlrq # flufxlw # pd\ # zrun # hyhq # dw # vpdoo # ordg # fxu 0 uhqw 1 7r # uhohdvh # wkh # surwhfwlrq # vwdwh /# diwhu # glvdeoh # wklv # ,& # zlwk # d # fkls # hqdeoh # flufxlw /# hqdeoh # lw # djdlq /# ru # uhvwduw # wklv # ,& # zlwk srzhu 0 rq 1# +rzhyhu /# lq # wkh # fdvh # ri # uhvwduwlqj # wklv # ,& # zlwk # srzhu 0 rq /# diwhu # wkh # srzhu # vxsso\ # lv # wxuqhg # rii /# li # d # fhuwdlq dprxqw # ri # fkdujh # uhpdlqv # lq # & ,1 /# ru # vrph # yrowdjh # lv # irufhg # wr # 9 ,1 # iurp # & ,1 /# wklv # ,& # pljkw # qrw # eh # uhvwduwhg # hyhq # diwhu srzhu 0 rq 1 ,i # ulvlqj # wudqvlwlrq # vshhg # ri # vxsso\ # yrowdjh # lv # wrr # vorz /# ru # wkh # wlph # zklfk # lv # uhtxluhg # iru # 9 ,1 # yrowdjh # wr # uhdfk # 2xwsxw 9r o w d j h # ri # '& 2 '& # frqyhuwhu # lv # orqjhu # wkdq # vriw 0 vwduwlqj # wlph # soxv # ghod\ # wlph # iru # surwhfwlrq # flufxlw /# surwhfwlrq # flufxlw zrunv # ehiruh # 9 ,1 # yrowdjh # uhdfkhv # 2xwsxw # 9r o w d j h # ri # '& 2 '& # frqyhuwhu 1# 7r # dyrlg # wklv # frqglwlrq /# pdnh # wklv # ,& # glvdeoh + &( / ,# iluvw /# wkhq # irufh # 9 ,1 # yrowdjh /# dqg # diwhu # 9 ,1 # yrowdjh # ehfrphv # htxdo # ru # pruh # wkdq # 9 287 /# pdnh # wklv # ,& # hqdeoh + &( + ,1 6hw # h[whuqdo # frpsrqhqwv # dv # forvh # dv # srvvleoh # wr # wkh # ,& # dqg # plqlpl]h # wkh # frqqhfwlrq # ehwzhhq # wkh # frpsrqhqwv # dqg wkh # ,& 1# ,q # sduwlfxodu /# d # fdsdflwru # vkrxog # eh # frqqhfwhg # wr # 9 287 # slq # zlwk # wkh # plqlpxp # frqqhfwlrq 1# $qg # pdnh # vxiilflhqw jurxqglqj # dqg # uhlqirufh # vxsso\lqj 1# $ # odujh # vzlwfklqj # fxuuhqw # iorzv # wkurxjk # wkh # frqqhfwlrq # ri # srzhu # vxsso\ /# dq # lq 0 gxfwru # dqg # wkh # frqqhfwlrq # ri # 9 287 1# ,i # wkh # lpshgdqfh # ri # srzhu # vxsso\ # olqh # lv # kljk /# wkh # yrowdjh # ohyho # ri # srzhu # vxsso\ # ri wkh # ,& # ioxfwxdwhv # zlwk # wkh # vzlwfklqj # fxuuhqw 1# 7klv # pd\ # fdxvh # xqvwdeoh # rshudwlrq # ri # wkh # ,& 1 8vh # fdsdflwruv # zlwk # d # fdsdflw\ # ri #55 ?) # ru # pruh # iru # 9 287 # 3lq /# dqg # zlwk # jrrg # kljk # iuhtxhqf\ # fkdudfwhulvwlfv # vxfk # dv wdqwdoxp # fdsdflwruv 1# :h # uhfrpphqg # \rx # wr # xvh # fdsdflwruv # zlwk # dq # doorzdeoh # yrowdjh # zklfk # lv # dw # ohdvw # wzlfh # dv # pxfk dv # vhwwlqj # rxwsxw # yrowdjh 1# 7klv # lv # ehfdxvh # wkhuh # pd\ # eh # d # fdvh # zkhuh # d # vslnh 0 vkdshg # kljk # yrowdjh # lv # jhqhudwhg # e\ # dq lqgxfwru # zkhq # dq # h[whuqdo # wudqvlvwru # lv # rq # dqg # rii 1 &krrvh # dq # lqgxfwru # wkdw # kdv # vxiilflhqwo\ # vpdoo # ' 1 & 1# uhvlvwdqfh # dqg # odujh # doorzdeoh # fxuuhqw # dqg # lv # kdug # wr # uhdfk # pdj 0 qhwlf # vdwxudwlrq 1# $qg # li # wkh # ydoxh # ri # lqgxfwdqfh # ri # dq # lqgxfwru # lv # h[wuhpho\ # vpdoo /# wkh # , /; # pd\ # h[fhhg # wkh # devroxwh pd[lpxp # udwlqj # dw # wkh # pd[lpxp # ordglqj 1 8vh # dq # lqgxfwru # zlwk # dssursuldwh # lqgxfwdqfh 1 8vh # d # glrgh # ri # d # 6fkrwwn\ # w\sh # zlwk # kljk # vzlwfklqj # vshhg /# dqg # dovr # sd\ # dwwhqwlrq # wr # lwv # fxuuhqw # fdsdflw\ 1 'r # qrw # xvh # wklv # ,& # xqghu # wkh # frqglwlrq # dw # 9 ,1 # yrowdjh # ohvv # wkdq # plqlpxp # rshudwlqj # yrowdjh 1
r1221n 11 i 7kh # shuirupdqfh # ri # srzhu # vrxufh # flufxlwv # xvlqj # wkhvh # ,&v # h[wuhpho\ # ghshqgv # xsrq # wkh # shulskhudo # flufxlwv 1 3d\ # dwwhqwlrq # lq # wkh # vhohfwlrq # ri # wkh # shulskhudo # flufxlwv 1# ,q # sduwlfxodu /# ghvljq # wkh # shulskhudo # flufxlwv # lq # d # zd\ # wkdw wkh # ydoxhv # vxfk # dv # yrowdjh /# fxuuhqw /# dqg # srzhu # ri # hdfk # frpsrqhqw /# 3&% # sdwwhuqv # dqg # wkh # ,& # gr # qrw # h[fhhg # wkhlu uhvshfwhg # udwhg # ydoxhv 1 operation of step-down dc/dc converter and output current 7kh # vwhs 0 grzq # '& 2 '& # frqyhuwhu # fkdujhv # hqhuj\ # lq # wkh # lqgxfwru # zkhq # /[ # wudqvlvwru # lv # 21 /# dqg # glvfkdujhv # wkh # hq 0 huj\ # iurp # wkh # lqgxfwru # zkhq # /[ # wudqvlvwru # lv # 2)) # dqg # frqwurov # zlwk # ohvv # hqhuj\ # orvv /# vr # wkdw # d # orzhu # rxwsxw # yrowdjh wkdq # wkh # lqsxw # yrowdjh # lv # rewdlqhg 1# 7kh # rshudwlrq # zloo # eh # h[sodlqhg # zlwk # uhihuhqfh # wr # wkh # iroorzlqj # gldjudpv #= sd v in lxtr c l v out i out l i2 i1 ilmin il ilmax topen t=1/fosc ton toff 6whs #4#= /[7u # wxuqv # rq # dqg # fxuuhqw # ,/ #+ l 4,# iorzv /# dqg # hqhuj\ # lv # fkdujhg # lqwr # &/ 1# $w # wklv # prphqw /# ,/ # lqfuhdvhv # iurp ,/plq #+ 3,# wr # uhdfk # ,/pd[ # lq # sursruwlrq # wr # wkh # rq 0 wlph # shulrg #+ wrq ,# ri # /;7u 1 6whs #5#= :khq # /[7u # wxuqv # rii /# 6fkrwwn\ # glrgh #+ 6' ,# wxuqv # rq # lq # rughu # wkdw # / # pdlqwdlqv # ,/ # dw # ,/pd[ /# dqg # fxuuhqw # ,/ #+ l 5, iorzv 1 6whs #6#= ,/ # ghfuhdvhv # judgxdoo\ # dqg # uhdfkhv # ,/plq # diwhu # d # wlph # shulrg # ri # wrshq /# dqg # 6' # wxuqv # rii /# surylghg # wkdw # lq # wkh frqwlqxrxv # prgh /# qh[w # f\foh # vwduwv # ehiruh # ,/ # ehfrphv # wr #3# ehfdxvh # wrii # wlph # lv # qrw # hqrxjk 1# ,q # wklv # fdvh /# ,/ ydoxh # lv # iurp # wklv # ,/plq + ! 3,1 ,q # wkh # fdvh # ri # 3:0 # frqwuro # v\vwhp /# wkh # rxwsxw # yrowdjh # lv # pdlqwdlqhg # e\ # frqwuroolqj # wkh # rq 0 wlph # shulrg #+ wrq ,/# vlwk wkh # rvfloodwru # iuhtxhqf\ #+ irvf ,# ehlqj # pdlqwdlqhg # frqvwdqw 1 discontinuous conduction mode and continuous conduction mode 7kh # pd[lpxp # ydoxh #+ ,/pd[ ,# dqg # wkh # plqlpxp # ydoxh #+ ,/plq ,# ri # wkh # fxuuhqw # zklfk # iorzv # wkurxjk # wkh # lqgxfwru # duh wkh # vdph # dv # wkrvh # zkhq # /[7u # lv # 21 # dqg # zkhq # lw # lv # 2)) 1 7kh # gliihuhqfh # ehwzhhq # ,/pd[ # dqg # ,/plq /# zklfk # lv # uhsuhvhqwhg # e\ # d , #> d , # ,/pd[ #0 ,/plq # 9 287 wrshq 2 / + 9 ,1 0 9 287 , wrq 2 / 111111111111111111111111111111111111111111111111111111111111111111111111111111 (txdwlrq #4
r1221n 12 zkhuhlq # 7 42 irvf wrq . wrii gxw\ #+(, wrq 2 7 433 wrq irvf 433 wrshq wrii ,q # (txdwlrq #4/# 9 287 wrshq 2 / # dqg #+ 9 ,1 0 9 287 , wrq 2 / # duh # uhvshfwlyho\ # vkrz # wkh # fkdqjh # ri # wkh # fxuuhqw # dw # 21 /# dqg # wkh fkdqjh # ri # wkh # fxuuhqw # dw # 2)) 1 :khq # wkh # rxwsxw # fxuuhqw #+ , 287 ,# lv # uhodwlyho\ # vpdoo /# wrshq ? wrii # dv # looxvwudwhg # lq # wkh # deryh # gldjudp 1# ,q # wklv # fdvh /# wkh hqhuj\ # lv # fkdujhg # lq # wkh # lqgxfwru # gxulqj # wkh # wlph # shulrg # ri # wrq # dqg # lv # glvfkdujhg # lq # lwv # hqwluho\ # gxulqj # wkh # wlph # shulrg ri # wrii /# wkhuhiruh # ,/plq # ehfrphv # wr # ]hur #+ ,/plq 3,1# :khq # , 287 # lv # judgxdoo\ # lqfuhdvhg /# hyhqwxdoo\ /# wrshq # ehfrphv # wr wrii #+ wrshq # # wrii ,/# dqg # zkhq # , 287 # lv # ixuwkhu # lqfuhdvhg /# ,/plq # ehfrphv # odujhu # wkdq # ]hur #+ ,/plq! 3,1# 7kh # iruphu # prgh # lv uhihuuhg # wr # dv # wkh # glvfrqwlqxrxv # prgh # dqg # wkh # odwwhu # prgh # lv # uhihuuhg # wr # dv # frqwlqxrxv # prgh 1 ,q # wkh # frqwlqxrxv # prgh /# zkhq # (txdwlrq #4# lv # vroyhg # iru # wrq # dqg # dvvxphg # wkdw # wkh # vroxwlrq # lv # wrqf / wrqf # 7 9 ,1 2 9 287 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 111111111 (txdwlrq #5 :khq # wrq ? wrqf /# wkh # prgh # lv # wkh # glvfrqwlqxrxv # prgh /# dqg # zkhq # wrq # # wrqf /# wkh # prgh # lv # wkh # frqwlqxrxv # prgh 1 output current and selection of external components :khq # /[7u # lv # 21 = + :khuhlq /# 5lssoh # &xuuhqw # 3 0 3 # ydoxh # lv # ghvfulehg # dv # , 53 /# 21 # uhvlvwdqfh # ri # /;7u # lv # ghvfulehg # dv # 5s # wkh # gluhfw # fxuuhqw ri # wkh # lqgxfwru # lv # ghvfulehg # dv # 5 / 1, 9 ,1 9 287 .+ 5 3 #. 5 / , , 287 . / , 53 2 wrq 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 (txdwlrq #6 :khq # /[7u # lv # 2)) = / , 53 2# wrii # 9 ) . 9 287 . 5 / , 287 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 (txdwlrq #7 3xw # (txdwlrq #7# wr # (txdwlrq #6# dqg # vroyh # iru # 21 # gxw\ /# wrq 2+ wrii . wrq , ' 21 / ' 21 + 9 287 . 9 ) . 5 / , 287 ,2+ 9 ,1 . 9 ) 0 5s , 287 , 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 (txdwlrq #8 5lssoh # &xuuhqw # lv # dv # iroorzv > , 53 + 9 ,1 0 9 287 0 5 3 , 287 0 5 / , 287 , ' 21 2 i 2 / #111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 (txdwlrq #9 zkhuhlq /# shdn # fxuuhqw # wkdw # iorzv # wkurxjk # / /# /[7u /# dqg # 6' # lv # dv # iroorzv > ,/pd[ , 287 . , 53 25 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 1111111111 (txdwlrq #:
r1221n 13 &rqvlghu # ,/pd[ /# frqglwlrq # ri # lqsxw # dqg # rxwsxw # dqg # vhohfw # h[whuqdo # frpsrqhqwv 1 h 7kh # deryh # h[sodqdwlrq # lv # gluhfwhg # wr # wkh # fdofxodwlrq # lq # dq # lghdo # fdvh # lq # frqwlqxrxv # prgh 1 external components 1. inductor 6hohfw # dq # lqgxfwru # wkdw # shdn # fxuuhqw # grhv # qrw # h[fhhg # ,/pd[ 1# ,i # odujhu # fxuuhqw # wkdq # doorzdeoh # fxuuhqw # iorzv /# pdj 0 qhwlf # vdwxudwlrq # rffxuv # dqg # pdnh # wudqvirup # hiilflhqf\ # zruvh 1 :khq # wkh # ordg # fxuuhqw # lv # vdph /# wkh # vpdoohu # ydoxh # ri # / /# wkh # odujhu # wkh # ulssoh # fxuuhqw 1 3urylghg # wkdw # wkh # doorzdeoh # fxuuhqw # lv # odujh # lq # wkdw # fdvh # dqg # '& # fxuuhqw # lv # vpdoo /# wkhuhiruh /# iru # odujh # rxwsxw # fxuuhqw / hiilflhqf\ # lv # ehwwhu # wkdq # xvlqj # dq # lqgxfwru # zlwk # d # odujh # ydoxh # ri # / # dqg # ylfh # yhuvd / 2diode 8vh # d # glrgh # zlwk # orz # 9 ) #+ 6fkrwwn\ # w\sh # lv # uhfrpphqghg 1,# dqg # kljk # vzlwfklqj # vshhg 1 5hyhuvh # yrowdjh # udwlqj # vkrxog # eh # pruh # wkdq # 9 ,1 # dqg # fxuuhqw # udwlqj # vkrxog # eh # htxdo # ru # pruh # wkdq # ,/pd[ 1 61 &dsdfl t ru $v # iru # & ,1 /# xvh # d # fdsdflwru # zlwk # orz # (65 #+ (txlydohqw # 6hulhv # 5hvlvwdqfh ,# dqg # d # fdsdflw\ # ri # dw # ohdvw #43 ?) # iru # vwdeoh rshudwlrq 1# & 287 # fdq # uhgxfh # ulssoh # ri # 2xwsxw # 9r o w d j h /# wkhuhiruh #7:# wr #433 ?) # wdqwdoxp # w\sh # lv # uhfrpphqghg 1 4. lx transistor 3fk # 3rzhu # 026 # )(7 # lv # uhtxluhg # iru # wklv # ,& 1 ,wv # euhdngrzq # yrowdjh # ehwzhhq # jdwh # dqg # vrxufh # vkrxog # eh # d # ihz # yrow # kljkhu # wkdq # ,qsxw # 9r o w d j h 1 ,q # wkh # fdvh # ri # ,qsxw # 9r o w d j h # lv # orz /# wr # wxuq # rq # 026 # )(7 # frpsohwho\ /# vhohfw # d # 026 # )(7 # zlwk # orz # wkuhvkrog # yrowdjh 1 ,i # d # odujh # ordg # fxuuhqw # lv # qhfhvvdu\ # iru # \rxu # dssolfdwlrq # dqg # lpsruwdqw /# fkrrvh # d # 026 # )(7 # zlwk # orz # 21 # uhvlvwdqfh iru # jrrg # hiilflhqf\ 1 ,i # d # vpdoo # ordg # fxuuhqw # lv # pdlqo\ # qhfhvvdu\ # iru # \rxu # dssolfdwlrq /# fkrrvh # d # 026 # )(7 # zlwk # orz # jdwh # fdsdflw\ # iru # jrrg hiilflhqf\ 1 0d[lpxp # frqwlqxrxv # gudlq # fxuuhqw # ri # 026 # )(7 # vkrxog # eh # odujhu # wkdq # shdn # fxuuhqw /# ,/pd[ 1
r1221n 14 typical characteristcs 1) output voltage vs. output current l=27 m h 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 3.360 3.380 3.400 output current i out (a) 12v 8v 4.5v 1e-05 0.0001 0.001 0.01 0.1 1 output voltage v out (v) r1221n33ah l=27 m h 1.480 1.520 1.515 1.510 1.505 1.500 1.495 1.490 1.485 output current i out (a) 13.2v 8v 5v 2.3v 1e-05 0.0001 0.001 0.01 0.1 1 output voltage v out (v) r1221n15xh 2) efficiency vs. output current cd104-27 m h si3443dv 0 10 20 30 40 50 60 70 80 90 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n33aa(v in =4.5v) cd104-27 m h si3443dv 0 10 20 30 40 50 60 70 80 90 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n33aa(v in =12v) cd104-27 m h si3443dv 0 20 40 60 80 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n33ac(v in =4.5v) cd104-27 m h si3443dv 0 20 40 60 80 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n33ab(v in =12v)
r1221n 15 cd104-27 m h si3443dv 0 10 20 30 40 50 60 70 80 90 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n33ac(v in =4.5v) cd104-27 m h si3443dv 0 10 20 30 40 50 60 70 80 90 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n33ac(v in =12v) cd104-27 m h si3443dv 0 20 40 60 80 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n50xa(v in =6.0v) cd104-27 m h si3443dv 0 20 40 60 80 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n50xa(v in =12v) cd104-27 m h si3443dv 0 20 40 60 80 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n50xb(v in =6.0v) cd104-27 m h si3443dv 0 20 40 60 80 100 output current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n50xb(v in =12v)
r1221n 16 cd104-27 m h si3443dv 0 20 40 60 80 100 outpur current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n50xc(v in =6.0v) cd104-27 m h si3443dv 0 20 40 60 80 100 outpur current i out (ma) 0.1 1 10 100 1000 efficiency h (%) r1221n50xc(v in =12v) 3) ripple voltage vs. output current l=27 m h c=47 m f(ta) 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) v in =4.5v v in =8v v in =12v 1 10 100 1000 ripple voltage v rpp (mv) r1221n33aa l=27 m h c=47 m f(ta) 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) v in =6v v in =8v v in =12v 1 10 100 1000 ripple voltage v rpp (mv) r1221n33aa l=27 m h c=47 m f(ta) 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) v in =4.5v v in =8v v in =12v 1 10 100 1000 ripple voltage v rpp (mv) r1221n33ab l=27 m h c=47 m f(ta) 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) v in =6v v in =8v v in =12v 1 10 100 1000 ripple voltage v rpp (mv) r1221n50xb
r1221n 17 l=27 m h c=47 m f(ta) 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) v in =4.5v v in =8v v in =12v 1 10 100 1000 ripple voltage v rpp (mv) r1221n33ac l=27 m h c=47 m f(ta) 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) v in =6v v in =8v v in =12v 1 10 100 1000 ripple voltage v rpp (mv) r1221n50xc 4) oscillator frequency vs. input voltage l=27 m h 0 100 200 300 400 500 600 input voltage v in (v) 0 5 10 15 oscillator frequency fosc(khz) r1221n15xb l=27 m h 0 100 200 300 400 500 600 input voltage v in (v) 0 5 10 15 oscillator frequency fosc(khz) r1221n15xa 5) output voltage vs. input voltage l=27 m h 1.47 1.48 1.49 1.50 1.51 1.52 1.53 input voltage v in (v) 0 5 10 15 output voltage v out (v) r1221n15xb l=27 m h 1.47 1.48 1.49 1.50 1.51 1.52 1.53 input voltage v in (v) 0 5 10 15 output voltage v out (v) r1221n15xa
r1221n 18 l=27 m h 3.24 3.26 3.28 3.30 3.32 3.34 3.36 input voltage v in (v) 0 5 10 15 output voltage v out (v) r1221n33ab l=27 m h 3.24 3.26 3.28 3.30 3.32 3.34 3.36 input voltage v in (v) 0 5 10 15 output voltage v out (v) r1221n33aa 6) output voltage vs. temperature l=27 m h 3.27 3.28 3.29 3.30 3.31 temperature topt ( c) -50 0 50 100 output voltage v out (v) r1221n33ah l=27 m h v in =2.7v 1.47 1.48 1.49 1.50 1.51 temperature topt ( c) -50 0 50 100 output voltage v out (v) r1221n15xb 7) detector threshold vs. temperature temperature topt ( c) -50 0 50 100 1.97 1.98 1.99 2.00 2.01 detector threshold vd out (v) v in =6v r1221n25xa(vd=2.0v) temperature topt ( c) -50 0 50 100 1.18 1.19 1.20 1.21 1.22 detector threshold vd out (v) v in =6v r1221n15xb(vd=1.2v)
r1221n 19 temperature topt ( c) -50 0 50 100 2.94 2.96 2.98 3.00 3.04 3.02 3.06 detector threshold vd out (v) v in =6v r1221n33ab(vd=3.0v) 8) oscillator frequency vs. temperature temperature topt ( c) -50 0 50 100 400 450 500 550 600 oscillator frequency fosc(khz) l=27 m h v in =4.5v r1221n33ab l=27 m h v in =3.7v temperature topt ( c) -50 0 50 100 240 260 280 300 340 320 360 oscillator frequency fosc(khz) r1221n25xa 9) supply current vs. temperature temperature topt ( c) -50 0 50 100 90 95 105 100 110 115 120 130 125 135 supply current1 ( m a) r1221n33ah v in =15v v in =13.2v v in =8v temperature topt ( c) -50 0 50 100 50 60 70 80 90 100 supply current1 ( m a) r1221n33ag v in =15v v in =13.2v v in =8v
r1221n 20 10) soft-start time vs. temperature temperature topt ( c) -50 0 50 100 0 2 4 6 8 10 r1221n33ab soft-start time (msec) l=27 m h v in =4.5v temperature topt ( c) -50 0 50 100 2 4 6 8 10 12 r1221n25xa soft-start time (msec) l=27 m h v in =3.7v 11) delay time for latch-type protection vs. temperature temperature topt ( c) -50 0 50 100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 delay time for latch-type protection (msec) v in =4.5v r1221n33ab temperature topt ( c) -50 0 50 100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 delay time for latch-type protection (msec) v in =3.7v r1221n25xa 12) delay time for reset-type protection vs. temperature temperature topt ( c) -50 0 50 100 0 1 2 3 4 5 delay time for reset-type protection (msec) v in =4.5v r1221n33ah temperature topt ( c) -50 0 50 100 0 1 2 3 4 5 delay time for reset-type protection (msec) v in =4.5v r1221n33ag
r1221n 21 13) vd output delay time vs. temperature v in =8.0v temperature topt ( c) -50 0 50 100 0 1 2 3 4 5 6 vd output delay time (msec) r1221n33ab v in =8.0v temperature topt ( c) -50 0 50 100 0 1 2 3 4 5 6 vd output delay time (msec) r1221n25xa 14) ext"h" output current vs. temperature 15) ext "l" output current vs. temperature temperature topt ( c) -50 0 50 100 0 2 4 6 8 10 12 14 16 ext"h"output current (ma) r1221n33ab temperature topt ( c) -50 0 50 100 0 5 10 15 20 25 30 ext"l" output current (ma) r1221n33ab 16) vd out "l" output current vs. temperature temperature topt ( c) -50 0 50 100 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 vdlc (ma) r1221n33ad
r1221n 22 17) load transient response time (sec) 0 0.0005 0.001 0.1 500 2.4 2.6 2.8 3 3.2 3.4 output voltage v out (v) r1221n33aa v in =5v l=27 m h output current i out (ma) time (sec) 0 0.05 0.1 0.1 500 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 output voltage v out (v) r1221n33aa v in =5v l=27 m h output current i out (ma) time (sec) 0 0.0005 0.001 0.1 500 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 output voltage v out (v) r1221n33ab v in =5v l=27 m h output current i out (ma) time (sec) 0 0.05 0.1 0.1 500 2.6 2.7 2.8 2.9 3 3.1 2 3.3 3.4 3.5 3.6 output voltage v out (v) r1221n33ab v in =5v l=27 m h output current i out (ma) time (sec) 0 0.0005 0.001 0.1 500 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 output voltage v out (v) r1221n33ac v in =5v l=27 m h output current i out (ma) time (sec) 0 0.05 0.1 0.1 500 2.6 2.7 2.8 2.9 3 3.1 2 3.3 3.4 3.5 3.6 output voltage v out (v) r1221n33ac v in =5v l=27 m h output current i out (ma)
r1221n 23 time (sec) 0 0.0005 0.001 0.1 500 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 output voltage v out (v) r1221n33ad v in =5v l=27 m h output current i out (ma) time (sec) 0 0.05 0.1 0.1 500 2.6 2.7 2.8 2.9 3 3.1 2 3.3 3.4 3.5 3.6 output voltage v out (v) r1221n33ad v in =5v l=27 m h output current i out (ma) 18) turn-on waveform time (sec) -0.01 0 0.01 0.02 0 10 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33aa (v in =10v,i out =0ma) l=27 m h ce voltage(v) time (sec) -0.01 0 0.01 0.02 0 5 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33aa (v in =5v,i out =0ma) l=27 m h ce voltage (v) time (sec) -0.01 0 0.01 0.02 0 10 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33ab (v in =10v,i out =0ma) l=27 m h ce voltage(v) time (sec) -0.01 0 0.01 0.02 0 5 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33ab (v in =5v,i out =0ma) l=27 m h ce voltage(v)
r1221n 24 time (sec) -0.01 0 0.01 0.02 0 10 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33aa (v in =10v,i out =100ma) l=27 m h ce voltage(v) time (sec) -0.01 0 0.01 0.02 0 5 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33aa (v in =5v,i out =100ma) l=27 m h ce voltage(v) time (sec) -0.01 0 0.01 0.02 0 10 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33ab (v in =10v,i out =100ma) l=27 m h ce voltage(v) time (sec) -0.01 0 0.01 0.02 0 5 -3.5 -1.5 -1 -2 -2.5 -3 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output voltage v out (v) r1221n33ab (v in =5v,i out =100ma) l=27 m h ce voltage(v)

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