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| pwm/vfm step-down dc/dc converter 1 no. ea-097-0212 outline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features ? #, )*#!' . & ,.89. ? :'& # ) /'# ## 6 (! #/'# # ? ! # ) && /7'# (9 4;<+ 4;<+ 4;< ? ;,)) # ( (!= > ? ' !' . & , !" #, " ! ) . # #, ) .8? . ? # ('# (! @1 ? ;,1 ' (' !' . & , a > ? 6 "-! ' $) )) # )' !' . & ,(!a !!- b applications ? " ' ) # & --'# #7'!-# + -+% # '-# ' .+ - ? " ' ) ( ! " 7'!-# ? " ' ) ' & & &!!&# r1225n 2 block diagram v in v out ce ext dly gnd pwm/vfm control start func + - + - amp osc vref vref protection soft start chip enable - + uvlo selection guide *# + ' !' % & ,+ && )7'# (+ ! #&)'# #+# !#, (!) * # & 'c7' & # # - " ,# #, ! #'- "# & "d 222 '- code contents #,' !' . & ,e. fg !" #," ! ) .# #, ). ? .! & $,# # ) && /7'# ( g)2 $,# # )! #&/'# # 1 g 4;<+" ./& # % ' : g 4;<+" ./& # % ' g 4;<+" ' ./& # % ' $ g 4;<+" ' ./& # % ' h g9 4;<+" ./& # % ' 3 g9 4;<+" ' ./& # % ' $,# # )!#,(!g) !#,! ) # ij! # r1225n 3 pin configuration sot-23-6w 12 3 ext v in dly 64 (mark side) 5 v out ce gnd pin description pin no. symbol description k 2 #&# $% #e' !' (!f . "'!!&( # $6l #) #,2 #&! ) # ' $&(- !# & #e1 %i;jf m$ m '# # ?. #) # #,' !' . & , absolute maximum ratings symbol item rating unit . . '!!&(. & , . . k #' !' . & , 8. n . . #*#!' . & , 8. n . . . #*#!' . & , 8. n . . . #*#!' . & , 8n . * k #*# ' $%' !' '# a -1 * $6l #' !' '# a -1 "$! # - ! ! #,-! '#, 8n9 b , ,-! '#, 8n b r1225n 4 electrical characteristics ? r1225nxx2x (x=a/b/c/d/j/k) ! ob symbol item conditions min. typ. max. unit . ! #,*#!' . & , 9 . . ! "#' !' . & , . o. n. n.+* o -1 #. .+. o. o . . =9 . . . ? . ? ! "#' !' . & , -! ' )) # b ! 9b a !!- b ) && /7'# ( . o. o. n.+* o -1 #. .+. o. o . h 3% # 1 % # : $% # 9 ? ? ? 4;< ? ) ? && /7'# ( -! ' )) # b ! 9b a > b * '!!&('# . o. o. o9. 1 : h 3% # % # $% # ? 9 @1 * # ('# . o9.+. o .+. o . @1 * ki;j' !' '# . o9.+. op=.+. o9.+ . o9. p -1 * ki6j' !' '# . o9.+. o .+. o .+ . o9. -1 * $6l" '# . o.+. o .+. o . -1 * i;j*#!' '# . o. o. o9. @1 * i6j*#!' '# . o. o9.+. o . @1 . i;j*#!' . & , . o9.+. o . . . i6j*#!' . & , . o9.+. o . . 2 ( && 2-'-$' (( & > ./ ( ./$' (( & 1 : h% # > . 5.6. & , . o. o. .+. o . 9 . . 5.6&. & , . o. o. .+. o . . n . $&(- ( ) )'# # . o. n.+* o -1 . o . . n. - ! $&(-) ! # ' . o. o. n. . o. n. . - r1225n 5 typical application and application hints v in ce ce control ext gnd v out dly c3 + - c4 c2 c1 r1 pmos l load sd g;1 e; f 6 g p e'- +p@;f $ g: ?6 e -f gp@/e# &'-(!f g @/e- ! f g @/e- ! f g #/e- ! f g ? #( '' *+ # ) && "#,'d ? 1 "## & 4 ,-+! ) - # -#&+ ) # ) - ) & '# + ) # ' #' "( #( ' # & !# (# ! "'!!&(+ # -4 i;j&%&- # % & ,&%& ). !# ? ! # )6 (!! # ' ) && "d # -2-'- ' ( ( & # #'& #, # &( -) ! # ' +e) & & f ! # ' " 4 ' "# "/" & #, ! #) "# ##!' ' !' % & , ))# -&&+ ! # ' -(" 4" -&&& '# & ! # )& '+) & *" !# & ' +# & ,#+ *" ! " #; "%+# ) #, *" ! " #+) ! "'!!&( '# ))+) #- '# ) ,-## + -% & ,) . ) - + *-, # %#) ! " # ? 2 #& -! ## & ! & *# -#-< ## # "# -! ## # **#! '&+ ! '& ## . !# " -#-'- ## # 4 , '# #, ')) # # #) '!!&(#,6," #, '# )& " ', ## # )! "&#+## ' # ## # ). *) -! # ) ## # )! "'!!&(,+ % & ,&%& )! " '!!&( ) *)&' ' " " #, '# -( ''# & ! # ) * r1225n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e '&4!- f!'! ) ' #, )) # (" &, & ( 4!!#, )7'# (# '!!#, #'-! # '# ; "%+ ) ' !' % & ,,# #!' % & ,> &+e2. q9?.# . o .f%#) &, '# -( & + *4! ./ - 1 '& + )7'# ( -, + # && #"%) --, '# & !# -# (! & ) *" ./& # % ' ? !) -# )! " ' ' '#, *2 -&( !# '! # !!& ' ( # ## & # ) !!& ' *#! '&+ ,# !!& ' #"( %&' ' % & ,+ '# + # ! " ) -! ## + : ! # # * # 2 ! %&' r1225n 7 how to set the delay time of protection circuit 7' # " & '& &( - )! # ' ) - %&' )#2 #& ! o e*# 7' #+ !/ @/ ' 2 #& ! + # &( -2 + ) +) 2 #& ! & # !/+ "&&# /' +) 2 #& ! %&' ( # @/+ -7' , "&& & #,+# -( ' - ! #/ 2-!&+) ! # ' -(" 4# & + #) ! #-( " 4 *# + # , -!& &(( + ) + &( - -( #2! v in ce ce control ext gnd v out dly c3 + - c4 c2 c1 r1 pmos l sd load operation of step-down dc/dc converter and output current ! "#$ $ #% ,#,(# # ' "#62 # +# , #,( ) - # ' "#62 # //# # &" &#,(& + & " ' !' % & , # #!' % & , # ! #"&& 2!&# " )# ) && "#, ,-g ## '# *6eof)& "+# #,( , # 61 - -# +*6# ) - *6-#eo f *6-2#! ! # # -! e #f )6k !g #62 '# ))+ 4( e$f '# ## 6-# #*6 *6-2+# '# *6 eof)& " !g *6 , '&&(# *6-#) -! ) !#+# $ '# ))+! % # # #' '- +#2 ( & ) *6 - ' )) -# # ',*# +*6 %&') - *6-#eq f *# ) # &( -+ ' !' % & ,-# # ( # &&#, # -! e #f+ " && )7'# (e) f #,-# # # # r1225n 8 ? discontinuous conduction mode and continuous conduction mode -2-'-%&'e*6-2f# -#-'-%&'e*6-#f '# " )& " ', # ' - "#62 '# ## "# '# )) ))# "#*6-2# *6-#+" !# ( ? *d ? *o*6-2 *6-#o. !# 6oe. . f # 6 7' # +o ) o #n )) ' (e>fo # o # ) !# )) *#7' #+. !# 6# e. . f # 6! %&( "# #, ) '# +# #, ) '# // # ' !' '# e* f& %&(-&&+ !#r ))&&' # % ,-*# + #,( , # # ' '#, -! ) ## , # # &( '#, -! ) ))+ ) *6-# - < e*6-#o f #* , '&&(# +%# '&&(+ !# - ))e !#o ))f+# "#* )' # +*6-# -&, #< e*6-#q f) -- ) # #' '- # & - ) # #' '- *# # #' '- +"#7' # &% ) ## '- &' # # + # o . . 7' # # #r # + - # #' '- +# "# #o # + - # #' '- r1225n 9 output current and selection of external components #62ijg e #+!!&'# %&' * + # )6k ! '# ) # ' f . o. ne!n f * n6 * # 7' # #62i//jg 6 * ))o. n. n * 7' # ' 7' # 7' ## &%) ' (+ # e ))n #fo$ + $ oe. n. n * f e. n. ! * f 7' # !!&'# ) && "d * oe. . ! * * f $ ) 6 7' #? #+!4 '# )& " ',6+62+# $) && "d *6-2o* n* 7' #p # *6-2+ # # )#!' # ' !' # & 2 #& -! ## %2!&# # & '& ### & # # #' '- r1225n 10 external components 1. inductor & ## ' !4 '# # 2 *6-2*)&, '# #&& " & '# )& "+-, # ' # '# -4 #) -)) # (" # & '# )# + -&&%&' )6+ &, !!& '# % && " & '# &,# # $ '# -&&+ ) +) &, ' !' ' # +)) # ( #'#,## ' " &,%&' )6# % % 2. diode 5 " & ". e 4( (! --# f# ," #,! %% & , #, '& - #. # '# #, '& 7'& - #*6-2 3. capacitors 1) +' ! " & "e7'%&# # f# ! ( ) & @/) & ! # # ' !!& ) ' !' . & ,+ ) p@/ - %&' ) # &'- (! ! - -# 4. lx transistor "/7' ) * * 4 "#% & , "#, # ' '& )"., #*#!' . & , *# )*#!' . & ,& "+ '# #/ -!& &(+ '/" & " & % & , )) % *)&,& '# # () ( '!!& ## -! # + /" & " # ) , )) # ( *)-&&& '# -#&(# () ( '!!& #+ /" & ", ! () , )) # ( 2-'- # #' ' # '# )/ '& &, #!4 '# +*6-2 r1225n 11 timing chart case 1. set v out voltage >2.1v (set v out voltage>uvlo voltage) v in uvlo voltage uvlo reset ce reset v out set output voltage v out set output voltage v out set output voltage v out set output voltage protection circuit delay time protection circuit delay time latch protection latch protection stable operation stable operation soft start ce ext v out soft start soft start stable operation input voltage rising time -#, "# % #,#,! )#!' % & ,#,+ & ! #,+ ! #, " &, '# + " !#+ & ! #,+#!' % & ,)&&#,+#!' % & , %#,+# & ! #, / +'# &"# #!' % & ,e. f ' !' % & ,+ ' # 4! # # )! # ( # +) . - ( # ' !' % & ,+ ) ! # +"# ) ! # )#+ ! # - & *) &, '# )& " ', ' ' ) #+k,#&,# '#, &( - )! # ' e '# %&' !# # ' f 1) &( -!+ & ! #" 4+ k,#&"&& i;j+ # ' !' "&& '# )) & & ! #+#!' % & , '& 7'& & " #5.6&%&+ " e# '# )) ' " # '# #,#f*# -#, , %+& & )'# #&< " , #&) -i6j i;j1) - %#, ' )&, '# # " + ) ! # # ) ) -+ ! #"&& 4 & *) . -& " # . + ' #-&, '# # #+ ! # ' -( ( " 4+ ) +) &( - )! # ' +k"&& i;j# ' !' '# )) /' +) . & " #5.6% & ,+ ' # "&& !! (5.6)'# # 1) +). +'# &"# . ' !' % & ,+ ' # 4! # # ) ! # ( #) . - ( # ' !' % & ,+ ) ! # +"# ) ! # )#+ ! # - & r1225n 12 case 2. set v out voltage 2.0v (set v out voltage < uvlo voltage) v in uvlo voltage uvlo voltage uvlo voltage uvlo reset reset with ce v out set output voltage v out set output voltage protection circuit delay time latch protection stable operation stable operation soft start ce ext v out soft start soft start stable operation input voltage rising time -#, "# % #,#,! )#!' % & ,#,+ & ! #,+ ! #, " &, '# + " !#+ & ! #,+#!' % & ,)&&#,+#!' % & , %#,+# & ! #, / +'# &"# #!' % & ,e. f 5.6% & ,+ ' # 4! # # )! # ( # +) . - ( # 5.6% & ,+ ) ! # +"# ) ! #)# + ! # - & *) &, '# )& " ', ' ' ) #+k,#&,# '#, &( - )! # ' e '# %&' !# # ' f 1) &( -!+ & ! #" 4+ k,#&"&& i;j+ # ' !' "&& '# )) & & ! #+#!' % & , '& 7'& & " #5.6&%&+ " e# '# )) ' " # '# #,#f*# -#, , %+& & )'# #&< " , #&) -i6j i;j1) - %#, ' )&, '# # " + ) ! # # ) ) -+ ! #"&& 4 & /' +) . & " #5.6% & ,+ ' # "&& !! (5.6)'# # 1) +). +'# &"# . 5.6 % & ,+ ' # 4! # # ) ! # ( #) . - ( # 5.6 % & ,+ ) ! # + "# ) ! # )# + ! # - & r1225n 13 test circuits a) output voltage, oscillator frequency, ce ?h? input voltage, ce ?l? input voltage, soft-start time ext gnd v out v in dly ce c1 d1 + - l1 oscilloscope v c2 + - pmos b) supply current 1 c) standby current ext gnd v out v in dly ce a ext gnd v out v in dly ce a d) ext ? h ? output current e) ext ? l ? output current ext gnd v out v in dly ce a ext gnd v out v in dly ce a f) dly switch current ext gnd v out v in dly ce a r1225n 14 g) ce ? h ? input current, ce ? l ? input current h) output delay time for protection circuit ext gnd v out v in dly ce a ext gnd v out v in dly ce c2 c3 + - oscilloscope g;1 e; f 6 g$ p e'- +p@;f $ g:=$e -f gp@/e# &'-(!f gp@/e# &'-(!f g #/e- (!f typical characteristics 1&- && )-2 ! ) && "#, + ) ) 1) efficiency vs. output current r1225n182a (v in =3.3v) cdrh127-10uh r1225n182a (v in =5.0v) cdrh127-10uh 100 30 40 50 60 70 80 90 20 10 0 output current i out (ma) efficiency (%) 0.1 1 10 100 1000 10000 output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n182b (v in =3.3v) cdrh127-10uh r1225n182b (v in =5.0v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 15 r1225n182c (v in =3.3v) cdrh127-10uh r1225n182c (v in =5.0v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n182c (v in =12v) cdrh127-10uh r1225n182d (v in =3.3v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n182d (v in =5.0v) cdrh127-10uh r1225n182d (v in =12v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 16 r1225n182j (v in =3.3v) cdrh127-27uh r1225n182j (v in =5.0v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n182k (v in =3.3v) cdrh127-27uh r1225n182k (v in =5.0v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n182k (v in =12v) cdrh127-27uh r1225n332a (v in =4.8v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 17 r1225n332a (v in =7.0v) cdrh127-10uh r1225n332b (v in =4.8v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n332b (v in =7.0v) cdrh127-10uh r1225n332c (v in =4.8v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n332c (v in =12v) cdrh127-10uh r1225n332c (v in =15v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 18 r1225n332d (v in =4.8v) cdrh127-10uh r1225n332d (v in =12v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n332d (v in =15v) cdrh127-10uh r1225n332k (v in =4.8v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n332k (v in =12v) cdrh127-27uh r1225n332k (v in =15v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 19 r1225n502a (v in =6.5v) cdrh127-10uh r1225n502a (v in =10v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n502b (v in =6.5v) cdrh127-10uh r1225n502b (v in =10v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n502c (v in =6.5v) cdrh127-10uh r1225n502c (v in =12v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 20 r1225n502c (v in =15v) cdrh127-10uh r1225n502d (v in =6.5v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n502d (v in =12v) cdrh127-10uh r1225n502d (v in =15v) cdrh127-10uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n502j (v in =6.5v) cdrh127-27uh r1225n502j (v in =10v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n 21 r1225n502k (v in =6.5v) cdrh127-27uh r1225n502k (v in =12v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) r1225n502k (v in =15v) cdrh127-27uh output current i out (ma) 0.1 1 10 100 1000 10000 100 30 40 50 60 70 80 90 20 10 0 efficiency (%) 2) ripple voltage vs. output current r1225n182a l=10uh r1225n182b l=10uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in =3.3v v in =5.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in =3.3v v in =5.0v r1225n 22 r1225n182c l=10uh r1225n182d l=10uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 3.3v v in = 5.0v v in =12.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 3.3v v in = 5.0v v in =12.0v r1225n182j l=27uh r1225n182k l=27uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in =3.3v v in =5.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 3.3v v in = 5.0v v in =12.0v r1225n332a l=10uh r1225n332b l=10uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in =4.8v v in =7.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in =4.8v v in =7.0v r1225n 23 r1225n332c l=10uh r1225n332d l=10uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 4.8v v in =12.0v v in =15.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 4.8v v in =12.0v v in =15.0v r1225n332j l=27uh r1225n332k l=27uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in =4.8v v in =7.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 4.8v v in =12.0v v in =15.0v r1225n502a l=10uh r1225n502b l=10uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 6.5v v in =10.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 6.5v v in =10.0v r1225n 24 r1225n502c l=10uh r1225n502d l=10uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 6.5v v in =12.0v v in =15.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 6.5v v in =12.0v v in =15.0v r1225n502j l=27uh r1225n502k l=27uh 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 6.5v v in =10.0v 10 20 30 40 50 60 70 0 output current i out (ma) ripple voltage vrpp(mv) 0.1 1 10 100 1000 10000 v in = 6.5v v in =12.0v v in =15.0v 3) input voltage vs. output voltage r1225n182a l=10uh r1225n182b l=10uh 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1.60 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1.60 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma r1225n 25 r1225n182c l=10uh r1225n182d l=10uh 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1.60 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1.60 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma r1225n182j l=27uh r1225n182k l=27uh 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1.60 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1.60 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma r1225n332a l=10uh r1225n332b l=10uh 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma r1225n 26 r1225n332c l=10uh r1225n332d l=10uh 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma r1225n332j l=27uh r1225n332k l=27uh 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 input voltage v in (v) output voltage v out (v) 0 5 10 15 20 1ma 500ma 4) output voltage vs. output current r1225n182a l=10uh r1225n182b l=10uh 1.830 1.810 1.790 1.770 1.850 1.750 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in =3.3v v in =5.0v 1.830 1.810 1.790 1.770 1.850 1.750 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in =3.3v v in =5.0v r1225n 27 r1225n182c l=10uh r1225n182d l=10uh 1.830 1.810 1.790 1.770 1.850 1.750 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in = 5.0v v in =12.0v v in = 3.3v 1.830 1.810 1.790 1.770 1.850 1.750 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in = 5.0v v in =12.0v v in = 3.3v r1225n182j l=27uh r1225n182k l=27uh 1.830 1.810 1.790 1.770 1.850 1.750 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in =5.0v v in =3.3v 1.830 1.810 1.790 1.770 1.850 1.750 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in = 5.0v v in =12.0v v in = 3.3v r1225n332a l=10uh r1225n332b l=10uh 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.40 3.20 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in =4.8v v in =7.0v 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.400 3.200 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in =4.8v v in =7.0v r1225n 28 r1225n332c l=10uh r1225n332d l=10uh output current i out (ma) 0.1 1 10 100 1000 10000 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.400 3.200 output voltage v out (v) v in =12.0v v in =15.0v v in = 4.8v output current i out (ma) 0.1 1 10 100 1000 10000 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.400 3.200 output voltage v out (v) v in =12.0v v in =15.0v v in = 4.8v r1225n332j l=27uh r1225n332k l=27uh 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.400 3.200 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in =4.8v v in =7.0v output current i out (ma) 0.1 1 10 100 1000 10000 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.400 3.200 output voltage v out (v) v in =12.0v v in =15.0v v in = 4.8v r1225n502a l=10uh r1225n502b l=10uh 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 5.100 4.900 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in = 6.5v v in =10.0v 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 5.100 4.900 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in = 6.5v v in =10.0v r1225n 29 r1225n502c l=10uh r1225n502d l=10uh output current i out (ma) 0.1 1 10 100 1000 10000 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 5.100 4.900 output voltage v out (v) v in =12.0v v in =15.0v v in = 6.5v output current i out (ma) 0.1 1 10 100 1000 10000 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 5.100 4.900 output voltage v out (v) v in =12.0v v in =15.0v v in = 6.5v r1225n502j l=27uh r1225n502k l=27uh 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 5.100 4.900 output current i out (ma) output voltage v out (v) 0.1 1 10 100 1000 10000 v in = 6.5v v in =10.0v output current i out (ma) 0.1 1 10 100 1000 10000 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 5.100 4.900 output voltage v out (v) v in =12.0v v in =15.0v v in = 6.5v 5) load transient response r1225n332a l=10uh v in =4.8v r1225n332a l=10uh v in =4.8v time(sec) -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 3.50 2.50 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) time(sec) -0.05 0.00 0.05 0.10 0.15 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output current i out (ma) 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.50 3.00 output voltage v out (v) r1225n 30 r1225n332a l=10uh v in =7v r1225n332a l=10uh v in =7v -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 3.50 2.50 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) time(sec) time(sec) -0.05 0.00 0.05 0.10 0.15 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output current i out (ma) 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.50 3.00 output voltage v out (v) r1225n332b l=10uh v in =4.8v r1225n332b l=10uh v in =4.8v -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 3.50 2.50 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) time(sec) time(sec) -0.04 -0.02 0 0.02 0.04 0.06 0.08 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.50 3.00 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) r1225n332b l=10uh v in =7v r1225n332b l=10uh v in =7v -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 3.50 2.50 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) time(sec) time(sec) -0.04 -0.02 0 0.02 0.04 0.06 0.08 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.50 3.00 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) r1225n 31 r1225n332j l=27uh v in =4.8v r1225n332j l=27uh v in =4.8v -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 3.50 2.50 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) time(sec) time(sec) -0.04 -0.02 0 0.02 0.04 0.06 0.08 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.50 3.00 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) r1225n332j l=10uh v in =7v r1225n332j l=27uh v in =7v -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 3.50 2.50 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) time(sec) time(sec) -0.04 -0.02 0 0.02 0.04 0.06 0.08 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.50 3.00 1800 1600 1400 1200 1000 800 600 400 200 2000 0 output voltage v out (v) output current i out (ma) |
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