R1225N Datasheet, PDF (4/31 Pages) RICOH electronics devices division – PWM/VFM step-down DC/DC Converter

R1225N
ELECTRICAL CHARACTERISTICS
• R1225Nxx2X (X=A/B/C/D/J/K)
Symbol
Item
Conditions
7RSW ƒ&
Min. Typ. Max. Unit
9,1 2SHUDWLQJ ,QSXW 9ROWDJH

 9
9287 6WHSGRZQ 2XWSXW 9ROWDJH
9,1 9&( 96(7 9 ,287 P$ 96(7×
:KHQ 96(7 ≤ 9 9,1 9&( 9

96(7
96(7×

9
∆9287 6WHSGRZQ 2XWSXW 9ROWDJH
∆7 7HPSHUDWXUH &RHIILFLHQW
ƒ& ≤ 7RSW ≤ ƒ&
“
SSP
ƒ&
IRVF 2VFLOODWRU )UHTXHQF\
9,1 9&( 96(7 9 ,287 P$
:KHQ 96(7 ≤ 9 9,1 9&( 9
-. YHUVLRQ
   N+]
$& YHUVLRQ
  
%' YHUVLRQ
  
∆I26&∆7
2VFLOODWRU )UHTXHQF\
7HPSHUDWXUH &RHIILFLHQW
ƒ& ≤ 7RSW ≤ ƒ&
“
ƒ&
,'' 6XSSO\ &XUUHQW 
9,1 9&( 9287 9
$%-. YHUVLRQ
& YHUVLRQ
' YHUVLRQ




—$


,VWE 6WDQGE\ &XUUHQW
9,1 9 9&( 9 9287 9
  —$
,(;7+ (;7 ´+µ 2XWSXW &XUUHQW
9,1 9 9(;7 9 9287 9
9&( 9
 _ P$
,(;7/ (;7 ´/µ 2XWSXW &XUUHQW
9,1 9 9(;7 9 9287 9
9&( 9


P$
,6: '/< VZLWFK FXUUHQW
9,1 9 9&( 9 9'/< 9
 
P$
,&(+ &( ´+µ ,QSXW &XUUHQW
9,1 9&( 9287 9
  —$
,&(/ &( ´/µ ,QSXW &XUUHQW
9,1 9287 9 9&( 9
 
—$
9&(+ &( ´+µ ,QSXW 9ROWDJH
9,1 9 9287 9

9
9&(/ &( ´/µ ,QSXW 9ROWDJH
9,1 9 9287 9
 9
0D[GW\ 2VFLOODWRU 0D[LPXP 'XW\ &\FOH

9)0GW\ 9)0 'XW\ &\FOH
$%- YHUVLRQ

989/2 89/2 9ROWDJH
9,1 9&( 9 WR 9 9287 9
   9
989/2 89/2 5HOHDVH 9ROWDJH
9,1 9&( 9 WR 9 9287 9
989/2


9
7VWDUW
'HOD\ 7LPH E\ 6RIW6WDUW IXQFWLRQ
9,1 96(7 9 ,287 P$
9&( 9→96(7 9


 PV
7SURW
'HOD\ 7LPH IRU SURWHFWLRQ FLUFXLW
9,1 9&( 96(7 9
9287 96(7 9→9


 PV
4