R1223N502G-TL-FA [RICOH]
Switching Controller, 360kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN;
| 型号： | R1223N502G-TL-FA |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Controller, 360kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN 开关 光电二极管 |
| 文件： | 总21页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PWM/VFM step-down DC/DC Converter
Controller
NO. EA-065-0204
5ꢀꢁꢁꢂ1ꢃ6(5,(6
OUTLINE
7KHꢀ5ꢁꢂꢂꢃ1ꢀ6HULHVꢀDUHꢀ&026ꢄEDVHGꢀ3:0ꢀVWHSꢄGRZQꢀ'&ꢅ'&ꢀ&RQYHUWHUꢀFRQWUROOHUVꢀZLWKꢀORZꢀVXSSO\ꢀFXUUHQWꢆ
(DFKꢀRIꢀWKHVHꢀ,&VꢀFRQVLVWVꢀRIꢀDQꢀRVFLOODWRUꢇꢀDꢀ3:0ꢀFRQWUROꢀFLUFXLWꢇꢀDꢀUHIHUHQFHꢀYROWDJHꢀXQLWꢇꢀDQꢀHUURUꢀDPSOLILHUꢇꢀDꢀVRIWꢄ
VWDUWꢀFLUFXLWꢇꢀDꢀSURWHFWLRQꢀFLUFXLWꢇꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀDꢀFKLSꢀHQDEOHꢀFLUFXLWꢇꢀDQGꢀUHVLVWRUVꢀIRUꢀYROWDJHꢀGHWHFꢄ
WLRQꢆꢀ$ꢀORZꢀULSSOHꢇꢀKLJKꢀHIILFLHQF\ꢀVWHSꢄGRZQꢀ'&ꢅ'&ꢀFRQYHUWHUꢀFDQꢀEHꢀHDVLO\ꢀFRPSRVHGꢀRIꢀWKLVꢀ,&ꢀZLWKꢀRQO\ꢀIRXUꢀH[WHUꢄ
QDOꢀFRPSRQHQWVꢇꢀRUꢀDꢀSRZHUꢄWUDQVLVWRUꢇꢀDQꢀLQGXFWRUꢇꢀDꢀGLRGHꢀDQGꢀDꢀFDSDFLWRUꢆ
:LWKꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀZKHQꢀWKHꢀORDGꢀFXUUHQWꢀLVꢀVPDOOꢇꢀWKHꢀRSHUDWLRQꢀLVꢀDXWRPDWLFDOO\ꢀVZLWFKLQJꢀLQWR
WKHꢀ9)0ꢀRVFLOODWRUꢀIURPꢀ3:0ꢀRVFLOODWRUꢇꢀWKHUHIRUHꢀWKHꢀHIILFLHQF\ꢀDWꢀVPDOOꢀORDGꢀFXUUHQWꢀLVꢀLPSURYHGꢆꢀ7KHꢀ5ꢁꢂꢂꢃ1[[[%
W\SHꢇꢀZKLFKꢀLVꢀZLWKRXWꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀLVꢀDOVRꢀDYDLODEOHꢆ
,IꢀWKHꢀWHUPꢀRIꢀPD[LPXPꢀGXW\ꢀF\FOHꢀNHHSVꢀRQꢀDꢀFHUWDLQꢀWLPHꢇꢀWKHꢀHPEHGGHGꢀSURWHFWLRQꢀFLUFXLWꢀZRUNVꢆꢀ7KHUHꢀDUHꢀWZR
W\SHVꢀRIꢀSURWHFWLRQꢀIXQFWLRQꢆꢀ2QHꢀLVꢀODWFKꢄW\SHꢀSURWHFWLRQꢀFLUFXLWꢇꢀDQGꢀLWꢀZRUNVꢀWRꢀODWFKꢀDQꢀH[WHUQDOꢀ3RZHUꢀ026)(7
ZLWKꢀNHHSLQJꢀLWꢀGLVDEOHꢆꢀ7RꢀUHOHDVHꢀWKHꢀFRQGLWLRQꢀRIꢀSURWHFWLRQꢇꢀDIWHUꢀGLVDEOHꢀWKLVꢀ,&ꢀZLWKꢀDꢀFKLSꢀHQDEOHꢀFLUFXLWꢇꢀHQDEOHꢀLW
DJDLQꢇꢀRUꢀUHVWDUWꢀWKLVꢀ,&ꢀZLWKꢀSRZHUꢄRQꢆꢀ7KHꢀRWKHUꢀLVꢀ5HVHWꢄW\SHꢀSURWHFWLRQꢀFLUFXLWꢇꢀDQGꢀLWꢀZRUNVꢀWRꢀUHVWDUWꢀWKHꢀRSHUDWLRQ
ZLWKꢀVRIWꢄVWDUWꢀDQGꢀUHSHDWꢀWKLVꢀRSHUDWLRQꢀXQWLOꢀPD[LPXPꢀGXW\ꢀF\FOHꢀFRQGLWLRQꢀLVꢀUHOHDVHGꢆ
(LWKHUꢀRIꢀWKHVHꢀSURWHFWLRQꢀFLUFXLWVꢀFDQꢀEHꢀGHVLJQDWHGꢀE\ꢀXVHUVꢈꢀUHTXHVWꢆ
FEATURES
• 5DQJHꢀRIꢀ,QSXWꢀ9ROWDJHꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ ꢂꢆꢃ9∼ꢁꢃꢆꢂ9
• %XLOWꢄLQꢀ6RIWꢄVWDUWꢀ)XQFWLRQꢀDQGꢀ7ZRꢀFKRLFHVꢀRIꢀ3URWHFWLRQꢀ)XQFWLRQꢀꢉ/DWFKꢄW\SHꢀRUꢀ5HVHWꢀW\SH4
• 7ZRꢀFKRLFHVꢀRIꢀ2VFLOODWRUꢀ)UHTXHQF\ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ ꢃꢊꢊN+]ꢇꢀꢋꢊꢊN+]
• +LJKꢀ(IILFLHQF\ ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ 7\Sꢆꢀꢌꢊꢍ
• 2XWSXWꢀ9ROWDJH
6WHSZLVHꢀ6HWWLQJꢀZLWKꢀDꢀVWHSꢀRIꢀꢊꢆꢁ9ꢀLQꢀWKHꢀUDQJHꢀRIꢀꢁꢆꢋ9ꢀ∼
ꢋꢆꢊ9
• 6WDQGE\ꢀ&XUUHQW ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ 7\Sꢆꢀꢊ$
• +LJKꢀ$FFXUDF\ꢀ2XWSXWꢀ9ROWDJH ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ ꢂꢆꢊꢍ
• /RZꢀ7HPSHUDWXUHꢄ'ULIWꢀ&RHIILFLHQWꢀRIꢀ2XWSXWꢀ9ROWDJHꢆꢆꢆꢆꢆ 7\SꢆꢀꢁꢊꢊSSPꢅ&
APPLICATIONS
• 3RZHUꢀVRXUFHꢀIRUꢀKDQGꢄKHOGꢀFRPPXQLFDWLRQꢀHTXLSPHQWꢇꢀFDPHUDVꢇꢀYLGHRꢀLQVWUXPHQWVꢀVXFKꢀDVꢀ9&5VꢇꢀFDPFRUGHUVꢆ
• 3RZHUꢀVRXUFHꢀIRUꢀEDWWHU\ꢄSRZHUHGꢀHTXLSPHQWꢆ
• 3RZHUꢀVRXUFHꢀIRUꢀKRXVHKROGꢀHOHFWULFDOꢀDSSOLDQFHVꢆ
1
R1223N
BLOCK DIAGRAM
OSC
V
IN
V
OUT
EXT
Vref
PWM/VFM
CONTROL
Protection
Soft Start
Chip Enable
CE
GND
SELECTION GUIDE
,QꢀWKHꢀ5ꢁꢂꢂꢃ1ꢀ6HULHVꢇꢀWKHꢀRXWSXWꢀYROWDJHꢇꢀWKHꢀRVFLOODWRUꢀIUHTXHQF\ꢇꢀWKHꢀRSWLRQDOꢀIXQFWLRQꢇꢀDQGꢀWKHꢀWDSLQJꢀW\SHꢀIRUꢀWKH
,&VꢀFDQꢀEHꢀVHOHFWHGꢀDWꢀWKHꢀXVHUꢈVꢀUHTXHVWꢆ
7KHꢀVHOHFWLRQꢀFDQꢀEHꢀPDGHꢀE\ꢀGHVLJQDWLQJꢀWKHꢀSDUWꢀQXPEHUꢀDVꢀVKRZQꢀEHORZꢎ
5ꢁꢂꢂꢃ1[[[[ꢄ[[
↑↑↑ ↑
D EF G
Code
Contents
6HWWLQJꢀ2XWSXWꢀ9ROWDJHꢀꢉ92874ꢏ
D
6WHSZLVHꢀVHWWLQJꢀZLWKꢀDꢀVWHSꢀRIꢀꢊꢆꢁ9ꢀLQꢀWKHꢀUDQJHꢀRIꢀꢁꢆꢋ9ꢀWRꢀꢋꢆꢊ9ꢀLVꢀSRVVLEOHꢆ
'HVLJQDWLRQꢀRIꢀ2VFLOODWRUꢀ)UHTXHQF\
ꢂ ꢏꢀIL[HG
E
F
G
'HVLJQDWLRQꢀRIꢀ2SWLRQDOꢀ)XQFWLRQ
$ ꢏꢀꢃꢊꢊN+]ꢇꢀZLWKꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ/DWFKꢄW\SHꢀSURWHFWLRQ
% ꢏꢀꢋꢊꢊꢀN+]ꢇꢀZLWKꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ/DWFKꢄW\SHꢀSURWHFWLRQ
& ꢏꢀꢃꢊꢊN+]ꢇꢀZLWKRXWꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ/DWFKꢄW\SHꢀSURWHFWLRQ
' ꢏꢀꢋꢊꢊN+]ꢇꢀZLWKRXWꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ/DWFKꢄW\SHꢀSURWHFWLRQ
( ꢏꢀꢃꢊꢊN+]ꢇꢀZLWKꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ5HVHWꢄW\SHꢀSURWHFWLRQ
) ꢏꢀꢋꢊꢊꢀN+]ꢇꢀZLWKꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ5HVHWꢄW\SHꢀSURWHFWLRQ
* ꢏꢀꢃꢊꢊN+]ꢇꢀZLWKRXWꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ5HVHWꢄW\SHꢀSURWHFWLRQ
+ ꢏꢀꢋꢊꢊN+]ꢇꢀZLWKRXWꢀDꢀ3:0ꢅ9)0ꢀDOWHUQDWLYHꢀFLUFXLWꢇꢀ5HVHWꢄW\SHꢀSURWHFWLRQ
'HVLJQDWLRQꢀRIꢀ7DSLQJꢀ7\SHꢎꢀꢀ([ꢆꢀꢏ75ꢇ7/ꢀꢉUHIHUꢀWRꢀ7DSLQJꢀ6SHFLILFDWLRQ4
´75µꢀLVꢀSUHVFULEHGꢀDVꢀDꢀVWDQGDUGꢆ
2
R1223N
PIN CONFIGURATION
SOT-23-5
5
4
V
IN
EXT
(mark side)
CE GND VOUT
1
2
3
PIN DESCRIPTION
Pin No.
Symbol
Description
Hꢀ3LQ
ꢁ
ꢂ
ꢃ
ꢐ
ꢋ
&(
&KLSꢀ(QDEO
*URXQGꢀ3LQ
*1'
9287
(;7
9,1
3LQꢀIRUꢀ0RQLWRULQJꢀ2XWSXWꢀ9ROWDJH
([WHUQDOꢀ7UDQVLVWRUꢀ'ULYHꢀ3LQ
3RZHUꢀ6XSSO\ꢀ3LQ
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
ꢁꢋ
Unit
9
9,1
9,1ꢀ6XSSO\ꢀ9ROWDJH
9(;7
9&(
(;7ꢀ3LQꢀ2XWSXWꢀ9ROWDJH
&(ꢀ3LQꢀ,QSXWꢀ9ROWDJH
ꢄꢊꢆꢃ∼9,1ꢑꢊꢆꢃ
ꢄꢊꢆꢃ∼9,1ꢑꢊꢆꢃ
ꢄꢊꢆꢃ∼9,1ꢑꢊꢆꢃ
ꢂꢋ
9
9
9287
,(;7
9287ꢀ3LQꢀ,QSXWꢀ9ROWDJH
9
(;7ꢀ3LQꢀ,QGXFWRUꢀ'ULYHꢀ2XWSXWꢀ&XUUHQW
3RZHUꢀ'LVVLSDWLRQ
P$
P:
&
&
3'
ꢂꢋꢊ
7RSW
7VWJ
2SHUDWLQJꢀ7HPSHUDWXUHꢀ5DQJH
6WRUDJHꢀ7HPSHUDWXUHꢀ5DQJH
ꢄꢐꢊ∼ꢑꢒꢋ
ꢄꢋꢋ∼ꢑꢁꢂꢋ
3
R1223N
ELECTRICAL CHARACTERISTICS
• R1223Nxx2A (,C,E,G) Output Voltage : Vo
ꢉ7RSW ꢂꢋ&4
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
9,1
2SHUDWLQJꢀ,QSXWꢀ9ROWDJH
ꢂꢆꢃ
ꢁꢃꢆꢂ
9
9,1 9&( 9Rꢑꢁꢆꢂ ꢇ
,287 ꢄꢁꢊP$
9R×
ꢊꢆꢌꢒ
9R×
ꢁꢆꢊꢂ
9287
∆9287ꢅ∆7
IRVF
6WHSꢄGRZQꢀ2XWSXWꢀ9ROWDJH
9R
9
6WHSꢄGRZQꢀ2XWSXWꢀ9ROWDJH
7HPSHUDWXUHꢀ&RHIILFLHQW
ꢄꢐꢊ&ꢀ≤ꢀ7RSWꢀ≤ꢀꢒꢋ&
ꢁꢊꢊ
ꢃꢊꢊ
SSPꢅ&
N+]
9,1 9&( 9Rꢑꢁꢆꢂ ꢇ
,287 ꢄꢁꢊꢊP$
2VFLOODWRUꢀ)UHTXHQF\
ꢂꢐꢊ
ꢃꢓꢊ
2VFLOODWRUꢀ)UHTXHQF\
∆IRVFꢅ∆7
ꢄꢐꢊ&ꢀ≤ꢀ7RSWꢀ≤ꢀꢒꢋ&
ꢊꢆꢃ
ꢍꢅ&
7HPSHUDWXUHꢀ&RHIILFLHQW
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢁꢃꢆꢂ ꢇ
9287 ꢁꢃꢆꢂ9
,''ꢀ
,VWE
6XSSO\ꢀ&XUUHQWꢁ
ꢁꢊꢊ
ꢊꢆꢊ
ꢄꢁꢊ
ꢁꢓꢊ
ꢊꢆꢋ
ꢄꢓ
$
$
6WDQGE\ꢀ&XUUHQW
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢊ ꢇꢀ9287 ꢊ9
9,1 ꢒ ꢇꢀ9(;7 ꢔꢆꢌ ꢇꢀ9287 ꢒ ꢇ
9&( ꢒ9
,(;7+
(;7ꢀ´+µꢀ2XWSXWꢀ&XUUHQW
P$
9,1 ꢒ ꢇꢀ9(;7 ꢊꢆꢁ ꢇꢀ9287 ꢊ ꢇ
9&( ꢒ9
,(;7/
,&(+
,&(/
(;7ꢀ´/µꢀ2XWSXWꢀ&XUUHQW
&(ꢀ´+µꢀ,QSXWꢀ&XUUHQW
&(ꢀ´/µꢀ,QSXWꢀ&XUUHQW
ꢁꢊ
ꢂꢊ
ꢊꢆꢊ
ꢊꢆꢊ
P$
$
$
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢁꢃꢆꢂ ꢇ
9287 ꢁꢃꢆꢂ9
ꢊꢆꢋ
ꢁꢆꢂ
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢊ ꢇ
9287 ꢁꢃꢆꢂ9
ꢄꢊꢆꢋ
9&(+
9&(/
&(ꢀ´+µꢀ,QSXWꢀ9ROWDJH
&(ꢀ´/µꢀ,QSXWꢀ9ROWDJH
9,1 ꢒ ꢇꢀ9287 ꢊ9→ꢁꢆꢋ9
9,1 ꢒ ꢇꢀ9287 ꢁꢆꢋ9→ꢊ9
ꢊꢆꢒ
ꢊꢆꢒ
9
9
ꢊꢆꢃ
2VFLOODWRUꢀ0D[LPXPꢀ'XW\
&\FOH
0D[GW\
ꢁꢊꢊ
ꢍ
ꢍ
9)0GW\ 9)0ꢀ'XW\ꢀ&\FOH
RQO\ꢀIRUꢀ$ꢇꢀ(ꢀYHUVLRQ
ꢂꢋ
ꢁꢊ
9,1 ꢀ9Rꢑꢁꢆꢂ ꢇ
'HOD\ꢀ7LPHꢀE\ꢀ6RIWꢄ6WDUW
7VWDU W
7SURW
9&( ꢊ9→9Rꢑꢁꢆꢂ9
VSHFLILHGꢀDWꢀꢒꢊꢍꢀIRUꢀULVLQJꢀHGJH
ꢋ
ꢁ
ꢁꢓ
ꢋ
PV
PV
IXQFWLRQ
'HOD\ꢀ7LPHꢀIRUꢀSURWHFWLRQ
FLUFXLW
9,1 9&( 9Rꢑꢁꢆꢂ9
ꢃ
9287 9Rꢑꢁꢆꢂ9→ꢊ9
4
R1223N
• R1223Nxx2B (,D,F,H) Output Voltage : Vo
ꢉ7RSW ꢂꢋ&4
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
9,1
2SHUDWLQJꢀ,QSXWꢀ9ROWDJH
ꢂꢆꢃ
ꢁꢃꢆꢂ
9
9,1 9&( 9Rꢑꢁꢆꢂ ꢇ
,287 ꢄꢁꢊP$
9R×
ꢊꢆꢌꢒ
9R×
ꢁꢆꢊꢂ
9287
∆9287ꢅ∆7
)RVF
6WHSꢄGRZQꢀ2XWSXWꢀ9ROWDJH
9R
9
6WHSꢄGRZQꢀ2XWSXWꢀ9ROWDJH
7HPSHUDWXUHꢀ&RHIILFLHQW
ꢄꢐꢊ&ꢀ≤ꢀ7RSWꢀ≤ꢀꢒꢋ&
ꢁꢊꢊ
ꢋꢊꢊ
SSPꢅ&
N+]
9,1 9&( 9Rꢑꢁꢆꢂ ꢇ
,287 ꢄꢁꢊꢊP$
2VFLOODWRUꢀ)UHTXHQF\
ꢐꢊꢊ
ꢓꢊꢊ
2VFLOODWRUꢀ)UHTXHQF\
∆IRVFꢅ∆7
ꢄꢐꢊ&ꢀ≤ꢀ7RSWꢀ≤ꢀꢒꢋ&
ꢊꢆꢃ
ꢍꢅ&
7HPSHUDWXUHꢀ&RHIILFLHQW
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢁꢃꢆꢂ ꢇ
9287 ꢁꢃꢆꢂ9
,''ꢀ
,VWE
6XSSO\ꢀ&XUUHQWꢁ
ꢁꢐꢊ
ꢊꢆꢊ
ꢄꢁꢊ
ꢂꢊꢊ
ꢊꢆꢋ
ꢄꢓ
$
$
6WDQGE\ꢀ&XUUHQW
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢊ ꢇꢀ9287 ꢊ9
9,1 ꢒ ꢇꢀ9(;7 ꢔꢆꢌ ꢇꢀ9287 ꢒ ꢇ
9&( ꢒ9
,(;7+
(;7ꢀ´+µꢀ2XWSXWꢀ&XUUHQW
P$
9,1 ꢒ ꢇꢀ9(;7 ꢊꢆꢁ ꢇꢀ9287 ꢊ ꢇ
9&( ꢒ9
,(;7/
,&(+
,&(/
(;7ꢀ´/µꢀ2XWSXWꢀ&XUUHQW
&(ꢀ´+µꢀ,QSXWꢀ&XUUHQW
&(ꢀ´/µꢀ,QSXWꢀ&XUUHQW
ꢁꢊ
ꢂꢊ
ꢊꢆꢊ
ꢊꢆꢊ
P$
$
$
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢁꢃꢆꢂ ꢇ
9287 ꢁꢃꢆꢂ9
ꢊꢆꢋ
ꢁꢆꢂ
9,1 ꢁꢃꢆꢂ ꢇꢀ9&( ꢊ ꢇ
9287 ꢁꢃꢆꢂ9
ꢄꢊꢆꢋ
9&(+
9&(/
&(ꢀ´+µꢀ,QSXWꢀ9ROWDJH
&(ꢀ´/µꢀ,QSXWꢀ9ROWDJH
9,1 ꢒ ꢇꢀ9287 ꢊ9→ꢁꢆꢋ9
9,1 ꢒ ꢇꢀ9287 ꢁꢆꢋ9→ꢊ9
ꢊꢆꢒ
ꢊꢆꢒ
9
9
ꢊꢆꢃ
2VFLOODWRUꢀ0D[LPXPꢀ'XW\
&\FOH
0D[GW\
ꢁꢊꢊ
ꢍ
ꢍ
9)0GW\ 9)0ꢀ'XW\ꢀ&\FOH
RQO\ꢀIRUꢀ%ꢇꢀ)ꢀYHUVLRQ
ꢂꢋ
ꢓ
9,1 9Rꢑꢁꢆꢂ ꢇ
'HOD\ꢀ7LPHꢀE\ꢀ6RIWꢄ6WDUW
7VWDU W
7SURW
9&( ꢊ9→9Rꢑꢁꢆꢂ9
VSHFLILHGꢀDWꢀꢒꢊꢍꢀIRUꢀULVLQJꢀHGJH
ꢃ
ꢁ
ꢁꢊ
ꢐ
PV
PV
IXQFWLRQ
'HOD\ꢀ7LPHꢀIRUꢀSURWHFWLRQ
FLUFXLW
9,1 9&( 9Rꢑꢁꢆꢂ9
ꢂ
9287 9Rꢑꢁꢆꢂ9→ꢊ9
5
R1223N
TEST CIRCUITS
A)
E)
F)
G)
4
L
PMOS
5
1
3
2
4
5
3
2
V
IN
V
A
CL
V
IN
SD
1
C
IN
OSCILLOSCOPE
B)
4
L
PMOS
5
1
3
2
A
4
VIN
5
1
3
2
V
CIN
C
IN
C
L
V
IN
SD
OSCILLOSCOPE
OSCILLOSCOPE
C)
4
5
1
3
2
A
4
5
1
3
V
IN
VIN
VOUT
2
D)
A
V
EXT
4
5
3
V
IN
V
OUT
1
2
7KHꢀW\SLFDOꢀFKDUDFWHULVWLFVꢀZHUHꢀREWDLQHGꢀE\ꢀXVHꢀRIꢀWKHVHꢀWHVWꢀFLUFXLWVꢆ
7HVWꢀ&LUFXLWꢀ$ꢏꢀ7\SLFDOꢀFKDUDFWHULVWLFVꢀꢁ4ꢇꢀꢂ4ꢇꢀꢃ4ꢇꢀꢐ4ꢇꢀꢋ4ꢇꢀꢓ4ꢇꢀꢔ4
7HVWꢀ&LUFXLWꢀ%ꢏꢀ7\SLFDOꢀFKDUDFWHULVWLFVꢀꢒ4
6
R1223N
7HVWꢀ&LUFXLWꢀ&ꢏꢀ6WDQGE\ꢀ&XUUHQW
7HVWꢀ&LUFXLWꢀ'ꢏꢀ7\SLFDOꢀFKDUDFWHULVWLFVꢀꢁꢂ4ꢇꢀꢁꢃ4
7HVWꢀ&LUFXLWꢀ(ꢏꢀ&(ꢀLQSXWꢀFXUUHQWꢀ´+µꢀDQGꢀ´/µ
7HVWꢀ&LUFXLWꢀ) ꢏꢀ7\SLFDOꢀFKDUDFWHULVWLFVꢀꢌ4
7HVWꢀ&LUFXLWꢀ*ꢏꢀ7\SLFDOꢀFKDUDFWHULVWLFVꢀꢁꢊ4ꢇꢀꢁꢁ4
TYPICAL APPLICATIONS AND APPLICATION HINTS
PMOS
L
VIN
V
OUT
EXT
Load
C
OUT
SD1
CE
GND
CIN
CE CONTROL
3026ꢀꢏꢀ+$7ꢁꢊꢂꢊ5ꢀꢉ+LWDFKL4ꢇꢀ6Lꢃꢐꢐꢃ'9ꢀꢉ6LOLFRQL[4 /
6'ꢁ ꢏꢀ5%ꢐꢌꢁ'ꢀꢉ5RKP4
ꢏꢀ&'ꢁꢊꢋꢀꢉ6XPLGDꢇꢀꢂꢔ+4
&287ꢀꢏꢀꢐꢔ)ꢀꢉ7DQWDOXPꢀ7\SH4
&,1
ꢏꢀꢁꢊ)×ꢂꢀꢉ7DQWDOXPꢀ7\SH4
7
R1223N
:KHQꢀ\RXꢀXVHꢀWKHVHꢀ,&VꢇꢀFRQVLGHUꢀWKHꢀIROORZLQJꢀLVVXHVꢎ
• $VꢀVKRZQꢀLQꢀWKHꢀEORFNꢀGLDJUDPꢇꢀDꢀSDUDVLWLFꢀGLRGHꢀLVꢀIRUPHGꢀLQꢀHDFKꢀWHUPLQDOꢇꢀHDFKꢀRIꢀWKHVHꢀGLRGHVꢀLVꢀQRWꢀIRUPHGꢀIRU
ORDGꢀFXUUHQWꢇꢀWKHUHIRUHꢀGRꢀQRWꢀXVHꢀLWꢀLQꢀVXFKꢀDꢀZD\ꢆꢀ:KHQꢀ\RXꢀFRQWUROꢀWKHꢀ&(ꢀSLQꢀE\ꢀDQRWKHUꢀSRZHUꢀVXSSO\ꢇꢀGRꢀQRW
PDNHꢀLWVꢀ´+µꢀOHYHOꢀPRUHꢀWKDQꢀWKHꢀYROWDJHꢀOHYHOꢀRIꢀ9,1ꢀSLQꢆ
• 7KHꢀRSHUDWLRQꢀRIꢀODWFKꢄW\SHꢀSURWHFWLRQꢀFLUFXLWꢀLVꢀDVꢀIROORZVꢎ
:KHQꢀWKHꢀPD[LPXPꢀGXW\ꢀF\FOHꢀFRQWLQXHVꢀORQJHUꢀWKDQꢀWKHꢀGHOD\ꢀWLPHꢀIRUꢀSURWHFWLRQꢀFLUFXLWꢇꢀꢉ5HIHUꢀWRꢀWKHꢀ(OHFWULFDO
&KDUDFWHULVWLFV4ꢀWKHꢀSURWHFWLRQꢀFLUFXLWꢀZRUNVꢀWRꢀVKXWꢄGRZQꢀ3RZHUꢀ026)(7ꢀZLWKꢀLWVꢀODWFKLQJꢀRSHUDWLRQꢆꢀ7KHUHIRUH
ZKHQꢀDQꢀLQSXWꢅRXWSXWꢀYROWDJHꢀGLIIHUHQFHꢀLVꢀVPDOOꢇꢀWKHꢀSURWHFWLRQꢀFLUFXLWꢀPD\ꢀZRUNꢀZLWKꢀVPDOOꢀORDGꢀFXUUHQWꢆ
7RꢀUHOHDVHꢀWKHꢀSURWHFWLRQꢀODWFKꢀVWDWHꢇꢀDIWHUꢀGLVDEOHꢀWKLVꢀ,&ꢀZLWKꢀDꢀFKLSꢀHQDEOHꢀFLUFXLWꢇꢀHQDEOHꢀLWꢀDJDLQꢇꢀRUꢀUHVWDUWꢀWKLVꢀ,&
ZLWKꢀSRZHUꢄRQꢆꢀ+RZHYHUꢇꢀLQꢀWKHꢀFDVHꢀRIꢀUHVWDUWLQJꢀWKLVꢀ,&ꢀZLWKꢀSRZHUꢄRQꢇꢀDIWHUꢀWKHꢀSRZHUꢀVXSSO\ꢀLVꢀWXUQHGꢀRIIꢇꢀLIꢀD
FHUWDLQꢀDPRXQWꢀRIꢀFKDUJHꢀUHPDLQVꢀLQꢀ&,1ꢇꢀRUꢀVRPHꢀYROWDJHꢀLVꢀIRUFHGꢀWRꢀ9,1ꢀIURPꢀ&,1ꢇꢀWKLVꢀ,&ꢀPLJKWꢀQRWꢀEHꢀUHVWDUWHG
HYHQꢀDIWHUꢀSRZHUꢄRQꢆ
,IꢀULVLQJꢀWUDQVLWLRQꢀVSHHGꢀRIꢀVXSSO\ꢀYROWDJHꢀLVꢀWRRꢀVORZꢇꢀRUꢀWKHꢀWLPHꢀZKLFKꢀLVꢀUHTXLUHGꢀIRUꢀ9,1ꢀYROWDJHꢀWRꢀUHDFKꢀ2XWSXW
YROWDJHꢀRIꢀ'&ꢅ'&ꢀFRQYHUWHUꢀLVꢀORQJHUꢀWKDQꢀVRIWꢄVWDUWLQJꢀWLPHꢀSOXVꢀGHOD\ꢀWLPHꢀIRUꢀSURWHFWLRQꢀFLUFXLWꢇꢀSURWHFWLRQꢀFLUFXLW
ZRUNVꢀEHIRUHꢀ9,1ꢀYROWDJHꢀUHDFKHVꢀ2XWSXWꢀYROWDJHꢀRIꢀ'&ꢅ'&ꢀFRQYHUWHUꢆꢀ7RꢀSUHYHQWꢀWKLVꢀDFWLRQꢇꢀZKLOHꢀSRZHUꢀVXSSO\
YROWDJHꢀLVꢀQRWꢀUHDG\ꢇꢀPDNHꢀWKLVꢀ,&ꢀEHꢀVWDQGE\ꢀPRGHꢀꢉ&( ´/µ4ꢇꢀDQGꢀZKHQꢀWKHꢀSRZHUꢀVXSSO\ꢀLVꢀUHDG\ꢀꢉWKHꢀYROWDJHꢀOHYHO
RIꢀ9,1ꢀLVꢀHTXDOꢀRUꢀPRUHꢀWKDQꢀWKHꢀYROWDJHꢀOHYHOꢀRIꢀ92874ꢇꢀPDNHꢀLWꢀHQDEOHꢀꢉ&( ´+µ4ꢆ
• 7KHꢀRSHUDWLRQꢀRIꢀ5HVHWꢄW\SHꢀSURWHFWLRQꢀFLUFXLWꢀLVꢀDVꢀIROORZVꢎ
:KHQꢀWKHꢀPD[LPXPꢀGXW\ꢀF\FOHꢀFRQWLQXHVꢀORQJHUꢀWKDQꢀWKHꢀGHOD\ꢀWLPHꢀIRUꢀSURWHFWLRQꢀFLUFXLWꢇꢀꢉ5HIHUꢀWRꢀWKHꢀ(OHFWULFDO
&KDUDFWHULVWLFV4ꢀWKHꢀSURWHFWLRQꢀFLUFXLWꢀZRUNVꢀWRꢀUHVWDUWꢀZLWKꢀVRIWꢄVWDUWꢀRSHUDWLRQꢆꢀ7KHUHIRUHꢀZKHQꢀDQꢀLQSXWꢅRXWSXW
YROWDJHꢀGLIIHUHQFHꢀLVꢀVPDOOꢇꢀWKHꢀSURWHFWLRQꢀFLUFXLWꢀPD\ꢀZRUNꢀZLWKꢀVPDOOꢀORDGꢀFXUUHQWꢆ
• 6HWꢀH[WHUQDOꢀFRPSRQHQWVꢀDVꢀFORVHꢀDVꢀSRVVLEOHꢀWRꢀWKHꢀ,&ꢀDQGꢀPLQLPL]HꢀWKHꢀFRQQHFWLRQꢀEHWZHHQꢀWKHꢀFRPSRQHQWVꢀDQG
WKHꢀ,&ꢆꢀ,QꢀSDUWLFXODUꢇꢀDꢀFDSDFLWRUꢀVKRXOGꢀEHꢀFRQQHFWHGꢀWRꢀ9287ꢀSLQꢀZLWKꢀWKHꢀPLQLPXPꢀFRQQHFWLRQꢆꢀ$QGꢀPDNHꢀVXIILFLHQW
JURXQGLQJꢀDQGꢀUHLQIRUFHꢀVXSSO\LQJꢆꢀ$ꢀODUJHꢀVZLWFKLQJꢀFXUUHQWꢀIORZVꢀWKURXJKꢀWKHꢀFRQQHFWLRQꢀRIꢀSRZHUꢀVXSSO\ꢇꢀDQꢀLQꢄ
GXFWRUꢀDQGꢀWKHꢀFRQQHFWLRQꢀRIꢀ9287ꢆꢀ,IꢀWKHꢀLPSHGDQFHꢀRIꢀWKHꢀFRQQHFWLRQꢀRIꢀSRZHUꢀVXSSO\ꢀLVꢀKLJKꢇꢀWKHꢀYROWDJHꢀOHYHOꢀRI
SRZHUꢀVXSSO\ꢀRIꢀWKHꢀ,&ꢀIOXFWXDWHVꢀZLWKꢀWKHꢀVZLWFKLQJꢀFXUUHQWꢆꢀ7KLVꢀPD\ꢀFDXVHꢀXQVWDEOHꢀRSHUDWLRQꢀRIꢀWKHꢀ,&ꢆ
• 8VHꢀFDSDFLWRUVꢀZLWKꢀDꢀFDSDFLW\ꢀRIꢀꢂꢂ)ꢀRUꢀPRUHꢀIRUꢀ9287ꢀSLQꢇꢀDQGꢀZLWKꢀJRRGꢀKLJKꢀIUHTXHQF\ꢀFKDUDFWHULVWLFVꢀVXFKꢀDV
WDQWDOXPꢀFDSDFLWRUVꢆꢀ:HꢀUHFRPPHQGꢀ\RXꢀWRꢀXVHꢀFDSDFLWRUVꢀZLWKꢀDQꢀDOORZDEOHꢀYROWDJHꢀZKLFKꢀLVꢀDWꢀOHDVWꢀWZLFHꢀDVꢀPXFK
DVꢀVHWWLQJꢀRXWSXWꢀYROWDJHꢆꢀ7KLVꢀLVꢀEHFDXVHꢀWKHUHꢀPD\ꢀEHꢀDꢀFDVHꢀZKHUHꢀDꢀVSLNHꢄVKDSHGꢀKLJKꢀYROWDJHꢀLVꢀJHQHUDWHGꢀE\ꢀDQ
LQGXFWRUꢀZKHQꢀDQꢀH[WHUQDOꢀWUDQVLVWRUꢀLVꢀRQꢀDQGꢀRIIꢆ
• &KRRVHꢀDQꢀLQGXFWRUꢀWKDWꢀKDVꢀVXIILFLHQWO\ꢀVPDOOꢀ'&ꢀUHVLVWDQFHꢀDQGꢀODUJHꢀDOORZDEOHꢀFXUUHQWꢀDQGꢀLVꢀKDUGꢀWRꢀUHDFKꢀPDJꢄ
QHWLFꢀVDWXUDWLRQꢆꢀ$QGꢀLIꢀWKHꢀYDOXHꢀRIꢀLQGXFWDQFHꢀRIꢀDQꢀLQGXFWRUꢀLVꢀH[WUHPHO\ꢀVPDOOꢇꢀWKHꢀ,/;ꢀPD\ꢀH[FHHGꢀWKHꢀDEVROXWH
PD[LPXPꢀUDWLQJꢀDWꢀWKHꢀPD[LPXPꢀORDGLQJꢆ
8VHꢀDQꢀLQGXFWRUꢀZLWKꢀDSSURSULDWHꢀLQGXFWDQFHꢆ
• 8VHꢀDꢀGLRGHꢀRIꢀDꢀ6FKRWWN\ꢀW\SHꢀZLWKꢀKLJKꢀVZLWFKLQJꢀVSHHGꢇꢀDQGꢀDOVRꢀSD\ꢀDWWHQWLRQꢀWRꢀLWVꢀFXUUHQWꢀFDSDFLW\ꢆ
• 'RꢀQRWꢀXVHꢀWKLVꢀ,&ꢀXQGHUꢀWKHꢀFRQGLWLRQꢀDWꢀ9,1ꢀYROWDJHꢀOHVVꢀWKDQꢀPLQLPXPꢀRSHUDWLQJꢀYROWDJHꢆ
✩
7KHꢀSHUIRUPDQFHꢀRIꢀSRZHUꢀVRXUFHꢀFLUFXLWVꢀXVLQJꢀWKHVHꢀ,&VꢀH[WUHPHO\ꢀGHSHQGVꢀXSRQꢀWKHꢀSHULSKHUDOꢀFLUFXLWVꢆ
3D\ꢀDWWHQWLRQꢀLQꢀWKHꢀVHOHFWLRQꢀRIꢀWKHꢀSHULSKHUDOꢀFLUFXLWVꢆꢀ,QꢀSDUWLFXODUꢇꢀGHVLJQꢀWKHꢀSHULSKHUDOꢀFLUFXLWVꢀLQꢀDꢀZD\ꢀWKDW
8
R1223N
WKHꢀYDOXHVꢀVXFKꢀDVꢀYROWDJHꢇꢀFXUUHQWꢇꢀDQGꢀSRZHUꢀRIꢀHDFKꢀFRPSRQHQWꢇꢀ3&%ꢀSDWWHUQVꢀDQGꢀWKHꢀ,&ꢀGRꢀQRWꢀH[FHHGꢀWKHLU
UHVSHFWHGꢀUDWHGꢀYDOXHVꢆ
OPERATION of step-down DC/DC converter and Output Current
7KHꢀVWHSꢄGRZQꢀ'&ꢅ'&ꢀFRQYHUWHUꢀFKDUJHVꢀHQHUJ\ꢀLQꢀWKHꢀLQGXFWRUꢀZKHQꢀ/[ꢀWUDQVLVWRUꢀLVꢀ21ꢇꢀDQGꢀGLVFKDUJHVꢀWKHꢀHQꢄ
HUJ\ꢀIURPꢀWKHꢀLQGXFWRUꢀZKHQꢀ/[ꢀWUDQVLVWRUꢀLVꢀ2))ꢀDQGꢀFRQWUROVꢀZLWKꢀOHVVꢀHQHUJ\ꢀORVVꢇꢀVRꢀWKDWꢀDꢀORZHUꢀRXWSXWꢀYROWDJH
WKDQꢀWKHꢀLQSXWꢀYROWDJHꢀLVꢀREWDLQHGꢆꢀ7KHꢀRSHUDWLRQꢀZLOOꢀEHꢀH[SODLQHGꢀZLWKꢀUHIHUHQFHꢀWRꢀWKHꢀIROORZLQJꢀGLDJUDPVꢀꢏ
<Current through L>
<Basic Circuits>
i1
IL
I
OUT
ILmax
L
i2
Lx Tr
ILmin
V
OUT
VIN
topen
SD
CL
ton
toff
T=1/fosc
6WHSꢀꢁꢀꢏ/[7UꢀWXUQVꢀRQꢀDQGꢀFXUUHQWꢀ,/ꢀꢉ Lꢁ4ꢀIORZVꢇꢀDQGꢀHQHUJ\ꢀLVꢀFKDUJHGꢀLQWRꢀ&/ꢆꢀ$WꢀWKLVꢀPRPHQWꢇꢀ,/ꢀLQFUHDVHVꢀIURP
,/PLQꢀꢉ ꢊ4ꢀWRꢀUHDFKꢀ,/PD[ꢀLQꢀSURSRUWLRQꢀWRꢀWKHꢀRQꢄWLPHꢀSHULRGꢀꢉWRQ4ꢀRIꢀ/;7Uꢆ
6WHSꢀꢂꢀꢏ:KHQꢀ/[7UꢀWXUQVꢀRIIꢇꢀ6FKRWWN\ꢀGLRGHꢀꢉ6'4ꢀWXUQVꢀRQꢀLQꢀRUGHUꢀWKDWꢀ/ꢀPDLQWDLQVꢀ,/ꢀDWꢀ,/PD[ꢇꢀDQGꢀFXUUHQWꢀ,/ꢀꢉ Lꢂ4
IORZVꢆ
6WHSꢀꢃꢀꢏ,/ꢀGHFUHDVHVꢀJUDGXDOO\ꢀDQGꢀUHDFKHVꢀ,/PLQꢀDIWHUꢀDꢀWLPHꢀSHULRGꢀRIꢀWRSHQꢇꢀDQGꢀ6'ꢀWXUQVꢀRIIꢇꢀSURYLGHGꢀWKDWꢀLQꢀWKH
FRQWLQXRXVꢀPRGHꢇꢀQH[WꢀF\FOHꢀVWDUWVꢀEHIRUHꢀ,/ꢀEHFRPHVꢀWRꢀꢊꢀEHFDXVHꢀWRIIꢀWLPHꢀLVꢀQRWꢀHQRXJKꢆꢀ,QꢀWKLVꢀFDVHꢇꢀ,/
YDOXHꢀLQFUHDVHVꢀIURPꢀWKLVꢀ,/PLQꢀꢉ!ꢊ4ꢆ
,QꢀWKHꢀFDVHꢀRIꢀ3:0ꢀFRQWUROꢀV\VWHPꢇꢀWKHꢀRXWSXWꢀYROWDJHꢀLVꢀPDLQWDLQHGꢀE\ꢀFRQWUROOLQJꢀWKHꢀRQꢄWLPHꢀSHULRGꢀꢉWRQ4ꢇꢀZLWK
WKHꢀRVFLOODWRUꢀIUHTXHQF\ꢀꢉIRVF4ꢀEHLQJꢀPDLQWDLQHGꢀFRQVWDQWꢆ
• Discontinuous Conduction Mode and Continuous Conduction Mode
7KHꢀPD[LPXPꢀYDOXHꢀꢉ,/PD[4ꢀDQGꢀWKHꢀPLQLPXPꢀYDOXHꢀꢉ,/PLQ4ꢀRIꢀWKHꢀFXUUHQWꢀZKLFKꢀIORZVꢀWKURXJKꢀWKHꢀLQGXFWRUꢀDUH
WKHꢀVDPHꢀDVꢀWKRVHꢀZKHQꢀ/[7UꢀLVꢀ21ꢀDQGꢀZKHQꢀLWꢀLVꢀRIIꢆ
7KHꢀGLIIHUHQFHꢀEHWZHHQꢀ,/PD[ꢀDQGꢀ,/PLQꢇꢀZKLFKꢀLVꢀUHSUHVHQWHGꢀE\ꢀ∆,ꢀꢎ
∆, ,/PD[ꢄ,/PLQ 9287×WRSHQꢅ/ ꢉ9,1ꢄ92874×WRQꢅ/ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢁ
ZKHUHLQꢀ7 ꢁꢅIRVF WRQꢑWRII
GXW\ꢀꢉꢍ4 WRQꢅ7×ꢁꢊꢊ WRQ×IRVF×ꢁꢊꢊ
WRSHQꢀ≤ꢀWRII
9
R1223N
,Qꢀ(TXDWLRQꢀꢁꢇꢀ9287×WRSHQꢅ/ꢀDQGꢀꢉ9,1ꢄ92874×WRQꢅ/ꢀUHVSHFWLYHO\ꢀVKRZꢀWKHꢀFKDQJHꢀRIꢀWKHꢀFXUUHQWꢀDWꢀRQꢀVWDWHꢇꢀDQGꢀWKH
FKDQJHꢀRIꢀWKHꢀFXUUHQWꢀDWꢀRIIꢀVWDWHꢆ
:KHQꢀWKHꢀRXWSXWꢀFXUUHQWꢀꢉ,2874ꢀLVꢀUHODWLYHO\ꢀVPDOOꢇꢀWRSHQꢕWRIIꢀDVꢀLOOXVWUDWHGꢀLQꢀWKHꢀDERYHꢀGLDJUDPꢆꢀ,QꢀWKLVꢀFDVHꢇꢀWKH
HQHUJ\ꢀLVꢀFKDUJHGꢀLQꢀWKHꢀLQGXFWRUꢀGXULQJꢀWKHꢀWLPHꢀSHULRGꢀRIꢀWRQꢀDQGꢀLVꢀGLVFKDUJHGꢀLQꢀLWVꢀHQWLUHO\ꢀGXULQJꢀWKHꢀWLPHꢀSHULRG
RIꢀWRIIꢇꢀWKHUHIRUHꢀ,/PLQꢀEHFRPHVꢀWRꢀ]HURꢀꢉ,/PLQ ꢊ4ꢆꢀ:KHQꢀ,287ꢀLVꢀJUDGXDOO\ꢀLQFUHDVHGꢇꢀHYHQWXDOO\ꢇꢀWRSHQꢀEHFRPHVꢀWR
WRIIꢀꢉWRSHQ WRII4ꢇꢀDQGꢀZKHQꢀ,287ꢀLVꢀIXUWKHUꢀLQFUHDVHGꢇꢀ,/PLQꢀEHFRPHVꢀODUJHUꢀWKDQꢀ]HURꢀꢉ,/PLQ!ꢊ4ꢆꢀ7KHꢀIRUPHUꢀPRGHꢀLV
UHIHUUHGꢀWRꢀDVꢀWKHꢀGLVFRQWLQXRXVꢀPRGHꢀDQGꢀWKHꢀODWWHUꢀPRGHꢀLVꢀUHIHUUHGꢀWRꢀDVꢀFRQWLQXRXVꢀPRGHꢆ
,QꢀWKHꢀFRQWLQXRXVꢀPRGHꢇꢀZKHQꢀ(TXDWLRQꢀꢁꢀLVꢀVROYHGꢀIRUꢀWRQꢀDQGꢀDVVXPHGꢀWKDWꢀWKHꢀVROXWLRQꢀLVꢀWRQFꢇ
WRQF 7×9287ꢅ9,1 ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢂ
:KHQꢀWRQꢕWRQFꢇꢀWKHꢀPRGHꢀLVꢀWKHꢀGLVFRQWLQXRXVꢀPRGHꢇꢀDQGꢀZKHQꢀWRQ WRQFꢇꢀWKHꢀPRGHꢀLVꢀWKHꢀFRQWLQXRXVꢀPRGHꢆ
Output Current and Selection of External Components
:KHQꢀ/[7UꢀLVꢀ21ꢏ
ꢉ:KHUHLQꢇꢀ5LSSOHꢀ&XUUHQWꢀ3ꢄ3ꢀYDOXHꢀLVꢀGHVFULEHGꢀDVꢀ,53ꢇꢀ21ꢀUHVLVWDQFHꢀRIꢀ/;7UꢀLVꢀGHVFULEHGꢀDVꢀ53ꢀWKHꢀGLUHFWꢀFXUUHQW
UHVLVWDQFHꢀRIꢀWKHꢀLQGXFWRUꢀLVꢀGHVFULEHGꢀDVꢀ5/ꢆ4
9,1 9287ꢑꢉ53ꢑ5/4×,287ꢑ/×,53ꢅWRQ ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢃ
:KHQꢀ/[7UꢀLVꢀ2))ꢏ
/×,53ꢅWRII 9)ꢑ9287ꢑ5/×,287 ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢐ
3XWꢀ(TXDWLRQꢀꢐꢀWRꢀ(TXDWLRQꢀꢃꢀDQGꢀVROYHꢀIRUꢀ21ꢀGXW\ꢇꢀWRQꢅꢉWRIIꢑWRQ4 '21ꢇ
'21 ꢉ9287ꢑ9)ꢑ5/×,2874ꢅꢉ9,1ꢑ9)ꢄ53×,2874ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢋ
5LSSOHꢀ&XUUHQWꢀLVꢀDVꢀIROORZVꢎ
,53 ꢉ9,1ꢄ9287ꢄ53×,287ꢄ5/×,2874×'21ꢅIꢅ/ꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢓ
ZKHUHLQꢇꢀSHDNꢀFXUUHQWꢀWKDWꢀIORZVꢀWKURXJKꢀ/ꢇꢀ/[7UꢇꢀDQGꢀ6'ꢀLVꢀDVꢀIROORZVꢎ
,/PD[ ,287ꢑ,53ꢅꢂꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆꢆ (TXDWLRQꢀꢔ
&RQVLGHUꢀ,/PD[ꢇꢀFRQGLWLRQꢀRIꢀLQSXWꢀDQGꢀRXWSXWꢀDQGꢀVHOHFWꢀH[WHUQDOꢀFRPSRQHQWVꢆ
10
R1223N
ꢀ 7KHꢀDERYHꢀH[SODQDWLRQꢀLVꢀGLUHFWHGꢀWRꢀWKHꢀFDOFXODWLRQꢀLQꢀDQꢀLGHDOꢀFDVHꢀLQꢀFRQWLQXRXVꢀPRGHꢆ
External Components
1. Inductor
6HOHFWꢀDQꢀLQGXFWRUꢀWKDWꢀSHDNꢀFXUUHQWꢀGRHVꢀQRWꢀH[FHHGꢀ,/PD[ꢆꢀ,IꢀODUJHUꢀFXUUHQWꢀWKDQꢀDOORZDEOHꢀFXUUHQWꢀIORZVꢇꢀPDJꢄ
QHWLFꢀVDWXUDWLRQꢀRFFXUVꢀDQGꢀPDNHꢀWUDQVIRUPꢀHIILFLHQF\ꢀZRUVHꢆ
:KHQꢀWKHꢀORDGꢀFXUUHQWꢀLVꢀVDPHꢇꢀWKHꢀVPDOOHUꢀYDOXHꢀRIꢀ/ꢀLVꢀXVHGꢇꢀWKHꢀODUJHUꢀWKHꢀULSSOHꢀFXUUHQWꢀLVꢆ
3URYLGHGꢀWKDWꢀWKHꢀDOORZDEOHꢀFXUUHQWꢀLVꢀODUJHꢀLQꢀWKDWꢀFDVHꢀDQGꢀ'&ꢀFXUUHQWꢀLVꢀVPDOOꢇꢀWKHUHIRUHꢇꢀIRUꢀODUJHꢀRXWSXWꢀFXUUHQWꢇ
HIILFLHQF\ꢀLVꢀEHWWHUꢀWKDQꢀXVLQJꢀDQꢀLQGXFWRUꢀZLWKꢀDꢀODUJHꢀYDOXHꢀRIꢀ/ꢀDQGꢀYLFHꢀYHUVDꢆ
2. Diode
8VHꢀDꢀGLRGHꢀZLWKꢀORZꢀ9)ꢀꢉ6FKRWWN\ꢀW\SHꢀLVꢀUHFRPPHQGHGꢆ4ꢀDQGꢀKLJKꢀVZLWFKLQJꢀVSHHGꢆ
5HYHUVHꢀYROWDJHꢀUDWLQJꢀVKRXOGꢀEHꢀPRUHꢀWKDQꢀ9,1ꢀDQGꢀFXUUHQWꢀUDWLQJꢀVKRXOGꢀEHꢀHTXDOꢀRUꢀPRUHꢀWKDQꢀ,/PD[ꢆ
3. Capacitor
$VꢀIRUꢀ&,1ꢇꢀXVHꢀDꢀFDSDFLWRUꢀZLWKꢀORZꢀ(65ꢀꢉ(TXLYDOHQWꢀ6HULHVꢀ5HVLVWDQFH4ꢀDQGꢀDꢀFDSDFLW\ꢀRIꢀDWꢀOHDVWꢀꢁꢊ)ꢀIRUꢀVWDEOH
RSHUDWLRQꢆ
&287ꢀFDQꢀUHGXFHꢀULSSOHꢀRIꢀ2XWSXWꢀ9ROWDJHꢇꢀWKHUHIRUHꢀꢐꢔꢀWRꢀꢁꢊꢊ)ꢀWDQWDOXPꢀW\SHꢀLVꢀUHFRPPHQGHGꢆ
4. Lx Transistor
3FKꢀ3RZHUꢀ026ꢀ)(7ꢀLVꢀUHTXLUHGꢀIRUꢀWKLVꢀ,&ꢆ
,WVꢀEUHDNGRZQꢀYROWDJHꢀEHWZHHQꢀJDWHꢀDQGꢀVRXUFHꢀVKRXOGꢀEHꢀDꢀIHZꢀYROWꢀKLJKHUꢀWKDQꢀ,QSXWꢀ9ROWDJHꢆ
,QꢀWKHꢀFDVHꢀRIꢀ,QSXWꢀ9ROWDJHꢀLVꢀORZꢇꢀWRꢀWXUQꢀRQꢀ026ꢀ)(7ꢀFRPSOHWHO\ꢇꢀVHOHFWꢀDꢀ026ꢀ)(7ꢀZLWKꢀORZꢀWKUHVKROGꢀYROWDJHꢆ
,IꢀDꢀODUJHꢀORDGꢀFXUUHQWꢀLVꢀQHFHVVDU\ꢀIRUꢀ\RXUꢀDSSOLFDWLRQꢀDQGꢀLPSRUWDQWꢇꢀFKRRVHꢀDꢀ026ꢀ)(7ꢀZLWKꢀORZꢀ21ꢀUHVLVWDQFH
IRUꢀJRRGꢀHIILFLHQF\ꢆ
,IꢀDꢀVPDOOꢀORDGꢀFXUUHQWꢀLVꢀPDLQO\ꢀQHFHVVDU\ꢀIRUꢀ\RXUꢀDSSOLFDWLRQꢇꢀFKRRVHꢀDꢀ026ꢀ)(7ꢀZLWKꢀORZꢀJDWHꢀFDSDFLW\ꢀIRUꢀJRRG
HIILFLHQF\ꢆ
0D[LPXPꢀFRQWLQXRXVꢀGUDLQꢀFXUUHQWꢀRIꢀ026ꢀ)(7ꢀVKRXOGꢀEHꢀODUJHUꢀWKDQꢀSHDNꢀFXUUHQWꢇꢀ,/PD[ꢆ
11
R1223N
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
L=27µH
R1223N152H
L=27µH
R1223N332H
1.530
1.520
1.510
1.500
1.490
1.480
1.470
3.400
3.380
3.360
3.340
3.320
3.300
3.280
12V
8V
4.5V
13.2V
8V
3.260
3.240
5V
3.220
3.200
2.3V
1E-05 0.0001 0.001
0.01
0.1
1
1E-05 0.0001 0.001
0.01
0.1
1
Output Current IOUT(A)
Output Current IOUT(A)
2) Efficiency vs. Output Current
R1223N332A(VIN=4.5V)
CD104-27µH
Si3443DV
CD104-27µH
Si3443DV
R1223N332A(VIN=12V)
100
90
80
70
60
50
100
90
80
70
60
50
40
30
20
40
30
20
10
0
0.1
10
0
0.1
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
CD104-27µH
Si3443DV
CD104-27µH
R1223N332B(VIN=4.5V)
R1223N332B(VIN=12V)
Si3443DV
100
100
90
80
70
60
50
90
80
70
60
50
40
30
20
40
30
20
10
0
0.1
10
0
0.1
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
12
R1223N
CD104-27µH
Si3443DV
CD104-27µH
Si3443DV
R1223N332C(VIN=12V)
R1223N332C(VIN=4.5V)
100
90
80
70
60
50
100
90
80
70
60
50
40
30
20
40
30
20
10
0
0.1
10
0
0.1
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
CD104-27µH
Si3443DV
CD104-27µH
Si3443DV
R1223N502A(VIN=12V)
R1223N502A(VIN=6.0V)
100
90
80
70
60
50
100
90
80
70
60
50
40
30
20
40
30
20
10
0
0.1
10
0
0.1
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
CD104-27µH
Si3443DV
CD104-27µH
Si3443DV
R1223N502B(VIN=12V)
R1223N502B(VIN=6.0V)
100
90
80
70
60
50
100
90
80
70
60
50
40
30
20
40
30
20
10
0
0.1
10
0
0.1
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
13
R1223N
CD104-27µH
Si3443DV
CD104-27µH
Si3443DV
R1223N502C(VIN=6.0V)
R1223N502C(VIN=12V)
100
90
80
70
60
50
100
90
80
70
60
50
40
30
20
40
30
20
10
0
0.1
10
0
0.1
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
3) Ripple Voltage vs. Output Current
L=27µH
R1223N332A
L=27µH
R1223N502A
200
200
180
180
160
140
120
100
V
V
V
IN4.5V
IN8V
V
V
V
IN6V
160
140
120
100
IN8V
IN12V
IN12V
80
60
80
60
40
20
0
40
20
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
L=27µH
L=27µH
R1223N332B
R1223N332H
200
180
160
140
120
100
200
180
160
140
120
100
V
V
V
IN6V
V
V
V
IN4.5V
IN8V
IN8V
IN12V
IN12V
80
60
80
60
40
20
0
40
20
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
14
R1223N
L=27µH
L=27µH
R1223N332C
R1223N502C
200
180
160
140
120
100
200
180
160
140
120
100
V
V
V
IN4.5V
V
V
V
IN6V
IN8V
IN8V
IN12V
IN12V
80
60
80
60
40
20
0
40
20
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
4) Oscillator Frequency vs. Input Voltage
L=27µH
L=27µH
R1223N152B
R1223N152A
600
500
400
300
200
100
0
600
500
400
300
200
100
0
0
5
10
15
0
5
10
15
Intput Voltage VIN(V)
Intput Voltage VIN(V)
5) Output Voltage vs. Input Voltage
L=27µH
L=27µH
R1223N152B
R1223N152A
1.53
1.53
1.52
1.52
1.51
1.50
1.49
1.51
1.50
1.49
1.48
1.47
1.48
1.47
0
5
10
15
0
5
10
15
Intput Voltage VIN(V)
Intput Voltage VIN(V)
15
R1223N
L=27µH
L=27µH
R1223N332A
R1223N332B
3.36
3.34
3.36
3.34
3.32
3.30
3.28
3.32
3.30
3.28
3.26
3.24
3.26
3.24
0
5
10
15
0
5
10
15
Intput Voltage VIN(V)
Intput Voltage VIN(V)
6) Output Voltage vs. Temperature
R1223N332H
L=27µH
IN=2.7V
L=27µH
IN=4.5V
R1223N152B
V
V
1.51
1.50
1.49
1.48
1.47
3.33
3.32
3.31
3.30
3.29
3.28
3.27
-50
0
50
100
-50
0
50
100
Temperature Topt (°C)
Temperature Topt (°C)
7) Oscillator Frequency vs. Temperature
L=27µH
R1223N252A
V
IN=3.7V
L=27µH
IN=4.5V
R1223N332B
V
360
340
320
300
600
550
500
450
400
280
260
240
-50
50
Temperature Topt (°C)
100
-50
50
Temperature Topt (°C)
100
0
0
16
R1223N
8) Supply Current vs. Temperature
R1223N332H
R1223N332G
140
130
100
90
80
70
60
50
120
110
100
90
V
V
V
IN15V
IN13.2V
IN8V
V
V
V
IN15V
IN13.2V
IN8V
80
70
60
-50
50
Temperature Topt (°C)
100
-50
50
100
0
0
Temperature Topt (°C)
9) Soft-start time vs. Temperature
L=27µH
R1223N332B
L=27µH
V
IN=4.5V
R1223N252A
V
IN=3.7V
10
8
16
14
12
10
6
4
2
0
8
6
4
2
0
-50
50
Temperature Topt (°C)
100
0
-50
50
100
0
Temperature Topt (°C)
10) Delay Time for Latch-type protection vs. Temperature
R1223N332B
V
IN=4.5V
R1223N252A
VIN=3.7V
4.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50
50
100
0
-50
50
Temperature Topt (°C)
100
0
Temperature Topt (°C)
17
R1223N
11) Delay Time for Reset-type Protection vs. Temperature
R1223N332G
R1223N332H
V
IN=4.5V
VIN=4.5V
5
5
4
3
2
1
0
4
3
2
1
0
-50
50
100
-50
50
100
0
0
Temperature Topt (°C)
Temperature Topt (°C)
12) EXT “H” Output Current vs. Temperature
R1223N332B
16
14
12
10
8
6
4
2
0
-50
50
Temperature Topt (°C)
100
0
13) EXT “L” Output Current vs. Temperature
R1223N332B
30
25
20
15
10
5
0
-50
50
Temperature Topt (°C)
100
0
18
R1223N
14) Load Transient Response
R1223N332A
V
IN=5V
V
IN=5V
R1223N332A
L=27µH
L=27µH
3.6
3.4
3.5
3.4
3.3
3.2
3.3
3.1
3
500
0.1
500
0.1
0
0.05
0.1
0
0.0002
0.0002
0.0002
0.0004 0.0006 0.0008 0.001
Time (sec)
Time (sec)
V
IN=5V
V
IN=5V
R1223N332B
R1223N332B
L=27µH
L=27µH
3.6
3.4
3.5
3.4
3.3
3.2
3.3
3.1
3
500
0.1
500
0.1
0
0.05
0.1
0
0.0004 0.0006 0.0008 0.001
Time (sec)
Time (sec)
V
IN=5V
V
IN=5V
R1223N332C
R1223N332C
L=27µH
L=27µH
3.6
3.4
3.5
3.4
3.3
3.2
3.3
3.2
3.1
3
2.9
2.8
500
0.1
500
0.1
0
0.05
0.1
0
0.0004 0.0006 0.0008 0.001
Time (sec)
Time (sec)
19
R1223N
V
IN=5V
V
IN=5V
R1223N332D
L=27µH
R1223N332C
L=27µH
3.4
3.6
3.3
3.2
3.5
3.4
3.1
3
3.3
3.2
500
0.1
2.9
500
0.1
0
0.0002
0.0004 0.0006 0.0008 0.001
0
0.05
0.1
Time (sec)
Time (sec)
15) Turn-on Waveform
R1223N332A(VIN=10V,IOUT=0mA)
R1223N332A(VIN=5V,IOUT=0mA)
L=27µH
L=27µH
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
5
10
0
0
-0.01
0
0.01
0.02
-0.01
0
0.01
0.02
Time (sec)
Time (sec)
R1223N332B(VIN=5V, IOUT=0mA)
R1223N332B(VIN=10V, IOUT=0mA)
L=27µH
L=27µH
3.5
3.5
3
2.5
2
3
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
5
0
10
0
-0.01
0
0.01
0.02
-0.01
0
0.01
0.02
Time (sec)
Time (sec)
20
R1223N
R1223N332A(VIN=5V, IOUT=100mA)
R1223N332A(VIN=10V, IOUT=100mA)
L=27µH
L=27µH
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
10
0
5
0
-0.01
0
0.01
0.02
-0.01
0
0.01
0.02
Time (sec)
Time (sec)
R1223N332B(VIN=10V, IOUT=100mA)
R1223N332B(VIN=5V, IOUT=100mA)
L=27µH
L=27µH
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
10
0
5
0
-0.01
0
0.01
0.02
-0.01
0
0.01
0.02
Time (sec)
Time (sec)
21
相关型号：
R1223N502H-TL
Switching Controller, Voltage-mode, 0.01A, 600kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN
RICOH
©2020 ICPDF网 联系我们和版权申明