R5210D26C-TR-FA [RICOH]
Switching Regulator, 0.8A, CMOS, PDSO6, HSON-6;
| 型号： | R5210D26C-TR-FA |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator, 0.8A, CMOS, PDSO6, HSON-6 光电二极管 |
| 文件： | 总13页 (文件大小：142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Step-down DC/DC Converter
with VR and Reset
NO. EA-102-0301
5ꢀꢁꢂꢃ[ꢄ6(5,(6
OUTLINE
7KHꢈ5ꢀꢁꢂꢃ[ꢈLVꢈ&026ꢉEDVHGꢈ3:0ꢈVWHSꢉGRZQꢈ'&ꢅ'&ꢈFRQYHUWHUꢈFRPELQHGꢈZLWKꢈDꢈYROWDJHꢈUHJXODWRUꢈ*95,ꢈDQGꢈDꢈYROWꢉ
DJHꢈGHWHFWRUꢈ*9',-ꢈZLWKꢈORZꢈVXSSO\ꢈFXUUHQWꢄ
(DFKꢈRIꢈWKHVHꢈꢊ&VꢈFRQVLVWVꢈRIꢈDQꢈRVFLOODWRU-ꢈDꢈ3:0ꢈFRQWUROꢈFLUFXLW-ꢈDꢈUHIHUHQFHꢈYROWDJHꢈXQLW-ꢈDQꢈHUURUꢈDPSOLILHU-ꢈDꢈVRIWꢉ
VWDUWꢈFLUFXLW-ꢈDꢈFXUUHQWꢈOLPLWꢈFLUFXLW-ꢈDꢈSKDVHꢈFRPSHQVDWLRQꢈFLUFXLW-ꢈDꢈUHVLVWRUꢈQHWꢈIRUꢈYROWDJHꢈGHWHFWꢈFLUFXLW-ꢈDQꢈRXWSXW
GULYHUꢈWUDQVLVWRU-ꢈDQGꢈVRꢈRQꢄꢈ$ꢈORZꢈULSSOH-ꢈKLJKꢈHIILFLHQF\ꢈVWHSꢉGRZQꢈ'&ꢅ'&ꢈFRQYHUWHUꢈFDQꢈEHꢈHDVLO\ꢈFRPSRVHGꢈRIꢈWKLV
ꢊ&ꢈZLWKꢈVRPHꢈH[WHUQDOꢈFRPSRQHQWV-ꢈRUꢈDQꢈLQGXFWRU-ꢈDꢈGLRGH-ꢈDQGꢈFDSDFLWRUVꢄ
7KHꢈRVFLOODWRUꢈIUHTXHQF\ꢈLVꢈꢋꢃꢃN+]-ꢈWKHUHIRUHꢈVPDOOꢈLQGXFWRUꢈDQGꢈFDSDFLWRUꢈFDQꢈEHꢈXVHGꢈZLWKꢈWKLVꢈꢊ&ꢄꢈ)XUWKHU-ꢈWKLVꢈꢊ&
HTXLSVꢈWKHꢈXQGHUꢈYROWDJHꢈORFNRXWꢈIXQFWLRQꢈ*89/2,ꢄꢈꢊIꢈWKHꢈLQSXWꢈYROWDJHꢈEHFRPHVꢈꢁꢄꢆꢀ9ꢈ*7\Sꢄ,ꢈRUꢈOHVV-ꢈWKHꢈRXWSXWꢈRI
'&ꢅ'&ꢈFRQYHUWHUꢈLVꢈWXUQHGꢈRIIꢄꢈ+RZHYHU-ꢈHPEHGGHGꢈYROWDJHꢈUHJXODWRUꢈDQGꢈWKHꢈGHWHFWRUꢈFRQWLQXHꢈWRꢈRSHUDWHꢄ
7KHꢈYROWDJHꢈUHJXODWRUꢈFRQVLVWVꢈRIꢈDꢈUHIHUHQFHꢈYROWDJHꢈXQLW-ꢈDꢈUHVLVWRUꢈQHWꢈIRUꢈYROWDJHꢈGHWHFWꢈFLUFXLW-ꢈDQꢈHUURUꢈDPSOLꢉ
ILHU-ꢈDQꢈRXWSXWꢈGULYHUꢈWUDQVLVWRU-ꢈDQGꢈVRꢈRQꢄ
7KHꢈEXLOWꢉLQꢈYROWDJHꢈGHWHFWRUꢈVXSHUYLVHVꢈWKHꢈLQSXWꢈYROWDJHꢈDQGꢈWKHꢈRXWSXWꢈLVꢈ1ꢉFKDQQHOꢈRSHQꢈGUDLQꢈW\SHꢄꢈ3RZHUꢉRQ
UHVHWꢈGHOD\ꢈWLPHꢈLVꢈDOVRꢈLQFOXGHGꢈDQGꢈLQWHUQDOO\ꢈVHWꢈW\SLFDOO\ꢈDWꢈꢂꢃPVꢄ
FEATURES
• :LGHꢈ5DQJHꢈRIꢈꢊQSXWꢈ9ROWDJHꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢁꢄꢌ9aꢀꢄꢀ9
• %XLOWꢉLQꢈ6RIWꢉVWDUWꢈ)XQFWLRQꢈ*7\SꢄꢈꢁPV,ꢈDQGꢈEXLOWꢉLQꢈSRZHUꢉRQꢈUHVHWꢈGHOD\ꢈ*7\SꢄꢈꢂꢃPV,
• 0D[LPXPꢈ2XWSXWꢈ&XUUHQWꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢀꢃꢃP$ꢈ*'&ꢅ'&,-ꢈꢁꢃꢃP$ꢈ*95,
• +LJKꢈ$FFXUDF\ꢈ2XWSXWꢈ9ROWDJH ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢁꢄꢃ?ꢈ*'&ꢅ'&ꢈDQGꢈ9ROWDJHꢈ5HJXODWRUꢈ2XWSXW,
• $FFXUDF\ꢈRIꢈYROWDJHꢈGHWHFWRUꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢁꢄꢀ?
• 2XWSXWꢈ9ROWDJHꢈ*95,ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ6WHSZLVHꢈ6HWWLQJꢈZLWKꢈDꢈVWHSꢈRIꢈꢃꢄꢂ9ꢈLQꢈWKHꢈUDQJHꢈRIꢈꢁꢄꢀ9ꢈWRꢈꢆꢄꢍ9
• 2XWSXWꢈ9ROWDJHꢈ*'&ꢅ'&, ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ6WHSZLVHꢈ6HWWLQJꢈZLWKꢈDꢈVWHSꢈRIꢈꢃꢄꢂ9ꢈLQꢈWKHꢈUDQJHꢈRIꢈꢂꢄꢀ9ꢈWRꢈꢆꢄꢆ9
• 2XWSXWꢈ9ROWDJHꢈ*9',ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ6WHSZLVHꢈ6HWWLQJꢈZLWKꢈDꢈVWHSꢈRIꢈꢃꢄꢂ9ꢈLQꢈWKHꢈUDQJHꢈRIꢈꢆꢄꢃ9ꢈWRꢈꢇꢄꢀ9
• 3DFNDJHVꢈ ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢈ627ꢉꢁꢆꢉꢍ:ꢈ*WKLFNQHVVꢎꢈ0D[ꢄꢈꢂꢄꢆPP,ꢈRUꢈ+621ꢉꢍꢈ*WKLFNQHVVꢎꢈ0D[ꢄꢈꢃꢄꢏPP,
APPLICATIONS
• 3RZHUꢈVRXUFHꢈIRUꢈKDQGꢉKHOGꢈFRPPXQLFDWLRQꢈHTXLSPHQW-ꢈ&'ꢈRUꢈ'9'ꢈGULYHVꢄ
• 3RZHUꢈVRXUFHꢈIRUꢈEDWWHU\ꢉSRZHUHGꢈHTXLSPHQWꢄ
1
R5210x
BLOCK DIAGRAM
Current Limit
CONTROL
V
IN
OSC
VOUT1
+
-
-
-
LX
OUTPUT
CONTROL
+
Vref
Soft Start
Current Limit
-
Vref
U.V.L.O.
Delay Circuit
+
V
OUT2
+
-
Vref
VDOUT
GND
SELECTION GUIDE
ꢊQꢈWKHꢈ5ꢀꢁꢂꢃ[ꢈ6HULHV-ꢈWKHꢈRXWSXWꢈYROWDJHꢈFRPELQDWLRQꢈIRUꢈWKHꢈꢊ&VꢈFDQꢈEHꢈVHOHFWHGꢈDWꢈWKHꢈXVHU·VꢈUHTXHVWꢄ
7KHꢈVHOHFWLRQꢈFDQꢈEHꢈPDGHꢈZLWKꢈGHVLJQDWLQJꢈWKHꢈSDUWꢈQXPEHUꢈDVꢈVKRZQꢈEHORZꢐ
5ꢀꢁꢂꢃ[[[[[ꢉ75
↑ ↑ ↑ ↑
D E F G
←3DUWꢈ1XPEHU
Code
Contents
'HVLJQDWLQJꢈWKHꢈ3DFNDJHꢈW\SHꢎ
1ꢎꢈ627ꢉꢁꢆꢉꢍ:
D
'ꢎꢈ+621ꢉꢍꢈ*8QGHUꢈ'HYHORSPHQW,
E
F
G
2XWSXWꢈ9ROWDJHꢈ&RPELQDWLRQꢈ&RGHꢈ1XPEHU
'HVLJQDWLRQꢈRIꢈ2SWLRQDOꢈ)XQFWLRQ
&ꢈ*6WDQGDUG,
'HVLJQDWLRQꢈRIꢈ7DSLQJꢈ7\SHꢎꢈ5HIHUꢈWRꢈ7DSLQJꢈVSHFLILFDWLRQꢄ
2
R5210x
PIN CONFIGURATIONS
• SOT-23-6W
• HSON-6
6
5
4
6
5
4
(Mark side)
(Mark side)
1
2
3
1
2
3
R5210Nxxxx
R5210Dxxxx
PIN DESCRIPTION
Pin No.
Symbol
Description
2XWSXWꢈ3LQꢈRIꢈ9ROWDJHꢈ5HJXODWRU
R5210N R5210D
ꢂ
ꢁ
ꢆ
ꢇ
ꢀ
ꢍ
ꢀ
ꢇ
ꢆ
ꢂ
ꢁ
ꢍ
9287ꢀ
9'287
9287ꢁ
/[
2XWSXWꢈ3LQꢈRIꢈ9ROWDJHꢈ'HWHFWRUꢈ*1ꢉFKDQQHOꢈRSHQꢉGUDLQꢈRXWSXWꢈW\SH,
'&ꢅ'&ꢈFRQYHUWHUꢈ6WHSꢉGRZQꢈ2XWSXWꢈPRQLWRULQJꢈ3LQ
6ZLWFKLQJꢈ3LQꢈ*3ꢉFKDQQHOꢈRSHQꢉGUDLQꢈRXWSXWꢈW\SH,
ꢑURXQGꢈ3LQ
ꢑ1'
9,1
9ROWDJHꢈ6XSSO\ꢈ3LQ
ABSOLUTE MAXIMUM RATINGS
ꢑ1' ꢃ9
Symbol
9,1
Item
Rating
ꢍꢄꢀ
Unit
9,1ꢈ3LQꢈ9ROWDJH
/[ꢈ3LQꢈ9ROWDJH
9
9
9/;
ꢉꢃꢄꢆa9,1ꢒꢃꢄꢆ
ꢉꢃꢄꢆa9,1ꢒꢃꢄꢆ
ꢉꢃꢄꢆa9,1ꢒꢃꢄꢆ
ꢉꢃꢄꢆa9,1ꢒꢃꢄꢆ
ꢋꢃꢃ
9287ꢁ
9287ꢀ
9'287
ꢊ/;
9287ꢁꢈ3LQꢈ9ROWDJH
9287ꢀꢈ3LQꢈ9ROWDJH
9
9
9'287ꢈ3LQꢈ9ROWDJH
9
/[ꢈ3LQꢈ2XWSXWꢈ&XUUHQW
9287ꢀꢈ3LQꢈ2XWSXWꢈ&XUUHQW
3RZHUꢈ'LVVLSDWLRQꢈ*627ꢉꢁꢆꢉꢍ:,
P$
P$
P:
ꢊ287ꢀ
3'
ꢁꢀꢃ
ꢁꢀꢃ
3RZHUꢈ'LVVLSDWLRQ
3'
ꢇꢃꢃ
P:
*+621ꢉꢍꢅ8QGHUꢈ'HYHORSPHQW,
7RSW
7VWJ
2SHUDWLQJꢈ7HPSHUDWXUHꢈ5DQJH
6WRUDJHꢈ7HPSHUDWXUHꢈ5DQJH
ꢉꢇꢃaꢒꢋꢀ
&
&
ꢉꢀꢀaꢒꢂꢁꢀ
3
R5210x
ELECTRICAL CHARACTERISTICS
• R5210N001C
7RSW ꢁꢀ&
Symbol
9,1
Item
2SHUDWLQJꢈꢊQSXWꢈ9ROWDJH
6XSSO\ꢈ&XUUHQW
Conditions
Min.
Typ.
Max.
Unit
9
ꢁꢄꢌ
ꢀꢄꢀ
ꢊ''
9,1 ꢀꢄꢃ9-ꢈ9287ꢁ ꢀꢄꢃ9
ꢂꢀꢃ
ꢆꢃꢃ
$
89/2ꢈ'HWHFWRUꢈ7KUHVKROG
9ROWDJH
989/2ꢀ
ꢉꢃꢄꢂꢀ
989/2ꢁ
989/2ꢀ
ꢁꢄꢂꢀ
ꢁꢄꢆꢀ
9
9
89/2ꢈ5HOHDVHꢈ9ROWDJH
ꢁꢄꢀꢃ
ꢁꢄꢍꢀ
DC/DC Part
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
9287ꢁ
'&ꢅ'&ꢈ2XWSXWꢈ9ROWDJH
9,1 ꢀꢄꢃ9-ꢈDWꢈQRꢈORDG
ꢁꢄꢍꢇꢍ
ꢁꢄꢌꢃꢃ
ꢁꢄꢌꢀꢇ
9
∆9287ꢁ
ꢅ∆7
'&ꢅ'&ꢈ2XWSXWꢈ9ROWDJH
7HPSHUDWXUHꢈ&RHIILFLHQW
SSP
ꢅ&
ꢉꢇꢃ&≤7RSW ≤ꢋꢀ&
9,1 ꢀꢄꢃ9
ꢂꢃꢃ
ꢋꢃꢃ
I26&
2VFLOODWRUꢈ)UHTXHQF\
ꢍꢇꢃ
ꢏꢍꢃ
N+]
2VFLOODWRUꢈ)UHTXHQF\
N+]
ꢅ&
∆I26&ꢅ∆7
ꢉꢇꢃ&≤7RSW ≤ꢋꢀ&
ꢂꢄꢀ
7HPSHUDWXUHꢈ&RHIILFLHQW
5/;
ꢊ/;OHDN
ꢊ/;OLP
/[ꢈRQꢈ5HVLVWDQFH
/[ꢈ/HDNDJHꢈ&XUUHQW
/[ꢈ&XUUHQWꢈ/LPLW
9,1 ꢀꢄꢃ9-ꢈꢊ/; ꢂꢃꢃP$
9,1 9287ꢁ ꢀꢄꢃ9-ꢈ9/; ꢃ9
9,1 ꢀꢄꢃ9
ꢃꢄꢇ
ꢃꢄꢃꢂ
ꢌꢀꢃ
ꢃꢄꢋ
Ω
$
P$
?
ꢀꢄꢃꢃ
ꢍꢃꢃ
ꢂꢃꢃ
ꢃꢄꢌ
0D[GW\ 0D[LPXPꢈGXW\ꢈF\FOH
7VWDUW
6RIWꢉVWDUWꢈ7LPH
9,1 ꢀꢄꢃ9
ꢁꢄꢃ
ꢀꢄꢃ
PV
VR part
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
9287ꢀ
95ꢈ2XWSXWꢈ9ROWDJH
9,1 ꢀꢄꢃ9-ꢈꢊ287ꢀ ꢂꢃP$
ꢆꢄꢆꢆꢁ
ꢆꢄꢇꢃꢃ
ꢆꢄꢇꢍꢋ
9
0D[LPXPꢈ2XWSXWꢈ&XUUHQWꢈRI
95
ꢊ287ꢀ
9,1 ꢀꢄꢃ9
ꢁꢃꢃ
P$
95(*ꢀ
9',)ꢀ
ꢊ/,0ꢀ
95ꢈ/RDGꢈ5HJXODWLRQ
'URSRXWꢈ9ROWDJH
9,1 ꢀꢄꢃ9-ꢈꢂP$≤ꢊ287ꢀ≤ꢋꢃP$
ꢊ287ꢀ ꢂꢃꢃP$
ꢆꢃ
ꢃꢄꢁ
ꢀꢃ
ꢌꢃ
P9
9
ꢃꢄꢆ
6KRUWꢈ&XUUHQWꢈ/LPLW
9287ꢀ ꢃ9
P$
∆9287ꢀ
ꢅ∆7
95ꢈ2XWSXWꢈ9ROWDJHꢈ7HPSHUDWXUH
&RHIILFLHQW
SSP
ꢅ&
ꢉꢇꢃ&≤7RSW ≤ꢋꢀ&
ꢂꢃꢃ
4
R5210x
VD part
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
ꢉ9'(7
9'ꢈ'HWHFWRUꢈ7KUHVKROG
ꢇꢄꢃꢏꢀ
ꢇꢄꢁꢃꢃ
ꢇꢄꢆꢃꢀ
9
9'ꢈ'HWHFWRUꢈ7KUHVKROG
7HPSHUDWXUHꢈ&RHIILFLHQW
SSP
ꢅ&
∆ꢉ9'(7ꢅ∆7
ꢉꢇꢃ&≤7RSW ≤ꢋꢀ&
ꢂꢃꢃ
ꢉ9'(7
9+<6
+\VWHUHVLVꢈ5DQJH
9
×ꢃꢄꢃꢀ
9'ꢈ2XWSXWꢈ'HOD\ꢈ7LPHꢈIRUꢈ5Hꢉ
OHDVH
W3/+
ꢊ'287/
ꢀ
ꢁ
ꢂꢃ
ꢌ
ꢁꢃ
ꢂꢀ
PV
9'287ꢈ´/µꢈ2XWSXWꢈ&XUUHQW
9,1 ꢁꢄꢃ9-ꢈ9'287 ꢃꢄꢂ9
P$
TYPICAL APPLICATION AND APPLICATION HINTS
• R5210NxxxC
-
C3
+
OUT2
R1
V
V
V
V
V
OUT2
DOUT
OUT1
VIN
C1
DOUT
GND
L
X
-
+
C2
V
OUT1
L1
D1
Examples of Components
ꢊQGXFWRUꢈ/ꢂ ꢎ /4+ꢇ&ꢈ*0XUDWD-ꢈꢂꢃ+,ꢈRUꢈ/'5ꢍꢀꢀꢆꢂꢁ7ꢈ*7'.,
6KRWWN\ꢈ'LRGHꢈ'ꢂ ꢎ 5%ꢇꢏꢂ'ꢈ*5RKP,ꢈRUꢈ(3ꢃꢀ4ꢃꢆ/ꢈ*1LKRQꢈꢊQWHU,
3XOOꢉXSꢈ5HVLVWRUꢈ5ꢂ ꢎ ꢀꢃNΩ
&DSDFLWRUV
ꢎ &ꢂ ꢂꢃ)ꢈ*&HUDPLFꢈ&DSDFLWRU,ꢈꢈꢈ&ꢁꢎꢈꢁꢁ)ꢈ*7DQWDOXPꢈ&DSDFLWRU,ꢈꢈꢈ&ꢆꢎꢈꢂꢃ)ꢈ*7DQWDOXPꢈ&DSDFLWRU,
:KHQꢈ\RXꢈXVHꢈWKHVHꢈꢊ&V-ꢈFRQVLGHUꢈWKHꢈIROORZLQJꢈLVVXHVꢐ
• 6HWꢈH[WHUQDOꢈFRPSRQHQWVꢈDVꢈFORVHꢈDVꢈSRVVLEOHꢈWRꢈWKHꢈꢊ&ꢈDQGꢈPLQLPL]HꢈWKHꢈFRQQHFWLRQꢈEHWZHHQꢈWKHꢈFRPSRQHQWVꢈDQG
WKHꢈꢊ&ꢄꢈꢊQꢈSDUWLFXODU-ꢈDꢈFDSDFLWRUꢈVKRXOGꢈEHꢈFRQQHFWHGꢈWRꢈEHWZHHQꢈ9,1ꢈDQGꢈꢑ1'ꢈZLWKꢈWKHꢈPLQLPXPꢈFRQQHFWLRQꢄꢈꢈ0DNH
VXIILFLHQWꢈJURXQGLQJ-ꢈDQGꢈUHLQIRUFHꢈVXSSO\LQJꢄꢈ$ꢈODUJHꢈVZLWFKLQJꢈFXUUHQWꢈIORZVꢈWKURXJKꢈWKHꢈFRQQHFWLRQꢈRIꢈSRZHUꢈVXSꢉ
SO\-ꢈDQꢈLQGXFWRUꢈDQGꢈWKHꢈFRQQHFWLRQꢈRIꢈ9287ꢁꢄꢈꢊIꢈWKHꢈLPSHGDQFHꢈRIꢈWKHꢈFRQQHFWLRQꢈRIꢈSRZHUꢈVXSSO\ꢈRUꢈJURXQGꢈLVꢈKLJK-
WKHꢈYROWDJHꢈOHYHOꢈRIꢈSRZHUꢈVXSSO\ꢈRIꢈWKHꢈꢊ&ꢈIOXFWXDWHVꢈZLWKꢈWKHꢈVZLWFKLQJꢈFXUUHQWꢄꢈ7KLVꢈPD\ꢈFDXVHꢈXQVWDEOHꢈRSHUDWLRQ
RIꢈWKHꢈꢊ&ꢄ
5
R5210x
• 8VHꢈDꢈFDSDFLWRUꢈZLWKꢈDꢈFDSDFLW\ꢈRIꢈꢂꢃ)ꢈRUꢈPRUHꢈIRUꢈ9,1ꢈDQGꢈꢑ1'-ꢈDQGꢈZLWKꢈORZꢈ(65ꢈFHUDPLFꢈW\SHꢄꢈꢊQꢈWHUPVꢈRIꢈ9287ꢁ-
XVHꢈDꢈFDSDFLWRUꢈZLWKꢈDꢈFDSDFLW\ꢈRIꢈꢁꢁ)ꢈRUꢈPRUH-ꢈDQGꢈZLWKꢈJRRGꢈKLJKꢈIUHTXHQF\ꢈFKDUDFWHULVWLFVꢈVXFKꢈDVꢈWDQWDOXPꢈFDꢉ
SDFLWRUVꢄ
• &KRRVHꢈDQꢈLQGXFWRUꢈWKDWꢈKDVꢈVXIILFLHQWO\ꢈVPDOOꢈ'ꢄ&ꢄꢈUHVLVWDQFHꢈDQGꢈODUJHꢈDOORZDEOHꢈFXUUHQWꢈDQGꢈZKLFKꢈLVꢈKDUGꢈWRꢈUHDFK
PDJQHWLFꢈVDWXUDWLRQꢄꢈꢊIꢈWKHꢈYDOXHꢈRIꢈLQGXFWDQFHꢈRIꢈDQꢈLQGXFWRUꢈLVꢈH[WUHPHO\ꢈVPDOO-ꢈWKHꢈꢊ/;-ꢈZKLFKꢈIORZVꢈWKURXJKꢈ/[
WUDQVLVWRUꢈDQGꢈDQꢈLQGXFWRU-ꢈPD\ꢈH[FHHGꢈWKHꢈDEVROXWHꢈPD[LPXPꢈUDWLQJꢈDWꢈWKHꢈPD[LPXPꢈORDGLQJꢄ
8VHꢈDQꢈLQGXFWRUꢈZLWKꢈDSSURSULDWHꢈLQGXFWDQFHꢄ
• 8VHꢈDꢈGLRGHꢈRIꢈDꢈ6FKRWWN\ꢈW\SHꢈZLWKꢈKLJKꢈVZLWFKLQJꢈVSHHG-ꢈDQGꢈDOVRꢈSD\ꢈDWWHQWLRQꢈWRꢈLWVꢈFXUUHQWꢈFDSDFLW\ꢄ
• ꢊIꢈWKHꢈVSLNHꢈQRLVHꢈRIꢈ/[ꢈSLQꢈLVꢈWRRꢈODUJH-ꢈPDNHꢈVQXEꢈFLUFXLWꢈ*VXFKꢈDVꢈVHULDOꢈFRQQHFWLRQꢈRIꢈ&5,ꢈEHWZHHQꢈ/[ꢈDQGꢈꢑ1'-
WKHQꢈWKHꢈQRLVHꢈZLOOꢈEHꢈUHGXFHGꢄꢈ7KHꢈWLPHꢈFRQVWDQWꢈRIꢈWKHꢈ&5ꢈGHSHQGVꢈRQꢈWKHꢈDFWXDOꢈ3&%-ꢈVRꢈHYDOXDWHꢈLWꢈRQꢈWKHꢈDFWXDO
3&%ꢄ
• ꢊIꢈWKHꢈORDGꢈFXUUHQWꢈRIꢈWKHꢈYROWDJHꢈUHJXODWRUꢈLVꢈVPDOO-ꢈEHFDXVHꢈRIꢈWKHꢈVZLWFKLQJꢈQRLVHꢈRIꢈ'&ꢅ'&ꢈFRQYHUWHU-ꢈWKHꢈRXWSXW
YROWDJHꢈRIꢈ9287ꢀꢈPD\ꢈEHꢈODUJHꢄꢈ7RꢈDYRLGꢈWKLV-ꢈXVHꢈWKHꢈYROWDJHꢈUHJXODWRUꢈZLWKꢈDꢈORDGꢈFXUUHQWꢈDWꢈOHDVWꢈꢂP$ꢄ
✰
7KHꢈSHUIRUPDQFHꢈRIꢈSRZHUꢈVRXUFHꢈFLUFXLWVꢈXVLQJꢈWKHVHꢈꢊ&VꢈH[WUHPHO\ꢈGHSHQGVꢈXSRQꢈWKHꢈSHULSKHUDOꢈFLUFXLWVꢄ
3D\ꢈDWWHQWLRQꢈLQꢈWKHꢈVHOHFWLRQꢈRIꢈWKHꢈSHULSKHUDOꢈFLUFXLWVꢄꢈꢊQꢈSDUWLFXODU-ꢈGHVLJQꢈWKHꢈSHULSKHUDOꢈFLUFXLWVꢈLQꢈDꢈZD\ꢈWKDW
WKHꢈYDOXHVꢈVXFKꢈDVꢈYROWDJH-ꢈFXUUHQW-ꢈDQGꢈSRZHUꢈRIꢈHDFKꢈFRPSRQHQW-ꢈ3&%ꢈSDWWHUQVꢈDQGꢈWKHꢈꢊ&ꢈGRꢈQRWꢈH[FHHGꢈWKHLU
UHVSHFWHGꢈUDWHGꢈYDOXHVꢄ
6
R5210x
OPERATION of step-down DC/DC converter and Output Current
7KHꢈVWHSꢉGRZQꢈ'&ꢅ'&ꢈFRQYHUWHUꢈFKDUJHVꢈHQHUJ\ꢈLQꢈWKHꢈLQGXFWRUꢈZKHQꢈ/[ꢈWUDQVLVWRUꢈLVꢈ21-ꢈDQGꢈGLVFKDUJHVꢈWKHꢈHQꢉ
HUJ\ꢈIURPꢈWKHꢈLQGXFWRUꢈZKHQꢈ/[ꢈWUDQVLVWRUꢈLVꢈ2))ꢈDQGꢈFRQWUROVꢈZLWKꢈOHVVꢈHQHUJ\ꢈORVV-ꢈVRꢈWKDWꢈDꢈORZHUꢈRXWSXWꢈYROWDJH
WKDQꢈWKHꢈLQSXWꢈYROWDJHꢈLVꢈREWDLQHGꢄꢈ7KHꢈRSHUDWLRQꢈZLOOꢈEHꢈH[SODLQHGꢈZLWKꢈUHIHUHQFHꢈWRꢈWKHꢈIROORZLQJꢈGLDJUDPVꢎ
<Basic Circuits>
<Current through L>
ILmax
i1
I
OUT
ILxmin
topen
L
Lx Tr
SD
VIN
VOUT
i2
CL
ton
toff
T=1/fosc
6WHSꢈꢂ ꢎ /[ꢈ7UꢄꢈWXUQVꢈRQꢈDQGꢈFXUUHQWꢈꢊ/ꢈ* Lꢂ,ꢈIORZV-ꢈDQGꢈHQHUJ\ꢈLVꢈFKDUJHGꢈLQWRꢈ&/ꢄꢈ$WꢈWKLVꢈPRPHQW-ꢈꢊ/ꢈLQFUHDVHVꢈIURP
ꢊ/PLQꢈ* ꢃ,ꢈWRꢈUHDFKꢈꢊ/PD[ꢈLQꢈSURSRUWLRQꢈWRꢈWKHꢈRQꢉWLPHꢈSHULRGꢈ*WRQ,ꢈRIꢈ/;ꢈ7Uꢄ
6WHSꢈꢁ ꢎ :KHQꢈ/[ꢈ7UꢄꢈWXUQVꢈRII-ꢈ6FKRWWN\ꢈGLRGHꢈ*6',ꢈWXUQVꢈRQꢈLQꢈRUGHUꢈWKDWꢈ/ꢈPDLQWDLQVꢈꢊ/ꢈDWꢈꢊ/PD[-ꢈDQGꢈFXUUHQWꢈꢊ/
* Lꢁ,ꢈIORZVꢄ
6WHSꢈꢆ ꢎ ꢊ/ꢈGHFUHDVHVꢈJUDGXDOO\ꢈDQGꢈUHDFKHVꢈꢊ/PLQꢈDIWHUꢈDꢈWLPHꢈSHULRGꢈRIꢈWRSHQ-ꢈDQGꢈ6'ꢈWXUQVꢈRII-ꢈSURYLGHGꢈWKDWꢈLQꢈWKH
FRQWLQXRXVꢈPRGH-ꢈQH[WꢈF\FOHꢈVWDUWVꢈEHIRUHꢈꢊ/ꢈEHFRPHVꢈWRꢈꢃꢈEHFDXVHꢈWRIIꢈWLPHꢈLVꢈQRWꢈHQRXJKꢄꢈꢊQꢈWKLVꢈFDVH-ꢈꢊ/
YDOXHꢈLVꢈIURPꢈWKLVꢈꢊ/PLQꢈ*!ꢃ,ꢄ
ꢊQꢈWKHꢈFDVHꢈRIꢈ3:0ꢈFRQWUROꢈV\VWHP-ꢈWKHꢈRXWSXWꢈYROWDJHꢈLVꢈPDLQWDLQHGꢈE\ꢈFRQWUROOLQJꢈWKHꢈRQꢉWLPHꢈSHULRGꢈ*WRQ,-ꢈZLWK
WKHꢈRVFLOODWRUꢈIUHTXHQF\ꢈ*IRVF,ꢈEHLQJꢈPDLQWDLQHGꢈFRQVWDQWꢄ
7
R5210x
• Discontinuous Conduction Mode and Continuous Conduction Mode
7KHꢈPD[LPXPꢈYDOXHꢈ*ꢊ/PD[,ꢈDQGꢈWKHꢈPLQLPXPꢈYDOXHꢈ*ꢊ/PLQ,ꢈFXUUHQWꢈZKLFKꢈIORZꢈWKURXJKꢈWKHꢈLQGXFWRUꢈLVꢈWKHꢈVDPH
DVꢈWKRVHꢈZKHQꢈ/[ꢈ7UꢄꢈWXUQVꢈRQꢈDQGꢈZKHQꢈLWꢈWXUQVꢈRIIꢄ
7KHꢈGLIIHUHQFHꢈEHWZHHQꢈꢊ/PD[ꢈDQGꢈꢊ/PLQ-ꢈZKLFKꢈLVꢈUHSUHVHQWHGꢈE\ꢈ∆ꢊꢐ
∆ꢊ ꢊ/PD[ꢉꢊ/PLQ 9287×WRSHQꢅ/ *9,1ꢉ9287,×WRQꢅ/ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢂ
:KHUH- 7 ꢂꢅIRVF WRQꢒWRII
GXW\ꢈ*?, WRQꢅ7×ꢂꢃꢃ WRQ×IRVF×ꢂꢃꢃ
WRSHQ≤WRII
ꢊQꢈ(TXDWLRQꢈꢂ-ꢈ9287×WRSHQꢅ/ꢈDQGꢈ*9,1ꢉ9287,×WRQꢅ/ꢈDUHꢈUHVSHFWLYHO\ꢈVKRZQꢈWKHꢈFKDQJHꢈRIꢈWKHꢈFXUUHQWꢈDWꢈ21-ꢈDQGꢈWKH
FKDQJHꢈRIꢈWKHꢈFXUUHQWꢈDWꢈ2) ꢄ
:KHQꢈWKHꢈRXWSXWꢈFXUUHQWꢈ*ꢊ287,ꢈLVꢈUHODWLYHO\ꢈVPDOO-ꢈWRSHQꢈꢓꢈWRIIꢈDVꢈLOOXVWUDWHGꢈLQꢈWKHꢈDERYHꢈGLDJUDPꢄꢈꢊQꢈWKLVꢈFDVH-ꢈWKH
HQHUJ\ꢈLVꢈFKDUJHGꢈLQꢈWKHꢈLQGXFWRUꢈGXULQJꢈWKHꢈWLPHꢈSHULRGꢈRIꢈWRQꢈDQGꢈLVꢈGLVFKDUJHGꢈLQꢈLWVꢈHQWLUHO\ꢈGXULQJꢈWKHꢈWLPHꢈSHULRG
RIꢈWRII-ꢈWKHUHIRUHꢈꢊ/PLQꢈEHFRPHVꢈWRꢈ]HURꢈ*ꢊ/PLQ ꢃ,ꢄꢈ:KHQꢈꢊ287ꢈLVꢈJUDGXDOO\ꢈLQFUHDVHG-ꢈHYHQWXDOO\-ꢈWRSHQꢈEHFRPHVꢈWR
WRIIꢈ*WRSHQ WRII,-ꢈDQGꢈZKHQꢈꢊ287ꢈLVꢈIXUWKHUꢈLQFUHDVHG-ꢈꢊ/PLQꢈEHFRPHVꢈODUJHUꢈWKDQꢈ]HURꢈ*ꢊ/PLQ!ꢃ,ꢄꢈ7KHꢈIRUPHUꢈPRGHꢈLV
UHIHUUHGꢈWRꢈDVꢈWKHꢈGLVFRQWLQXRXVꢈPRGHꢈDQGꢈWKHꢈODWWHUꢈPRGHꢈLVꢈUHIHUUHGꢈWRꢈDVꢈFRQWLQXRXVꢈPRGHꢄ
ꢊQꢈWKHꢈFRQWLQXRXVꢈPRGH-ꢈZKHQꢈ(TXDWLRQꢈꢂꢈLVꢈVROYHGꢈIRUꢈWRQꢈDQGꢈDVVXPHGꢈWKDWꢈWKHꢈVROXWLRQꢈLVꢈWRQF-
WRQF 7×9287ꢅ9,1 ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢁ
:KHQꢈWRQꢓWRQF-ꢈWKHꢈPRGHꢈLVꢈWKHꢈGLVFRQWLQXRXVꢈPRGH-ꢈDQGꢈZKHQꢈWRQ WRQF-ꢈWKHꢈPRGHꢈLVꢈWKHꢈFRQWLQXRXVꢈPRGHꢄ
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
:KHQꢈ/[ꢈ7UꢄꢈLVꢈ´21µꢎ
*:KHUHLQ-ꢈ5LSSOHꢈ&XUUHQWꢈ3ꢉ3ꢈYDOXHꢈLVꢈGHVFULEHGꢈDVꢈꢊ53-ꢈ21ꢈUHVLVWDQFHꢈRIꢈ/;ꢈ7UꢄꢈLVꢈGHVFULEHGꢈDVꢈ53ꢈWKHꢈGLUHFWꢈFXUUHQW
RIꢈWKHꢈLQGXFWRUꢈLVꢈGHVFULEHGꢈDVꢈ5/ꢄ,
9,1 9287ꢒ*53ꢒ5/,×ꢊ287ꢒ/×ꢊ53ꢅWRQ ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢆ
:KHQꢈ/[ꢈ7UꢄꢈLVꢈ´2))µꢎ
/×ꢊ53ꢅWRII 9)ꢒ9287ꢒ5/×ꢊ287 ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢇ
3XWꢈ(TXDWLRQꢈꢇꢈWRꢈ(TXDWLRQꢈꢆꢈDQGꢈVROYHꢈIRUꢈ21ꢈGXW\-ꢈWRQꢅ*WRIIꢒWRQ, '21-
'21 *9287ꢒ9)ꢒ5/×ꢊ287,ꢅ*9,1ꢒ9)ꢉ53×ꢊ287,ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢀ
5LSSOHꢈ&XUUHQWꢈLVꢈDVꢈIROORZVꢐ
ꢊ53 *9,1ꢉ9287ꢉ53×ꢊ287ꢉ5/×ꢊ287,×'21ꢅIꢅ/ꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢍ
:KHUHLQ-ꢈSHDNꢈFXUUHQWꢈWKDWꢈIORZVꢈWKURXJKꢈ/-ꢈ/[ꢈ7Uꢄ-ꢈDQGꢈ6'ꢈLVꢈDVꢈIROORZVꢐ
ꢊ/PD[ ꢊ287ꢒꢊ53ꢅꢁꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄꢄ(TXDWLRQꢈꢌ
&RQVLGHUꢈꢊ/PD[-ꢈFRQGLWLRQꢈRIꢈLQSXWꢈDQGꢈRXWSXWꢈDQGꢈVHOHFWꢈH[WHUQDOꢈFRPSRQHQWVꢄ
ꢀ
7KHꢈDERYHꢈH[SODQDWLRQꢈLVꢈGLUHFWHGꢈWRꢈWKHꢈFDOFXODWLRQꢈLQꢈDQꢈLGHDOꢈFDVHꢈLQꢈFRQWLQXRXVꢈPRGHꢄ
8
R5210x
Timing Chart
(-VDET+VHYS
)
-VDET
V
V
UVLO2
UVLO1
V
V
IN Voltage
Soft-start
Time
OUT1 Voltage
L
X
Voltage
VD Delay
for Release
VD Delay
for Release
V
DOUT Voltage
V
OUT2 Voltage
7KHꢈWLPLQJꢈFKDUWꢈZKLFKꢈLVꢈVKRZQꢈLQꢈWKHꢈSUHYLRXVꢈSDJHꢈGHVFULEHVꢈWKHꢈUHODWLRQꢈRIꢈVXSSO\ꢈYROWDJHꢈFKDQJHVꢈZLWKꢈWLPH
DQGꢈHDFKꢈRXWSXWꢈRIꢈ'&ꢅ'&ꢈFRQYHUWHU-ꢈYROWDJHꢈGHWHFWRU-ꢈDQGꢈYROWDJHꢈUHJXODWRUꢄ
(1) DC/DC converter
:KHQꢈWKHꢈSRZHUꢈWXUQVꢈRQꢈDQGꢈLQꢈWKHꢈFDVHꢈRIꢈULVLQJꢈWKHꢈ9,1ꢈYROWDJH-ꢈZKLOHꢈWKHꢈ9,1ꢈYROWDJHꢈLVꢈDWꢈ89/2ꢈUHOHDVHꢈOHYHO
*989/2ꢀ,ꢈRUꢈOHVV-ꢈWKHꢈRSHUDWLRQꢈRIꢈWKHꢈ'&ꢅ'&ꢈFRQYHUWHUꢈVWRSVꢈDQGꢈGRHVꢈQRWꢈPDNHꢈVZLWFKLQJ-ꢈWKHUHIRUHꢈ9287ꢁꢈYROWDJH
GRHVꢈQRWꢈULVHꢄ
:KHQꢈWKHꢈ9,1ꢈYROWDJHꢈEHFRPHVꢈ89/2ꢈUHOHDVHꢈOHYHOꢈRUꢈPRUH-ꢈWKHꢈ'&ꢅ'&ꢈFRQYHUWHUꢈVWDUWVꢈVRIWꢉVWDUWꢈRSHUDWLRQ-ꢈDQG
VWDUWꢈVZLWFKLQJ-ꢈWKHQꢈ9287ꢁꢈZLOOꢈULVHꢄꢈ$IWHUꢈWKHꢈVRIWꢉVWDUWꢈWLPH-ꢈLIꢈ9,1ꢈYROWDJHꢈEHFRPHVꢈVHWꢈ9287ꢁꢈOHYHOꢈRUꢈPRUH-ꢈ9287ꢁꢈZLOO
EHꢈ VHWWOHGꢈ DWꢈ 9287ꢁꢈVHWꢈRXWSXWꢈYROWDJHꢄꢈꢊIꢈ9,1ꢈYROWDJHꢈEHFRPHVꢈ89/2ꢈGHWHFWRUꢈ WKUHVKROGꢈ OHYHOꢈ *989/2ꢁ,ꢈ RUꢈ OHVV-ꢈ WKH
'&ꢅ'&ꢈFRQYHUWHUꢈVWRSVꢈVZLWFKLQJꢈWKHQꢈ/[ꢈWUDQVLVWRUꢈLQꢈWKHꢈꢊ&ꢈWXUQVꢈRIIꢄ
(2) Voltage Detector
ꢊIꢈWKHꢈ9,1ꢈYROWDJHꢈLVꢈDWꢈ9'ꢈGHWHFWRUꢈWKUHVKROGꢈOHYHOꢈRUꢈOHVV-ꢈWKHꢈ1ꢉFKDQQHOꢈWUDQVLVWRUꢈRIꢈ9'287ꢈSLQꢈWXUQVꢈRQꢈDQG
RXWSXWVꢈ´/µꢈWRꢈ9'287ꢈSLQꢄꢈ7KHQ-ꢈZKHQꢈWKHꢈ9,1ꢈYROWDJHꢈEHFRPHVꢈ9'ꢈGHWHFWRUꢈWKUHVKROGꢈOHYHOꢈꢒꢈLWVꢈK\VWHUHVLVꢈUDQJH
*ꢉ9'(7ꢒ9+<6,ꢈRUꢈPRUH-ꢈDIWHUꢈ9'ꢈGHOD\ꢈIRUꢈUHOHDVHꢈ*WS/+,ꢈSDVVLQJ-ꢈWKHꢈ1ꢉFKDQQHOꢈWUDQVLVWRUꢈLQVLGHꢈWKHꢈꢊ&ꢈWXUQVꢈRII-
9'287ꢈSLQꢈYROWDJHꢈUHDFKHVꢈWRꢈWKHꢈSXOOꢉXSꢈYROWDJHꢄꢈ%HVLGHV-ꢈWKHꢈUHOHDVHꢈFLUFXLWꢈIRUꢈ9'ꢈVWDUWVꢈDIWHUꢈVRIWꢉVWDUWꢈWLPH
DQGꢈXQGHUꢈWKLVꢈFRQGLWLRQ-ꢈ9,1ꢈYROWDJHꢈVKRXOGꢈEHꢈ*ꢉ9'(7ꢒ9+<6,ꢈRUꢈPRUHꢄ
9
R5210x
(3) Voltage Regulator
7KHꢈYROWDJHꢈUHJXODWRUꢈDOZD\VꢈRSHUDWHVꢈHYHQꢈLIꢈ89/2ꢈIXQFWLRQꢈZRXOGꢈZRUNꢄꢈ7KHUHIRUH-ꢈ9287ꢀꢈYROWDJHꢈLVꢈQHDUO\ꢈHTXDO
WRꢈ9,1ꢈYROWDJHꢄꢈ$FWXDOꢈYDOXHꢈGHSHQGVꢈRQꢈWKHꢈORDGꢈFXUUHQWꢄꢈ:KHQꢈWKHꢈ9,1ꢈYROWDJHꢈEHFRPHVꢈVHWꢈ9287ꢀꢈYROWDJHꢈRUꢈPRUH-
9287ꢀꢈYROWDJHꢈZLOOꢈEHꢈWKHꢈVHWꢈRXWSXWꢈYROWDJHꢄ
TEST CIRCUITS
A) Supply Current
B) UVLO Detector Threshold/ Released Voltage
OSCILLOSCOPE
V
IN
VIN
LX
A
V
OUT1
VOUT1
GND
GND
C) Lx Leakage Current
D) Lx On Resistance
VIN
LX
V
IN
LX
A
VOUT1
VOUT1
V
GND
GND
E) Lx Current Limit
F) VOUT1 Output Voltage
OSCILLOSCOPE
OSCILLOSCOPE
V
IN
L
X
VIN
LX
V
OUT1
V
OUT1
OUT2
V
GND
GND
10
R5210x
G) Oscillator Frequency, Soft-start Time
OSCILLOSCOPE
OSCILLOSCOPE
VOUT1
VIN
LX
VOUT1
GND
H) VOUT2 Output Voltage, Load Regulation, Dropout
Voltage, Current Limit, Short Current Limit
I) VDOUT Detector Threshold, Hysteresis Range,
VD Output Delay Time for Release
V
IN
LX
VIN
LX
VOUT1
V
OUT1
VOUT2
GND
VDOUT
GND
V
I
OUT2
OSCILLOSCOPE
J) VDOUT “L” Output Current
VIN
VOUT1
GND VDOUT
A
7\SLFDOꢈ&KDUDFWHULVWLFVꢈZHUHꢈREWDLQHGꢈZLWKꢈXVLQJꢈWKHꢈWHVWꢈFLUFXLWVꢈDVꢈIROORZVꢐ
7\SLFDOꢈ$SSOLFDWLRQꢈ&LUFXLWꢎꢈ7\SLFDOꢈ&KDUDFWHULVWLFVꢈꢂ,ꢈꢁ,ꢈꢂꢂ,ꢈꢂꢁ,
7HVWꢈ&LUFXLWꢈ) ꢎꢈ7\SLFDOꢈ&KDUDFWHULVWLFVꢈꢆ,
7HVWꢈ&LUFXLWꢈꢑ ꢎꢈ7\SLFDOꢈ&KDUDFWHULVWLFVꢈꢍ,ꢈꢌ,
7HVWꢈ&LUFXLWꢈ+ ꢎꢈ7\SLFDOꢈ&KDUDFWHULVWLFVꢈꢇ,ꢈꢏ,ꢈꢂꢃ,
7HVWꢈ&LUFXLWꢈꢊ ꢎꢈ7\SLFDOꢈ&KDUDFWHULVWLFVꢈꢀ,ꢈꢋ,
11
R5210x
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R5210N001C
2) Efficiency vs. Output Current
R5210N001C
L1=22
OUT1=2.7V, IOUT2=0mA
µ
H, C1=10
µ
F
L1=22
µ
H, C1=10µF
V
VOUT1=2.7V, IOUT2=0mA
2.8
2.75
2.7
100
90
80
70
60
50
40
30
20
10
0
VIN=4.5V
VIN=5.0V
VIN=5.5V
V
V
V
IN=4.5V
IN=5.0V
IN=5.5V
2.65
2.6
0
100
200
300
400
500
100
100
0
100
200
300
400
500
100
100
Output Current IOUT1(mA)
Output Current IOUT1(mA)
3) DC/DC Output Voltage vs. Temperature
4) VR Output Voltage vs. Temperature
R5210N001C
R5210N001C
2.80
3.50
2.75
2.70
2.65
2.60
3.45
3.40
3.35
3.30
-50
-25
0
25
50
75
-50
-25
0
25
50
75
Temperature Topt(˚C)
Temperature Topt(˚C)
5) Detector Threshold vs. Temperature
6) Oscillator Frequency vs. Temperature
R5210N001C
R5210N001C
4.4
1000
4.3
4.2
4.1
4.0
900
800
700
600
-50
-25
0
25
50
75
-50
-25
0
25
50
75
Temperature Topt(˚C)
Temperature Topt(˚C)
12
R5210x
7) Soft-start time vs. Temperature
8) Output Delay Time for Release VD vs. Temperature
R5210N001C
R5210N001C
4.0
20
16
12
8
3.0
2.0
1.0
0.0
4
0
-50
-50
-25
0
25
50
75
100
-25
0
25
50
75
100
Temperature Topt(˚C)
Temperature Topt(˚C)
9) VR Output Voltage vs. Output Current
10) VR Output Voltage vs. Output Current (zoomed)
R5210N001C
R5210N001C
4
3.43
3.5
3
3.42
3.41
3.4
2.5
2
3.39
3.38
3.37
3.36
1.5
1
0.5
0
0
50
100 150 200 250 300
0
50
100
150
200
Output Current IOUT2(mA)
Output Current IOUT2(mA)
11) Load Transient Response 1
12) Load Transient Response 2
L1=22
µ
H, C1=10
µF
L1=22
µ
H, C1=10
µF
V
OUT1=2.7V
VOUT1=2.7V
I
OUT1=200mA
IOUT1=200mA
I
OUT1=10mA
IOUT1=10mA
1
2
1
2
Ch1 500mV
Ch2 100mV
M 50.0
µs
Ch1
200mV
Ch1 500mV
Ch2 100mV
M 200
µ
s
Ch1
200mV
13
相关型号：
R5210D27A-TR
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
R5210D27A-TR-FA
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
R5210D28A-TR-FA
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
R5210D29A-TR-FA
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
R5210D30A-TR
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
R5210D30A-TR-FA
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
R5210D32A-TR
Switching Regulator, Current-mode, 0.7A, 960kHz Switching Freq-Max, CMOS, PDSO6, 0.90 MM HEIGHT, HSON-6
RICOH
©2020 ICPDF网 联系我们和版权申明