6WHS0GRZQ#'&2'&#&RQYHUWHU

&RQWUROOHU#ZLWK#9ROWDJH#'HWHFWRU

545541#6(5,(6

$33/,&$7,21#0$18$/

NO 。 EA- 066-0006

降压型DC / DC转换器控制器

与电压检测器

545541#6(5,(6

概要

7KH#545541#6HULHV#DUH#3:0#VWHS0GRZQ#'&2'&#&RQYHUWHU#FRQWUROOHUV#HPEHGGHG#ZLWK#D#YROWDJH#GHWHFWRU/#ZLWK#ORZ

VXSSO\#FXUUHQW#E\#&026#SURFHVV1

(DFK#VWHS0GRZQ#'\u0026amp;2'\u0026amp;#FRQYHUWHU#LQ#WKHVH#,\u0026amp;V#FRQVLVWV#RI#DQ#RVFLOODWRU/#D#3:0#FRQWURO#FLUFXLW/#D#UHIHUHQFH#YROWDJH

XQLW/#DQ#HUURU#DPSOLILHU/#D#VRIW0VWDUW#FLUFXLW/#D#SURWHFWLRQ#FLUFXLW/#D#3:029)0#DOWHUQDWLYH#FLUFXLW/#D#FKLS#HQDEOH#FLUFXLW/

DQG#UHVLVWRUV#IRU#YROWDJH#GHWHFWLRQ1#$#ORZ#ULSSOH/#KLJK#HIILFLHQF\#VWHS0GRZQ#'&2'&#FRQYHUWHU#FDQ#EH#FRPSRVHG#RI#WKLV

,&#ZLWK#RQO\#IRXU#H[WHUQDO#FRPSRQHQWV/#RU#D#SRZHU0WUDQVLVWRU/#DQ#LQGXFWRU/#D#GLRGH#DQG#D#FDSDFLWRU1

7KH#RXWSXW#YROWDJH#RI#'&2'&#FRQYHUWHU#FDQ#EH#VXSHUYLVHG#E\#WKH#EXLOW0LQ#YROWDJH#GHWHFWRU1

:LWK#D#3:029)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 ＃ LPSURYHG1

$QG#WKH#3:029)0#DOWHUQDWLYH#FLUFXLW#LV#DQ#RSWLRQ/#LQ#WHUPV#RI#\u0026amp;#YHUVLRQ#DQG#'#YHUVLRQ/#WKH#FLUFXLW#LV#QRW#LQFOXGHG1

,I#WKH#WHUP#RI#PD[LPXP#GXW\#F\FOH#NHHSV#RQ#D#FHUWDLQ#WLPH/#WKH#HPEHGGHG#SURWHFWLRQ#FLUFXLW#ZRUNV1#7KHUH#DUH#WZR

W \\ SHV ＃ RI ＃ SURWHFWLRQ ＃ IXQFWLRQ1 ＃ 2QH ＃ LV ＃ ODWFK0W \\ SH ＃ SURWHFWLRQ ＃ FLUFXLW / ＃ DQG ＃ LW ＃ ZRUNV ＃ WR ＃ ODWFK ＃ DQ ＃ H [ WHUQDO ＃ 3RZHU ＃ 026 ＃ ZLWK

NHHSLQJ#LW#GLVDEOH1#7R#UHOHDVH#WKH#FRQGLWLRQ#RI#SURWHFWLRQ/#DIWHU#GLVDEOH#WKLV#,&#ZLWK#D#FKLS#HQDEOH#FLUFXLW/#HQDEOH#LW#DJDLQ/

RU#UHVWDUW#WKLV#,&#ZLWK#SRZHU0RQ1#7KH#RWKHU#LV#5HVHW0W\SH#SURWHFWLRQ#FLUFXLW/#DQG#LW#ZRUNV#WR#UHVWDUW#WKH#RSHUDWLRQ#ZLWK

VRIW0VWDUW#DQG#UHSHDW#WKLV#RSHUDWLRQ#XQWLO#PD[LPXP#GXW\#F\FOH#FRQGLWLRQ#LV#UHOHDVHG1#(LWKHU#RI#WKHVH#SURWHFWLRQ#FLUFXLWV

FDQ#EH#GHVLJQDWHG#E\#XVHUV*#UHTXHVW1

特点

： LGH ＃ 5DQJH ＃ RI ＃ ＃ 9ROWDJH111111111111111111111111111111111111111111111

5169#WR#46159

%XLOW0LQ#6RIW0VWDUW#)XQFWLRQ#DQG#WZR#FKRLFHV#RI#3URWHFWLRQ#)XQFWLRQ#+/DWFK0W\SH#RU#5HVHW0W\SH,

7ZR#FKRLFHV#RI#2VFLOODWRU#)UHTXHQF\11111111111111111111111111111111

633N+]/#833N+]

+ LJK ＃ （ IILFLHQF \\

111111111111111111111111111111111111111111111111111111111111111111

7<3

1#<3(

6WDQGE\#&XUUHQW

1111111111111111111111111111111111111111111111111111111111111111

7<3

1#3$

6HWWLQJ#2XWSXW#9ROWDJH

111111111111111111111111111111111111111111111111111111

6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#4189

WR#8139

+LJK#$FFXUDF\#2XWSXW#9ROWDJH

11111111111111111111111111111111111111111

±513(

6HWWLQJ ＃' HWHFWRU ＃ 7KUHVKROG ＃ 9ROWDJH111111111111111111111111111111111 6WHSZLVH ＃ VHWWLQJ ＃ ZLWK ＃ D＃ VWHS ＃ RI ＃ 3149 ＃ LQ ＃ WKH ＃ UDQJH ＃ RI ＃ 4159

WR#7189

+LJK#$FFXUDF\#'HWHFWRU#7KUHVKROG#9ROWDJH

11111111111111111111

±513(

/ RZ ＃ 7HPSHUDWXUH0'ULIW ＃ ＆放大器; RHIILFLHQW ＃ RI ＃ 2XWSXW ＃ 9ROWDJH1111 7 ： 3;

1#“433SSP2&

1

R1221N

应用

3RZHU#VRXUFH#IRU#KDQG0KHOG#FRPPXQLFDWLRQ#HTXLSPHQW/#FDPHUDV/#YLGHR#LQVWUXPHQWV#VXFK#DV#9&5V/#FDPFRUGHUV1

3RZHU#VRXUFH#IRU#EDWWHU\0SRZHUHG#HTXLSPHQW1

3RZHU#VRXUFH#IRU#KRXVHKROG#HOHFWULFDO#DSSOLDQFHV1

框图

OSC

V

IN

V

OUT

EXT

VREF

PWM / VFM

控制

保护

软启动

芯片使能

CE

VREF

VD

OUT

GND

2

R1221N

选购指南

,Q#WKH#545541#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#UHTXHVW1

7KH#VHOHFWLRQ#FDQ#EH#PDGH#E\#GHVLJQDWLQJ#WKH#SDUW#QXPEHU#DV#VKRZQ#EHORZ>

545541;;;;075

↑ ↑↑

EF

CODE

D

6HWWLQJ#2XWSXW#9ROWDJH#+9

287

,=

6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#4189#WR#8139#LV#SRVVLEOH1

6HWWLQJ#'HWHFWRU#7KUHVKROG#+09

'(7

,

E

6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#4159#WR#7189#LV#SRVVLEOH1

$#=#6139

'HVLJQDWLRQ#RI#2VFLOODWRU#)UHTXHQF\#DQG#2SWLRQDO#)XQFWLRQ

$ ＃ = ＃ 633N + ] / ＃ ZLWK ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ / DWFK0W \\ SH ＃ SURWHFWLRQ

％ ＃ = ＃ 833N + ] / ＃ ZLWK ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ / DWFK0W \\ SH ＃ SURWHFWLRQ

& ＃ = ＃ 633N + ] / ＃ ZLWKRXW ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ / DWFK0W \\ SH ＃ SURWHFWLRQ

F

' ＃ = ＃ 833N + ] / ＃ ZLWKRXW ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ / DWFK0W \\ SH ＃ SURWHFWLRQ

（ ＃ = ＃ 633N + ] / ＃ ZLWK ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ 5HVHW0W \\ SH ＃ SURWHFWLRQ

） ＃ = ＃ 833N + ] / ＃ ZLWK ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ 5HVHW0W \\ SH ＃ SURWHFWLRQ

* ＃ = ＃ 633N + ] / ＃ ZLWKRXW ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ 5HVHW0W \\ SH ＃ SURWHFWLRQ

+ ＃ = ＃ 833N + ] / ＃ ZLWKRXW ＃ D＃ 3 ： 029 ） 0 ＃ DOWHUQDWLYH ＃ FLUFXLW / ＃ 5HVHW0W \\ SH ＃ SURWHFWLRQ

目录

引脚配置

SOT-23-6W

6

5

4

V

OUT

GND CE

（标记侧）

EXT VD

OUT

V

IN

1

2

3

3

R1221N

引脚说明

PIN号

4

5

6

7

8

9

符号

(;7

9'

287

9

,1

& （

*1'

9

287

描述

([WHUQDO#7UDQVLVWRU#'ULYH#3LQ#+2XWSXW#7\SH#>#&026,

9ROWDJH#'HWHFWRU#2XWSXW#3LQ#+2XWSXW#7\SH#>#1FK#2SHQ#'UDLQ,

3RZHU#6XSSO\#3LQ

&KLS#(QDEOH#3LQ

*URXQG#3LQ

3LQ#IRU#0RQLWRULQJ#2XWSXW#9ROWDJH

绝对最大额定值

符号

9

,1

9

(;7

9

& （

9'

287

9

287

,

(;7

3'

7RSW

7VWJ

项

9

,1

#6XSSO\#9ROWDJH

(;7#3LQ#2XWSXW#9ROWDJH

&(#3LQ#,QSXW#9ROWDJH

9'

287

#3LQ#2XWSXW#9ROWDJH

9

287

#3LQ#,QSXW#9ROWDJH

(;7#3LQ#,QGXFWRU#'ULYH#2XWSXW#&XUUHQW

3RZHU#'LVVLSDWLRQ

2SHUDWLQJ#7HPSHUDWXUH#5DQJH

6WRUDJH#7HPSHUDWXUH#5DQJH

等级

48

03169

,1

.316

03169

,1

.316

031648

03169

,1

.316

“58

583

073.;8

088.458

单位

9

9

9

9

9

P$

P:

?? &

?? &

4