www.德州仪器.com
ProgrammingtheTPS71501AdjustableLDORegulator
V
输出
V
REF
1
R1
R2
(3)
R1
V
输出
V
REF
1
R2
(4)
输出 voltAGE
程序编制 手册
输出
电压
R1 R2
1.8 v
2.8 v
5.0 v
0.499 m
Ω
1.33 m
Ω
3.16 m
Ω
1 m
Ω
1 m
Ω
1 m
Ω
地
FB
在 输出
V
在
V
输出
R
1
C
FB
R
2
TPS71501
V
输出
V
REF
1
R1
R2
0.1
µ
F 0.47
µ
F
PowertheMSP430Microcontroller
TPS715xx
SLVS338K–MAY2001–REVISEDSEPTEMBER2005
applicationinformation(持续)
TheoutputvoltageoftheTPS71501adjustableregulatorisprogrammedusinganexternalresistordivideras
showninFigure14.theoutputvoltageoperatingrangeis1.2vto15v,andiscalculatedusing:
在哪里:
•
V
REF
=1.205vtyp(theinternalreferencevoltage)
resistorsr1andr2shouldbechosenforapproximately1.5-µadividercurrent.lowervalueresistorscanbe
usedforimprovednoiseperformance,butthesolutionconsumesmorepower.higherresistorvaluesshouldbe
avoidedasleakagecurrentinto/outoffbacrossr1/r2createsanoffsetvoltagethatartificiallyin-
creases/decreasesthefeedbackvoltageandthuserroneouslydecreases/increasesv
输出
.therecommended
designprocedureistochooseR2=1M
Ω
tosetthedividercurrentat1.5µa,andthencalculater1using:
figure14.tps71501adjustableldoregulatorprogramming
severalversionsofthetps715xxareidealforpoweringthemsp430microcontroller.Table2showspotential
applicationsofsomevoltageversions.
table2.typicalmsp430applications
DEVICEV
输出
(典型值)应用
tps715191.9vv
输出,最小值
>1.800vrequiredbymanymsp430s.allowslowestpowerconsumptionoperation.
tps715232.3vv
输出,最小值
>2.200vrequiredbysomemsp430sflashoperation.
tps715303.0vv
输出,最小值
>2.700vrequiredbysomemsp430sflashoperation.
tps7153452.45vv
输出,最小值
<3.600vrequiredbysomemsp430s.allowshighestspeedoperation.
TheTPS715xxfamilyoffersmanyoutputvoltageversionstoallowdesignerstominimizethesupplyvoltagefor
theprocessingspeedrequiredofthemsp430.thisminimizesthesupplycurrentconsumedbythemsp430.
8
: 点此下载
