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TNY255PN 数据手册 - Power Integrations（帕沃英蒂格盛）

制造商:

Power Integrations（帕沃英蒂格盛）

分类:

AC-DC转换器

封装:

DIP-8

描述:

开关电源IC

Pictures:

3D模型

符号图

焊盘图

引脚图

产品图

页面导航:

典型应用电路图在P5

原理图在P2P11

封装尺寸在P15P16

功能描述在P2

应用领域在P18

电气规格在P13P14P15

导航目录

典型应用电路图在P5
原理图在P2 P11
封装尺寸在P15 P16
功能描述在P2
应用领域在P18
电气规格在P13 P14 P15

TNY255PN数据手册

Page:

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Rev E

02/12

TNY253/254/255

Figure 9. 1.3 W TV Standby Circuit using TNY253.

Figure 10. 10 W Standby Supply Circuit.

useofalowcostEE16coretransformeruptothe10Wlevel.

Figure10showsa5V,10Wcircuitforsuchanapplication.

Thecircuitoperatesfromthehigh-voltageDCsupplyalready

availablefromthemainpowersupply.CapacitorC1ltersthe

high-voltageDCsupply,andisnecessaryonlyifthereisalong

tracelengthfromthesourceoftheDCsupplytotheinputsof

thestandbycircuit.Thehigh-voltageDCbusisappliedtothe

primarywindingofT1inserieswiththeintegratedhigh-voltage

MOSFETinsidetheTNY255.ThediodeD1,capacitorC2and

resistorR1comprisetheclampcircuitthatlimitstheturn-off

voltagespikeontheTinySwitchDRAINpintoasafevalue.

ThesecondarywindingisrectiedandlteredbyD2andC4

toprovidethe5Vouput.Additionallteringisprovidedby

L1andC5.Theoutputvoltageisdeterminedbythesumofthe

optocouplerU2LEDforwarddrop(~1V)andZenerdiode

VR1voltage.TheresistorR2,maintainsabiascurrentthrough

theZenertoimproveitsvoltagetolerance.Fortightertolerance,

aTL431precisionreferenceICfeedbackcircuitmaybeused.

Cellular Phone Charger

TheTinySwitchiswellsuitedforapplicationsthatrequirea

constantvoltageandconstantcurrentoutput.TinySwitchis

alwayspoweredfromtheinputhigh-voltage,thereforeitdoes

notrequirebiaswindingforpower.Consequently,itsopera-

tionisnotdependentontheleveloftheoutputvoltage.This

allowsforconstantcurrentchargerdesignsthatworkdownto

zerovoltsontheoutput.

PI-2242-082898

TinySwitch

+ 5 V

RTN

0.01 μF

1 kV

0.1 μF

240 - 375

VDC

150 kΩ

1 W

LTV817

SB540

10 μH

2700 μF

6.3 V

220 μF

10 V

VR1

1N5229B

TNY255P

4700 pF

1 kV

68 Ω

1N4937

Optional

PI-2246-082898

DC IN

120 - 375

VDC

TinySwitch

–

+ 7.5 V

RTN

0.1 μF

1 kΩ

VR1

1N5235B

0.01 μF

1 kV

100 Ω

1/2 W

56 pF

1 kV

1N4934

15 μH

47 μF

10 V

330 μF

10 V

TNY253P

SFH615-2

680 pF

Y1 Safety

Optional

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