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TNY255P Datasheet(PDF) 5 Page - Power Integrations, Inc.

Part # TNY255P
Description  Energy Efficient, Low Power Off-line Switchers
Download  18 Pages
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TNY255P Datasheet(HTML) 5 Page - Power Integrations, Inc.

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TNY253/254/255
5
Rev E
02/12
Figure 6. TinySwitch Operation at Light Load.
Figure 7. TinySwitch Power-Up Timing Diagram.
Figure 8. TinySwitch Power Down Timing Diagram.
PI-2261-061198
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
BYPASS Pin Capacitor
TheBYPASSpinusesasmall0.1µFceramiccapacitorfor
decouplingtheinternalpowersupplyoftheTinySwitch.
Application Examples
Television Standby
TinySwitchisanidealsolutionforlowcost,highefficiency
standbypowersuppliesusedinconsumerelectronicproducts
suchasTVs.Figure9showsa7.5V,1.3Wflybackcircuitthat
usesTNY253forimplementingaTVstandbysupply.Thecircuit
operatesfromtheDChigh-voltagealreadyavailablefromthe
mainpowersupply.Thisinputvoltagecanrangefrom120to
375VDCdependingontheinputACvoltagerangethattheTV
isratedfor.CapacitorC1filtersthehigh-voltageDCsupply,
andisnecessaryonlyifthereisalongtracelengthfromthe
sourceoftheDCsupplytotheinputsoftheTVstandbycircuit.
Thehigh-voltageDCbusisappliedtotheseriescombination
oftheprimarywindingofT1andtheintegratedhigh-voltage
MOSFETinsidetheTNY253.Thelowoperatingfrequencyof
theTNY253(44kHz),allowsalowcostsnubbercircuitC2and
R1tobeusedinplaceofaprimaryclampcircuit.Inaddition
tolimitingtheDRAINturnoffvoltagespiketoasafevalue,
theRCsnubberalsoreducesradiatedvideonoisebylowering
thedv/dtoftheDRAINwaveform,whichiscriticalforvideo
applicationssuchasTVandVCR.OnfixedfrequencyPWM
andRCCcircuits,useofasnubberwillresultinanundesir-
ablefixedACswitchinglossthatisindependentofload.The
ON/OFFcontrolontheTinySwitcheliminatesthisproblem
by scaling the effective switching frequency and therefore,
switchinglosslinearlywithload.Thustheefficiencyofthe
supplystaysrelativelyconstantdowntoafractionofawattof
outputloading.
ThesecondarywindingisrectifiedandfilteredbyD1andC4to
createthe7.5Voutput.L1andC5provideadditionalfiltering.
Theoutputvoltageisdeterminedbythesumoftheoptocoupler
U2LEDforwarddrop(~1V)andZenerdiodeVR1voltage.
TheresistorR2,maintainsabiascurrentthroughtheZenerto
improveitsvoltagetolerance.
10 W Standby
TheTNY255isidealforstandbyapplicationsthatrequireup
to10Wofpowerfrom230VACor100/115VACwithdoubler
circuit.TheTNY255operatesat130kHzasopposedto44kHz
forTNY253/254.Thehigherfrequencyoperationallowsthe
V
DRAIN
V
IN
0.2
Time (ms)
.4
.6
.8
1
0 V
0 V
V
DRAIN
V
IN
12 V
12 V
0
100
Time (ms)
200
300
400
500
0 V
0 V


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