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TNY253P Datasheet(PDF) 3 Page - Power Integrations, Inc.

Part # TNY253P
Description  Energy Efficient, Low Power Off-line Switchers
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TNY253P Datasheet(HTML) 3 Page - Power Integrations, Inc.

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TNY253/254/255
3
Rev E
02/12
circuitissampledattherisingedgeoftheoscillatorClock
signal(atthebeginningofeachcycle).Ifitishigh,thenthe
powerMOSFETisturnedon(enabled)forthatcycle,otherwise
thepowerMOSFETremainsintheoffstate(cycleskipped).
Sincethesamplingisdoneonlyonceatthebeginningofeach
cycle,anysubsequentchangesattheENABLEpinduringthe
cycleareignored.
5.8 V Regulator
The5.8Vregulatorchargesthebypasscapacitorconnectedto
theBYPASSpinto5.8Vbydrawingacurrentfromthevoltage
ontheDRAIN,whenevertheMOSFETisoff.TheBYPASSpin
istheinternalsupplyvoltagenodefortheTinySwitch.When
theMOSFETison,theTinySwitchrunsoffoftheenergystored
inthebypasscapacitor.Extremelylowpowerconsumptionof
theinternalcircuitryallowstheTinySwitchtooperatecontinu-
ouslyfromthecurrentdrawnfromtheDRAINpin.Abypass
capacitorvalueof0.1µFissufficientforbothhighfrequency
de-couplingandenergystorage.
Undervoltage
TheundervoltagecircuitrydisablesthepowerMOSFETwhen
theBYPASSpinvoltagedropsbelow5.1V.OncetheBYPASS
pinvoltagedropsbelow5.1V,ithastorisebackto5.8Vto
enable(turn-on)thepowerMOSFET.
Hysteretic Over Temperature Protection
Thethermalshutdowncircuitrysensesthediejunctiontem-
perature.Thethresholdissetat135°Cwith70°Chysteresis.
When the junction temperature rises above this threshold
(135°C)thepowerMOSFETisdisabledandremainsdisabled
untilthediejunctiontemperaturefallsby70°C,atwhichpoint
itisre-enabled.
Current Limit
The current limit circuit senses the current in the power
MOSFET.Whenthiscurrentexceedstheinternalthreshold
(I
LIMIT),thepowerMOSFETisturnedofffortheremainderof
thatcycle.
The leading edge blanking circuit inhibits the current limit
comparatorforashorttime(t
LEB) after the power MOSFET
isturnedon.Thisleadingedgeblankingtimehasbeensetso
that current spikes caused by primary-side capacitance and
secondary-siderectifierreverserecoverytimewillnotcause
prematureterminationoftheswitchingpulse.
TinySwitch Operation
TinySwitchisintendedtooperateinthecurrentlimitmode.
Whenenabled,theoscillatorturnsthepowerMOSFETonatthe
beginningofeachcycle.TheMOSFETisturnedoffwhenthe
currentrampsuptothecurrentlimit.Themaximumon-time
oftheMOSFETislimitedtoDC
MAXbytheoscillator.Since
thecurrentlimitandfrequencyofagivenTinySwitchdevice
areconstant,thepowerdeliveredisproportionaltotheprimary
inductanceofthetransformerandisrelativelyindependentof
theinputvoltage.Therefore,thedesignofthepowersupply
involvescalculatingtheprimaryinductanceofthetransformer
forthemaximumpowerrequired.AslongastheTinySwitch
devicechosenisratedforthepowerlevelatthelowestinput
voltage,thecalculatedinductancewillrampupthecurrentto
thecurrentlimitbeforetheDC
MAXlimitisreached.
Enable Function
TheTinySwitchsensestheENABLEpintodeterminewhether
ornottoproceedwiththenextswitchcycleasdescribedearlier.
OnceacycleisstartedTinySwitchalwayscompletesthecycle
(evenwhentheENABLEpinchangesstatehalfwaythroughthe
cycle).Thisoperationresultsinapowersupplywhoseoutput
voltagerippleisdeterminedbytheoutputcapacitor,amountof
energyperswitchcycleandthedelayoftheENABLEfeedback.
TheENABLEsignalisgeneratedonthesecondarybycomparing
thepowersupplyoutputvoltagewithareferencevoltage.The
ENABLEsignalishighwhenthepowersupplyoutputvoltage
islessthanthereferencevoltage.
In a typical implementation, the ENABLE pin is driven by
anoptocoupler.Thecollectoroftheoptocouplertransistoris
connectedtotheENABLEpinandtheemitterisconnectedto
theSOURCEpin.TheoptocouplerLEDisconnectedinseries
with a Zener across the DC output voltageto be regulated.
Whentheoutputvoltageexceedsthetargetregulationvoltage
level(optocouplerdiodevoltagedropplusZenervoltage),the
optocouplerdiodewillstarttoconduct,pullingtheENABLE
pinlow.TheZenercouldbereplacedbyaTL431devicefor
improvedaccuracy.
TheENABLEpinpull-downcurrentthresholdisnominally
50µA,butissetto40µAtheinstantthethresholdisexceeded.
Thisisresetto50µAwhentheENABLEpull-downcurrent
dropsbelowthecurrentthresholdof40µA.
ON/OFF Control
TheinternalclockoftheTinySwitchrunsallthetime.Atthe
beginning of each clock cycle the TinySwitch samples the
ENABLEpintodecidewhetherornottoimplementaswitch
cycle.IftheENABLEpinishigh(<40µA),thenaswitching
cycletakesplace.IftheENABLEpinislow(greaterthan
50µA)thennoswitchingcycleoccurs,andtheENABLEpin
statusissampledagainatthestartofthesubsequentclockcycle.
AtfullloadTinySwitchwillconductduringthemajorityof
itsclockcycles(Figure4).Atloadslessthanfullload,the
TinySwitchwill“skip”morecyclesinordertomaintainvolt-
age regulation at the secondary output (Figure 5). At light
loadornoload,almostallcycleswillbeskipped(Figure6).
Asmallpercentageofcycleswillconducttosupportthepower
consumptionofthepowersupply.


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