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TNY255G Datasheet(PDF) 4 Page - Power Integrations, Inc.

Part # TNY255G
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.

TNY255G Datasheet(HTML) 4 Page - Power Integrations, Inc.

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Rev E
02/12
TNY253/254/255
4
Figure 4. TinySwitch Operation at Heavy Load.
Figure 5. TinySwitch Operation at Medium Load.
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
PI-2255-061298
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
PI-2259-061298
TheresponsetimeofTinySwitchON/OFFcontrolschemeis
veryfastcomparedtonormalPWMcontrol.Thisprovideshigh
lineripplerejectionandexcellenttransientresponse.
Power Up/Down
TinySwitchrequiresonlya0.1µFcapacitorontheBYPASS
pin.Becauseofthesmallsizeofthiscapacitor,thepower-up
delayiskepttoanabsoluteminimum,typically0.3ms(Fig-
ure7).DuetothefastnatureoftheON/OFFfeedback,thereis
noovershootatthepowersupplyoutput.Duringpower-down,
thepowerMOSFETwillswitchuntiltherectifiedlinevoltage
dropstoapproximately12V.ThepowerMOSFETwillthen
remainoffwithoutanyglitches(Figure8).
Bias Winding Eliminated
TinySwitchdoesnotrequireabiaswindingtoprovidepower
to the chip.Instead it draws the power directly from the
DRAINpin(seeFunctionalDescriptionabove).Thishastwo
mainbenefits.Firstforanominalapplication,thiseliminates
thecostofanextrabiaswindingandassociatedcomponents.
Secondly,forchargerapplications,thecurrent-voltagechar-
acteristicoftenallowstheoutputvoltagetofalltolowvalues
whilestilldeliveringpower.Thistypeofapplicationnormally
requiresaforward-biaswindingwhichhasmanymoreassoci-
atedcomponents,noneofwhicharenecessarywithTinySwitch.
Current Limit Operation
EachswitchingcycleisterminatedwhentheDRAIN current
reachesthecurrentlimitoftheTinySwitch.Foragivenprimary
inductanceandinputvoltage,thedutycycleisconstant.How-
ever,dutycycledoeschangeinverselywiththeinputvoltage
providing“voltagefeed-forward”advantages:goodlineripple
rejectionandrelativelyconstantpowerdeliveryindependent
oftheinputvoltage.
44 kHz Switching Frequency (TNY253/254)
Switchingfrequency(withnocycleskipping)issetat44kHz.
Thisprovidesseveraladvantages.Athigherswitchingfrequen-
cies,thecapacitiveswitchinglossesareasignificantproportion
ofthepowerlossesinapowersupply.Athigherfrequencies,
thepreferredsnubbingschemesareRCDordiode-Zenerclamps.
However,duetothelowerswitchingfrequencyofTinySwitch,
itispossibletouseasimpleRCsnubber(andevenjustacapaci-
toralonein115VACapplicationsatpowerslevelsbelow4W).
Secondly,alowswitchingfrequencyalsoreducesEMIfiltering
requirements.At44kHz,thefirst,secondandthirdharmon-
icsareallbelow150kHzwheretheEMIlimitsarenotvery
restrictive.Forpowerlevelsbelow4Witispossibletomeet
worldwideEMIrequirementswithonlyresistiveandcapaci-
tivefilterelements(noinductorsorchokes).Thissignificantly
reducesEMIfiltercosts.
Finally,iftheapplicationrequiresstringentnoiseemissions
(suchasvideoapplications),thentheTNY253/254willallow
more effective use of diode snubbing (and other secondary
snubbingtechniques).Thelowerswitchingfrequencyallows
RCsnubberstobeusedtoreducenoise,withoutsignificantly
impactingtheefficiencyofthesupply.
130 kHz Switching Frequency (TNY255)
The switching frequency (with no cycle skipping) is set at
130kHz.ThisallowstheTNY255todeliver10Wwhilestill
usingthesamesize,lowcosttransformer(EE16)asusedby
theTNY253/254forlowerpowerapplications.


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