February 2012

Figure 1. Typical Standby Application.

ORDER

PART

NUMBER

85-265

VAC

230 VAC or

115 VAC

w/Doubler

Product Highlights

Lowest Cost, Low Power Switcher Solution

• LowercostthanRCC,discretePWMandotherintegrat-

ed/hybridsolutions

• Costeffectivereplacementforbulkylinearadapters

• Lowestcomponentcount

• SimpleON/OFFcontrol–noloopcompensationdevices

• Nobiaswinding–simpler,lowercosttransformer

• AllowssimpleRCtypeEMIfilterforupto2Wfrom

universalinputor4Wfrom115VACinput

Extremely Energy Efficient

• Consumesonly30/60mWat115/230VACwithnoload

• MeetsBlueAngel,EnergyStar,Energy2000and200mW

Europeancellphonerequirementsforstandby

• Saves$1to$4peryearinenergycosts(at$0.12/kWHr)

comparedtobulkylinearadapters

• Idealforcellularphonechargers,standbypowersuppliesfor

PC,TVandVCR,utilitymeters,andcordlessphones.

High Performance at Low Cost

• High-voltagepowered–idealforchargerapplications

• Veryhighloopbandwidthprovidesexcellenttransient

responseandfastturnonwithpracticallynoovershoot

• Currentlimitoperationrejectslinefrequencyripple

• Glitchfreeoutputwheninputisremoved

• Built-incurrentlimitandthermalprotection

• 44kHzoperation(TNY253/4)withsnubberclamp

reducesEMIandvideonoiseinTVsandVCRs

• Operateswithoptocouplerorbiaswindingfeedback

Description

TheTinySwitchfamilyusesabreakthroughdesigntoprovide

thelowestcost,highefficiency,off-lineswitchersolutionin

the0to10Wrange.Thesedevicesintegratea700Vpower

MOSFET, oscillator, high-voltage switched current source,

currentlimitandthermalshutdowncircuitry.Theystart-up

andrunonpowerderivedfromtheDRAINvoltage,eliminat-

ingtheneedforatransformerbiaswindingandtheassociated

circuitry.Andyet,theyconsumeonlyabout80mWatnoload,

from265VACinput.AsimpleON/OFFcontrolschemealso

eliminatestheneedforloopcompensation.

TNY253P

TNY254P

TinySwitch Selection Guide

PACKAGE

DIP-8

DIP-8

SMD-8

SMD-8

TNY253G

TNY255P

0-2 W

1-4 W

0-4 W

2-5 W

TNY255G

DIP-8

TNY254G

SMD-8

3.5-6.5 W

4-10 W

TheTNY253andTNY254switchat44kHztominimizeEMI

andtoallowasimplesnubberclamptolimitDRAINspike

voltage.Atthesametime,theyallowuseoflowcostEE16core

transformerstodeliverupto5W.TheTNY253isidenticalto

TNY254exceptforitslowercurrentlimit,whichreducesoutput

short-circuit current for applications under 2.5W.TNY255

useshigherswitchingrateof130kHztodeliverupto10W

fromthesamelowcostEE16coreforapplicationssuchasPC

standbysupply.AnEE13orEF13corewithsafetyspaced

bobbincanbeusedforapplicationsunder2.5W.Absenceof

abiaswindingeliminatestheneedfortaping/marginsinmost

applications,whentripleinsulatedwireisusedforthesecondary.

Thissimplifiesthetransformerconstructionandreducescost.

PI-2178-022699

Wide-Range

High-Voltage

DC Input

TinySwitch

D

S

EN

BP

+

–

+

–

DC

Output

Table 1. *Please refer to the Key Application Considerations section

for details.

Recommended Range

for Lowest System Cost*

TNY253/254/255

Energy Efficient, Low Power Off-line Switchers