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TNY253 Datasheet(PDF) 6 Page - Power Integrations, Inc.

Part # TNY253
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.

TNY253 Datasheet(HTML) 6 Page - Power Integrations, Inc.

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Rev E
02/12
TNY253/254/255
6
Figure 9. 1.3 W TV Standby Circuit using TNY253.
Figure 10. 10 W Standby Supply Circuit.
useofalowcostEE16coretransformeruptothe10Wlevel.
Figure10showsa5V,10Wcircuitforsuchanapplication.
Thecircuitoperatesfromthehigh-voltageDCsupplyalready
availablefromthemainpowersupply.CapacitorC1filtersthe
high-voltageDCsupply,andisnecessaryonlyifthereisalong
tracelengthfromthesourceoftheDCsupplytotheinputsof
thestandbycircuit.Thehigh-voltageDCbusisappliedtothe
primarywindingofT1inserieswiththeintegratedhigh-voltage
MOSFETinsidetheTNY255.ThediodeD1,capacitorC2and
resistorR1comprisetheclampcircuitthatlimitstheturn-off
voltagespikeontheTinySwitchDRAINpintoasafevalue.
ThesecondarywindingisrectifiedandfilteredbyD2andC4
toprovidethe5Vouput.Additionalfilteringisprovidedby
L1andC5.Theoutputvoltageisdeterminedbythesumofthe
optocouplerU2LEDforwarddrop(~1V)andZenerdiode
VR1voltage.TheresistorR2,maintainsabiascurrentthrough
theZenertoimproveitsvoltagetolerance.Fortightertolerance,
aTL431precisionreferenceICfeedbackcircuitmaybeused.
Cellular Phone Charger
TheTinySwitchiswellsuitedforapplicationsthatrequirea
constantvoltageandconstantcurrentoutput.TinySwitchis
alwayspoweredfromtheinputhigh-voltage,thereforeitdoes
notrequirebiaswindingforpower.Consequently,itsopera-
tionisnotdependentontheleveloftheoutputvoltage.This
allowsforconstantcurrentchargerdesignsthatworkdownto
zerovoltsontheoutput.
PI-2242-082898
TinySwitch
D
S
EN
BP
+ 5 V
RTN
C1
0.01 F
1 kV
C3
0.1 F
240 - 375
VDC
R1
150 k
1 W
U2
LTV817
D2
SB540
L1
10 H
C4
2700 F
6.3 V
C5
220 F
10 V
VR1
1N5229B
U1
TNY255P
C2
4700 pF
1 kV
T1
1
4
8
10
R2
68
D1
1N4937
Optional
PI-2246-082898
DC IN
120 - 375
VDC
TinySwitch
D
S
EN
BP
+
–
+ 7.5 V
RTN
C3
0.1 F
R2
1 k
VR1
1N5235B
C1
0.01 F
1 kV
R1
100
1/2 W
C2
56 pF
1 kV
D1
1N4934
L1
15 H
C5
47 F
10 V
C4
330 F
10 V
U1
TNY253P
T1
U2
SFH615-2
C6
680 pF
Y1 Safety
1
4
8
10
Optional


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