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TNY253P Datasheet(PDF) 7 Page - Power Integrations, Inc.

Part # TNY253P
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.

TNY253P Datasheet(HTML) 7 Page - Power Integrations, Inc.

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TNY253/254/255
7
Rev E
02/12
Figure 11. 3.6 W Constant Voltage-Constant Current Cellular Phone Charger Circuit.
Figure11showsa5.2V,3.6Wcellularphonechargercircuit
thatusestheTNY254andprovidesconstantvoltageandconstant
currentoutputoveranuniversalinput(85to265VAC)range.
TheACinputisrectifiedandfilteredbyD1-D4,C1andC2
tocreateahigh-voltageDCbusconnectedtoT1inserieswith
thehigh-voltageMOSFETinsidetheTNY254.Theinductor
L1formsaπ-filterinconjunctionwithC1andC2.Theresistor
R1dampsresonancesintheinductorL1.Thelowfrequencyof
operationofTNY254(44kHz)allowsuseofthesimpleπ-filter
describedaboveincombinationwithasingleY1-capacitorC8
tomeetworldwideconductedEMIstandards.ThediodeD6,
capacitorC4andresistorR2comprisetheclampcircuitthat
limitstheturn-offvoltagespikeontheTinySwitchDRAINpin
toasafevalue.Thesecondarywindingisrectifiedandfiltered
byD5andC5toprovidethe5.2Voutput.Additionalfiltering
isprovidedbyL2andC6.Theoutputvoltageisdetermined
bythesumoftheoptocouplerU2LEDforwarddrop(~1V)
andZenerdiodeVR1voltage.TheresistorR8,maintainsa
biascurrentthroughtheZenertoimproveitsvoltagetolerance.
AsimpleconstantcurrentcircuitisimplementedusingtheV
BE
oftransistorQ1tosensethevoltageacrossthecurrentsense
resistorR4,whichcanbemadeupofoneormoreresistorsto
Figure 12. 0.5 W Open Loop AC Adapter Circuit.
PI-2244-082898
TinySwitch
D
S
EN
BP
+ 5.2 V
RTN
D1
1N4005
C1
6.8 F
400 V
Fusible
RF1
10
C3
0.1 F
85 - 265
VAC
L1
560 H
D2
1N4005
D3
1N4005
D4
1N4005
R2
100 k
1 W
U2
LTV817
D5
FR201
L2
3.3 H
C5
220 F
25 V
C2
4.7 F
400 V
C6
220 F
16 V
R7
100
R3
22
R4
1
1 W
R9
47
Q1
2N3904
R8
820
VR1
1N5230B
4.7 V
C8
2.2 nF
Y1 Safety
U1
TNY254P
C4
2200 pF
D6
1N4937
R6
0.82
1/2 W
T1
R1
1.2 k
1
2
5
10
R5
18
1/8 W
PI-2190-031501
TinySwitch
D
S
EN
BP
+ 9 V
RTN
D1
1N4004
C1
2.2 F
200 V
Fusible
RF1
1.8
C4
68 pF
1 KV
115 VAC
± 15%
R2
100
D2
1N4004
C3
0.1 F
D3
1N3934
C6
100 F
16V
C2
2.2 F
200 V
VR1
1N5239B
C5
2.2 nF
Y1 Safety
U1
TNY253P
T1
1
5
6
10


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