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TNY253P Datasheet(PDF) 2 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) 2 Page - Power Integrations, Inc.

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Rev E
02/12
TNY253/254/255
2
Figure 2. Functional Block Diagram.
Figure 3. Pin Configuration.
Pin Functional Description
DRAIN (D) Pin:
PowerMOSFETdrainconnection.Providesinternaloperating
currentforbothstart-upandsteady-stateoperation.
BYPASS (BP) Pin:
Connectionpointforanexternalbypasscapacitorfortheinter-
nallygenerated5.8Vsupply.Bypasspinisnotintendedfor
sourcingsupplycurrenttoexternalcircuitry.
ENABLE (EN) Pin:
ThepowerMOSFETswitchingcanbeterminatedbypulling
thispinlow.TheI-Vcharacteristicofthispinisequivalentto
avoltagesourceofapproximately1.5Vwithasourcecurrent
clampof50µA.
SOURCE (S) Pin:
PowerMOSFETsourceconnection.Primaryreturn.
TinySwitch Functional Description
TinySwitchisintendedforlowpoweroff-lineapplications.It
combinesahigh-voltagepowerMOSFETswitchwithapower
supplycontrollerinonedevice.UnlikeaconventionalPWM
(Pulse Width Modulator) controller, the TinySwitch uses a
simpleON/OFFcontroltoregulatetheoutputvoltage.
The TinySwitch controller consists of an Oscillator, Enable
(SenseandLogic)circuit,5.8VRegulator,Undervoltagecircuit,
HystereticOverTemperatureProtection,CurrentLimitcircuit,
LeadingEdgeBlanking,anda700VpowerMOSFET.Figure
2showsafunctionalblockdiagramwiththemostimportant
features.
Oscillator
Theoscillatorfrequencyisinternallysetat44kHz(130kHz
fortheTNY255).ThetwosignalsofinterestaretheMaxi-
mumDutyCyclesignal(D
MAX)whichrunsattypically67%
dutycycleandtheClocksignalthatindicatesthebeginningof
eachcycle.Whencyclesareskipped(seebelow),theoscilla-
torfrequencydoubles(exceptforTNY255whichremainsat
130kHz).ThisincreasesthesamplingrateattheENABLE
pinforfasterloopresponse.
Enable (Sense and Logic)
TheENABLEpincircuithasasourcefollowerinputstageset
at1.5V.Theinputcurrentisclampedbyacurrentsourceset
at50µAwith10µAhysteresis.Theoutputoftheenablesense
PI-2197-061898
CLOCK
OSCILLATOR
5.8 V
5.1 V
SOURCE
S
R
Q
DCMAX
BYPASS
+
-
VILIMIT
LEADING
EDGE
BLANKING
THERMAL
SHUTDOWN
+
-
DRAIN
REGULATOR
5.8 V
UNDERVOLTAGE
1.5 V + VTH
ENABLE
Q
50 A
PI-2199-031501
ENABLE
8
5
7
6
DRAIN
SOURCE
SOURCE
SOURCE
1
4
2
3
SOURCE
SOURCE
BYPASS
P Package (DIP-8)
G Package (SMD-8)


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