TNY255P datasheet(2/18 Pages) POWERINT

Part #	TNY255P

Description	Energy Efficient, Low Power Off-line Switchers

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Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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2 / 18 page

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

1

4

2

3

SOURCE

BYPASS

P Package (DIP-8)

G Package (SMD-8)

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