TNY278PN datasheet(12/24 Pages) POWERINT

Part #	TNY278PN

Description	Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range

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Manufacturer	POWERINT [Power Integrations, Inc.]

Direct Link	http://www.powerint.com

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12 / 24 page

12 E2/06

TNY274-280

Quick Design Checklist

As with any power supply design, all TinySwitch-III designs

should be veriﬁed on the bench to make sure that component

speciﬁcationsarenotexceededunderworstcaseconditions. The

following minimum set of tests is strongly recommended:

1. Maximum drain voltage – Verify that V

DS does not exceed

650 V at highest input voltage and peak (overload) output

power. The 50 V margin to the 700 V BV

DSS speciﬁcation

gives margin for design variation.

2. Maximumdraincurrent–Atmaximumambienttemperature,

maximum input voltage and peak output (overload) power,

verify drain current waveforms for any signs of transformer

saturation and excessive leading edge current spikes at

startup. Repeat under steady state conditions and verify that

the leading edge current spike event is below I

LIMIT(Min)at the

end of the t

LEB(Min). Under all conditions, the maximum drain

current should be below the speciﬁed absolute maximum

ratings.

3. Thermal Check – At speciﬁed maximum output power,

minimuminputvoltageandmaximumambienttemperature,

verify that the temperature speciﬁcations are not exceeded

for TinySwitch-III, transformer, output diode, and output

capacitors. Enough thermal margin should be allowed for

part-to-part variation of the R

DS(ON) of TinySwitch-III as

speciﬁedinthedatasheet. Underlowline,maximumpower,

a maximum TinySwitch-III SOURCE pin temperature of

110 °C is recommended to allow for these variations.

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TNY278PN Datasheet(PDF) 12 Page - Power Integrations, Inc.

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