TNY274PG Ver la hoja de datos (PDF) - Power Integrations, Inc

Número de pieza

componentes Descripción

Fabricante

TNY274PG

Enhanced/ Energy Efficient/ Low Power Off-line Switcher

Power Integrations, Inc 

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

specifications are not exceeded under worst case conditions. The

following minimum set of tests is strongly recommended:

1. Maximum drain voltage – Verify that VDS does not exceed

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

power. The 50 V margin to the 700 V BVDSS specification

gives margin for design variation.

2. Maximum drain current –At maximum ambient temperature,

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 ILIMIT(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,

minimum input voltage and maximum ambient temperature,

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 RDS(ON) of TinySwitch-III as

specified in the data sheet. Under low line, maximum power,

a maximum TinySwitch-III SOURCE pin temperature of

110 °C is recommended to allow for these variations.

12 E

2/06

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