TNY175PN 데이터 시트보기 (PDF) - Power Integrations, Inc

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TNY175PN

TinySwitch-LT Family Energy Efficient, Offline Switcher with Enhanced Flexibility and Extended Power Range®

Power Integrations, Inc 

pollution degree environment, then an optional 390 kΩ resistor

should be added from EN pin to SOURCE pin to ensure that

the parasitic leakage current into the EN pin is low.

Note that typical values for surface insulation resistance (SIR)

where no-clean flux has been applied according to the suppliers’

guidelines are >>10 MΩ and do not cause this issue.

Quick Design Checklist

As with any power supply design, all TinySwitch-LT 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 the worst case VDS

does not exceed 650 V at highest input voltage and peak

(overload) output power.

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-LT, transformer, output diode, and output

capacitors. Enough thermal margin should be allowed for

part-to-part variation of the RDS(ON) of TinySwitch-LT as

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

a maximum TinySwitch-LT SOURCE pin temperature of

110 °C is recommended to allow for these variations.

TNY174-180

11 A

08/07

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