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LNK362 Datasheet(PDF) 7 Page - Power Integrations, Inc.

Part No. LNK362
Description  Energy Effi cient, Low Power Off-Line Switcher IC
Download  16 Pages
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Maker  POWERINT [Power Integrations, Inc.]
Homepage  http://www.powerint.com
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LNK362 Datasheet(HTML) 7 Page - Power Integrations, Inc.

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LNK362-364
C
12/05
7
Optocoupler
Place the optocoupler physically close to the LinkSwitch-XT to
minimize the primary-side trace lengths. Keep the high current,
high voltage drain and clamp traces away from the optocoupler
to prevent noise pick up.
Output Diode
For best performance, the area of the loop connecting the
secondary winding, the output diode and the output filter
capacitor should be minimized. In addition, sufficient copper
area should be provided at the anode and cathode terminals
of the diode for heat sinking. A larger area is preferred at the
quiet cathode terminal. A large anode area can increase high
frequency radiated EMI.
Quick Design Checklist
As with any power supply design, all LinkSwitch-XT 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 V
DS does not exceed
650 V at the highest input voltage and peak (overload) output
power. The 50 V margin to the 700 V BV
DSS specification
gives margin for design variation, especially in Clampless
designs.
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 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,
minimum input voltage and maximum ambient temperature,
verify that the temperature specifications are not exceeded
for LinkSwitch-XT, transformer, output diode and output
capacitors. Enough thermal margin should be allowed for
part-to-part variation of the R
DS(ON) of LinkSwitch-XT as
specified in the data sheet. Under low line, maximum power,
a maximum LinkSwitch-XT SOURCE pin temperature of
105 °C is recommended to allow for these variations.
Design Tools
Up-to-date information on design tools can be found at the
Power Integrations web site: www.powerint.com.


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