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LNK353 Datasheet(PDF) 6 Page - Power Integrations, Inc.

Part No. LNK353
Description  Enhanced, Energy Efficient, 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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LNK353 Datasheet(HTML) 6 Page - Power Integrations, Inc.

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LNK353/354
F
2/05
6
of the diode for heatsinking. 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-HF designs
should be verified on the bench to make sure that component
specificationsarenotexceededunderworst-caseconditions.The
following minimum set of tests is strongly recommended:
1. Maximum drain voltage – Verify that V
DS does not exceed
675Vatthehighestinputvoltageandpeak(overload)output
power.
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
Figure 6. Recommended Printed Circuit Layout for LinkSwitch-HF in a Flyback Converter Configuration.
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 LinkSwitch-HF, transformer, output diode, and output
capacitors. Enough thermal margin should be allowed for
part-to-part variation of the R
DS(ON) of LinkSwitch-HF as
specifiedinthedatasheet.Underlowline,maximumpower,
a maximum LinkSwitch-HF SOURCE pin temperature of
100 °C is recommended to allow for these variations.
Design Tools
Up-to-date information on design tools can be found at the
Power Integrations website: www.powerint.com.
+
HV DC
Input
PI-3890-102704
Input Filter
Capacitor
CBP
-
DC
Out
Output Filter
Capacitor
Y1-
Capacitor
Maximize hatched copper
areas (
) for optimum
heatsinking
TOP VIEW
D
S
S
BP
FB
S
S
LinkSwitch-HF
+
-
Opto-
coupler
PRI
SEC
T
r
a
n
s
f
o
r
m
e
r


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