lnk362 Power Integrations, Inc., lnk362 Datasheet - Page 7

• Manufacturer Part Number: lnk362
• Description: Energy Ef?cient, Low Power Off-line Switcher Ic
• Manufacturer: Power Integrations, Inc.

Figure 7. Recommended Printed Circuit Layout for LinkSwitch-XT using D Package in a Flyback Converter Confi guration.
capacitor should be minimized. In addition, suffi cient 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 verifi ed on the bench to make sure that component
specifi cations are not exceeded under worst-case conditions. The
following minimum set of tests is strongly recommended:
1. Maximum drain voltage – Verify that V
2. Maximum drain current – At maximum ambient temperature,
650 V at the highest input voltage and peak (overload) output
power. The 50 V margin to the 700 V BV
gives margin for design variation, especially in Clampless
designs.
maximum input voltage and peak output (overload) power,
verify drain current waveforms for any signs of transformer
TOP VIEW
Output Filter
Capacitor
Capacitor
Y1-
m
T
a
n
s
o
e
r
f
r
r
+
DS
DSS
does not exceed
OUT
DC
specifi cation
FB
BP
D
-
coupler
Opto-
S
S
S
S
3. Thermal Check – At specifi ed maximum output power,
Design Tools
Up-to-date information on design tools can be found at the
Power Integrations web site: www.powerint.com.
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
t
should be below the specifi ed absolute maximum ratings.
minimum input voltage and maximum ambient temperature,
verify that the temperature specifi cations 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
specifi ed 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.
LEB(MIN)
Maximize hatched copper
areas (
heatsinking
. Under all conditions, the maximum drain current
C
BP
-
HV DC
INPUT
+
) for optimum
Input Filter
Capacitor
LNK362-364
DS(ON)
LIMIT(MIN)
of LinkSwitch-XT as
at the end of the
PI-4585-021607
Rev. D 02/07
2-7
7