LNK403-409/413-419
R13
D7
D6
R12
D1
D5
R17
D1
R5
S
D3
C13
R20
R7
S
R4
VR2
BR1
Output
Rectifier
D2
R9
Bridge Rectifier
F1
B3
R6
R18
Active Damper
MOSFET
PI-5988-060110
Figure 13. RD-193 7 W Layout Example, Bottom Layer.
Quick Design Checklist
Maximum Drain Voltage
Verify that the peak VDS does not exceed 725 V under all
operating conditions including start up and fault conditions.
Maximum Drain Current
Measure the peak drain current under all operation conditions
including start up and fault conditions. Look for signs of
transformer saturation (usually occurs at highest operating
ambient temperatures). Verify that the peak current is less that
stated for the Absolute Maximum Rating in the data sheet.
Thermal Check
At maximum output power, both minimum and maximum line
voltage and ambient temperature; verify that temperature
specifications are not exceeded for the LinkSwitch-PH,
transformer, output diodes, output capacitors and drain clamp
components.
12
Rev. D 08/11
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