LNK454VG View Datasheet(PDF) - Power Integrations, Inc
Part Name
Description
MFG CO.
LNK454VG
Power Integrations, Inc
'LNK454VG' PDF : 20 Pages View PDF
LNK454/456-458/460
Secondary Side Connections
The output rectifier and output filter capacitor should be as
close as possible. The transformer output return pin should
have a short trace to the return side of the output filter
capacitor. These currents should not flow through the primary
side source pin currents. The primary side source pin and
secondary side return should be connected with a short trace.
Quick Design Checklist
Maximum Drain Voltage
Verify that the peak VDS does not exceed 700 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 high ambient
temperatures). Verify that the peak current is less than stated in
the Absolute Maximum Ratings section.
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-PL,
transformer, output diodes, output capacitors and drain clamp
components.
Switching
Current Loop
(Primary)
U1
Figure 12. RD-251 PCB Top View.
Bulk Capacitor
Transformer
Copper Heat Sink Area
Output Filter
Capacitor
PI-6212-102810
Bulk Capacitor
Connection Between
Primary and Secondary
Switching
Current Loop
(Secondary)
Transformer
U1
Figure 13. RD-251 PCB Bottom View.
10
Rev. A 11/01/10
PI-6213-102810
www.powerint.com
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