RDK-268 Power Integrations, RDK-268 Datasheet - Page 10

• Manufacturer Part Number: RDK-268
• Description: REFERENCE DESIGN LINKSWITCH-PL
• Manufacturer: Power Integrations
• Series: LinkSwitch®-PLr

Specifications of RDK-268

• Mfg Application Notes: LinkSwitch-PL Family AppNote
• Design Resources: RDR-268
• Current - Output / Channel: 366mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 2.5 V ~ 3.5 V
• Voltage - Input: 85 ~ 265VAC
• Utilized Ic / Part: LNK454DG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 596-1423

Rev. A 11/01/10
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.
Maximum Drain Voltage
Verify that the peak V
operating conditions including start-up and fault conditions.
Figure 13. RD-251 PCB Bottom View.
Figure 12. RD-251 PCB Top View.
Quick Design Checklist
10
LNK454/456-458/460
Bulk Capacitor
U1
U1
DS
does not exceed 700 V under all
Bulk Capacitor
Primary and Secondary
Connection Between
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.
Copper Heat Sink Area
Transformer
Transformer
Current Loop
Switching
(Primary)
Current Loop
(Secondary)
Switching
www.powerint.com
Output Filter
PI-6213-102810
PI-6212-102810
Capacitor