RDK-251 Power Integrations, RDK-251 Datasheet - Page 19

• Manufacturer Part Number: RDK-251
• Description: KIT REF DESIGN FOR LNK457D
• Manufacturer: Power Integrations
• Series: LinkSwitch®-PLr

Specifications of RDK-251

• Current - Output / Channel: 350mA
• Outputs And Type: 1, Isolated
• Voltage - Output: 12 ~ 18 V
• Features: Dimmable
• Voltage - Input: 90 ~ 265VAC
• Utilized Ic / Part: LNK457D
• Output Voltage: 12 V
• Input / Supply Voltage (max): 265 VAC
• Input / Supply Voltage (min): 90 VAC
• Duty Cycle (max): 39.9 %
• Mounting Style: Through Hole
• Output Current: 350 mA
• Output Power: 5 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 596-1345

8.5 Transformer Construction
Page 19 of 60
Preparation
Secondary
Secondary
Insulation
Insulation
2
Insulation
1
Winding
Primary
nd
st
Finish
WD1
WD2
WD3
Half of
Half of
Place bobbin on the mandrel such that primary on the left and secondary on the
right. Winding direction is clock-wise direction.
Start at pin 7, wind 10 bifilar turns of wire item [3] from right to left, and terminate at
pin 3.
1 layer of tape item [5].
Start at pin 2, wind 130 turns of wire item [4] in 3 layers: 44T+43T+43T, place 2
layers of tape item [5] between layers, see fig.7 above, and terminate at pin 1.
1 layer of tape item [5].
Start at pin 3, wind 10 bifilar turns of wire item [3] from left to right, and terminate at
pin 6.
2 layers of tape item [5].
Grind core halves to get 660 H assemble with tape.
Varnish.
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