RDK-83 Power Integrations, RDK-83 Datasheet - Page 13

• Manufacturer Part Number: RDK-83
• Description: KIT DESIGN REF LINKSWITCH LP
• Manufacturer: Power Integrations
• Series: LinkSwitch®-LPr

Specifications of RDK-83

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 1.6W
• Voltage - Output: 7.7V
• Current - Output: 210mA
• Voltage - Input: 85 ~ 265VAC
• Regulator Topology: Flyback
• Frequency - Switching: 66kHz
• Board Type: Bare (Unpopulated) and Fully Populated
• Utilized Ic / Part: LNK562, LNK563, LNK564
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 596-1128

7.4 Transformer Build Diagram
7.5 Transformer Construction
Bobbin orientation is such that primary pins are on the left hand side of the winding spindle
Page 13 of 36
Secondary
WD1
Cancellation and
Bias Winding
Insulation
WD #2
Primary Winding
Insulation
WD #3
Shield Winding
Insulation
WD #4
Secondary Winding
Outer insulation
Gap Core
Core Assembly and
trim flying leads
Varnish
WD #4
Pin 2
Pin 3
Pin 4
Pin 1
Pin 1
Primary pin side of the bobbin oriented to the left hand side. Temporarily
start at pin 7. Wind 29 bifilar turns of item [3] from right to left. Wind with
tight tension evenly across the bobbin. Terminate finish on pin 4. Take
the end of the winding that was started on pin 7 and terminate it on pin 3.
1 Layer of tape [6] for insulation.
Start at Pin 2. Wind 58 turns of item [3] from left to right. Then wind 59
turns on the next layer from right to left. Wind 59 turns from left to right
on the third layer. Wind with tight tension evenly across the bobbin.
Bring the wire across the bobbin and terminate the finish on pin 1.
Use one layer of tape [6] for basic insulation.
Temporarily start at Pin 7. Wind 15 bifilar turns of item [4]. Wind from
right to left with tight tension across the entire bobbin width. Terminate on
pin 1. Cut the wire from Pin 7 and leave it unconnected.
Use three layers of tape [6] for basic insulation.
Temporarily start at Pin 7 (allow 1” of wire at the start for the flying lead).
Wind 17 turns of item [5] from right to left with tight tension. Allow 1” of
wire at the finish for the flying lead, at the right side of bobbin. Remove
the start from pin 7 and mark. Exit start at right hand side of the bobbin.
Wrap windings with three layers of tape [6].
Gap core such that the inductance between pins 1 & 2 is 3.5 mH ±10%.
The gap is approximately 0.2 mm.
Assemble and secure the core halves. Trim flying leads to 0.65”±0.05”.
Tin leads 0.15”±0.05”. Cut bobbin pins 5,6,7 and 8.
Dip varnish assembly with item [7].
Figure 6 – Transformer Build Diagram.
Tel: [phone] Fax: [phone]
Tape
Tape
Tape
Tape
NC
FLYING LEAD (MARKED)
FLYING LEAD
Cancellation
Power Integrations
www.powerint.com
Primary
WD #1
WD #2
WD #3
Shield