DAK-34 Power Integrations, DAK-34 Datasheet - Page 12

• Manufacturer Part Number: DAK-34
• Description: KIT DESIGN ACCELERATOR AC/DC PS
• Manufacturer: Power Integrations
• Series: TOPSwitch®-GXr

Specifications of DAK-34

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 30W
• Voltage - Output: 12V
• Current - Output: 2.5A
• Voltage - Input: 85 ~ 265VAC
• Regulator Topology: Flyback
• Frequency - Switching: 132kHz
• Board Type: Bare (Unpopulated) and Fully Populated
• Utilized Ic / Part: TOP245
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 596-1004

7.4
7.5
7.6
For information on the vendors used to source the transformers used on this board,
please visit the Power Integrations' Web site at the URL below and select “Engineering
Prototype Boards”.
http://www.powerint.com/componentsuppliers.htm
Bifilar Bias Winding
Secondary Winding
Bobbin Preparation
Core Preparation
Basic Insulation
Basic Insulation
12 V Quadrifilar
Primary Margin
Final Assembly
Pins Side
Transformer Build Diagram
Transformer Construction
Transformer Sources
Outer Wrap
Primary
Power Integrations
Tel: [phone] Fax: [phone]
www.powerint.com
Margin
Pull Pin 8 on bobbin [2] to provide polarization. Bobbin pinout is shown
below.
Apply 1.5 mm wide margin to pin side of bobbin using item [5]. Match
height of primary and bias windings. Margin tape is needed to meet safety
spacing from primary winding to core and core to secondary pins.
Start at Pin 3. Wind 30 turns of item [3] in approximately 1 layer. Bring
finish lead back to start. Wind remaining 28 primary turns, finish on Pin 1.
Note: This “Z” winding technique significantly lowers primary capacitance
to reduce no-load power consumption.
Use two layers of item [6] for basic insulation.
Starting at Pin 5, wind 5 bifilar turns of item [3]. Spread turns evenly
across bobbin. Finish at Pin 4.
Use one layer of item [7] for basic insulation.
Start at Pins 9 and 10. Wind 6 quadrifilar turns of item [4] (about 1.2
layers). Spread turns evenly across bobbin. Finish on Pins 6 and 7.
Wrap windings with 3 layers of tape [item [7].
Wrap bottom of one E core [1] with 2 layers of tape [7] as shown.
Assemble and secure core halves so that the tape wrapped E core is at
the bottom of the transformer. Varnish impregnate (item [8]).
Figure 5 – EP-34 Transformer Build Diagram.
Page 12 of 28
Secondary
Primary
Bias