DER-34

13W Integrated Digital TV PSU

April 1, 2004

Page 9 of 19

Power Integrations

Tel: +1 408 414 9660 Fax: +1 408 414 9760

www.powerint.com

6.4

Transformer Build Diagram

Figure 4 – Transformer Build Diagram

6.5

Winding Instructions

Primary

Start at pin 3. Wind 36 turns of item [3] from left to right in a single layer.

Continue from right to left with 35 further turns. Wind tightly and uniformly

across entire width of bobbin. Terminate on pin 1.

Insulation

Apply 1 layer of tape item [5] for mechanical fixing

Bias Winding

Start at pin 5. Wind 9 tri-filar turns of item [3] from left to right in a single layer.

Finish on pin 2.

Insulation

Apply 3 layers of tape item [5] for mechanical fixing

3V3, 5V and 9V

Windings

Start at pin 6. Wind 2 quadrafilar turns of item [4] and terminate on pin 5.

Continue with 1 further bifilar turn of item [4] and terminate on pin 7. Finish

with 2 further bifilar turns of item [4] and terminate on pin 8. These three

windings should occupy a single layer

Outer Insulation

3 Layers of tape [5] for insulation.

Core Assembly

Assemble and secure core halves. Item [1]

Final Varnish

Dip varnish uniformly in item [6]

NOTE: Spreading the 3V, 5V, and 9V windings across the layer, may produce better

cross-regulation.

6

5

7

8

3

1

5

2

Primary

Bias

GND

3V3 WINDING

5V WINDING

9V WINDING