Engineering Prototype Report

EPR-00015

Page 8 of 24

7.0 Transformer – T1

7.1 Transformer drawing

Electrical Specifications:

Electrical Strength

60Hz 1 minute, from Pins 1-4 to Pins 5-10

3000 VAC

Creepage

Between Pins 1-4 and Pins 5-10

6 mm (Min.)

Primary Inductance

Pins 1,2, all other windings open, measured at 44KHz

3676

mH, ±10%

Resonant Frequency

Pins 1,2, all other windings open

500 KHz (Min.)

Primary Leakage Inductance

Pins 1,2, with Pins 5-10 shorted, measured at 44KHz

300

mH (Max.)

Transformer Construction:

Shield

Start at Pin 1. Wind 53 turns of item [3] in 1 layer. Finish on Pin 3.

Primary

Start at Pin 2. Wind 223 turns of item [3] in 4 layers. Finish on Pin 1.

Secondary Winding

Start at Pin 10. Wind 49 turns of item [4]. Finish on Pin 9.

Final Assembly

Cores, Item [1], glued with a mixture of glass beads, item [5], 5% by weight, and

JAC133 epoxy, item [6]. (Contact Power Integrations for further details on

epoxy-glass bead construction method)

Materials:

Item

Description

[1]

2

[2]

Bobbin: 10 pin EE16, Ying Chin YC1607 or equiv.

[3]

Magnet Wire: #36 AWG Heavy Nyleze

[4]

Magnet Wire: #28 AWG Triple insulated

[5]

Glass beads, DIA=0.249mm available from MO-SCI Corp.

Telephone: +1 573 364 2338. Fax: +1 573 364 9589

[6]

Epoxy, JAC133 (or equivalent) available from Jungdo Chemical Company, Ltd. South

Korea Telephone: +82 2 856 0391 Fax: +82 2 867 1685

WDG#2

223T

#36 AWG

2

1

WDG #3

49T

28AWG Triple Insulated

10

9

WDG#1

53T

#36 AWG

1

3

Pins Side

Secondary

Primary

1

2

9

10

Shield

3

1