DER-34 datasheet(8/19 Pages) POWERINT

8 / 19 page

DER-34

13W Integrated Digital TV PSU

April 1, 2004

Page 8 of 19

Power Integrations

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

www.powerint.com

Transformer Specification

6.1

Electrical Diagram

PRIMARY

71 TURNS

0.32mm HEAVY NYLEZE

PRIMARY

9 TURNS

0.32mm TRI-FILAR HEAVY NYLEZE

3V3 WINDING

2 TURNS QUADRAFILAR

0.4mm TRIPLE INSULATED WIRE

5V WINDING

1 TURN BIFILAR

0.4mm TRIPLE INSULATED WIRE

9V WINDING

2 TURNS BIFILAR

0.4mm TRIPLE INSULATED WIRE

Figure 3 –Transformer Electrical Diagram

6.2

Electrical Specifications

Electrical Strength

1 second, 60 Hz, from pins 1-5 to pins 6-10

3000 VAC

Primary Inductance

Pins 1-4, all other windings open.

Measured at 132 kHz, 1 VRMS

1.5mH

+15%

Resonant Frequency

Pin 1-4, all other windings open

600 kHz (Min.)

Primary Leakage Inductance

Pins 1-4, with pins 6-10 shorted.

Measured at 132 kHz, 1 VRMS

µH (Max.)

6.3

Materials

Item

Description

[1]

Core: EF20/10/6, 3C85 or Equivalent, Gapped for AL of 311 nH/T

[2]

Bobbin: EF20, 10 Pins

[3]

Magnet Wire: 0.32mm (#28 AWG)

[4]

Triple Insulated Wire : 0.4mm (#26 AWG)

[5]

Tape: 3M 1298 Polyester Film, 12 mm wide

[6]

Varnish

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