AN4248 datasheet(18/46 Pages) STMICROELECTRONICS

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Transformer specifications

AN4248

18/46

DocID024214 Rev 1

Transformer specifications

10.1

General description and characteristics

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Application type: consumer, home appliance

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Transformer type: open

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Coil former: horizontal type, 6+6 pins

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Max. temp. rise: 45 ºC

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Max. operating ambient temperature: 50 ºC

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Mains insulation: in acc. with EN60950

10.2

Electrical characteristics

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Converter topology: QR flyback

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Core type: ETD34, N87 or equivalent

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Typical operating frequency: 100 kHz

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Primary inductance: 500

μH±10% at 1 kHz-0.25 V (a)

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Leakage inductance: 5

μH Max at 100 kHz-0.25 V (b)

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Measured between pins 3-1

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Measured between pins 3-1 with secondary windings shorted

10.3

Winding details

Note:

Secondary windings are wound between primary 1st half and primary 2nd half layers.

Secondary windings A and B are in parallel.

Table 2.

Pins

Winding

RMS current

Number of turns

Wire gauge

3-2

Primary 1st Half

0.9 Arms

4XAWG27

9-7

Secondary-A

2.3 Arms

6XAWG22

10-8

Secondary-B

2.3 Arms

6XAWG22

2-1

Primary 1st half

0.9 Arms

4XAWG27

6-5

Auxiliary

0.05 Arms

1XAWG32

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