AN2521 datasheet(30/33 Pages) STMICROELECTRONICS

30 / 33 page

Transformer specification

AN2521

30/33

Transformer specification

8.1

General description and characteristics

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Application type: consumer, home appliance

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Transformer type: open

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Winding type: layer

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Coil former: horizontal type, 9+9 pins

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Max. temp. rise: 45 °C

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Max. operating ambient temp.: 60 °C

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Mains insulation: acc. with EN60950

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Unit finishing: varnishing

8.2

Electrical characteristics

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Converter topology: flyback, CCM/DCM mode

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Core type: EER34 - PC47

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Min. operating frequency: -

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Typical operating freq: 60 kHz

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Primary inductance: 550 µH 10% @1 kHz - 0.25 V (see Note 1)

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Leakage inductance: 17 µH max

@ 100 kHz - 0.25 V (see Note 1 - Note 2)

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Max. peak primary current: 2.65 Apk

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RMS primary current: 0.78 Arms

Note:

Measured between pins 1-3

Measured between pins 1-3 with all secondary windings shorted

8.3

Electrical diagram and winding characteristics

Figure 33.

Electrical diagram

AUX

10-11

15-16

+12V

PRIM. A

PRIM. B

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